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43 <div class="section" id="asymmetric-encryption">
44<span id="pke"></span><h1>10.8. Asymmetric encryption</h1>
45<p>Asymmetric encryption is provided through the functions <a class="reference internal" href="#c.psa_asymmetric_encrypt" title="psa_asymmetric_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_asymmetric_encrypt()</span></code></a> and <a class="reference internal" href="#c.psa_asymmetric_decrypt" title="psa_asymmetric_decrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_asymmetric_decrypt()</span></code></a>.</p>
46<div class="section" id="asymmetric-encryption-algorithms">
47<span id="id1"></span><h2>10.8.1. Asymmetric encryption algorithms</h2>
48<div class="section" id="PSA_ALG_RSA_PKCS1V15_CRYPT">
49<span id="c.PSA_ALG_RSA_PKCS1V15_CRYPT"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_RSA_PKCS1V15_CRYPT</span></code> (macro)</h3>
50<p>The RSA PKCS#1 v1.5 asymmetric encryption algorithm.</p>
51<pre class="literal-block">
52#define <a class="reference internal" href="#c.PSA_ALG_RSA_PKCS1V15_CRYPT" title="PSA_ALG_RSA_PKCS1V15_CRYPT">PSA_ALG_RSA_PKCS1V15_CRYPT</a> ((<a class="reference internal" href="algorithms.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x07000200)
53</pre>
54<p>This encryption scheme is defined by <span><em>PKCS #1: RSA Cryptography Specifications Version 2.2</em> <a class="reference internal" href="../../about.html#citation-rfc8017"><span class="cite">[RFC8017]</span></a></span> <a class="reference external" href="https://tools.ietf.org/html/rfc8017.html#section-7.2">§7.2</a> under the name RSAES-PKCS-v1_5.</p>
55<p class="rubric">Compatible key types</p>
56<div class="line-block">
57<div class="line"><a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_RSA_KEY_PAIR" title="PSA_KEY_TYPE_RSA_KEY_PAIR"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_TYPE_RSA_KEY_PAIR</span></code></a></div>
58<div class="line"><a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_RSA_PUBLIC_KEY" title="PSA_KEY_TYPE_RSA_PUBLIC_KEY"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_TYPE_RSA_PUBLIC_KEY</span></code></a> (asymmetric encryption only)</div>
59</div>
60</div>
61<div class="section" id="PSA_ALG_RSA_OAEP">
62<span id="c.PSA_ALG_RSA_OAEP"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_RSA_OAEP</span></code> (macro)</h3>
63<p>The RSA OAEP asymmetric encryption algorithm.</p>
64<pre class="literal-block">
65#define <a class="reference internal" href="#c.PSA_ALG_RSA_OAEP" title="PSA_ALG_RSA_OAEP">PSA_ALG_RSA_OAEP</a>(hash_alg) <em><a class="reference internal" href="../../overview/implementation.html#specification-defined-value"><span class="std std-ref">/* specification-defined value */</span></a></em>
66</pre>
67<p class="rubric">Parameters</p>
68<dl class="docutils">
69<dt> <code class="docutils literal"><span class="pre">hash_alg</span></code></dt>
70<dd>A hash algorithm: a value of type <a class="reference internal" href="algorithms.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="algorithms.html#c.PSA_ALG_IS_HASH" title="PSA_ALG_IS_HASH"><code class="docutils literal"><span class="pre">PSA_ALG_IS_HASH</span></code></a><code class="docutils literal"><span class="pre">(</span></code><code class="docutils literal"><span class="pre">hash_alg</span></code><code class="docutils literal"><span class="pre">)</span></code> is true. The hash algorithm is used for <em>MGF1</em>.</dd>
71</dl>
72<p class="rubric">Returns</p>
73<p>The corresponding RSA OAEP encryption algorithm.</p>
74<p>Unspecified if <code class="docutils literal"><span class="pre">hash_alg</span></code> is not a supported hash algorithm.</p>
75<p class="rubric">Description</p>
76<p>This encryption scheme is defined by <a class="reference internal" href="../../about.html#citation-rfc8017"><span class="cite">[RFC8017]</span></a> <a class="reference external" href="https://tools.ietf.org/html/rfc8017.html#section-7.1">§7.1</a> under the name RSAES-OAEP, with the following options:</p>
77<ul class="simple">
