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42 <div class="section" id="authenticated-encryption-with-associated-data-aead">
43<span id="aead"></span><h1>Authenticated encryption with associated data (AEAD)</h1>
44<div class="section" id="aead-algorithms">
45<span id="id1"></span><h2>AEAD algorithms</h2>
46<div class="section" id="PSA_ALG_CCM">
47<span id="c.PSA_ALG_CCM"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_CCM</span></code> (macro)</h3>
48<p>The CCM authenticated encryption algorithm.</p>
49<pre class="literal-block">
50#define <a class="reference internal" href="#c.PSA_ALG_CCM" title="PSA_ALG_CCM">PSA_ALG_CCM</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x05500100)
51</pre>
52<p>The underlying block cipher is determined by the key type.</p>
53</div>
54<div class="section" id="PSA_ALG_GCM">
55<span id="c.PSA_ALG_GCM"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_GCM</span></code> (macro)</h3>
56<p>The GCM authenticated encryption algorithm.</p>
57<pre class="literal-block">
58#define <a class="reference internal" href="#c.PSA_ALG_GCM" title="PSA_ALG_GCM">PSA_ALG_GCM</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x05500200)
59</pre>
60<p>The underlying block cipher is determined by the key type.</p>
61</div>
62<div class="section" id="PSA_ALG_CHACHA20_POLY1305">
63<span id="c.PSA_ALG_CHACHA20_POLY1305"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_CHACHA20_POLY1305</span></code> (macro)</h3>
64<p>The Chacha20-Poly1305 AEAD algorithm.</p>
65<pre class="literal-block">
66#define <a class="reference internal" href="#c.PSA_ALG_CHACHA20_POLY1305" title="PSA_ALG_CHACHA20_POLY1305">PSA_ALG_CHACHA20_POLY1305</a> ((<a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x05100500)
67</pre>
68<p>The ChaCha20_Poly1305 construction is defined in <a class="reference external" href="https://tools.ietf.org/html/rfc7539.html">RFC 7539</a>.</p>
69<p>Variants of this algorithm are defined by the length of the nonce:</p>
70<ul class="simple">
71<li>Implementations must support a 12-byte nonce, as defined in <a class="reference external" href="https://tools.ietf.org/html/rfc7539.html">RFC 7539</a>.</li>
72<li>Implementations can optionally support an 8-byte nonce, the original variant.</li>
73<li>It is recommended that implementations do not support other sizes of nonce.</li>
74</ul>
75<p>Implementations must support 16-byte tags. It is recommended that truncated tag sizes are rejected.</p>
76</div>
77<div class="section" id="PSA_ALG_AEAD_WITH_SHORTENED_TAG">
78<span id="c.PSA_ALG_AEAD_WITH_SHORTENED_TAG"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_AEAD_WITH_SHORTENED_TAG</span></code> (macro)</h3>
79<p>Macro to build a AEAD algorithm with a shortened tag.</p>
80<pre class="literal-block">
81#define <a class="reference internal" href="#c.PSA_ALG_AEAD_WITH_SHORTENED_TAG" title="PSA_ALG_AEAD_WITH_SHORTENED_TAG">PSA_ALG_AEAD_WITH_SHORTENED_TAG</a>(aead_alg, tag_length) \
82 <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
83</pre>
84<p class="rubric">Parameters</p>
85<dl class="docutils">
86<dt> <code class="docutils literal"><span class="pre">aead_alg</span></code></dt>
87<dd>An AEAD algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a> such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
88<dt> <code class="docutils literal"><span class="pre">tag_length</span></code></dt>
89<dd>Desired length of the authentication tag in bytes.</dd>
90</dl>
91<p class="rubric">Returns</p>
92<p>The corresponding AEAD algorithm with the specified tag length.</p>
93<p>Unspecified if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported AEAD algorithm or if <code class="docutils literal"><span class="pre">tag_length</span></code> is not valid for the specified AEAD algorithm.</p>
94<p class="rubric">Description</p>
95<p>An AEAD algorithm with a shortened tag is similar to the corresponding AEAD algorithm, but has an authentication tag that consists of fewer bytes. Depending on the algorithm, the tag length might affect the calculation of the ciphertext.</p>
96<p>The AEAD algorithm with a default length tag can be recovered using <a class="reference internal" href="#c.PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG" title="PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG()</span></code></a>.</p>
97</div>
98</div>
99<div class="section" id="single-part-aead-functions">
100<h2>Single-part AEAD functions</h2>
101<div class="section" id="psa_aead_encrypt">
102<span id="c.psa_aead_encrypt"></span><h3><code class="docutils literal"><span class="pre">psa_aead_encrypt</span></code> (function)</h3>
103<p>Process an authenticated encryption operation.</p>
104<pre class="literal-block">
105<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_encrypt" title="psa_aead_encrypt">psa_aead_encrypt</a>(<a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
106 <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg,
107 const uint8_t * nonce,
108 size_t nonce_length,
109 const uint8_t * additional_data,
110 size_t additional_data_length,
111 const uint8_t * plaintext,
112 size_t plaintext_length,
113 uint8_t * ciphertext,
114 size_t ciphertext_size,
115 size_t * ciphertext_length);
116</pre>
117<p class="rubric">Parameters</p>
118<dl class="docutils">
119<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
120<dd>Identifier of the key to use for the operation.
121It must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_ENCRYPT" title="PSA_KEY_USAGE_ENCRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_ENCRYPT</span></code></a>.</dd>
122<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
123<dd>The AEAD algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
124<dt> <code class="docutils literal"><span class="pre">nonce</span></code></dt>
125<dd>Nonce or IV to use.</dd>
126<dt> <code class="docutils literal"><span class="pre">nonce_length</span></code></dt>
127<dd>Size of the <code class="docutils literal"><span class="pre">nonce</span></code> buffer in bytes. This must be appropriate for the selected algorithm. The default nonce size is <a class="reference internal" href="#c.PSA_AEAD_NONCE_LENGTH" title="PSA_AEAD_NONCE_LENGTH"><code class="docutils literal"><span class="pre">PSA_AEAD_NONCE_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of <code class="docutils literal"><span class="pre">key</span></code>.</dd>
128<dt> <code class="docutils literal"><span class="pre">additional_data</span></code></dt>
129<dd>Additional data that will be authenticated but not encrypted.</dd>
130<dt> <code class="docutils literal"><span class="pre">additional_data_length</span></code></dt>
131<dd>Size of <code class="docutils literal"><span class="pre">additional_data</span></code> in bytes.</dd>
132<dt> <code class="docutils literal"><span class="pre">plaintext</span></code></dt>
133<dd>Data that will be authenticated and encrypted.</dd>
134<dt> <code class="docutils literal"><span class="pre">plaintext_length</span></code></dt>
135<dd>Size of <code class="docutils literal"><span class="pre">plaintext</span></code> in bytes.</dd>
136<dt> <code class="docutils literal"><span class="pre">ciphertext</span></code></dt>
137<dd>Output buffer for the authenticated and encrypted data. The additional data is not part of this output. For algorithms where the encrypted data and the authentication tag are defined as separate outputs, the authentication tag is appended to the encrypted data.</dd>
138<dt> <code class="docutils literal"><span class="pre">ciphertext_size</span></code></dt>
139<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">ciphertext</span></code> buffer in bytes. This must be appropriate for the selected algorithm and key:</p>
140<ul class="last simple">
141<li>A sufficient output size is <a class="reference internal" href="#c.PSA_AEAD_ENCRYPT_OUTPUT_SIZE" title="PSA_AEAD_ENCRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">plaintext_length</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of <code class="docutils literal"><span class="pre">key</span></code>.</li>
142<li><a class="reference internal" href="#c.PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE" title="PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">plaintext_length</span></code><code class="docutils literal"><span class="pre">)</span></code> evaluates to the maximum ciphertext size of any supported AEAD encryption.</li>
143</ul>
144</dd>
145<dt> <code class="docutils literal"><span class="pre">ciphertext_length</span></code></dt>
146<dd>On success, the size of the output in the <code class="docutils literal"><span class="pre">ciphertext</span></code> buffer.</dd>
147</dl>
148<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
149<dl class="docutils">
150<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
151<dd>Success.</dd>
152<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
153<dd></dd>
154<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
155<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_ENCRYPT" title="PSA_KEY_USAGE_ENCRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_ENCRYPT</span></code></a> flag, or it does not permit the requested algorithm.</dd>
156<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
157<dd><code class="docutils literal"><span class="pre">key</span></code> is not compatible with <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
158<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
159<dd><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not an AEAD algorithm.</dd>
160<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
161<dd></dd>
162<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
163<dd><code class="docutils literal"><span class="pre">ciphertext_size</span></code> is too small. <a class="reference internal" href="#c.PSA_AEAD_ENCRYPT_OUTPUT_SIZE" title="PSA_AEAD_ENCRYPT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE" title="PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE()</span></code></a> can be used to determine the required buffer size.</dd>
164<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
165<dd></dd>
166<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
167<dd></dd>
168<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
169<dd></dd>
170<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
171<dd></dd>
172<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
173<dd></dd>
174<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
175<dd></dd>
176<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
177<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
178</dl>
179</div>
180<div class="section" id="psa_aead_decrypt">
181<span id="c.psa_aead_decrypt"></span><h3><code class="docutils literal"><span class="pre">psa_aead_decrypt</span></code> (function)</h3>
182<p>Process an authenticated decryption operation.</p>
183<pre class="literal-block">
184<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_decrypt" title="psa_aead_decrypt">psa_aead_decrypt</a>(<a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
185 <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg,
186 const uint8_t * nonce,
187 size_t nonce_length,
188 const uint8_t * additional_data,
189 size_t additional_data_length,
190 const uint8_t * ciphertext,
191 size_t ciphertext_length,
192 uint8_t * plaintext,
193 size_t plaintext_size,
194 size_t * plaintext_length);
195</pre>
196<p class="rubric">Parameters</p>
197<dl class="docutils">
198<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
199<dd>Identifier of the key to use for the operation.
