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<div id="projectname">Platform Security Architecture — cryptography and keystore interface
&#160;<span id="projectnumber">beta 2 — 2019-02-22</span>
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<a href="#func-members">Functions</a> </div>
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<div class="title">Key management</div> </div>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ga1e4825ab59260aeb3bdbb3ff07210022"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__error.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__key__management.html#ga1e4825ab59260aeb3bdbb3ff07210022">psa_get_key_lifetime</a> (<a class="el" href="group__platform.html#gabf6d5fd4e2ea89ecd425c88f057e7f75">psa_key_handle_t</a> handle, <a class="el" href="group__key__lifetimes.html#ga6821ff6dd39dc2bc370ded760ad8b0cf">psa_key_lifetime_t</a> *lifetime)</td></tr>
<tr class="memdesc:ga1e4825ab59260aeb3bdbb3ff07210022"><td class="mdescLeft">&#160;</td><td class="mdescRight">Retrieve the lifetime of an open key. <a href="#ga1e4825ab59260aeb3bdbb3ff07210022">More...</a><br /></td></tr>
<tr class="separator:ga1e4825ab59260aeb3bdbb3ff07210022"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga40094b77b7a42b9c8e158395113f1a35"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__error.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__key__management.html#ga40094b77b7a42b9c8e158395113f1a35">psa_allocate_key</a> (<a class="el" href="group__platform.html#gabf6d5fd4e2ea89ecd425c88f057e7f75">psa_key_handle_t</a> *handle)</td></tr>
<tr class="separator:ga40094b77b7a42b9c8e158395113f1a35"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gaa9f1c848cf78b80fe2a7b18bb7ccec50"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__error.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__key__management.html#gaa9f1c848cf78b80fe2a7b18bb7ccec50">psa_open_key</a> (<a class="el" href="group__key__lifetimes.html#ga6821ff6dd39dc2bc370ded760ad8b0cf">psa_key_lifetime_t</a> lifetime, <a class="el" href="group__key__lifetimes.html#ga11e986351c65bd3dc3c0fe2cd9926e4b">psa_key_id_t</a> id, <a class="el" href="group__platform.html#gabf6d5fd4e2ea89ecd425c88f057e7f75">psa_key_handle_t</a> *handle)</td></tr>
<tr class="separator:gaa9f1c848cf78b80fe2a7b18bb7ccec50"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga4108f255d3eaa6d23a7a14b684af8d7c"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__error.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__key__management.html#ga4108f255d3eaa6d23a7a14b684af8d7c">psa_create_key</a> (<a class="el" href="group__key__lifetimes.html#ga6821ff6dd39dc2bc370ded760ad8b0cf">psa_key_lifetime_t</a> lifetime, <a class="el" href="group__key__lifetimes.html#ga11e986351c65bd3dc3c0fe2cd9926e4b">psa_key_id_t</a> id, <a class="el" href="group__platform.html#gabf6d5fd4e2ea89ecd425c88f057e7f75">psa_key_handle_t</a> *handle)</td></tr>
<tr class="separator:ga4108f255d3eaa6d23a7a14b684af8d7c"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gaa09b720d299dfe6b9f41c36e448078eb"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__error.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__key__management.html#gaa09b720d299dfe6b9f41c36e448078eb">psa_close_key</a> (<a class="el" href="group__platform.html#gabf6d5fd4e2ea89ecd425c88f057e7f75">psa_key_handle_t</a> handle)</td></tr>
<tr class="separator:gaa09b720d299dfe6b9f41c36e448078eb"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2 class="groupheader">Function Documentation</h2>
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<td class="memname"><a class="el" href="group__error.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a> psa_allocate_key </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__platform.html#gabf6d5fd4e2ea89ecd425c88f057e7f75">psa_key_handle_t</a> *&#160;</td>
<td class="paramname"><em>handle</em></td><td>)</td>
<td></td>
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</div><div class="memdoc">
<p>Allocate a key slot for a transient key, i.e. a key which is only stored in volatile memory.</p>
<p>The allocated key slot and its handle remain valid until the application calls <a class="el" href="group__key__management.html#gaa09b720d299dfe6b9f41c36e448078eb">psa_close_key()</a> or <a class="el" href="group__import__export.html#ga165085fc1bc7a78b91792fdd94ae102c" title="Destroy a key. ">psa_destroy_key()</a> or until the application terminates.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[out]</td><td class="paramname">handle</td><td>On success, a handle to a volatile key slot.</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__error.html#ga4cc859e2c66ca381c7418db3527a65e1">PSA_SUCCESS</a></td><td>Success. The application can now use the value of <code>*handle</code> to access the newly allocated key slot. </td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#ga91b2ad8a867517a2651f1b076c5216e5">PSA_ERROR_INSUFFICIENT_MEMORY</a></td><td>There was not enough memory, or the maximum number of key slots has been reached. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
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<td class="memname"><a class="el" href="group__error.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a> psa_close_key </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__platform.html#gabf6d5fd4e2ea89ecd425c88f057e7f75">psa_key_handle_t</a>&#160;</td>