78<li>The mask generation function <em>MGF1</em> defined in <a class="reference internal" href="../../about.html#citation-rfc8017"><span class="cite">[RFC8017]</span></a> <a class="reference external" href="https://tools.ietf.org/html/rfc8017.html#appendix-B.2.1">Appendix B.2.1</a>.</li>
79<li>The specified hash algorithm is used to hash the label, and for the mask generation function.</li>
80</ul>
81<p class="rubric">Compatible key types</p>
82<div class="line-block">
83<div class="line"><a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_RSA_KEY_PAIR" title="PSA_KEY_TYPE_RSA_KEY_PAIR"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_TYPE_RSA_KEY_PAIR</span></code></a></div>
84<div class="line"><a class="reference internal" href="../keys/types.html#c.PSA_KEY_TYPE_RSA_PUBLIC_KEY" title="PSA_KEY_TYPE_RSA_PUBLIC_KEY"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_KEY_TYPE_RSA_PUBLIC_KEY</span></code></a> (asymmetric encryption only)</div>
85</div>
86</div>
87</div>
88<div class="section" id="asymmetric-encryption-functions">
89<h2>10.8.2. Asymmetric encryption functions</h2>
90<div class="section" id="psa_asymmetric_encrypt">
91<span id="c.psa_asymmetric_encrypt"></span><h3><code class="docutils literal"><span class="pre">psa_asymmetric_encrypt</span></code> (function)</h3>
92<p>Encrypt a short message with a public key.</p>
93<pre class="literal-block">
94<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_asymmetric_encrypt" title="psa_asymmetric_encrypt">psa_asymmetric_encrypt</a>(<a class="reference internal" href="../keys/ids.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
95 <a class="reference internal" href="algorithms.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg,
96 const uint8_t * input,
97 size_t input_length,
98 const uint8_t * salt,
99 size_t salt_length,
100 uint8_t * output,
101 size_t output_size,
102 size_t * output_length);
103</pre>
104<p class="rubric">Parameters</p>
105<dl class="docutils">
106<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
107<dd>Identifer of the key to use for the operation. It must be a public key or an asymmetric key pair.
108It must allow the usage <a class="reference internal" href="../keys/policy.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>
109<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
110<dd>The asymmetric encryption algorithm to compute: a value of type <a class="reference internal" href="algorithms.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="algorithms.html#c.PSA_ALG_IS_ASYMMETRIC_ENCRYPTION" title="PSA_ALG_IS_ASYMMETRIC_ENCRYPTION"><code class="docutils literal"><span class="pre">PSA_ALG_IS_ASYMMETRIC_ENCRYPTION</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>
111<dt> <code class="docutils literal"><span class="pre">input</span></code></dt>
112<dd>The message to encrypt.</dd>
113<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
114<dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd>
115<dt> <code class="docutils literal"><span class="pre">salt</span></code></dt>
116<dd>A salt or label, if supported by the encryption algorithm. If the algorithm does not support a salt, pass <code class="docutils literal"><span class="pre">NULL</span></code>. If the algorithm supports an optional salt, pass <code class="docutils literal"><span class="pre">NULL</span></code> to indicate that there is no salt.</dd>
117<dt> <code class="docutils literal"><span class="pre">salt_length</span></code></dt>
118<dd>Size of the <code class="docutils literal"><span class="pre">salt</span></code> buffer in bytes. If <code class="docutils literal"><span class="pre">salt</span></code> is <code class="docutils literal"><span class="pre">NULL</span></code>, pass <code class="docutils literal"><span class="pre">0</span></code>.</dd>
119<dt> <code class="docutils literal"><span class="pre">output</span></code></dt>
120<dd>Buffer where the encrypted message is to be written.</dd>
121<dt> <code class="docutils literal"><span class="pre">output_size</span></code></dt>
122<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">output</span></code> buffer in bytes.