200It must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_DECRYPT" title="PSA_KEY_USAGE_DECRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_DECRYPT</span></code></a>.</dd>
201<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
202<dd>The AEAD algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
203<dt> <code class="docutils literal"><span class="pre">nonce</span></code></dt>
204<dd>Nonce or IV to use.</dd>
205<dt> <code class="docutils literal"><span class="pre">nonce_length</span></code></dt>
206<dd>Size of the <code class="docutils literal"><span class="pre">nonce</span></code> buffer in bytes. This must be appropriate for the selected algorithm. The default nonce size is <a class="reference internal" href="#c.PSA_AEAD_NONCE_LENGTH" title="PSA_AEAD_NONCE_LENGTH"><code class="docutils literal"><span class="pre">PSA_AEAD_NONCE_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of <code class="docutils literal"><span class="pre">key</span></code>.</dd>
207<dt> <code class="docutils literal"><span class="pre">additional_data</span></code></dt>
208<dd>Additional data that has been authenticated but not encrypted.</dd>
209<dt> <code class="docutils literal"><span class="pre">additional_data_length</span></code></dt>
210<dd>Size of <code class="docutils literal"><span class="pre">additional_data</span></code> in bytes.</dd>
211<dt> <code class="docutils literal"><span class="pre">ciphertext</span></code></dt>
212<dd>Data that has been authenticated and encrypted. For algorithms where the encrypted data and the authentication tag are defined as separate inputs, the buffer must contain the encrypted data followed by the authentication tag.</dd>
213<dt> <code class="docutils literal"><span class="pre">ciphertext_length</span></code></dt>
214<dd>Size of <code class="docutils literal"><span class="pre">ciphertext</span></code> in bytes.</dd>
215<dt> <code class="docutils literal"><span class="pre">plaintext</span></code></dt>
216<dd>Output buffer for the decrypted data.</dd>
217<dt> <code class="docutils literal"><span class="pre">plaintext_size</span></code></dt>
218<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">plaintext</span></code> buffer in bytes. This must be appropriate for the selected algorithm and key:</p>
219<ul class="last simple">
220<li>A sufficient output size is <a class="reference internal" href="#c.PSA_AEAD_DECRYPT_OUTPUT_SIZE" title="PSA_AEAD_DECRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">ciphertext_length</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of <code class="docutils literal"><span class="pre">key</span></code>.</li>
221<li><a class="reference internal" href="#c.PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE" title="PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">ciphertext_length</span></code><code class="docutils literal"><span class="pre">)</span></code> evaluates to the maximum plaintext size of any supported AEAD decryption.</li>
222</ul>
223</dd>
224<dt> <code class="docutils literal"><span class="pre">plaintext_length</span></code></dt>
225<dd>On success, the size of the output in the <code class="docutils literal"><span class="pre">plaintext</span></code> buffer.</dd>
226</dl>
227<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
228<dl class="docutils">
229<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
230<dd>Success.</dd>
231<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
232<dd></dd>
233<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_SIGNATURE" title="PSA_ERROR_INVALID_SIGNATURE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_SIGNATURE</span></code></a></dt>
234<dd>The ciphertext is not authentic.</dd>
235<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
236<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_DECRYPT" title="PSA_KEY_USAGE_DECRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_DECRYPT</span></code></a> flag, or it does not permit the requested algorithm.</dd>
237<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
238<dd><code class="docutils literal"><span class="pre">key</span></code> is not compatible with <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
239<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
240<dd><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not an AEAD algorithm.</dd>
241<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
242<dd></dd>
243<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
244<dd><code class="docutils literal"><span class="pre">plaintext_size</span></code> is too small. <a class="reference internal" href="#c.PSA_AEAD_DECRYPT_OUTPUT_SIZE" title="PSA_AEAD_DECRYPT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE" title="PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE()</span></code></a> can be used to determine the required buffer size.</dd>
245<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
246<dd></dd>
247<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
248<dd></dd>
249<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
250<dd></dd>
251<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
252<dd></dd>
253<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
254<dd></dd>
255<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
256<dd></dd>
257<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
258<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
259</dl>
260</div>
261</div>
262<div class="section" id="multi-part-aead-operations">
263<h2>Multi-part AEAD operations</h2>
264<div class="admonition warning" id="aead-multi-part-warning">
265<p class="first admonition-title">Warning</p>
266<p>When decrypting using a multi-part AEAD operation, there is no guarantee that the input or output is valid until <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a> has returned <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_SUCCESS</span></code></a>.</p>
267<p>A call to <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> or <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> returning <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_SUCCESS</span></code></a> <strong>does not</strong> indicate that the input and output is valid.</p>
268<p>Until an application calls <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a> and it has returned <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_SUCCESS</span></code></a>, the following rules apply to input and output data from a multi-part AEAD operation:</p>
269<ul class="simple">
270<li>Do not trust the input. If the application takes any action that depends on the input data, this action will need to be undone if the input turns out to be invalid.</li>
271<li>Store the output in a confidential location. In particular, the application must not copy the output to a memory or storage space which is shared.</li>
272<li>Do not trust the output. If the application takes any action that depends on the tentative decrypted data, this action will need to be undone if the input turns out to be invalid. Furthermore, if an adversary can observe that this action took place, for example, through timing, they might be able to use this fact as an oracle to decrypt any message encrypted with the same key.</li>
273</ul>
274<p class="last">An application that does not follow these rules might be vulnerable to maliciously constructed AEAD input data.</p>
275</div>
276<div class="section" id="psa_aead_operation_t">
277<span id="c.psa_aead_operation_t"></span><h3><code class="docutils literal"><span class="pre">psa_aead_operation_t</span></code> (type)</h3>
278<p>The type of the state object for multi-part AEAD operations.</p>
279<pre class="literal-block">
280typedef <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-type"><span class="std std-ref">/* implementation-defined type */</span></a></em> <a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a>;
281</pre>
282<p>Before calling any function on an AEAD operation object, the application must initialize it by any of the following means:</p>
283<ul>
284<li><p class="first">Set the object to all-bits-zero, for example:</p>
285<pre class="literal-block">
286<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> operation;
287memset(&amp;operation, 0, sizeof(operation));
288</pre>
289</li>
290<li><p class="first">Initialize the object to logical zero values by declaring the object as static or global without an explicit initializer, for example:</p>
291<pre class="literal-block">
292static <a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> operation;
293</pre>
294</li>
295<li><p class="first">Initialize the object to the initializer <a class="reference internal" href="#c.PSA_AEAD_OPERATION_INIT" title="PSA_AEAD_OPERATION_INIT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_OPERATION_INIT</span></code></a>, for example:</p>
296<pre class="literal-block">
297<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> operation = <a class="reference internal" href="#c.PSA_AEAD_OPERATION_INIT" title="PSA_AEAD_OPERATION_INIT">PSA_AEAD_OPERATION_INIT</a>;
298</pre>
299</li>
300<li><p class="first">Assign the result of the function <a class="reference internal" href="#c.psa_aead_operation_init" title="psa_aead_operation_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_operation_init()</span></code></a> to the object, for example:</p>
301<pre class="literal-block">
302<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> operation;
303operation = <a class="reference internal" href="#c.psa_aead_operation_init" title="psa_aead_operation_init">psa_aead_operation_init</a>();
304</pre>
305</li>
306</ul>
307<p>This is an implementation-defined type. Applications that make assumptions about the content of this object will result in in implementation-specific behavior, and are non-portable.</p>
308</div>
309<div class="section" id="PSA_AEAD_OPERATION_INIT">
310<span id="c.PSA_AEAD_OPERATION_INIT"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_OPERATION_INIT</span></code> (macro)</h3>
311<p>This macro returns a suitable initializer for an AEAD operation object of type <a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_aead_operation_t</span></code></a>.</p>
312<pre class="literal-block">
313#define <a class="reference internal" href="#c.PSA_AEAD_OPERATION_INIT" title="PSA_AEAD_OPERATION_INIT">PSA_AEAD_OPERATION_INIT</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
314</pre>
315</div>
316<div class="section" id="psa_aead_operation_init">
317<span id="c.psa_aead_operation_init"></span><h3><code class="docutils literal"><span class="pre">psa_aead_operation_init</span></code> (function)</h3>
318<p>Return an initial value for an AEAD operation object.</p>
319<pre class="literal-block">
320<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> <a class="reference internal" href="#c.psa_aead_operation_init" title="psa_aead_operation_init">psa_aead_operation_init</a>(void);
321</pre>
322<p class="rubric">Returns: <a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t"><code class="docutils literal"><span class="pre">psa_aead_operation_t</span></code></a></p>
323</div>
324<div class="section" id="psa_aead_encrypt_setup">
325<span id="c.psa_aead_encrypt_setup"></span><h3><code class="docutils literal"><span class="pre">psa_aead_encrypt_setup</span></code> (function)</h3>
326<p>Set the key for a multi-part authenticated encryption operation.</p>
327<pre class="literal-block">
328<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup">psa_aead_encrypt_setup</a>(<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> * operation,
329 <a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
330 <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg);
331</pre>
332<p class="rubric">Parameters</p>
333<dl class="docutils">
334<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
335<dd>The operation object to set up. It must have been initialized as per the documentation for <a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_aead_operation_t</span></code></a> and not yet in use.</dd>
336<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
337<dd>Identifier of the key to use for the operation. It must remain valid until the operation terminates.
