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<p>HMAC_DRBG (NIST SP 800-90A)
<a href="#details">More...</a></p>
<div class="textblock"><code>#include "<a class="el" href="md_8h_source.html">md.h</a>"</code><br />
<code>#include "<a class="el" href="threading_8h_source.html">mbedtls/threading.h</a>"</code><br />
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Include dependency graph for hmac_drbg.h:</div>
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<p><a href="hmac__drbg_8h_source.html">Go to the source code of this file.</a></p>
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Data Structures</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a></td></tr>
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Macros</h2></td></tr>
<tr class="memitem:a9b2cc8521b7ac670ecf41c3788b0d847"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#a9b2cc8521b7ac670ecf41c3788b0d847">MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG</a>   -0x0003</td></tr>
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<tr class="memitem:a0afd76b63cb8715577ba44de755af1fe"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#a0afd76b63cb8715577ba44de755af1fe">MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG</a>   -0x0005</td></tr>
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<tr class="memitem:ae5ccb23af2f8faf60deb292208af66f7"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#ae5ccb23af2f8faf60deb292208af66f7">MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR</a>   -0x0007</td></tr>
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<tr class="memitem:ac384cdd999b9733a5e4a8112c4f14291"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#ac384cdd999b9733a5e4a8112c4f14291">MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED</a>   -0x0009</td></tr>
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<tr class="memitem:acbb59dffae4915b9a17142aaed752c57"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#acbb59dffae4915b9a17142aaed752c57">MBEDTLS_HMAC_DRBG_PR_OFF</a>   0</td></tr>
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<tr class="memitem:ac8c4bb0b84fb1c848cdb5fa240ef5e22"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#ac8c4bb0b84fb1c848cdb5fa240ef5e22">MBEDTLS_HMAC_DRBG_PR_ON</a>   1</td></tr>
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<tr><td colspan="2"><div class="groupHeader">SECTION: Module settings</div></td></tr>
<tr><td colspan="2"><div class="groupText"><p>The configuration options you can set for this module are in this section. Either change them in <a class="el" href="config_8h.html" title="Configuration options (set of defines) ">config.h</a> or define them on the compiler command line. </p>
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<tr class="memitem:aa7b7ad2ef442817cc4d48909c39a97e0"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#aa7b7ad2ef442817cc4d48909c39a97e0">MBEDTLS_HMAC_DRBG_RESEED_INTERVAL</a>   10000</td></tr>
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<tr class="memitem:a10b5abc1576c6a9fa766ce1e01d6e54f"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#a10b5abc1576c6a9fa766ce1e01d6e54f">MBEDTLS_HMAC_DRBG_MAX_INPUT</a>   256</td></tr>
<tr class="separator:a10b5abc1576c6a9fa766ce1e01d6e54f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a3d3785a3eef7b56ca25df77a3912fbb4"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#a3d3785a3eef7b56ca25df77a3912fbb4">MBEDTLS_HMAC_DRBG_MAX_REQUEST</a>   1024</td></tr>
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<tr class="memitem:a8d52d7d5113feb2f54eda19dfd97a942"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#a8d52d7d5113feb2f54eda19dfd97a942">MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT</a>   384</td></tr>
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Functions</h2></td></tr>
<tr class="memitem:a10881c328300a9ddb7cd5fe359c18acd"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#a10881c328300a9ddb7cd5fe359c18acd">mbedtls_hmac_drbg_init</a> (<a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> *ctx)</td></tr>
<tr class="memdesc:a10881c328300a9ddb7cd5fe359c18acd"><td class="mdescLeft"> </td><td class="mdescRight">HMAC_DRBG context initialization Makes the context ready for <a class="el" href="hmac__drbg_8h.html#a0af34e5c68f15dfe714b5da94bce8f74" title="HMAC_DRBG initial seeding Seed and setup entropy source for future reseeds. ">mbedtls_hmac_drbg_seed()</a>, <a class="el" href="hmac__drbg_8h.html#a45cb3ab23ff6058a4e14f4140ca9f0f4" title="Initilisation of simpified HMAC_DRBG (never reseeds). (For use with deterministic ECDSA...">mbedtls_hmac_drbg_seed_buf()</a> or <a class="el" href="hmac__drbg_8h.html#a41e1f127304b1228d9f134d38e200e8a" title="Free an HMAC_DRBG context. ">mbedtls_hmac_drbg_free()</a>. <a href="#a10881c328300a9ddb7cd5fe359c18acd">More...</a><br /></td></tr>
<tr class="separator:a10881c328300a9ddb7cd5fe359c18acd"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a0af34e5c68f15dfe714b5da94bce8f74"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#a0af34e5c68f15dfe714b5da94bce8f74">mbedtls_hmac_drbg_seed</a> (<a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> *ctx, const <a class="el" href="md_8h.html#a496e73a6f229eba89b4abd9955822adb">mbedtls_md_info_t</a> *md_info, int(*f_entropy)(void *, unsigned char *, size_t), void *p_entropy, const unsigned char *custom, size_t len)</td></tr>