<td class="paramname"><em>handle</em></td><td>)</td>
<td></td>
</tr>
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</div><div class="memdoc">
<p>Close a key handle.</p>
<p>If the handle designates a volatile key, destroy the key material and free all associated resources, just like <a class="el" href="group__import__export.html#ga165085fc1bc7a78b91792fdd94ae102c" title="Destroy a key. ">psa_destroy_key()</a>.</p>
<p>If the handle designates a persistent key, free all resources associated with the key in volatile memory. The key slot in persistent storage is not affected and can be opened again later with <a class="el" href="group__key__management.html#gaa9f1c848cf78b80fe2a7b18bb7ccec50">psa_open_key()</a>.</p>
<p>If the key is currently in use in a multipart operation, the multipart operation is aborted.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">handle</td><td>The key handle to close.</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__error.html#ga4cc859e2c66ca381c7418db3527a65e1">PSA_SUCCESS</a></td><td></td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#gadf22718935657c2c3168c228204085f9">PSA_ERROR_INVALID_HANDLE</a></td><td></td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#ga5cdb6948371d49e916106249020ea3f7">PSA_ERROR_COMMUNICATION_FAILURE</a></td><td></td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ga4108f255d3eaa6d23a7a14b684af8d7c"></a>
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<td class="memname"><a class="el" href="group__error.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a> psa_create_key </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__key__lifetimes.html#ga6821ff6dd39dc2bc370ded760ad8b0cf">psa_key_lifetime_t</a>&#160;</td>
<td class="paramname"><em>lifetime</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__key__lifetimes.html#ga11e986351c65bd3dc3c0fe2cd9926e4b">psa_key_id_t</a>&#160;</td>
<td class="paramname"><em>id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__platform.html#gabf6d5fd4e2ea89ecd425c88f057e7f75">psa_key_handle_t</a> *&#160;</td>
<td class="paramname"><em>handle</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Create a new persistent key slot.</p>
<p>Create a new persistent key slot and return a handle to it. The handle remains valid until the application calls <a class="el" href="group__key__management.html#gaa09b720d299dfe6b9f41c36e448078eb">psa_close_key()</a> or terminates. The application can open the key again with <a class="el" href="group__key__management.html#gaa9f1c848cf78b80fe2a7b18bb7ccec50">psa_open_key()</a> until it removes the key by calling <a class="el" href="group__import__export.html#ga165085fc1bc7a78b91792fdd94ae102c" title="Destroy a key. ">psa_destroy_key()</a>.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir"></td><td class="paramname">lifetime</td><td>The lifetime of the key. This designates a storage area where the key material is stored. This must not be <a class="el" href="group__key__lifetimes.html#ga8b438870ba69489b685730d346455108">PSA_KEY_LIFETIME_VOLATILE</a>. </td></tr>
<tr><td class="paramdir"></td><td class="paramname">id</td><td>The persistent identifier of the key. </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">handle</td><td>On success, a handle to the newly created key slot. When key material is later created in this key slot, it will be saved to the specified persistent location.</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__error.html#ga4cc859e2c66ca381c7418db3527a65e1">PSA_SUCCESS</a></td><td>Success. The application can now use the value of <code>*handle</code> to access the newly allocated key slot. </td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#ga91b2ad8a867517a2651f1b076c5216e5">PSA_ERROR_INSUFFICIENT_MEMORY</a></td><td></td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#ga897a45eb206a6f6b7be7ffbe36f0d766">PSA_ERROR_INSUFFICIENT_STORAGE</a></td><td></td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#gac2fee3a51249fbea45360aaa911f3e58">PSA_ERROR_OCCUPIED_SLOT</a></td><td>There is already a key with the identifier <code>id</code> in the storage area designated by <code>lifetime</code>. </td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#ga798df25a505ebf931f7bec1f80f1f85f">PSA_ERROR_INVALID_ARGUMENT</a></td><td><code>lifetime</code> is invalid, for example <a class="el" href="group__key__lifetimes.html#ga8b438870ba69489b685730d346455108">PSA_KEY_LIFETIME_VOLATILE</a>. </td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#ga798df25a505ebf931f7bec1f80f1f85f">PSA_ERROR_INVALID_ARGUMENT</a></td><td><code>id</code> is invalid for the specified lifetime. </td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#ga1dcc6d130633ed5db8942257581b55dd">PSA_ERROR_NOT_SUPPORTED</a></td><td><code>lifetime</code> is not supported. </td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#ga4d1b8dd8526177a15a210b7afc1accb1">PSA_ERROR_NOT_PERMITTED</a></td><td><code>lifetime</code> is valid, but the application does not have the permission to create a key there. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ga1e4825ab59260aeb3bdbb3ff07210022"></a>