123This must be appropriate for the selected algorithm and key:</p>
124<ul class="last simple">
125<li>The required output size is <a class="reference internal" href="#c.PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE" title="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_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">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 respectively of <code class="docutils literal"><span class="pre">key</span></code>.</li>
126<li><a class="reference internal" href="#c.PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE" title="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE</span></code></a> evaluates to the maximum output size of any supported asymmetric encryption.</li>
127</ul>
128</dd>
129<dt> <code class="docutils literal"><span class="pre">output_length</span></code></dt>
130<dd>On success, the number of bytes that make up the returned output.</dd>
131</dl>
132<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>
133<dl class="docutils">
134<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>
135<dd>Success.
136The first <code class="docutils literal"><span class="pre">(*output_length)</span></code> bytes of <code class="docutils literal"><span class="pre">output</span></code> contain the encrypted output.</dd>
137<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>
138<dd>The library requires initializing by a call to <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>.</dd>
139<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>
140<dd><code class="docutils literal"><span class="pre">key</span></code> is not a valid key identifier.</dd>
141<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>
142<dd>The key does not have the <a class="reference internal" href="../keys/policy.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>
143<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>
144<dd>The size of the <code class="docutils literal"><span class="pre">output</span></code> buffer is too small.
145<a class="reference internal" href="#c.PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE" title="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE" title="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE</span></code></a> can be used to determine a sufficient buffer size.</dd>
146<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>
147<dd><p class="first">The following conditions can result in this error:</p>
148<ul class="last simple">
149<li><code class="docutils literal"><span class="pre">alg</span></code> is not an asymmetric encryption algorithm.</li>
150<li><code class="docutils literal"><span class="pre">key</span></code> is not a public key or an asymmetric key pair, that is compatible with <code class="docutils literal"><span class="pre">alg</span></code>.</li>
151<li><code class="docutils literal"><span class="pre">input_length</span></code> is not valid for the algorithm and key type.</li>
152<li><code class="docutils literal"><span class="pre">salt_length</span></code> is not valid for the algorithm and key type.</li>
153</ul>
154</dd>
155<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>
156<dd><p class="first">The following conditions can result in this error:</p>
157<ul class="last simple">
158<li><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not an asymmetric encryption algorithm.</li>
159<li><code class="docutils literal"><span class="pre">key</span></code> is not supported for use with <code class="docutils literal"><span class="pre">alg</span></code>.</li>
160<li><code class="docutils literal"><span class="pre">input_length</span></code> or <code class="docutils literal"><span class="pre">salt_length</span></code> are too large for the implementation.</li>
161</ul>
162</dd>
163<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_ENTROPY" title="PSA_ERROR_INSUFFICIENT_ENTROPY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_ENTROPY</span></code></a></dt>
164<dd></dd>
165<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>
166<dd></dd>
167<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>
168<dd></dd>
169<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>
170<dd></dd>
171<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>
172<dd></dd>
173<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>
174<dd></dd>
175<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>
176<dd></dd>
177</dl>
178<p class="rubric">Description</p>
179<ul class="simple">
180<li>For <a class="reference internal" href="#c.PSA_ALG_RSA_PKCS1V15_CRYPT" title="PSA_ALG_RSA_PKCS1V15_CRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_RSA_PKCS1V15_CRYPT</span></code></a>, no salt is supported.</li>
181</ul>
182</div>
183<div class="section" id="psa_asymmetric_decrypt">
184<span id="c.psa_asymmetric_decrypt"></span><h3><code class="docutils literal"><span class="pre">psa_asymmetric_decrypt</span></code> (function)</h3>
185<p>Decrypt a short message with a private key.</p>
186<pre class="literal-block">
187<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_asymmetric_decrypt" title="psa_asymmetric_decrypt">psa_asymmetric_decrypt</a>(<a class="reference internal" href="../keys/ids.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key,
188 <a class="reference internal" href="algorithms.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg,
189 const uint8_t * input,
190 size_t input_length,
191 const uint8_t * salt,
192 size_t salt_length,
193 uint8_t * output,
194 size_t output_size,
195 size_t * output_length);
196</pre>
197<p class="rubric">Parameters</p>
198<dl class="docutils">
199<dt> <code class="docutils literal"><span class="pre">key</span></code></dt>
200<dd>Identifier of the key to use for the operation. It must be an asymmetric key pair.