<tr class="memdesc:a0af34e5c68f15dfe714b5da94bce8f74"><td class="mdescLeft"> </td><td class="mdescRight">HMAC_DRBG initial seeding Seed and setup entropy source for future reseeds. <a href="#a0af34e5c68f15dfe714b5da94bce8f74">More...</a><br /></td></tr>
<tr class="separator:a0af34e5c68f15dfe714b5da94bce8f74"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a45cb3ab23ff6058a4e14f4140ca9f0f4"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#a45cb3ab23ff6058a4e14f4140ca9f0f4">mbedtls_hmac_drbg_seed_buf</a> (<a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> *ctx, const <a class="el" href="md_8h.html#a496e73a6f229eba89b4abd9955822adb">mbedtls_md_info_t</a> *md_info, const unsigned char *data, size_t data_len)</td></tr>
<tr class="memdesc:a45cb3ab23ff6058a4e14f4140ca9f0f4"><td class="mdescLeft"> </td><td class="mdescRight">Initilisation of simpified HMAC_DRBG (never reseeds). (For use with deterministic ECDSA.) <a href="#a45cb3ab23ff6058a4e14f4140ca9f0f4">More...</a><br /></td></tr>
<tr class="separator:a45cb3ab23ff6058a4e14f4140ca9f0f4"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a0a874c42e24bd02c9805be58b3f04083"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#a0a874c42e24bd02c9805be58b3f04083">mbedtls_hmac_drbg_set_prediction_resistance</a> (<a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> *ctx, int resistance)</td></tr>
<tr class="memdesc:a0a874c42e24bd02c9805be58b3f04083"><td class="mdescLeft"> </td><td class="mdescRight">Enable / disable prediction resistance (Default: Off) <a href="#a0a874c42e24bd02c9805be58b3f04083">More...</a><br /></td></tr>
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<tr class="memitem:a6a396cfe0ab81e07dd676ff75163b474"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#a6a396cfe0ab81e07dd676ff75163b474">mbedtls_hmac_drbg_set_entropy_len</a> (<a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> *ctx, size_t len)</td></tr>
<tr class="memdesc:a6a396cfe0ab81e07dd676ff75163b474"><td class="mdescLeft"> </td><td class="mdescRight">Set the amount of entropy grabbed on each reseed (Default: given by the security strength, which depends on the hash used, see <code><a class="el" href="hmac__drbg_8h.html#a10881c328300a9ddb7cd5fe359c18acd" title="HMAC_DRBG context initialization Makes the context ready for mbedtls_hmac_drbg_seed(), mbedtls_hmac_drbg_seed_buf() or mbedtls_hmac_drbg_free(). ">mbedtls_hmac_drbg_init()</a></code> ) <a href="#a6a396cfe0ab81e07dd676ff75163b474">More...</a><br /></td></tr>
<tr class="separator:a6a396cfe0ab81e07dd676ff75163b474"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a17f9f894c4765e75d66b5b2fc8404fb2"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#a17f9f894c4765e75d66b5b2fc8404fb2">mbedtls_hmac_drbg_set_reseed_interval</a> (<a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> *ctx, int interval)</td></tr>
<tr class="memdesc:a17f9f894c4765e75d66b5b2fc8404fb2"><td class="mdescLeft"> </td><td class="mdescRight">Set the reseed interval (Default: MBEDTLS_HMAC_DRBG_RESEED_INTERVAL) <a href="#a17f9f894c4765e75d66b5b2fc8404fb2">More...</a><br /></td></tr>
<tr class="separator:a17f9f894c4765e75d66b5b2fc8404fb2"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a19bdd8733bf4ffdec688367c77f7befa"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#a19bdd8733bf4ffdec688367c77f7befa">mbedtls_hmac_drbg_update</a> (<a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> *ctx, const unsigned char *additional, size_t add_len)</td></tr>
<tr class="memdesc:a19bdd8733bf4ffdec688367c77f7befa"><td class="mdescLeft"> </td><td class="mdescRight">HMAC_DRBG update state. <a href="#a19bdd8733bf4ffdec688367c77f7befa">More...</a><br /></td></tr>
<tr class="separator:a19bdd8733bf4ffdec688367c77f7befa"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a0bc680c3d03de1a82170a3831617b8cf"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#a0bc680c3d03de1a82170a3831617b8cf">mbedtls_hmac_drbg_reseed</a> (<a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> *ctx, const unsigned char *additional, size_t len)</td></tr>
<tr class="memdesc:a0bc680c3d03de1a82170a3831617b8cf"><td class="mdescLeft"> </td><td class="mdescRight">HMAC_DRBG reseeding (extracts data from entropy source) <a href="#a0bc680c3d03de1a82170a3831617b8cf">More...</a><br /></td></tr>
<tr class="separator:a0bc680c3d03de1a82170a3831617b8cf"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8829c0b3f094edf8cc144c7185536cd8"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#a8829c0b3f094edf8cc144c7185536cd8">mbedtls_hmac_drbg_random_with_add</a> (void *p_rng, unsigned char *output, size_t output_len, const unsigned char *additional, size_t add_len)</td></tr>
<tr class="memdesc:a8829c0b3f094edf8cc144c7185536cd8"><td class="mdescLeft"> </td><td class="mdescRight">HMAC_DRBG generate random with additional update input. <a href="#a8829c0b3f094edf8cc144c7185536cd8">More...</a><br /></td></tr>