338It must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_ENCRYPT" title="PSA_KEY_USAGE_ENCRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_ENCRYPT</span></code></a>.</dd>
339<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
340<dd>The AEAD algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
341</dl>
342<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
343<dl class="docutils">
344<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
345<dd>Success.</dd>
346<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
347<dd>The operation state is not valid: it must be inactive.</dd>
348<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
349<dd></dd>
350<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
351<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_ENCRYPT" title="PSA_KEY_USAGE_ENCRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_ENCRYPT</span></code></a> flag, or it does not permit the requested algorithm.</dd>
352<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
353<dd><code class="docutils literal"><span class="pre">key</span></code> is not compatible with <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
354<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
355<dd><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not an AEAD algorithm.</dd>
356<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
357<dd></dd>
358<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
359<dd></dd>
360<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
361<dd></dd>
362<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
363<dd></dd>
364<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
365<dd></dd>
366<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
367<dd></dd>
368<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
369<dd></dd>
370<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
371<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
372</dl>
373<p class="rubric">Description</p>
374<p>The sequence of operations to encrypt a message with authentication is as follows:</p>
375<ol class="arabic simple">
376<li>Allocate an operation object which will be passed to all the functions listed here.</li>
377<li>Initialize the operation object with one of the methods described in the documentation for <a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_aead_operation_t</span></code></a>, e.g. <a class="reference internal" href="#c.PSA_AEAD_OPERATION_INIT" title="PSA_AEAD_OPERATION_INIT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_OPERATION_INIT</span></code></a>.</li>
378<li>Call <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt_setup()</span></code></a> to specify the algorithm and key.</li>
379<li>If needed, call <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a> to specify the length of the inputs to the subsequent calls to <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> and <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a>. See the documentation of <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a> for details.</li>
380<li>Call either <a class="reference internal" href="#c.psa_aead_generate_nonce" title="psa_aead_generate_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_generate_nonce()</span></code></a> or <a class="reference internal" href="#c.psa_aead_set_nonce" title="psa_aead_set_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_nonce()</span></code></a> to generate or set the nonce. It is recommended to use <a class="reference internal" href="#c.psa_aead_generate_nonce" title="psa_aead_generate_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_generate_nonce()</span></code></a> unless the protocol being implemented requires a specific nonce value.</li>
381<li>Call <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> zero, one or more times, passing a fragment of the non-encrypted additional authenticated data each time.</li>
382<li>Call <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> zero, one or more times, passing a fragment of the message to encrypt each time.</li>
383<li>Call <a class="reference internal" href="#c.psa_aead_finish" title="psa_aead_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_finish()</span></code></a>.</li>
384</ol>
385<p>If an error occurs at any step after a call to <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt_setup()</span></code></a>, the operation will need to be reset by a call to <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>. The application can call <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a> at any time after the operation has been initialized.</p>
386<p>After a successful call to <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt_setup()</span></code></a>, the application must eventually terminate the operation. The following events terminate an operation:</p>
387<ul class="simple">
388<li>A successful call to <a class="reference internal" href="#c.psa_aead_finish" title="psa_aead_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_finish()</span></code></a>.</li>
389<li>A call to <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>.</li>
390</ul>
391</div>
392<div class="section" id="psa_aead_decrypt_setup">
393<span id="c.psa_aead_decrypt_setup"></span><h3><code class="docutils literal"><span class="pre">psa_aead_decrypt_setup</span></code> (function)</h3>
394<p>Set the key for a multi-part authenticated decryption operation.</p>
395<pre class="literal-block">
396<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_decrypt_setup" title="psa_aead_decrypt_setup">psa_aead_decrypt_setup</a>(<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> * operation,
397 <a class="reference internal" href="../keys/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
398 <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg);
399</pre>
400<p class="rubric">Parameters</p>
401<dl class="docutils">
402<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
403<dd>The operation object to set up. It must have been initialized as per the documentation for <a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_aead_operation_t</span></code></a> and not yet in use.</dd>
404<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
405<dd>Identifier of the key to use for the operation. It must remain valid until the operation terminates.
406It must allow the usage <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_DECRYPT" title="PSA_KEY_USAGE_DECRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_DECRYPT</span></code></a>.</dd>
407<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
408<dd>The AEAD algorithm to compute (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
409</dl>
410<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
411<dl class="docutils">
412<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
413<dd>Success.</dd>
414<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
415<dd>The operation state is not valid: it must be inactive.</dd>
416<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_HANDLE" title="PSA_ERROR_INVALID_HANDLE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_HANDLE</span></code></a></dt>
417<dd></dd>
418<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_PERMITTED" title="PSA_ERROR_NOT_PERMITTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_PERMITTED</span></code></a></dt>
419<dd>The key does not have the <a class="reference internal" href="../keys/usage.html#c.PSA_KEY_USAGE_DECRYPT" title="PSA_KEY_USAGE_DECRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_USAGE_DECRYPT</span></code></a> flag, or it does not permit the requested algorithm.</dd>
420<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
421<dd><code class="docutils literal"><span class="pre">key</span></code> is not compatible with <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
422<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_NOT_SUPPORTED" title="PSA_ERROR_NOT_SUPPORTED"><code class="docutils literal"><span class="pre">PSA_ERROR_NOT_SUPPORTED</span></code></a></dt>
423<dd><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not an AEAD algorithm.</dd>
424<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
425<dd></dd>
426<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
427<dd></dd>
428<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
429<dd></dd>
430<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
431<dd></dd>
432<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
433<dd></dd>
434<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
435<dd></dd>
436<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
437<dd></dd>
438<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
439<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
440</dl>
441<p class="rubric">Description</p>
442<p>The sequence of operations to decrypt a message with authentication is as follows:</p>
443<ol class="arabic simple">
444<li>Allocate an operation object which will be passed to all the functions listed here.</li>
445<li>Initialize the operation object with one of the methods described in the documentation for <a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_aead_operation_t</span></code></a>, e.g. <a class="reference internal" href="#c.PSA_AEAD_OPERATION_INIT" title="PSA_AEAD_OPERATION_INIT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_OPERATION_INIT</span></code></a>.</li>
446<li>Call <a class="reference internal" href="#c.psa_aead_decrypt_setup" title="psa_aead_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt_setup()</span></code></a> to specify the algorithm and key.</li>
447<li>If needed, call <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a> to specify the length of the inputs to the subsequent calls to <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> and <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a>. See the documentation of <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a> for details.</li>
448<li>Call <a class="reference internal" href="#c.psa_aead_set_nonce" title="psa_aead_set_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_nonce()</span></code></a> with the nonce for the decryption.</li>
449<li>Call <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> zero, one or more times, passing a fragment of the non-encrypted additional authenticated data each time.</li>
450<li>Call <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> zero, one or more times, passing a fragment of the ciphertext to decrypt each time.</li>
451<li>Call <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a>.</li>
452</ol>
453<p>If an error occurs at any step after a call to <a class="reference internal" href="#c.psa_aead_decrypt_setup" title="psa_aead_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt_setup()</span></code></a>, the operation will need to be reset by a call to <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>. The application can call <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a> at any time after the operation has been initialized.</p>
454<p>After a successful call to <a class="reference internal" href="#c.psa_aead_decrypt_setup" title="psa_aead_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt_setup()</span></code></a>, the application must eventually terminate the operation. The following events terminate an operation:</p>
455<ul class="simple">
456<li>A successful call to <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a>.</li>
457<li>A call to <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>.</li>
458</ul>
459</div>
460<div class="section" id="psa_aead_generate_nonce">
461<span id="c.psa_aead_generate_nonce"></span><h3><code class="docutils literal"><span class="pre">psa_aead_generate_nonce</span></code> (function)</h3>
462<p>Generate a random nonce for an authenticated encryption operation.</p>
463<pre class="literal-block">
464<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_generate_nonce" title="psa_aead_generate_nonce">psa_aead_generate_nonce</a>(<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> * operation,
465 uint8_t * nonce,
466 size_t nonce_size,
467 size_t * nonce_length);
468</pre>
469<p class="rubric">Parameters</p>
470<dl class="docutils">
471<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
472<dd>Active AEAD operation.</dd>
473<dt> <code class="docutils literal"><span class="pre">nonce</span></code></dt>
474<dd>Buffer where the generated nonce is to be written.</dd>
475<dt> <code class="docutils literal"><span class="pre">nonce_size</span></code></dt>
476<dd>Size of the <code class="docutils literal"><span class="pre">nonce</span></code> buffer in bytes. This must be at least <a class="reference internal" href="#c.PSA_AEAD_NONCE_LENGTH" title="PSA_AEAD_NONCE_LENGTH"><code class="docutils literal"><span class="pre">PSA_AEAD_NONCE_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> and <code class="docutils literal"><span class="pre">alg</span></code> are type of key and the algorithm respectively that were used to set up the AEAD operation.</dd>
477<dt> <code class="docutils literal"><span class="pre">nonce_length</span></code></dt>
478<dd>On success, the number of bytes of the generated nonce.</dd>
479</dl>
480<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
481<dl class="docutils">
482<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
483<dd>Success.</dd>
484<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
485<dd>The operation state is not valid: it must be an active AEAD encryption operation, with no nonce set.</dd>
486<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
487<dd>The size of the <code class="docutils literal"><span class="pre">nonce</span></code> buffer is too small. <a class="reference internal" href="#c.PSA_AEAD_NONCE_LENGTH" title="PSA_AEAD_NONCE_LENGTH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_NONCE_LENGTH()</span></code></a> or <a class="reference internal" href="#c.PSA_AEAD_NONCE_MAX_SIZE" title="PSA_AEAD_NONCE_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_NONCE_MAX_SIZE</span></code></a> can be used to determine the required buffer size.</dd>
488<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
489<dd></dd>
490<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
491<dd></dd>
492<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
493<dd></dd>
494<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
495<dd></dd>
496<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
497<dd></dd>
498<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
499<dd></dd>
500<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
501<dd></dd>
502<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
503<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
504</dl>
505<p class="rubric">Description</p>
506<p>This function generates a random nonce for the authenticated encryption operation with an appropriate size for the chosen algorithm, key type and key size.</p>
507<p>The application must call <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt_setup()</span></code></a> before calling this function.</p>
508<p>If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>.</p>
509</div>
510<div class="section" id="psa_aead_set_nonce">
511<span id="c.psa_aead_set_nonce"></span><h3><code class="docutils literal"><span class="pre">psa_aead_set_nonce</span></code> (function)</h3>
512<p>Set the nonce for an authenticated encryption or decryption operation.</p>
513<pre class="literal-block">
514<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_set_nonce" title="psa_aead_set_nonce">psa_aead_set_nonce</a>(<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> * operation,
515 const uint8_t * nonce,
516 size_t nonce_length);
517</pre>
518<p class="rubric">Parameters</p>
519<dl class="docutils">
520<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
521<dd>Active AEAD operation.</dd>
522<dt> <code class="docutils literal"><span class="pre">nonce</span></code></dt>
523<dd>Buffer containing the nonce to use.</dd>
524<dt> <code class="docutils literal"><span class="pre">nonce_length</span></code></dt>
525<dd>Size of the nonce in bytes. This must be a valid nonce size for the chosen algorithm. The default nonce size is <a class="reference internal" href="#c.PSA_AEAD_NONCE_LENGTH" title="PSA_AEAD_NONCE_LENGTH"><code class="docutils literal"><span class="pre">PSA_AEAD_NONCE_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> and <code class="docutils literal"><span class="pre">alg</span></code> are type of key and the algorithm respectively that were used to set up the AEAD operation.</dd>
526</dl>
527<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
528<dl class="docutils">
529<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
530<dd>Success.</dd>
531<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
532<dd>The operation state is not valid: it must be active, with no nonce set.</dd>
533<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
534<dd>The size of <code class="docutils literal"><span class="pre">nonce</span></code> is not acceptable for the chosen algorithm.</dd>
535<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
536<dd></dd>
537<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
538<dd></dd>
539<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
