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| <div class="title">Key derivation</div> </div> |
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| Functions</h2></td></tr> |
| <tr class="memitem:ga1b6429f443a45e5f3209043abbbe8315"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__basic.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__derivation.html#ga1b6429f443a45e5f3209043abbbe8315">psa_key_derivation</a> (<a class="el" href="group__generators.html#ga1f894c4fba202ef8e307d72caf489e3b">psa_crypto_generator_t</a> *generator, <a class="el" href="group__platform.html#gac3da92a6b8a7f0c01dc348f8e0432e4c">psa_key_slot_t</a> key, <a class="el" href="group__crypto__types.html#gac2e4d47f1300d73c2f829a6d99252d69">psa_algorithm_t</a> alg, const uint8_t *salt, size_t salt_length, const uint8_t *label, size_t label_length, size_t capacity)</td></tr> |
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| <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2> |
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| <h2 class="memtitle"><span class="permalink"><a href="#ga1b6429f443a45e5f3209043abbbe8315">◆ </a></span>psa_key_derivation()</h2> |
| |
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| <td class="memname"><a class="el" href="group__basic.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a> psa_key_derivation </td> |
| <td>(</td> |
| <td class="paramtype"><a class="el" href="group__generators.html#ga1f894c4fba202ef8e307d72caf489e3b">psa_crypto_generator_t</a> * </td> |
| <td class="paramname"><em>generator</em>, </td> |
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| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype"><a class="el" href="group__platform.html#gac3da92a6b8a7f0c01dc348f8e0432e4c">psa_key_slot_t</a> </td> |
| <td class="paramname"><em>key</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype"><a class="el" href="group__crypto__types.html#gac2e4d47f1300d73c2f829a6d99252d69">psa_algorithm_t</a> </td> |
| <td class="paramname"><em>alg</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">const uint8_t * </td> |
| <td class="paramname"><em>salt</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">size_t </td> |
| <td class="paramname"><em>salt_length</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">const uint8_t * </td> |
| <td class="paramname"><em>label</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">size_t </td> |
| <td class="paramname"><em>label_length</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">size_t </td> |
| <td class="paramname"><em>capacity</em> </td> |
| </tr> |
| <tr> |
| <td></td> |
| <td>)</td> |
| <td></td><td></td> |
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| <p>Set up a key derivation operation.</p> |
| <p>A key derivation algorithm takes three inputs: a secret input <code>key</code> and two non-secret inputs <code>label</code> and p salt. The result of this function is a byte generator which can be used to produce keys and other cryptographic material.</p> |
| <p>The role of <code>label</code> and <code>salt</code> is as follows:</p><ul> |
| <li>For HKDF (<a class="el" href="group__crypto__types.html#ga32a888fb360e6e25cab8a343772c4a82">PSA_ALG_HKDF</a>), <code>salt</code> is the salt used in the "extract" step and <code>label</code> is the info string used in the "expand" step.</li> |
| </ul> |
| <dl class="params"><dt>Parameters</dt><dd> |
| <table class="params"> |
| <tr><td class="paramdir">[in,out]</td><td class="paramname">generator</td><td>The generator object to set up. It must have been initialized to . </td></tr> |
| <tr><td class="paramdir"></td><td class="paramname">key</td><td>Slot containing the secret key to use. </td></tr> |
| <tr><td class="paramdir"></td><td class="paramname">alg</td><td>The key derivation algorithm to compute (<code>PSA_ALG_XXX</code> value such that <a class="el" href="group__crypto__types.html#gaf8b90c648aa53dbd06c236695e300cd0">PSA_ALG_IS_KEY_DERIVATION</a>(<code>alg</code>) is true). </td></tr> |
| <tr><td class="paramdir">[in]</td><td class="paramname">salt</td><td>Salt to use. </td></tr> |
| <tr><td class="paramdir"></td><td class="paramname">salt_length</td><td>Size of the <code>salt</code> buffer in bytes. </td></tr> |
| <tr><td class="paramdir">[in]</td><td class="paramname">label</td><td>Label to use. </td></tr> |
| <tr><td class="paramdir"></td><td class="paramname">label_length</td><td>Size of the <code>label</code> buffer in bytes. </td></tr> |
| <tr><td class="paramdir"></td><td class="paramname">capacity</td><td>The maximum number of bytes that the generator will be able to provide.</td></tr> |
| </table> |
| </dd> |
| </dl> |
| <dl class="retval"><dt>Return values</dt><dd> |
| <table class="retval"> |
| <tr><td class="paramname"><a class="el" href="group__basic.html#ga4cc859e2c66ca381c7418db3527a65e1">PSA_SUCCESS</a></td><td>Success. </td></tr> |
| <tr><td class="paramname"><a class="el" href="group__basic.html#gaba00e3e6ceb2b12965a81e5ac02ae040">PSA_ERROR_EMPTY_SLOT</a></td><td></td></tr> |
| <tr><td class="paramname"><a class="el" href="group__basic.html#ga4d1b8dd8526177a15a210b7afc1accb1">PSA_ERROR_NOT_PERMITTED</a></td><td></td></tr> |
| <tr><td class="paramname"><a class="el" href="group__basic.html#ga798df25a505ebf931f7bec1f80f1f85f">PSA_ERROR_INVALID_ARGUMENT</a></td><td><code>key</code> is not compatible with <code>alg</code>, or <code>capacity</code> is too large for the specified algorithm and key. </td></tr> |
| <tr><td class="paramname"><a class="el" href="group__basic.html#ga1dcc6d130633ed5db8942257581b55dd">PSA_ERROR_NOT_SUPPORTED</a></td><td><code>alg</code> is not supported or is not a key derivation algorithm. </td></tr> |
| <tr><td class="paramname"><a class="el" href="group__basic.html#ga91b2ad8a867517a2651f1b076c5216e5">PSA_ERROR_INSUFFICIENT_MEMORY</a></td><td></td></tr> |
| <tr><td class="paramname"><a class="el" href="group__basic.html#ga5cdb6948371d49e916106249020ea3f7">PSA_ERROR_COMMUNICATION_FAILURE</a></td><td></td></tr> |
| <tr><td class="paramname"><a class="el" href="group__basic.html#ga08b10e70fa5ff0b05c631d9f8f6b2c6b">PSA_ERROR_HARDWARE_FAILURE</a></td><td></td></tr> |
| <tr><td class="paramname"><a class="el" href="group__basic.html#ga2c5dda1485cb54f2385cb9c1279a7004">PSA_ERROR_TAMPERING_DETECTED</a></td><td></td></tr> |
| </table> |
| </dd> |
| </dl> |
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