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<td class="memname"><a class="el" href="group__error.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a> psa_get_key_lifetime </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__platform.html#gabf6d5fd4e2ea89ecd425c88f057e7f75">psa_key_handle_t</a>&#160;</td>
<td class="paramname"><em>handle</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__key__lifetimes.html#ga6821ff6dd39dc2bc370ded760ad8b0cf">psa_key_lifetime_t</a> *&#160;</td>
<td class="paramname"><em>lifetime</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
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</div><div class="memdoc">
<p>Retrieve the lifetime of an open key. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir"></td><td class="paramname">handle</td><td>Handle to query. </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">lifetime</td><td>On success, the lifetime value.</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__error.html#ga4cc859e2c66ca381c7418db3527a65e1">PSA_SUCCESS</a></td><td>Success. </td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#gadf22718935657c2c3168c228204085f9">PSA_ERROR_INVALID_HANDLE</a></td><td></td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#ga5cdb6948371d49e916106249020ea3f7">PSA_ERROR_COMMUNICATION_FAILURE</a></td><td></td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#ga08b10e70fa5ff0b05c631d9f8f6b2c6b">PSA_ERROR_HARDWARE_FAILURE</a></td><td></td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#ga2c5dda1485cb54f2385cb9c1279a7004">PSA_ERROR_TAMPERING_DETECTED</a></td><td></td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#ga933d40fa2a591004f2e93aa91e11db84">PSA_ERROR_BAD_STATE</a></td><td>The library has not been previously initialized by <a class="el" href="group__initialization.html#ga2de150803fc2f7dc6101d5af7e921dd9" title="Library initialization. ">psa_crypto_init()</a>. It is implementation-dependent whether a failure to initialize results in this error code. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
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<td class="memname"><a class="el" href="group__error.html#ga05676e70ba5c6a7565aff3c36677c1f9">psa_status_t</a> psa_open_key </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__key__lifetimes.html#ga6821ff6dd39dc2bc370ded760ad8b0cf">psa_key_lifetime_t</a>&#160;</td>
<td class="paramname"><em>lifetime</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__key__lifetimes.html#ga11e986351c65bd3dc3c0fe2cd9926e4b">psa_key_id_t</a>&#160;</td>
<td class="paramname"><em>id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__platform.html#gabf6d5fd4e2ea89ecd425c88f057e7f75">psa_key_handle_t</a> *&#160;</td>
<td class="paramname"><em>handle</em>&#160;</td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>Open a handle to an existing persistent key.</p>
<p>Open a handle to a key which was previously created with <a class="el" href="group__key__management.html#ga4108f255d3eaa6d23a7a14b684af8d7c">psa_create_key()</a>.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir"></td><td class="paramname">lifetime</td><td>The lifetime of the key. This designates a storage area where the key material is stored. This must not be <a class="el" href="group__key__lifetimes.html#ga8b438870ba69489b685730d346455108">PSA_KEY_LIFETIME_VOLATILE</a>. </td></tr>
<tr><td class="paramdir"></td><td class="paramname">id</td><td>The persistent identifier of the key. </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">handle</td><td>On success, a handle to a key slot which contains the data and metadata loaded from the specified persistent location.</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__error.html#ga4cc859e2c66ca381c7418db3527a65e1">PSA_SUCCESS</a></td><td>Success. The application can now use the value of <code>*handle</code> to access the newly allocated key slot. </td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#ga91b2ad8a867517a2651f1b076c5216e5">PSA_ERROR_INSUFFICIENT_MEMORY</a></td><td></td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#gaba00e3e6ceb2b12965a81e5ac02ae040">PSA_ERROR_EMPTY_SLOT</a></td><td></td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#ga798df25a505ebf931f7bec1f80f1f85f">PSA_ERROR_INVALID_ARGUMENT</a></td><td><code>lifetime</code> is invalid, for example <a class="el" href="group__key__lifetimes.html#ga8b438870ba69489b685730d346455108">PSA_KEY_LIFETIME_VOLATILE</a>. </td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#ga798df25a505ebf931f7bec1f80f1f85f">PSA_ERROR_INVALID_ARGUMENT</a></td><td><code>id</code> is invalid for the specified lifetime. </td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#ga1dcc6d130633ed5db8942257581b55dd">PSA_ERROR_NOT_SUPPORTED</a></td><td><code>lifetime</code> is not supported. </td></tr>
<tr><td class="paramname"><a class="el" href="group__error.html#ga4d1b8dd8526177a15a210b7afc1accb1">PSA_ERROR_NOT_PERMITTED</a></td><td>The specified key exists, but the application does not have the permission to access it. Note that this specification does not define any way to create such a key, but it may be possible through implementation-specific means. </td></tr>
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