540<dd></dd>
541<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
542<dd></dd>
543<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
544<dd></dd>
545<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
546<dd></dd>
547<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
548<dd></dd>
549<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
550<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
551</dl>
552<p class="rubric">Description</p>
553<p>This function sets the nonce for the authenticated encryption or decryption operation.</p>
554<p>The application must call <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt_setup()</span></code></a> or <a class="reference internal" href="#c.psa_aead_decrypt_setup" title="psa_aead_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt_setup()</span></code></a> before calling this function.</p>
555<p>If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>.</p>
556<div class="admonition note">
557<p class="first admonition-title">Note</p>
558<p class="last">When encrypting, <a class="reference internal" href="#c.psa_aead_generate_nonce" title="psa_aead_generate_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_generate_nonce()</span></code></a> is recommended instead of using this function, unless implementing a protocol that requires a non-random IV.</p>
559</div>
560</div>
561<div class="section" id="psa_aead_set_lengths">
562<span id="c.psa_aead_set_lengths"></span><h3><code class="docutils literal"><span class="pre">psa_aead_set_lengths</span></code> (function)</h3>
563<p>Declare the lengths of the message and additional data for AEAD.</p>
564<pre class="literal-block">
565<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths">psa_aead_set_lengths</a>(<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> * operation,
566 size_t ad_length,
567 size_t plaintext_length);
568</pre>
569<p class="rubric">Parameters</p>
570<dl class="docutils">
571<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
572<dd>Active AEAD operation.</dd>
573<dt> <code class="docutils literal"><span class="pre">ad_length</span></code></dt>
574<dd>Size of the non-encrypted additional authenticated data in bytes.</dd>
575<dt> <code class="docutils literal"><span class="pre">plaintext_length</span></code></dt>
576<dd>Size of the plaintext to encrypt in bytes.</dd>
577</dl>
578<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
579<dl class="docutils">
580<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
581<dd>Success.</dd>
582<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
583<dd>The operation state is not valid: it must be active, and <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> and <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> must not have been called yet.</dd>
584<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
585<dd>At least one of the lengths is not acceptable for the chosen algorithm.</dd>
586<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
587<dd></dd>
588<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
589<dd></dd>
590<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
591<dd></dd>
592<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
593<dd></dd>
594<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
595<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
596</dl>
597<p class="rubric">Description</p>
598<p>The application must call this function before calling <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> or <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> if the algorithm for the operation requires it. If the algorithm does not require it, calling this function is optional, but if this function is called then the implementation must enforce the lengths.</p>
599<p>This function can be called before or after setting the nonce with <a class="reference internal" href="#c.psa_aead_set_nonce" title="psa_aead_set_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_nonce()</span></code></a> or <a class="reference internal" href="#c.psa_aead_generate_nonce" title="psa_aead_generate_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_generate_nonce()</span></code></a>.</p>
600<ul class="simple">
601<li>For <a class="reference internal" href="#c.PSA_ALG_CCM" title="PSA_ALG_CCM"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_CCM</span></code></a>, calling this function is required.</li>
602<li>For the other AEAD algorithms defined in this specification, calling this function is not required.</li>
603<li>For vendor-defined algorithm, refer to the vendor documentation.</li>
604</ul>
605<p>If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>.</p>
606</div>
607<div class="section" id="psa_aead_update_ad">
608<span id="c.psa_aead_update_ad"></span><h3><code class="docutils literal"><span class="pre">psa_aead_update_ad</span></code> (function)</h3>
609<p>Pass additional data to an active AEAD operation.</p>
610<pre class="literal-block">
611<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad">psa_aead_update_ad</a>(<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> * operation,
612 const uint8_t * input,
613 size_t input_length);
614</pre>
615<p class="rubric">Parameters</p>
616<dl class="docutils">
617<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
618<dd>Active AEAD operation.</dd>
619<dt> <code class="docutils literal"><span class="pre">input</span></code></dt>
620<dd>Buffer containing the fragment of additional data.</dd>
621<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
622<dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd>
623</dl>
624<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
625<dl class="docutils">
626<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
627<dd><p class="first">Success.</p>
628<div class="last admonition warning">
629<p class="first admonition-title">Warning</p>
630<p>When decrypting, do not trust the input until <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a> succeeds.</p>
631<p class="last">See the <a class="reference internal" href="#aead-multi-part-warning"><span class="std std-ref">detailed warning</span></a>.</p>
632</div>
633</dd>
634<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
635<dd>The operation state is not valid: it must be active, have a nonce set, have lengths set if required by the algorithm, and <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> must not have been called yet.</dd>
636<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
637<dd>The total input length overflows the additional data length that was previously specified with <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a>.</dd>
638<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
639<dd></dd>
640<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
641<dd></dd>
642<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
643<dd></dd>
644<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
645<dd></dd>
646<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
647<dd></dd>
648<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
649<dd></dd>
650<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
651<dd></dd>
652<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
653<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
654</dl>
655<p class="rubric">Description</p>
656<p>Additional data is authenticated, but not encrypted.</p>
657<p>This function can be called multiple times to pass successive fragments of the additional data. This function must not be called after passing data to encrypt or decrypt with <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a>.</p>
658<p>The following must occur before calling this function:</p>
659<ol class="arabic simple">
660<li>Call either <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt_setup()</span></code></a> or <a class="reference internal" href="#c.psa_aead_decrypt_setup" title="psa_aead_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt_setup()</span></code></a>.</li>
661<li>Set the nonce with <a class="reference internal" href="#c.psa_aead_generate_nonce" title="psa_aead_generate_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_generate_nonce()</span></code></a> or <a class="reference internal" href="#c.psa_aead_set_nonce" title="psa_aead_set_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_nonce()</span></code></a>.</li>
662</ol>
663<p>If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>.</p>
664</div>
665<div class="section" id="psa_aead_update">
666<span id="c.psa_aead_update"></span><h3><code class="docutils literal"><span class="pre">psa_aead_update</span></code> (function)</h3>
667<p>Encrypt or decrypt a message fragment in an active AEAD operation.</p>
668<pre class="literal-block">
669<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update">psa_aead_update</a>(<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> * operation,
670 const uint8_t * input,
671 size_t input_length,
672 uint8_t * output,
673 size_t output_size,
674 size_t * output_length);
675</pre>
676<p class="rubric">Parameters</p>
677<dl class="docutils">
678<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
679<dd>Active AEAD operation.</dd>
680<dt> <code class="docutils literal"><span class="pre">input</span></code></dt>
681<dd>Buffer containing the message fragment to encrypt or decrypt.</dd>
682<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
683<dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd>
684<dt> <code class="docutils literal"><span class="pre">output</span></code></dt>
685<dd>Buffer where the output is to be written.</dd>
686<dt> <code class="docutils literal"><span class="pre">output_size</span></code></dt>
687<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">output</span></code> buffer in bytes. This must be appropriate for the selected algorithm and key:</p>
688<ul class="last simple">
689<li>A sufficient output size is <a class="reference internal" href="#c.PSA_AEAD_UPDATE_OUTPUT_SIZE" title="PSA_AEAD_UPDATE_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">input_length</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of key and <code class="docutils literal"><span class="pre">alg</span></code> is the algorithm that were used to set up the operation.</li>
690<li><a class="reference internal" href="#c.PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE" title="PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">input_length</span></code><code class="docutils literal"><span class="pre">)</span></code> evaluates to the maximum output size of any supported AEAD algorithm.</li>
691</ul>
692</dd>
693<dt> <code class="docutils literal"><span class="pre">output_length</span></code></dt>
694<dd>On success, the number of bytes that make up the returned output.</dd>
695</dl>
696<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
697<dl class="docutils">
698<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
699<dd><p class="first">Success.</p>
700<div class="last admonition warning">
701<p class="first admonition-title">Warning</p>
702<p>When decrypting, do not use the output until <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a> succeeds.</p>
703<p class="last">See the <a class="reference internal" href="#aead-multi-part-warning"><span class="std std-ref">detailed warning</span></a>.</p>
704</div>
705</dd>
706<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
707<dd>The operation state is not valid: it must be active, have a nonce set, and have lengths set if required by the algorithm.</dd>
708<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
709<dd>The size of the <code class="docutils literal"><span class="pre">output</span></code> buffer is too small. <a class="reference internal" href="#c.PSA_AEAD_UPDATE_OUTPUT_SIZE" title="PSA_AEAD_UPDATE_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE" title="PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE()</span></code></a> can be used to determine the required buffer size.</dd>
710<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
711<dd>The total length of input to <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> so far is less than the additional data length that was previously specified with <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a>.</dd>
712<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
713<dd>The total input length overflows the plaintext length that was previously specified with <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a>.</dd>
714<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
715<dd></dd>
716<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
717<dd></dd>
718<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
719<dd></dd>
720<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
721<dd></dd>
722<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
723<dd></dd>
724<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
725<dd></dd>
726<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
727<dd></dd>
728<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
729<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
730</dl>
731<p class="rubric">Description</p>
732<p>The following must occur before calling this function:</p>
733<ol class="arabic simple">
734<li>Call either <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt_setup()</span></code></a> or <a class="reference internal" href="#c.psa_aead_decrypt_setup" title="psa_aead_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt_setup()</span></code></a>. The choice of setup function determines whether this function encrypts or decrypts its input.</li>
735<li>Set the nonce with <a class="reference internal" href="#c.psa_aead_generate_nonce" title="psa_aead_generate_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_generate_nonce()</span></code></a> or <a class="reference internal" href="#c.psa_aead_set_nonce" title="psa_aead_set_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_nonce()</span></code></a>.</li>
736<li>Call <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> to pass all the additional data.</li>
737</ol>
738<p>If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>.</p>
739<p>This function does not require the input to be aligned to any particular block boundary. If the implementation can only process a whole block at a time, it must consume all the input provided, but it might delay the end of the corresponding output until a subsequent call to <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a>, <a class="reference internal" href="#c.psa_aead_finish" title="psa_aead_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_finish()</span></code></a> or <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a> provides sufficient input. The amount of data that can be delayed in this way is bounded by <a class="reference internal" href="#c.PSA_AEAD_UPDATE_OUTPUT_SIZE" title="PSA_AEAD_UPDATE_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_SIZE()</span></code></a>.</p>
740</div>
741<div class="section" id="psa_aead_finish">
742<span id="c.psa_aead_finish"></span><h3><code class="docutils literal"><span class="pre">psa_aead_finish</span></code> (function)</h3>
743<p>Finish encrypting a message in an AEAD operation.</p>
744<pre class="literal-block">
745<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_finish" title="psa_aead_finish">psa_aead_finish</a>(<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> * operation,
746 uint8_t * ciphertext,
747 size_t ciphertext_size,
748 size_t * ciphertext_length,
749 uint8_t * tag,
750 size_t tag_size,
751 size_t * tag_length);
752</pre>
753<p class="rubric">Parameters</p>
754<dl class="docutils">
755<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
756<dd>Active AEAD operation.</dd>
757<dt> <code class="docutils literal"><span class="pre">ciphertext</span></code></dt>
758<dd>Buffer where the last part of the ciphertext is to be written.</dd>
759<dt> <code class="docutils literal"><span class="pre">ciphertext_size</span></code></dt>
760<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">ciphertext</span></code> buffer in bytes. This must be appropriate for the selected algorithm and key:</p>
761<ul class="last simple">
762<li>A sufficient output size is <a class="reference internal" href="#c.PSA_AEAD_FINISH_OUTPUT_SIZE" title="PSA_AEAD_FINISH_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of key and <code class="docutils literal"><span class="pre">alg</span></code> is the algorithm that were used to set up the operation.</li>
763<li><a class="reference internal" href="#c.PSA_AEAD_FINISH_OUTPUT_MAX_SIZE" title="PSA_AEAD_FINISH_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_MAX_SIZE</span></code></a> evaluates to the maximum output size of any supported AEAD algorithm.</li>
764</ul>
765</dd>
766<dt> <code class="docutils literal"><span class="pre">ciphertext_length</span></code></dt>
767<dd>On success, the number of bytes of returned ciphertext.</dd>
768<dt> <code class="docutils literal"><span class="pre">tag</span></code></dt>
769<dd>Buffer where the authentication tag is to be written.</dd>
770<dt> <code class="docutils literal"><span class="pre">tag_size</span></code></dt>
771<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">tag</span></code> buffer in bytes.