201It must allow the usage <a class="reference internal" href="../keys/policy.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>
202<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
203<dd>The asymmetric encryption algorithm to compute: a value of type <a class="reference internal" href="algorithms.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="algorithms.html#c.PSA_ALG_IS_ASYMMETRIC_ENCRYPTION" title="PSA_ALG_IS_ASYMMETRIC_ENCRYPTION"><code class="docutils literal"><span class="pre">PSA_ALG_IS_ASYMMETRIC_ENCRYPTION</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>
204<dt> <code class="docutils literal"><span class="pre">input</span></code></dt>
205<dd>The message to decrypt.</dd>
206<dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt>
207<dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd>
208<dt> <code class="docutils literal"><span class="pre">salt</span></code></dt>
209<dd>A salt or label, if supported by the encryption algorithm. If the algorithm does not support a salt, pass <code class="docutils literal"><span class="pre">NULL</span></code>. If the algorithm supports an optional salt, pass <code class="docutils literal"><span class="pre">NULL</span></code> to indicate that there is no salt.</dd>
210<dt> <code class="docutils literal"><span class="pre">salt_length</span></code></dt>
211<dd>Size of the <code class="docutils literal"><span class="pre">salt</span></code> buffer in bytes. If <code class="docutils literal"><span class="pre">salt</span></code> is <code class="docutils literal"><span class="pre">NULL</span></code>, pass <code class="docutils literal"><span class="pre">0</span></code>.</dd>
212<dt> <code class="docutils literal"><span class="pre">output</span></code></dt>
213<dd>Buffer where the decrypted message is to be written.</dd>
214<dt> <code class="docutils literal"><span class="pre">output_size</span></code></dt>
215<dd><p class="first">Size of the <code class="docutils literal"><span class="pre">output</span></code> buffer in bytes.
216This must be appropriate for the selected algorithm and key:</p>
217<ul class="last simple">
218<li>The required output size is <a class="reference internal" href="#c.PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE" title="PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_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">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 respectively of <code class="docutils literal"><span class="pre">key</span></code>.</li>
219<li><a class="reference internal" href="#c.PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE" title="PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE</span></code></a> evaluates to the maximum output size of any supported asymmetric decryption.</li>
220</ul>
221</dd>
222<dt> <code class="docutils literal"><span class="pre">output_length</span></code></dt>
223<dd>On success, the number of bytes that make up the returned output.</dd>
224</dl>
225<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>
226<dl class="docutils">
227<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>
228<dd>Success.
229The first <code class="docutils literal"><span class="pre">(*output_length)</span></code> bytes of <code class="docutils literal"><span class="pre">output</span></code> contain the decrypted output.</dd>
230<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>
231<dd>The library requires initializing by a call to <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>.</dd>
232<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>
233<dd><code class="docutils literal"><span class="pre">key</span></code> is not a valid key identifier.</dd>
234<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>
235<dd>The key does not have the <a class="reference internal" href="../keys/policy.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>
236<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>
237<dd>The size of the <code class="docutils literal"><span class="pre">output</span></code> buffer is too small.
