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| <div class="section" id="asymmetric-encryption"> |
| <span id="pke"></span><h1>Asymmetric encryption</h1> |
| <div class="section" id="asymmetric-encryption-algorithms"> |
| <span id="id1"></span><h2>Asymmetric encryption algorithms</h2> |
| <div class="section" id="PSA_ALG_RSA_PKCS1V15_CRYPT"> |
| <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> |
| <p>RSA PKCS#1 v1.5 encryption.</p> |
| <pre class="literal-block"> |
| #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="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a>)0x07000200) |
| </pre> |
| </div> |
| <div class="section" id="PSA_ALG_RSA_OAEP"> |
| <span id="c.PSA_ALG_RSA_OAEP"></span><h3><code class="docutils literal"><span class="pre">PSA_ALG_RSA_OAEP</span></code> (macro)</h3> |
| <p>RSA OAEP encryption.</p> |
| <pre class="literal-block"> |
| #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> |
| </pre> |
| <p class="rubric">Parameters</p> |
| <dl class="docutils"> |
| <dt> <code class="docutils literal"><span class="pre">hash_alg</span></code></dt> |
| <dd>The hash 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_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) to use for MGF1.</dd> |
| </dl> |
| <p class="rubric">Returns</p> |
| <p>The corresponding RSA OAEP signature algorithm.</p> |
| <p>Unspecified if <code class="docutils literal"><span class="pre">hash_alg</span></code> is not a supported hash algorithm.</p> |
| <p class="rubric">Description</p> |
| <p>This is the encryption scheme defined by <a class="reference external" href="https://tools.ietf.org/html/rfc8017.html">RFC 8017</a> (PKCS#1: RSA Cryptography Specifications) under the name RSAES-OAEP, with the message generation function MGF1.</p> |
| </div> |
| </div> |
| <div class="section" id="asymmetric-encryption-functions"> |
| <h2>Asymmetric encryption functions</h2> |
| <div class="section" id="psa_asymmetric_encrypt"> |
| <span id="c.psa_asymmetric_encrypt"></span><h3><code class="docutils literal"><span class="pre">psa_asymmetric_encrypt</span></code> (function)</h3> |
| <p>Encrypt a short message with a public key.</p> |
| <pre class="literal-block"> |
| <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/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key, |
| <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg, |
| const uint8_t * input, |
| size_t input_length, |
| const uint8_t * salt, |
| size_t salt_length, |
| uint8_t * output, |
| size_t output_size, |
| size_t * output_length); |
| </pre> |
| <p class="rubric">Parameters</p> |
| <dl class="docutils"> |
| <dt> <code class="docutils literal"><span class="pre">key</span></code></dt> |
| <dd>Identifer of the key to use for the operation. It must be a public key or an asymmetric key pair. |
| It 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> |
| <dt> <code class="docutils literal"><span class="pre">alg</span></code></dt> |
| <dd>An asymmetric encryption algorithm that is compatible with the type of <code class="docutils literal"><span class="pre">key</span></code>.</dd> |
| <dt> <code class="docutils literal"><span class="pre">input</span></code></dt> |
| <dd>The message to encrypt.</dd> |
| <dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt> |
| <dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd> |
| <dt> <code class="docutils literal"><span class="pre">salt</span></code></dt> |
| <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> |
| <dt> <code class="docutils literal"><span class="pre">salt_length</span></code></dt> |
| <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> |
| <dt> <code class="docutils literal"><span class="pre">output</span></code></dt> |
| <dd>Buffer where the encrypted message is to be written.</dd> |
| <dt> <code class="docutils literal"><span class="pre">output_size</span></code></dt> |
| <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> |
| <ul class="last simple"> |
| <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> |
| <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> |
| </ul> |
| </dd> |
| <dt> <code class="docutils literal"><span class="pre">output_length</span></code></dt> |
| <dd>On success, the number of bytes that make up the returned output.</dd> |
| </dl> |
| <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> |
| <dl class="docutils"> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <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> |
| <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> |
| <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_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 the required buffer size.</dd> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <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> |
| </dl> |
| <p class="rubric">Description</p> |
| <ul class="simple"> |
| <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> |
| </ul> |
| </div> |
| <div class="section" id="psa_asymmetric_decrypt"> |
| <span id="c.psa_asymmetric_decrypt"></span><h3><code class="docutils literal"><span class="pre">psa_asymmetric_decrypt</span></code> (function)</h3> |
| <p>Decrypt a short message with a private key.</p> |
| <pre class="literal-block"> |
| <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/attributes.html#c.psa_key_id_t" title="psa_key_id_t">psa_key_id_t</a> key, |
| <a class="reference internal" href="../keys/attributes.html#c.psa_algorithm_t" title="psa_algorithm_t">psa_algorithm_t</a> alg, |
| const uint8_t * input, |
| size_t input_length, |