772This must be appropriate for the selected algorithm and key:</p>
773<ul class="last simple">
774<li>The exact tag size is <a class="reference internal" href="#c.PSA_AEAD_TAG_LENGTH" title="PSA_AEAD_TAG_LENGTH"><code class="docutils literal"><span class="pre">PSA_AEAD_TAG_LENGTH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">key_bits</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> and <code class="docutils literal"><span class="pre">key_bits</span></code> are the type and bit-size of the key, and <code class="docutils literal"><span class="pre">alg</span></code> is the algorithm that were used in the call to <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt_setup()</span></code></a>.</li>
775<li><a class="reference internal" href="#c.PSA_AEAD_TAG_MAX_SIZE" title="PSA_AEAD_TAG_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_TAG_MAX_SIZE</span></code></a> evaluates to the maximum tag size of any supported AEAD algorithm.</li>
776</ul>
777</dd>
778<dt> <code class="docutils literal"><span class="pre">tag_length</span></code></dt>
779<dd>On success, the number of bytes that make up the returned tag.</dd>
780</dl>
781<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
782<dl class="docutils">
783<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
784<dd>Success.</dd>
785<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
786<dd>The operation state is not valid: it must be an active encryption operation with a nonce set.</dd>
787<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
788<dd>The size of the <code class="docutils literal"><span class="pre">ciphertext</span></code> or <code class="docutils literal"><span class="pre">tag</span></code> buffer is too small.
789<a class="reference internal" href="#c.PSA_AEAD_FINISH_OUTPUT_SIZE" title="PSA_AEAD_FINISH_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_AEAD_FINISH_OUTPUT_MAX_SIZE" title="PSA_AEAD_FINISH_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_MAX_SIZE</span></code></a> can be used to determine the required <code class="docutils literal"><span class="pre">ciphertext</span></code> buffer size.
790<a class="reference internal" href="#c.PSA_AEAD_TAG_LENGTH" title="PSA_AEAD_TAG_LENGTH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_TAG_LENGTH()</span></code></a> or <a class="reference internal" href="#c.PSA_AEAD_TAG_MAX_SIZE" title="PSA_AEAD_TAG_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_TAG_MAX_SIZE</span></code></a> can be used to determine the required <code class="docutils literal"><span class="pre">tag</span></code> buffer size.</dd>
791<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
792<dd>The total length of input to <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> so far is less than the additional data length that was previously specified with <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a>.</dd>
793<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
794<dd>The total length of input to <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> so far is less than the plaintext length that was previously specified with <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a>.</dd>
795<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
796<dd></dd>
797<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
798<dd></dd>
799<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
800<dd></dd>
801<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
802<dd></dd>
803<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
804<dd></dd>
805<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
806<dd></dd>
807<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
808<dd></dd>
809<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
810<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
811</dl>
812<p class="rubric">Description</p>
813<p>The operation must have been set up with <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt_setup()</span></code></a>.</p>
814<p>This function finishes the authentication of the additional data formed by concatenating the inputs passed to preceding calls to <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> with the plaintext formed by concatenating the inputs passed to preceding calls to <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a>.</p>
815<p>This function has two output buffers:</p>
816<ul class="simple">
817<li><code class="docutils literal"><span class="pre">ciphertext</span></code> contains trailing ciphertext that was buffered from preceding calls to <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a>.</li>
818<li><code class="docutils literal"><span class="pre">tag</span></code> contains the authentication tag.</li>
819</ul>
820<p>When this function returns successfully, the operation becomes inactive. If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>.</p>
821</div>
822<div class="section" id="psa_aead_verify">
823<span id="c.psa_aead_verify"></span><h3><code class="docutils literal"><span class="pre">psa_aead_verify</span></code> (function)</h3>
824<p>Finish authenticating and decrypting a message in an AEAD operation.</p>
825<pre class="literal-block">
826<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify">psa_aead_verify</a>(<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> * operation,
827 uint8_t * plaintext,
828 size_t plaintext_size,
829 size_t * plaintext_length,
830 const uint8_t * tag,
831 size_t tag_length);
832</pre>
833<p class="rubric">Parameters</p>
834<dl class="docutils">
835<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
836<dd>Active AEAD operation.</dd>
837<dt> <code class="docutils literal"><span class="pre">plaintext</span></code></dt>
838<dd>Buffer where the last part of the plaintext is to be written. This is the remaining data from previous calls to <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> that could not be processed until the end of the input.</dd>
839<dt> <code class="docutils literal"><span class="pre">plaintext_size</span></code></dt>
840<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">plaintext</span></code> buffer in bytes. This must be appropriate for the selected algorithm and key:</p>
841<ul class="last simple">
842<li>A sufficient output size is <a class="reference internal" href="#c.PSA_AEAD_VERIFY_OUTPUT_SIZE" title="PSA_AEAD_VERIFY_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_SIZE</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">key_type</span></code><code class="docutils literal"><span class="pre">,</span> </code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> where <code class="docutils literal"><span class="pre">key_type</span></code> is the type of key and <code class="docutils literal"><span class="pre">alg</span></code> is the algorithm that were used to set up the operation.</li>
843<li><a class="reference internal" href="#c.PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE" title="PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE</span></code></a> evaluates to the maximum output size of any supported AEAD algorithm.</li>
844</ul>
845</dd>
846<dt> <code class="docutils literal"><span class="pre">plaintext_length</span></code></dt>
847<dd>On success, the number of bytes of returned plaintext.</dd>
848<dt> <code class="docutils literal"><span class="pre">tag</span></code></dt>
849<dd>Buffer containing the authentication tag.</dd>
850<dt> <code class="docutils literal"><span class="pre">tag_length</span></code></dt>
851<dd>Size of the <code class="docutils literal"><span class="pre">tag</span></code> buffer in bytes.</dd>
852</dl>
853<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
854<dl class="docutils">
855<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
856<dd>Success.</dd>
857<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_SIGNATURE" title="PSA_ERROR_INVALID_SIGNATURE"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_SIGNATURE</span></code></a></dt>
858<dd>The calculations were successful, but the authentication tag is not correct.</dd>
859<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
860<dd>The operation state is not valid: it must be an active decryption operation with a nonce set.</dd>
861<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a></dt>
862<dd>The size of the <code class="docutils literal"><span class="pre">plaintext</span></code> buffer is too small. <a class="reference internal" href="#c.PSA_AEAD_VERIFY_OUTPUT_SIZE" title="PSA_AEAD_VERIFY_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE" title="PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE</span></code></a> can be used to determine the required buffer size.</dd>
863<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
864<dd>The total length of input to <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a> so far is less than the additional data length that was previously specified with <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a>.</dd>
865<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_ARGUMENT" title="PSA_ERROR_INVALID_ARGUMENT"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_ARGUMENT</span></code></a></dt>
866<dd>The total length of input to <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> so far is less than the plaintext length that was previously specified with <a class="reference internal" href="#c.psa_aead_set_lengths" title="psa_aead_set_lengths"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_set_lengths()</span></code></a>.</dd>
867<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_MEMORY" title="PSA_ERROR_INSUFFICIENT_MEMORY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_MEMORY</span></code></a></dt>
868<dd></dd>
869<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
870<dd></dd>
871<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
872<dd></dd>
873<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
874<dd></dd>
875<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_STORAGE_FAILURE" title="PSA_ERROR_STORAGE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_STORAGE_FAILURE</span></code></a></dt>
876<dd></dd>
877<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_CORRUPT" title="PSA_ERROR_DATA_CORRUPT"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_CORRUPT</span></code></a></dt>
878<dd></dd>
879<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_DATA_INVALID" title="PSA_ERROR_DATA_INVALID"><code class="docutils literal"><span class="pre">PSA_ERROR_DATA_INVALID</span></code></a></dt>
880<dd></dd>
881<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
882<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
883</dl>
884<p class="rubric">Description</p>
885<p>The operation must have been set up with <a class="reference internal" href="#c.psa_aead_decrypt_setup" title="psa_aead_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt_setup()</span></code></a>.</p>
886<p>This function finishes the authenticated decryption of the message components:</p>
887<ul class="simple">
888<li>The additional data consisting of the concatenation of the inputs passed to preceding calls to <a class="reference internal" href="#c.psa_aead_update_ad" title="psa_aead_update_ad"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update_ad()</span></code></a>.</li>
889<li>The ciphertext consisting of the concatenation of the inputs passed to preceding calls to <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a>.</li>
890<li>The tag passed to this function call.</li>
891</ul>
892<p>If the authentication tag is correct, this function outputs any remaining plaintext and reports success. If the authentication tag is not correct, this function returns <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_SIGNATURE" title="PSA_ERROR_INVALID_SIGNATURE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ERROR_INVALID_SIGNATURE</span></code></a>.</p>