238<a class="reference internal" href="#c.PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE" title="PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE()</span></code></a> or <a class="reference internal" href="#c.PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE" title="PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE</span></code></a> can be used to determine a sufficient buffer size.</dd>
239<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INVALID_PADDING" title="PSA_ERROR_INVALID_PADDING"><code class="docutils literal"><span class="pre">PSA_ERROR_INVALID_PADDING</span></code></a></dt>
240<dd>The algorithm uses padding, and the input does not contain valid padding.</dd>
241<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>
242<dd><p class="first">The following conditions can result in this error:</p>
243<ul class="last simple">
244<li><code class="docutils literal"><span class="pre">alg</span></code> is not an asymmetric encryption algorithm.</li>
245<li><code class="docutils literal"><span class="pre">key</span></code> is not an asymmetric key pair, that is compatible with <code class="docutils literal"><span class="pre">alg</span></code>.</li>
246<li><code class="docutils literal"><span class="pre">input_length</span></code> is not valid for the algorithm and key type.</li>
247<li><code class="docutils literal"><span class="pre">salt_length</span></code> is not valid for the algorithm and key type.</li>
248</ul>
249</dd>
250<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>
251<dd><p class="first">The following conditions can result in this error:</p>
252<ul class="last simple">
253<li><code class="docutils literal"><span class="pre">alg</span></code> is not supported or is not an asymmetric encryption algorithm.</li>
254<li><code class="docutils literal"><span class="pre">key</span></code> is not supported for use with <code class="docutils literal"><span class="pre">alg</span></code>.</li>
255<li><code class="docutils literal"><span class="pre">input_length</span></code> or <code class="docutils literal"><span class="pre">salt_length</span></code> are too large for the implementation.</li>
256</ul>
257</dd>
258<dt> <a class="reference internal" href="../library/status.html#c.PSA_ERROR_INSUFFICIENT_ENTROPY" title="PSA_ERROR_INSUFFICIENT_ENTROPY"><code class="docutils literal"><span class="pre">PSA_ERROR_INSUFFICIENT_ENTROPY</span></code></a></dt>
259<dd></dd>
260<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>
261<dd></dd>
262<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>
263<dd></dd>
264<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>
265<dd></dd>
266<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>
267<dd></dd>
268<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>
269<dd></dd>
270<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>
271<dd></dd>
272</dl>
273<p class="rubric">Description</p>
274<ul class="simple">
275<li>For <a class="reference internal" href="#c.PSA_ALG_RSA_PKCS1V15_CRYPT" title="PSA_ALG_RSA_PKCS1V15_CRYPT"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ALG_RSA_PKCS1V15_CRYPT</span></code></a>, no salt is supported.</li>
276</ul>
277</div>
278</div>
279<div class="section" id="support-macros">
280<h2>10.8.3. Support macros</h2>
281<div class="section" id="PSA_ALG_IS_RSA_OAEP">
282<span id="c.PSA_ALG_IS_RSA_OAEP"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_IS_RSA_OAEP</span></code> (macro)</h3>
283<p>Whether the specified algorithm is an RSA OAEP encryption algorithm.</p>
284<pre class="literal-block">
285#define <a class="reference internal" href="#c.PSA_ALG_IS_RSA_OAEP" title="PSA_ALG_IS_RSA_OAEP">PSA_ALG_IS_RSA_OAEP</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>
286</pre>
287<p class="rubric">Parameters</p>
288<dl class="docutils">
289<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
290<dd>An algorithm identifier: a value of type <a class="reference internal" href="algorithms.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>
291</dl>
292<p class="rubric">Returns</p>
293<p><code class="docutils literal"><span class="pre">1</span></code> if <code class="docutils literal"><span class="pre">alg</span></code> is an RSA OAEP algorithm, <code class="docutils literal"><span class="pre">0</span></code> otherwise.</p>
294<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>
295</div>
296<div class="section" id="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE">
297<span id="c.PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE</span></code> (macro)</h3>
298<p>Sufficient output buffer size for <a class="reference internal" href="#c.psa_asymmetric_encrypt" title="psa_asymmetric_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_asymmetric_encrypt()</span></code></a>.</p>
299<pre class="literal-block">
300#define <a class="reference internal" href="#c.PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE" title="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE</a>(key_type, key_bits, alg) \
301 <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
302</pre>
303<p class="rubric">Parameters</p>
304<dl class="docutils">
305<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
306<dd>An asymmetric key type, either a key pair or a public key.</dd>
307<dt> <code class="docutils literal"><span class="pre">key_bits</span></code></dt>
308<dd>The size of the key in bits.</dd>
309<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