| const uint8_t * salt, |
| size_t salt_length, |
| uint8_t * output, |
| size_t output_size, |
| size_t * output_length); |
| </pre> |
| <p class="rubric">Parameters</p> |
| <dl class="docutils"> |
| <dt> <code class="docutils literal"><span class="pre">key</span></code></dt> |
| <dd>Identifier of the key to use for the operation. It must be an asymmetric key pair. |
| It 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> |
| <dt> <code class="docutils literal"><span class="pre">alg</span></code></dt> |
| <dd>An asymmetric encryption algorithm that is compatible with the type of <code class="docutils literal"><span class="pre">key</span></code>.</dd> |
| <dt> <code class="docutils literal"><span class="pre">input</span></code></dt> |
| <dd>The message to decrypt.</dd> |
| <dt> <code class="docutils literal"><span class="pre">input_length</span></code></dt> |
| <dd>Size of the <code class="docutils literal"><span class="pre">input</span></code> buffer in bytes.</dd> |
| <dt> <code class="docutils literal"><span class="pre">salt</span></code></dt> |
| <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> |
| <dt> <code class="docutils literal"><span class="pre">salt_length</span></code></dt> |
| <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> |
| <dt> <code class="docutils literal"><span class="pre">output</span></code></dt> |
| <dd>Buffer where the decrypted message is to be written.</dd> |
| <dt> <code class="docutils literal"><span class="pre">output_size</span></code></dt> |
| <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> |
| <ul class="last simple"> |
| <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> |
| <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> |
| </ul> |
| </dd> |
| <dt> <code class="docutils literal"><span class="pre">output_length</span></code></dt> |
| <dd>On success, the number of bytes that make up the returned output.</dd> |
| </dl> |
| <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> |
| <dl class="docutils"> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <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> |
| <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> |
| <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_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 the required buffer size.</dd> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <dd></dd> |
| <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> |
| <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> |
| </dl> |
| <p class="rubric">Description</p> |
| <ul class="simple"> |
| <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> |
| </ul> |
| </div> |
| </div> |
| <div class="section" id="support-macros"> |
| <h2>Support macros</h2> |
| <div class="section" id="PSA_ALG_IS_RSA_OAEP"> |
| <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> |
| <p>Whether the specified algorithm is an RSA OAEP encryption algorithm.</p> |
| <pre class="literal-block"> |
| #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> |
| </pre> |
| <p class="rubric">Parameters</p> |
| <dl class="docutils"> |
| <dt> <code class="docutils literal"><span class="pre">alg</span></code></dt> |
| <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> |
| </dl> |
| <p class="rubric">Returns</p> |
| <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> |
| <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> |
| </div> |
| <div class="section" id="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE"> |
| <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> |
| <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> |
| <pre class="literal-block"> |
| #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) \ |
| <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em> |
| </pre> |
| <p class="rubric">Parameters</p> |
| <dl class="docutils"> |
| <dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt> |
| <dd>An asymmetric key type, either a key pair or a public key.</dd> |
| <dt> <code class="docutils literal"><span class="pre">key_bits</span></code></dt> |
| <dd>The size of the key in bits.</dd> |
| <dt> <code class="docutils literal"><span class="pre">alg</span></code></dt> |
| <dd>The signature algorithm.</dd> |
| </dl> |
| <p class="rubric">Returns</p> |
| <p>If the parameters are valid and supported, return a buffer size in bytes that guarantees 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 with <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a>. If the parameters are a valid combination that is not supported by the implementation, this macro must return either a sensible size or <code class="docutils literal"><span class="pre">0</span></code>. If the parameters are not valid, the return value is unspecified.</p> |
| <p class="rubric">Description</p> |
| <p>This macro returns a sufficient buffer size for a ciphertext produced using a key of the specified type and size, with the specified algorithm. Note that the actual size of the ciphertext might be smaller, depending on the algorithm.</p> |
| <div class="admonition warning"> |
| <p class="first admonition-title">Warning</p> |
| <p class="last">This function might evaluate its arguments multiple times or zero times. Providing arguments that have side effects will result in implementation-specific behavior, and is non-portable.</p> |
| </div> |
| <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> |
| </div> |
| <div class="section" id="PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE"> |
| <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> |