893<p>When this function returns successfully, the operation becomes inactive. If this function returns an error status, the operation enters an error state and must be aborted by calling <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>.</p>
894<div class="admonition note">
895<p class="first admonition-title">Note</p>
896<p class="last">Implementations must make the best effort to ensure that the comparison between the actual tag and the expected tag is performed in constant time.</p>
897</div>
898</div>
899<div class="section" id="psa_aead_abort">
900<span id="c.psa_aead_abort"></span><h3><code class="docutils literal"><span class="pre">psa_aead_abort</span></code> (function)</h3>
901<p>Abort an AEAD operation.</p>
902<pre class="literal-block">
903<a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t">psa_status_t</a> <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort">psa_aead_abort</a>(<a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t">psa_aead_operation_t</a> * operation);
904</pre>
905<p class="rubric">Parameters</p>
906<dl class="docutils">
907<dt> <code class="docutils literal"><span class="pre">operation</span></code></dt>
908<dd>Initialized AEAD operation.</dd>
909</dl>
910<p class="rubric">Returns: <a class="reference internal" href="../library/status.html#c.psa_status_t" title="psa_status_t"><code class="docutils literal"><span class="pre">psa_status_t</span></code></a></p>
911<dl class="docutils">
912<dt> <a class="reference internal" href="../library/status.html#c.PSA_SUCCESS" title="PSA_SUCCESS"><code class="docutils literal"><span class="pre">PSA_SUCCESS</span></code></a></dt>
913<dd></dd>
914<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_COMMUNICATION_FAILURE" title="PSA_ERROR_COMMUNICATION_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_COMMUNICATION_FAILURE</span></code></a></dt>
915<dd></dd>
916<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_HARDWARE_FAILURE" title="PSA_ERROR_HARDWARE_FAILURE"><code class="docutils literal"><span class="pre">PSA_ERROR_HARDWARE_FAILURE</span></code></a></dt>
917<dd></dd>
918<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_CORRUPTION_DETECTED" title="PSA_ERROR_CORRUPTION_DETECTED"><code class="docutils literal"><span class="pre">PSA_ERROR_CORRUPTION_DETECTED</span></code></a></dt>
919<dd></dd>
920<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BAD_STATE" title="PSA_ERROR_BAD_STATE"><code class="docutils literal"><span class="pre">PSA_ERROR_BAD_STATE</span></code></a></dt>
921<dd>The library has not been previously initialized by <a class="reference internal" href="../library/library.html#c.psa_crypto_init" title="psa_crypto_init"><code class="xref any c c-func docutils literal"><span class="pre">psa_crypto_init()</span></code></a>. It is implementation-dependent whether a failure to initialize results in this error code.</dd>
922</dl>
923<p class="rubric">Description</p>
924<p>Aborting an operation frees all associated resources except for the <code class="docutils literal"><span class="pre">operation</span></code> object itself. Once aborted, the operation object can be reused for another operation by calling <a class="reference internal" href="#c.psa_aead_encrypt_setup" title="psa_aead_encrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt_setup()</span></code></a> or <a class="reference internal" href="#c.psa_aead_decrypt_setup" title="psa_aead_decrypt_setup"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt_setup()</span></code></a> again.</p>
925<p>This function can be called any time after the operation object has been initialized as described in <a class="reference internal" href="#c.psa_aead_operation_t" title="psa_aead_operation_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_aead_operation_t</span></code></a>.</p>
926<p>In particular, calling <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a> after the operation has been terminated by a call to <a class="reference internal" href="#c.psa_aead_abort" title="psa_aead_abort"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_abort()</span></code></a>, <a class="reference internal" href="#c.psa_aead_finish" title="psa_aead_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_finish()</span></code></a> or <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a> is safe and has no effect.</p>
927</div>
928</div>
929<div class="section" id="support-macros">
930<h2>Support macros</h2>
931<div class="section" id="PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER">
932<span id="c.PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER</span></code> (macro)</h3>
933<p>Whether the specified algorithm is an AEAD mode on a block cipher.</p>
934<pre class="literal-block">
935#define <a class="reference internal" href="#c.PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER" title="PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER">PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER</a>(alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
936</pre>
937<p class="rubric">Parameters</p>
938<dl class="docutils">
939<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
940<dd>An algorithm identifier (value of type <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t"><code class="xref any c c-type docutils literal"><span class="pre">psa_algorithm_t</span></code></a>).</dd>
941</dl>
942<p class="rubric">Returns</p>
943<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is an AEAD algorithm which is an AEAD mode based on a block cipher, <code class="docutils literal"><span class="pre">0</span></code> otherwise.</p>
944<p>This macro can return either <code class="docutils literal"><span class="pre">0</span></code> or <code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is not a supported algorithm identifier.</p>
945</div>
946<div class="section" id="PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG">
947<span id="c.PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG</span></code> (macro)</h3>
948<p>An AEAD algorithm with the default tag length.</p>
949<pre class="literal-block">
950#define <a class="reference internal" href="#c.PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG" title="PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG">PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG</a>(aead_alg) \
951 <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
952</pre>
953<p class="rubric">Parameters</p>
954<dl class="docutils">
955<dt> <code class="docutils literal"><span class="pre">aead_alg</span></code></dt>
956<dd>An AEAD algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
957</dl>
958<p class="rubric">Returns</p>
959<p>The corresponding AEAD algorithm with the default tag length for that algorithm.</p>
960<p class="rubric">Description</p>
961<p>This macro can be used to construct the AEAD algorithm with default tag length from an AEAD algorithm with a shortened tag. See also <a class="reference internal" href="#c.PSA_ALG_AEAD_WITH_SHORTENED_TAG" title="PSA_ALG_AEAD_WITH_SHORTENED_TAG"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_AEAD_WITH_SHORTENED_TAG()</span></code></a>.</p>
962</div>
963<div class="section" id="PSA_AEAD_ENCRYPT_OUTPUT_SIZE">
964<span id="c.PSA_AEAD_ENCRYPT_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_SIZE</span></code> (macro)</h3>
965<p>The maximum size of the output of <a class="reference internal" href="#c.psa_aead_encrypt" title="psa_aead_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt()</span></code></a>, in bytes.</p>
966<pre class="literal-block">
967#define <a class="reference internal" href="#c.PSA_AEAD_ENCRYPT_OUTPUT_SIZE" title="PSA_AEAD_ENCRYPT_OUTPUT_SIZE">PSA_AEAD_ENCRYPT_OUTPUT_SIZE</a>(key_type, alg, plaintext_length) \
968 <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
969</pre>
970<p class="rubric">Parameters</p>
971<dl class="docutils">
972<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
973<dd>A symmetric key type that is compatible with algorithm <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
974<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
975<dd>An AEAD algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
976<dt> <code class="docutils literal"><span class="pre">plaintext_length</span></code></dt>
977<dd>Size of the plaintext in bytes.</dd>
978</dl>
979<p class="rubric">Returns</p>
980<p>The AEAD ciphertext size for the specified key type and algorithm. If the key type or AEAD algorithm is not recognized, or the parameters are incompatible, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for a key type and AEAD algorithm that it recognizes, but does not support.</p>
981<p class="rubric">Description</p>
982<p>If the size of the ciphertext buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_aead_encrypt" title="psa_aead_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt()</span></code></a> will not fail due to an insufficient buffer size. Depending on the algorithm, the actual size of the ciphertext might be smaller.</p>
983<p>See also <a class="reference internal" href="#c.PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE" title="PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE</span></code></a>.</p>
984</div>
985<div class="section" id="PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE">
986<span id="c.PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</h3>
987<p>A sufficient output buffer size for <a class="reference internal" href="#c.psa_aead_encrypt" title="psa_aead_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt()</span></code></a>, for any of the supported key types and AEAD algorithms.</p>
988<pre class="literal-block">
989#define <a class="reference internal" href="#c.PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE" title="PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE">PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE</a>(plaintext_length) \
990 <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
991</pre>
992<p class="rubric">Parameters</p>
993<dl class="docutils">
994<dt> <code class="docutils literal"><span class="pre">plaintext_length</span></code></dt>
995<dd>Size of the plaintext in bytes.</dd>
996</dl>
997<p class="rubric">Description</p>
998<p>If the size of the ciphertext buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_aead_encrypt" title="psa_aead_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_encrypt()</span></code></a> will not fail due to an insufficient buffer size.</p>
999<p>See also <a class="reference internal" href="#c.PSA_AEAD_ENCRYPT_OUTPUT_SIZE" title="PSA_AEAD_ENCRYPT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_SIZE()</span></code></a>.</p>
1000</div>
1001<div class="section" id="PSA_AEAD_DECRYPT_OUTPUT_SIZE">
1002<span id="c.PSA_AEAD_DECRYPT_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_SIZE</span></code> (macro)</h3>
1003<p>The maximum size of the output of <a class="reference internal" href="#c.psa_aead_decrypt" title="psa_aead_decrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt()</span></code></a>, in bytes.</p>
1004<pre class="literal-block">
1005#define <a class="reference internal" href="#c.PSA_AEAD_DECRYPT_OUTPUT_SIZE" title="PSA_AEAD_DECRYPT_OUTPUT_SIZE">PSA_AEAD_DECRYPT_OUTPUT_SIZE</a>(key_type, alg, ciphertext_length) \
1006 <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
1007</pre>
1008<p class="rubric">Parameters</p>
1009<dl class="docutils">
1010<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
1011<dd>A symmetric key type that is compatible with algorithm <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
1012<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
1013<dd>An AEAD algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
1014<dt> <code class="docutils literal"><span class="pre">ciphertext_length</span></code></dt>
1015<dd>Size of the ciphertext in bytes.</dd>
1016</dl>
1017<p class="rubric">Returns</p>