310<dd>An asymmetric encryption algorithm: a value of type <a class="reference internal" href="algorithms.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="algorithms.html#c.PSA_ALG_IS_ASYMMETRIC_ENCRYPTION" title="PSA_ALG_IS_ASYMMETRIC_ENCRYPTION"><code class="docutils literal"><span class="pre">PSA_ALG_IS_ASYMMETRIC_ENCRYPTION</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>
311</dl>
312<p class="rubric">Returns</p>
313<p>A sufficient output buffer size for the specified asymmetric encryption algorithm and key parameters. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for an asymmetric encryption algorithm and key parameters that it recognizes, but does not support. If the parameters are not valid, the return value is unspecified.</p>
314<p class="rubric">Description</p>
315<p>If the size of the output buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_asymmetric_encrypt" title="psa_asymmetric_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_asymmetric_encrypt()</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>
316<p>See also <a class="reference internal" href="#c.PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE" title="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE</span></code></a>.</p>
317</div>
318<div class="section" id="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE">
319<span id="c.PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</h3>
320<p>A sufficient output buffer size for <a class="reference internal" href="#c.psa_asymmetric_encrypt" title="psa_asymmetric_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_asymmetric_encrypt()</span></code></a>, for any of the supported key types and asymmetric encryption algorithms.</p>
321<pre class="literal-block">
322#define <a class="reference internal" href="#c.PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE" title="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE</a> \
323 <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
324</pre>
325<p>If the size of the output buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_asymmetric_encrypt" title="psa_asymmetric_encrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_asymmetric_encrypt()</span></code></a> will not fail due to an insufficient buffer size.</p>
326<p>See also <a class="reference internal" href="#c.PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE" title="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE()</span></code></a>.</p>
327</div>
328<div class="section" id="PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE">
329<span id="c.PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE</span></code> (macro)</h3>
330<p>Sufficient output buffer size for <a class="reference internal" href="#c.psa_asymmetric_decrypt" title="psa_asymmetric_decrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_asymmetric_decrypt()</span></code></a>.</p>
331<pre class="literal-block">
332#define <a class="reference internal" href="#c.PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE" title="PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE">PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE</a>(key_type, key_bits, alg) \
333 <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
334</pre>
335<p class="rubric">Parameters</p>
336<dl class="docutils">
337<dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt>
338<dd>An asymmetric key type, either a key pair or a public key.</dd>
339<dt> <code class="docutils literal"><span class="pre">key_bits</span></code></dt>
340<dd>The size of the key in bits.</dd>
341<dt> <code class="docutils literal"><span class="pre">alg</span></code></dt>
342<dd>An asymmetric encryption algorithm: a value of type <a class="reference internal" href="algorithms.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="algorithms.html#c.PSA_ALG_IS_ASYMMETRIC_ENCRYPTION" title="PSA_ALG_IS_ASYMMETRIC_ENCRYPTION"><code class="docutils literal"><span class="pre">PSA_ALG_IS_ASYMMETRIC_ENCRYPTION</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>
343</dl>
344<p class="rubric">Returns</p>
345<p>A sufficient output buffer size for the specified asymmetric encryption algorithm and key parameters. An implementation can return either <code class="docutils literal"><span class="pre">0</span></code> or a correct size for an asymmetric encryption algorithm and key parameters that it recognizes, but does not support. If the parameters are not valid, the return value is unspecified.</p>
346<p class="rubric">Description</p>
347<p>If the size of the output buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_asymmetric_decrypt" title="psa_asymmetric_decrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_asymmetric_decrypt()</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>
348<p>See also <a class="reference internal" href="#c.PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE" title="PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE</span></code></a>.</p>
349</div>
350<div class="section" id="PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE">
351<span id="c.PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE"></span><h3><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</h3>
352<p>A sufficient output buffer size for <a class="reference internal" href="#c.psa_asymmetric_decrypt" title="psa_asymmetric_decrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_asymmetric_decrypt()</span></code></a>, for any of the supported key types and asymmetric encryption algorithms.</p>