| <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 supported asymmetric encryption.</p> |
| <pre class="literal-block"> |
| #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> \ |
| <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em> |
| </pre> |
| <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> |
| </div> |
| <div class="section" id="PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE"> |
| <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> |
| <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> |
| <pre class="literal-block"> |
| #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) \ |
| <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em> |
| </pre> |
| <p class="rubric">Parameters</p> |
| <dl class="docutils"> |
| <dt> <code class="docutils literal"><span class="pre">key_type</span></code></dt> |
| <dd>An asymmetric key type, either a key pair or a public key.</dd> |
| <dt> <code class="docutils literal"><span class="pre">key_bits</span></code></dt> |
| <dd>The size of the key in bits.</dd> |
| <dt> <code class="docutils literal"><span class="pre">alg</span></code></dt> |
| <dd>The signature algorithm.</dd> |
| </dl> |
| <p class="rubric">Returns</p> |
| <p>If the parameters are valid and supported, return a buffer size in bytes that guarantees 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 with <a class="reference internal" href="../library/status.html#c.PSA_ERROR_BUFFER_TOO_SMALL" title="PSA_ERROR_BUFFER_TOO_SMALL"><code class="xref any c c-macro docutils literal"><span class="pre">PSA_ERROR_BUFFER_TOO_SMALL</span></code></a>. If the parameters are a valid combination that is not supported by the implementation, this macro must return either a sensible size or <code class="docutils literal"><span class="pre">0</span></code>. If the parameters are not valid, the return value is unspecified.</p> |
| <p class="rubric">Description</p> |
| <p>This macro returns a sufficient buffer size for a ciphertext produced using a key of the specified type and size, with the specified algorithm. Note that the actual size of the ciphertext might be smaller, depending on the algorithm.</p> |
| <div class="admonition warning"> |
| <p class="first admonition-title">Warning</p> |
| <p class="last">This function might evaluate its arguments multiple times or zero times. Providing arguments that have side effects will result in implementation-specific behavior, and is non-portable.</p> |
| </div> |
| <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> |
| </div> |
| <div class="section" id="PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE"> |
| <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> |
| <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 supported asymmetric decryption.</p> |
| <pre class="literal-block"> |
| #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> \ |
| <em><a class="reference internal" href="../../overview/implementation.html#implementation-defined-value"><span class="std std-ref">/* implementation-defined value */</span></a></em> |
| </pre> |
| <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> |
| </div> |
| </div> |
| </div> |
| |
| |
| </div> |
| </div> |
| </div> |
| <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> |
| <div class="sphinxsidebarwrapper"> |
| <h3><a href="../../index.html">Table Of Contents</a></h3> |
| <ul> |
| <li><a class="reference internal" href="#">Asymmetric encryption</a><ul> |
| <li><a class="reference internal" href="#asymmetric-encryption-algorithms">Asymmetric encryption algorithms</a><ul> |
| <li><a class="reference internal" href="#PSA_ALG_RSA_PKCS1V15_CRYPT"><code class="docutils literal"><span class="pre">PSA_ALG_RSA_PKCS1V15_CRYPT</span></code> (macro)</a></li> |
| <li><a class="reference internal" href="#PSA_ALG_RSA_OAEP"><code class="docutils literal"><span class="pre">PSA_ALG_RSA_OAEP</span></code> (macro)</a></li> |
| </ul> |
| </li> |
| <li><a class="reference internal" href="#asymmetric-encryption-functions">Asymmetric encryption functions</a><ul> |
| <li><a class="reference internal" href="#psa_asymmetric_encrypt"><code class="docutils literal"><span class="pre">psa_asymmetric_encrypt</span></code> (function)</a></li> |
| <li><a class="reference internal" href="#psa_asymmetric_decrypt"><code class="docutils literal"><span class="pre">psa_asymmetric_decrypt</span></code> (function)</a></li> |
| </ul> |
| </li> |
| <li><a class="reference internal" href="#support-macros">Support macros</a><ul> |
| <li><a class="reference internal" href="#PSA_ALG_IS_RSA_OAEP"><code class="docutils literal"><span class="pre">PSA_ALG_IS_RSA_OAEP</span></code> (macro)</a></li> |
| <li><a class="reference internal" href="#PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE</span></code> (macro)</a></li> |
| <li><a class="reference internal" href="#PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</a></li> |
| <li><a class="reference internal" href="#PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE"><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE</span></code> (macro)</a></li> |
| <li><a class="reference internal" href="#PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE"><code class="docutils literal"><span class="pre">PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE</span></code> (macro)</a></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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| <li>Previous: <a href="sign.html" title="previous chapter">Asymmetric signature</a></li> |
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