1018<p>The AEAD plaintext size for the specified key type and algorithm. If the key type or AEAD algorithm is not recognized, or the parameters are incompatible, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for a key type and AEAD algorithm that it recognizes, but does not support.</p>
1019<p class="rubric">Description</p>
1020<p>If the size of the plaintext buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_aead_decrypt" title="psa_aead_decrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt()</span></code></a> will not fail due to an insufficient buffer size. Depending on the algorithm, the actual size of the plaintext might be smaller.</p>
1021<p>See also <a class="reference internal" href="#c.PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE" title="PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE</span></code></a>.</p>
1022</div>
1023<div class="section" id="PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE">
1024<span id="c.PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</h3>
1025<p>A sufficient output buffer size for <a class="reference internal" href="#c.psa_aead_decrypt" title="psa_aead_decrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt()</span></code></a>, for any of the supported key types and AEAD algorithms.</p>
1026<pre class="literal-block">
1027#define <a class="reference internal" href="#c.PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE" title="PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE">PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE</a>(ciphertext_length) \
1028 <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
1029</pre>
1030<p class="rubric">Parameters</p>
1031<dl class="docutils">
1032<dt> <code class="docutils literal"><span class="pre">ciphertext_length</span></code></dt>
1033<dd>Size of the ciphertext in bytes.</dd>
1034</dl>
1035<p class="rubric">Description</p>
1036<p>If the size of the plaintext buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_aead_decrypt" title="psa_aead_decrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_decrypt()</span></code></a> will not fail due to an insufficient buffer size.</p>
1037<p>See also <a class="reference internal" href="#c.PSA_AEAD_DECRYPT_OUTPUT_SIZE" title="PSA_AEAD_DECRYPT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_SIZE()</span></code></a>.</p>
1038</div>
1039<div class="section" id="PSA_AEAD_NONCE_LENGTH">
1040<span id="c.PSA_AEAD_NONCE_LENGTH"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_NONCE_LENGTH</span></code> (macro)</h3>
1041<p>The default nonce size for an AEAD algorithm, in bytes.</p>
1042<pre class="literal-block">
1043#define <a class="reference internal" href="#c.PSA_AEAD_NONCE_LENGTH" title="PSA_AEAD_NONCE_LENGTH">PSA_AEAD_NONCE_LENGTH</a>(key_type, alg) <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
1044</pre>
1045<p class="rubric">Parameters</p>
1046<dl class="docutils">
1047<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
1048<dd>A symmetric key type that is compatible with algorithm <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
1049<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
1050<dd>An AEAD algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
1051</dl>
1052<p class="rubric">Returns</p>
1053<p>The default nonce size for the specified key type and algorithm. If the key type or AEAD algorithm is not recognized, or the parameters are incompatible, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for a key type and AEAD algorithm that it recognizes, but does not support.</p>
1054<p class="rubric">Description</p>
1055<p>This macro can be used to allocate a buffer of sufficient size to store the nonce output from <a class="reference internal" href="#c.psa_aead_generate_nonce" title="psa_aead_generate_nonce"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_generate_nonce()</span></code></a>.</p>
1056<p>See also <a class="reference internal" href="#c.PSA_AEAD_NONCE_MAX_SIZE" title="PSA_AEAD_NONCE_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_NONCE_MAX_SIZE</span></code></a>.</p>
1057</div>
1058<div class="section" id="PSA_AEAD_NONCE_MAX_SIZE">
1059<span id="c.PSA_AEAD_NONCE_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_NONCE_MAX_SIZE</span></code> (macro)</h3>
1060<p>The maximum nonce size for all supported AEAD algorithms, in bytes.</p>
1061<pre class="literal-block">
1062#define <a class="reference internal" href="#c.PSA_AEAD_NONCE_MAX_SIZE" title="PSA_AEAD_NONCE_MAX_SIZE">PSA_AEAD_NONCE_MAX_SIZE</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
1063</pre>
1064<p>See also <a class="reference internal" href="#c.PSA_AEAD_NONCE_LENGTH" title="PSA_AEAD_NONCE_LENGTH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_NONCE_LENGTH()</span></code></a>.</p>
1065</div>
1066<div class="section" id="PSA_AEAD_UPDATE_OUTPUT_SIZE">
1067<span id="c.PSA_AEAD_UPDATE_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_SIZE</span></code> (macro)</h3>
1068<p>A sufficient output buffer size for <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a>.</p>
1069<pre class="literal-block">
1070#define <a class="reference internal" href="#c.PSA_AEAD_UPDATE_OUTPUT_SIZE" title="PSA_AEAD_UPDATE_OUTPUT_SIZE">PSA_AEAD_UPDATE_OUTPUT_SIZE</a>(key_type, alg, input_length) \
1071 <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
1072</pre>
1073<p class="rubric">Parameters</p>
1074<dl class="docutils">
1075<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
1076<dd>A symmetric key type that is compatible with algorithm <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
1077<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
1078<dd>An AEAD algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
1079<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
1080<dd>Size of the input in bytes.</dd>
1081</dl>
1082<p class="rubric">Returns</p>
1083<p>A sufficient output buffer size for the specified key type and algorithm. If the key type or AEAD algorithm is not recognized, or the parameters are incompatible, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for a key type and AEAD algorithm that it recognizes, but does not support.</p>
1084<p class="rubric">Description</p>
1085<p>If the size of the output buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> will not fail due to an insufficient buffer size. The actual size of the output might be smaller in any given call.</p>
1086<p>See also <a class="reference internal" href="#c.PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE" title="PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE</span></code></a>.</p>
1087</div>
1088<div class="section" id="PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE">
1089<span id="c.PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE</span></code> (macro)</h3>
1090<p>A sufficient output buffer size for <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a>, for any of the supported key types and AEAD algorithms.</p>
1091<pre class="literal-block">
1092#define <a class="reference internal" href="#c.PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE" title="PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE">PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE</a>(input_length) \
1093 <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
1094</pre>
1095<p class="rubric">Parameters</p>
1096<dl class="docutils">
1097<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
1098<dd>Size of the input in bytes.</dd>
1099</dl>
1100<p class="rubric">Description</p>
1101<p>If the size of the output buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_aead_update" title="psa_aead_update"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_update()</span></code></a> will not fail due to an insufficient buffer size.</p>
1102<p>See also <a class="reference internal" href="#c.PSA_AEAD_UPDATE_OUTPUT_SIZE" title="PSA_AEAD_UPDATE_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_SIZE()</span></code></a>.</p>
1103</div>
1104<div class="section" id="PSA_AEAD_FINISH_OUTPUT_SIZE">
1105<span id="c.PSA_AEAD_FINISH_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_SIZE</span></code> (macro)</h3>
1106<p>A sufficient ciphertext buffer size for <a class="reference internal" href="#c.psa_aead_finish" title="psa_aead_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_finish()</span></code></a>.</p>
1107<pre class="literal-block">
1108#define <a class="reference internal" href="#c.PSA_AEAD_FINISH_OUTPUT_SIZE" title="PSA_AEAD_FINISH_OUTPUT_SIZE">PSA_AEAD_FINISH_OUTPUT_SIZE</a>(key_type, alg) \
1109 <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
1110</pre>
1111<p class="rubric">Parameters</p>
1112<dl class="docutils">
1113<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
1114<dd>A symmetric key type that is compatible with algorithm <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
1115<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
1116<dd>An AEAD algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
1117</dl>
1118<p class="rubric">Returns</p>
1119<p>A sufficient ciphertext buffer size for the specified key type and algorithm. If the key type or AEAD algorithm is not recognized, or the parameters are incompatible, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for a key type and AEAD algorithm that it recognizes, but does not support.</p>
1120<p class="rubric">Description</p>
1121<p>If the size of the ciphertext buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_aead_finish" title="psa_aead_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_finish()</span></code></a> will not fail due to an insufficient ciphertext buffer size. The actual size of the output might be smaller in any given call.</p>
1122<p>See also <a class="reference internal" href="#c.PSA_AEAD_FINISH_OUTPUT_MAX_SIZE" title="PSA_AEAD_FINISH_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_MAX_SIZE</span></code></a>.</p>
1123</div>
1124<div class="section" id="PSA_AEAD_FINISH_OUTPUT_MAX_SIZE">
1125<span id="c.PSA_AEAD_FINISH_OUTPUT_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_MAX_SIZE</span></code> (macro)</h3>
1126<p>A sufficient ciphertext buffer size for <a class="reference internal" href="#c.psa_aead_finish" title="psa_aead_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_finish()</span></code></a>, for any of the supported key types and AEAD algorithms.</p>
1127<pre class="literal-block">
1128#define <a class="reference internal" href="#c.PSA_AEAD_FINISH_OUTPUT_MAX_SIZE" title="PSA_AEAD_FINISH_OUTPUT_MAX_SIZE">PSA_AEAD_FINISH_OUTPUT_MAX_SIZE</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
1129</pre>
1130<p>See also <a class="reference internal" href="#c.PSA_AEAD_FINISH_OUTPUT_SIZE" title="PSA_AEAD_FINISH_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_SIZE()</span></code></a>.</p>
1131</div>
1132<div class="section" id="PSA_AEAD_TAG_LENGTH">
1133<span id="c.PSA_AEAD_TAG_LENGTH"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_TAG_LENGTH</span></code> (macro)</h3>
1134<p>The length of a tag for an AEAD algorithm, in bytes.</p>
1135<pre class="literal-block">
1136#define <a class="reference internal" href="#c.PSA_AEAD_TAG_LENGTH" title="PSA_AEAD_TAG_LENGTH">PSA_AEAD_TAG_LENGTH</a>(key_type, key_bits, alg) \
1137 <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
1138</pre>
1139<p class="rubric">Parameters</p>
1140<dl class="docutils">
1141<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
1142<dd>The type of the AEAD key.</dd>
1143<dt> <code class="docutils literal"><span class="pre">key_bits</span></code></dt>
1144<dd>The size of the AEAD key in bits.</dd>
1145<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
1146<dd>An AEAD algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
1147</dl>
1148<p class="rubric">Returns</p>
1149<p>The tag length for the specified algorithm and key.