353<pre class="literal-block">
354#define <a class="reference internal" href="#c.PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE" title="PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE">PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE</a> \
355 <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em>
356</pre>
357<p>If the size of the output buffer is at least this large, it is guaranteed that <a class="reference internal" href="#c.psa_asymmetric_decrypt" title="psa_asymmetric_decrypt"><code class="xref any c c-func docutils literal"><span class="pre">psa_asymmetric_decrypt()</span></code></a> will not fail due to an insufficient buffer size.</p>
358<p>See also <a class="reference internal" href="#c.PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE" title="PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE()</span></code></a>.</p>
359</div>
360</div>
361</div>
362
363
364 </div>
365 </div>
366 </div>
367 <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
368 <div class="sphinxsidebarwrapper"><h3><a href="../../index.html"><b>PSA Crypto API</b></a></h3>
369IHI 0086<br/>
370Non-confidential<br/>
371Version 1.1.0
372<span style="color: red; font-weight: bold;"></span>
373<ul>
374<li class="toctree-l1"><a class="reference internal" href="../../about.html">About this document</a></li>
375</ul>
376<ul class="current">
377<li class="toctree-l1"><a class="reference internal" href="../../overview/intro.html">1. Introduction</a></li>
378<li class="toctree-l1"><a class="reference internal" href="../../overview/goals.html">2. Design goals</a></li>
379<li class="toctree-l1"><a class="reference internal" href="../../overview/functionality.html">3. Functionality overview</a></li>
380<li class="toctree-l1"><a class="reference internal" href="../../overview/sample-arch.html">4. Sample architectures</a></li>
381<li class="toctree-l1"><a class="reference internal" href="../../overview/conventions.html">5. Library conventions</a></li>
382<li class="toctree-l1"><a class="reference internal" href="../../overview/implementation.html">6. Implementation considerations</a></li>
383<li class="toctree-l1"><a class="reference internal" href="../../overview/usage.html">7. Usage considerations</a></li>
384<li class="toctree-l1"><a class="reference internal" href="../library/index.html">8. Library management reference</a></li>
385<li class="toctree-l1"><a class="reference internal" href="../keys/index.html">9. Key management reference</a></li>
386<li class="toctree-l1 current"><a class="reference internal" href="index.html">10. Cryptographic operation reference</a><ul class="current">
387<li class="toctree-l2"><a class="reference internal" href="algorithms.html">10.1. Algorithms</a></li>
388<li class="toctree-l2"><a class="reference internal" href="hashes.html">10.2. Message digests (Hashes)</a></li>
389<li class="toctree-l2"><a class="reference internal" href="macs.html">10.3. Message authentication codes (MAC)</a></li>
390<li class="toctree-l2"><a class="reference internal" href="ciphers.html">10.4. Unauthenticated ciphers</a></li>
391<li class="toctree-l2"><a class="reference internal" href="aead.html">10.5. Authenticated encryption with associated data (AEAD)</a></li>
392<li class="toctree-l2"><a class="reference internal" href="kdf.html">10.6. Key derivation</a></li>
393<li class="toctree-l2"><a class="reference internal" href="sign.html">10.7. Asymmetric signature</a></li>
394<li class="toctree-l2 current"><a class="current reference internal" href="#">10.8. Asymmetric encryption</a><ul>
395<li class="toctree-l3"><a class="reference internal" href="#asymmetric-encryption-algorithms">10.8.1. Asymmetric encryption algorithms</a></li>
396<li class="toctree-l3"><a class="reference internal" href="#asymmetric-encryption-functions">10.8.2. Asymmetric encryption functions</a></li>
397<li class="toctree-l3"><a class="reference internal" href="#support-macros">10.8.3. Support macros</a></li>
398</ul>
399</li>
400<li class="toctree-l2"><a class="reference internal" href="ka.html">10.9. Key agreement</a></li>
401<li class="toctree-l2"><a class="reference internal" href="rng.html">10.10. Other cryptographic services</a></li>
402</ul>
403</li>
404</ul>
405<ul>
406<li class="toctree-l1"><a class="reference internal" href="../../appendix/example_header.html">Example header file</a></li>
407<li class="toctree-l1"><a class="reference internal" href="../../appendix/encodings.html">Algorithm and key type encoding</a></li>
408<li class="toctree-l1"><a class="reference internal" href="../../appendix/specdef_values.html">Example macro implementations</a></li>
409<li class="toctree-l1"><a class="reference internal" href="../../appendix/sra.html">Security Risk Assessment</a></li>
410<li class="toctree-l1"><a class="reference internal" href="../../appendix/history.html">Changes to the API</a></li>
411</ul>
412<ul>
413<li class="toctree-l1"><a class="reference internal" href="../../psa_c-identifiers.html">Index of API elements</a></li>
414</ul>
415<div id="searchbox" style="display: none" role="search">
416 <h3>Quick search</h3>
417 <form class="search" action="../../search.html" method="get">
418 <div><input type="text" name="q" /></div>
419 <div><input type="submit" value="Go" /></div>
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