1150If the AEAD algorithm does not have an identified tag that can be distinguished from the rest of the ciphertext, return <code class="docutils literal"><span class="pre">0</span></code>. If the AEAD algorithm is not recognized, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for an AEAD algorithm that it recognizes, but does not support.</p>
1151<p class="rubric">Description</p>
1152<p>This macro can be used to allocate a buffer of sufficient size to store the tag output from <a class="reference internal" href="#c.psa_aead_finish" title="psa_aead_finish"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_finish()</span></code></a>.</p>
1153<p>See also <a class="reference internal" href="#c.PSA_AEAD_TAG_MAX_SIZE" title="PSA_AEAD_TAG_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_TAG_MAX_SIZE</span></code></a>.</p>
1154</div>
1155<div class="section" id="PSA_AEAD_TAG_MAX_SIZE">
1156<span id="c.PSA_AEAD_TAG_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_TAG_MAX_SIZE</span></code> (macro)</h3>
1157<p>The maximum tag size for all supported AEAD algorithms, in bytes.</p>
1158<pre class="literal-block">
1159#define <a class="reference internal" href="#c.PSA_AEAD_TAG_MAX_SIZE" title="PSA_AEAD_TAG_MAX_SIZE">PSA_AEAD_TAG_MAX_SIZE</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
1160</pre>
1161<p>See also <a class="reference internal" href="#c.PSA_AEAD_TAG_LENGTH" title="PSA_AEAD_TAG_LENGTH"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_TAG_LENGTH()</span></code></a>.</p>
1162</div>
1163<div class="section" id="PSA_AEAD_VERIFY_OUTPUT_SIZE">
1164<span id="c.PSA_AEAD_VERIFY_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_SIZE</span></code> (macro)</h3>
1165<p>A sufficient plaintext buffer size for <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a>.</p>
1166<pre class="literal-block">
1167#define <a class="reference internal" href="#c.PSA_AEAD_VERIFY_OUTPUT_SIZE" title="PSA_AEAD_VERIFY_OUTPUT_SIZE">PSA_AEAD_VERIFY_OUTPUT_SIZE</a>(key_type, alg) \
1168 <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
1169</pre>
1170<p class="rubric">Parameters</p>
1171<dl class="docutils">
1172<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
1173<dd>A symmetric key type that is compatible with algorithm <code class="docutils literal"><span class="pre">alg</span></code>.</dd>
1174<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
1175<dd>An AEAD algorithm (<code class="docutils literal"><span class="pre">PSA_ALG_XXX</span></code> value such that <a class="reference internal" href="../keys/algorithms.html#c.PSA_ALG_IS_AEAD" title="PSA_ALG_IS_AEAD"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true).</dd>
1176</dl>
1177<p class="rubric">Returns</p>
1178<p>A sufficient plaintext buffer size for the specified key type and algorithm. If the key type or AEAD algorithm is not recognized, or the parameters are incompatible, return <code class="docutils literal"><span class="pre">0</span></code>. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for a key type and AEAD algorithm that it recognizes, but does not support.</p>
1179<p class="rubric">Description</p>
1180<p>If the size of the plaintext buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a> will not fail due to an insufficient plaintext buffer size. The actual size of the output might be smaller in any given call.</p>
1181<p>See also <a class="reference internal" href="#c.PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE" title="PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE</span></code></a>.</p>
1182</div>
1183<div class="section" id="PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE">
1184<span id="c.PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE</span></code> (macro)</h3>
1185<p>A sufficient plaintext buffer size for <a class="reference internal" href="#c.psa_aead_verify" title="psa_aead_verify"><code class="xref any c c-func docutils literal"><span class="pre">psa_aead_verify()</span></code></a>, for any of the supported key types and AEAD algorithms.</p>
1186<pre class="literal-block">
1187#define <a class="reference internal" href="#c.PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE" title="PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE">PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE</a> <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
1188</pre>
1189<p>See also <a class="reference internal" href="#c.PSA_AEAD_VERIFY_OUTPUT_SIZE" title="PSA_AEAD_VERIFY_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_SIZE()</span></code></a>.</p>
1190</div>
1191</div>
1192</div>
1193
1194
1195 </div>
1196 </div>
1197 </div>
1198 <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
1199 <div class="sphinxsidebarwrapper">
1200 <h3><a href="../../index.html">Table Of Contents</a></h3>
1201 <ul>
1202<li><a class="reference internal" href="#">Authenticated encryption with associated data (AEAD)</a><ul>
1203<li><a class="reference internal" href="#aead-algorithms">AEAD algorithms</a><ul>
1204<li><a class="reference internal" href="#PSA_ALG_CCM"><code class="docutils literal"><span class="pre">PSA_ALG_CCM</span></code> (macro)</a></li>
1205<li><a class="reference internal" href="#PSA_ALG_GCM"><code class="docutils literal"><span class="pre">PSA_ALG_GCM</span></code> (macro)</a></li>
1206<li><a class="reference internal" href="#PSA_ALG_CHACHA20_POLY1305"><code class="docutils literal"><span class="pre">PSA_ALG_CHACHA20_POLY1305</span></code> (macro)</a></li>
1207<li><a class="reference internal" href="#PSA_ALG_AEAD_WITH_SHORTENED_TAG"><code class="docutils literal"><span class="pre">PSA_ALG_AEAD_WITH_SHORTENED_TAG</span></code> (macro)</a></li>
1208</ul>
1209</li>
1210<li><a class="reference internal" href="#single-part-aead-functions">Single-part AEAD functions</a><ul>
1211<li><a class="reference internal" href="#psa_aead_encrypt"><code class="docutils literal"><span class="pre">psa_aead_encrypt</span></code> (function)</a></li>
1212<li><a class="reference internal" href="#psa_aead_decrypt"><code class="docutils literal"><span class="pre">psa_aead_decrypt</span></code> (function)</a></li>
1213</ul>
1214</li>
1215<li><a class="reference internal" href="#multi-part-aead-operations">Multi-part AEAD operations</a><ul>
1216<li><a class="reference internal" href="#psa_aead_operation_t"><code class="docutils literal"><span class="pre">psa_aead_operation_t</span></code> (type)</a></li>
1217<li><a class="reference internal" href="#PSA_AEAD_OPERATION_INIT"><code class="docutils literal"><span class="pre">PSA_AEAD_OPERATION_INIT</span></code> (macro)</a></li>
1218<li><a class="reference internal" href="#psa_aead_operation_init"><code class="docutils literal"><span class="pre">psa_aead_operation_init</span></code> (function)</a></li>
1219<li><a class="reference internal" href="#psa_aead_encrypt_setup"><code class="docutils literal"><span class="pre">psa_aead_encrypt_setup</span></code> (function)</a></li>
1220<li><a class="reference internal" href="#psa_aead_decrypt_setup"><code class="docutils literal"><span class="pre">psa_aead_decrypt_setup</span></code> (function)</a></li>
1221<li><a class="reference internal" href="#psa_aead_generate_nonce"><code class="docutils literal"><span class="pre">psa_aead_generate_nonce</span></code> (function)</a></li>
1222<li><a class="reference internal" href="#psa_aead_set_nonce"><code class="docutils literal"><span class="pre">psa_aead_set_nonce</span></code> (function)</a></li>
1223<li><a class="reference internal" href="#psa_aead_set_lengths"><code class="docutils literal"><span class="pre">psa_aead_set_lengths</span></code> (function)</a></li>
1224<li><a class="reference internal" href="#psa_aead_update_ad"><code class="docutils literal"><span class="pre">psa_aead_update_ad</span></code> (function)</a></li>
1225<li><a class="reference internal" href="#psa_aead_update"><code class="docutils literal"><span class="pre">psa_aead_update</span></code> (function)</a></li>
1226<li><a class="reference internal" href="#psa_aead_finish"><code class="docutils literal"><span class="pre">psa_aead_finish</span></code> (function)</a></li>
1227<li><a class="reference internal" href="#psa_aead_verify"><code class="docutils literal"><span class="pre">psa_aead_verify</span></code> (function)</a></li>
1228<li><a class="reference internal" href="#psa_aead_abort"><code class="docutils literal"><span class="pre">psa_aead_abort</span></code> (function)</a></li>
1229</ul>
1230</li>
1231<li><a class="reference internal" href="#support-macros">Support macros</a><ul>
1232<li><a class="reference internal" href="#PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER"><code class="docutils literal"><span class="pre">PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER</span></code> (macro)</a></li>
1233<li><a class="reference internal" href="#PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG"><code class="docutils literal"><span class="pre">PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG</span></code> (macro)</a></li>
1234<li><a class="reference internal" href="#PSA_AEAD_ENCRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_SIZE</span></code> (macro)</a></li>
1235<li><a class="reference internal" href="#PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
1236<li><a class="reference internal" href="#PSA_AEAD_DECRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_SIZE</span></code> (macro)</a></li>
1237<li><a class="reference internal" href="#PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
1238<li><a class="reference internal" href="#PSA_AEAD_NONCE_LENGTH"><code class="docutils literal"><span class="pre">PSA_AEAD_NONCE_LENGTH</span></code> (macro)</a></li>
1239<li><a class="reference internal" href="#PSA_AEAD_NONCE_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_NONCE_MAX_SIZE</span></code> (macro)</a></li>
1240<li><a class="reference internal" href="#PSA_AEAD_UPDATE_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_SIZE</span></code> (macro)</a></li>
1241<li><a class="reference internal" href="#PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
1242<li><a class="reference internal" href="#PSA_AEAD_FINISH_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_SIZE</span></code> (macro)</a></li>
1243<li><a class="reference internal" href="#PSA_AEAD_FINISH_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_FINISH_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
1244<li><a class="reference internal" href="#PSA_AEAD_TAG_LENGTH"><code class="docutils literal"><span class="pre">PSA_AEAD_TAG_LENGTH</span></code> (macro)</a></li>
1245<li><a class="reference internal" href="#PSA_AEAD_TAG_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_TAG_MAX_SIZE</span></code> (macro)</a></li>
1246<li><a class="reference internal" href="#PSA_AEAD_VERIFY_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_SIZE</span></code> (macro)</a></li>
1247<li><a class="reference internal" href="#PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE</span></code> (macro)</a></li>
1248</ul>
1249</li>
1250</ul>
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