<tr class="separator:a8829c0b3f094edf8cc144c7185536cd8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa66cb34019161010448c7e915a972ee6"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#aa66cb34019161010448c7e915a972ee6">mbedtls_hmac_drbg_random</a> (void *p_rng, unsigned char *output, size_t out_len)</td></tr>
<tr class="memdesc:aa66cb34019161010448c7e915a972ee6"><td class="mdescLeft"> </td><td class="mdescRight">HMAC_DRBG generate random. <a href="#aa66cb34019161010448c7e915a972ee6">More...</a><br /></td></tr>
<tr class="separator:aa66cb34019161010448c7e915a972ee6"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a41e1f127304b1228d9f134d38e200e8a"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#a41e1f127304b1228d9f134d38e200e8a">mbedtls_hmac_drbg_free</a> (<a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> *ctx)</td></tr>
<tr class="memdesc:a41e1f127304b1228d9f134d38e200e8a"><td class="mdescLeft"> </td><td class="mdescRight">Free an HMAC_DRBG context. <a href="#a41e1f127304b1228d9f134d38e200e8a">More...</a><br /></td></tr>
<tr class="separator:a41e1f127304b1228d9f134d38e200e8a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a731a0a6e28f0a8021c7e5e2dc6d515f8"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#a731a0a6e28f0a8021c7e5e2dc6d515f8">mbedtls_hmac_drbg_write_seed_file</a> (<a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> *ctx, const char *path)</td></tr>
<tr class="memdesc:a731a0a6e28f0a8021c7e5e2dc6d515f8"><td class="mdescLeft"> </td><td class="mdescRight">Write a seed file. <a href="#a731a0a6e28f0a8021c7e5e2dc6d515f8">More...</a><br /></td></tr>
<tr class="separator:a731a0a6e28f0a8021c7e5e2dc6d515f8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a07a6569e88af60efb3b567482020d9da"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#a07a6569e88af60efb3b567482020d9da">mbedtls_hmac_drbg_update_seed_file</a> (<a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> *ctx, const char *path)</td></tr>
<tr class="memdesc:a07a6569e88af60efb3b567482020d9da"><td class="mdescLeft"> </td><td class="mdescRight">Read and update a seed file. Seed is added to this instance. <a href="#a07a6569e88af60efb3b567482020d9da">More...</a><br /></td></tr>
<tr class="separator:a07a6569e88af60efb3b567482020d9da"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a40765425ba6741ed603707fa582ab3b2"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="hmac__drbg_8h.html#a40765425ba6741ed603707fa582ab3b2">mbedtls_hmac_drbg_self_test</a> (int verbose)</td></tr>
<tr class="memdesc:a40765425ba6741ed603707fa582ab3b2"><td class="mdescLeft"> </td><td class="mdescRight">Checkup routine. <a href="#a40765425ba6741ed603707fa582ab3b2">More...</a><br /></td></tr>
<tr class="separator:a40765425ba6741ed603707fa582ab3b2"><td class="memSeparator" colspan="2"> </td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>HMAC_DRBG (NIST SP 800-90A) </p>
<p class="definition">Definition in file <a class="el" href="hmac__drbg_8h_source.html">hmac_drbg.h</a>.</p>
</div><h2 class="groupheader">Macro Definition Documentation</h2>
<a id="ac384cdd999b9733a5e4a8112c4f14291"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ac384cdd999b9733a5e4a8112c4f14291">◆ </a></span>MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED</h2>
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<td class="memname">#define MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED   -0x0009</td>
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<p>The entropy source failed. </p>
<p class="definition">Definition at line <a class="el" href="hmac__drbg_8h_source.html#l00039">39</a> of file <a class="el" href="hmac__drbg_8h_source.html">hmac_drbg.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ae5ccb23af2f8faf60deb292208af66f7">◆ </a></span>MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR</h2>
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<td class="memname">#define MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR   -0x0007</td>
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<p>Read/write error in file. </p>
<p class="definition">Definition at line <a class="el" href="hmac__drbg_8h_source.html#l00038">38</a> of file <a class="el" href="hmac__drbg_8h_source.html">hmac_drbg.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a0afd76b63cb8715577ba44de755af1fe">◆ </a></span>MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG</h2>
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<td class="memname">#define MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG   -0x0005</td>
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<p>Input too large (Entropy + additional). </p>
<p class="definition">Definition at line <a class="el" href="hmac__drbg_8h_source.html#l00037">37</a> of file <a class="el" href="hmac__drbg_8h_source.html">hmac_drbg.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a9b2cc8521b7ac670ecf41c3788b0d847">◆ </a></span>MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG</h2>
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<td class="memname">#define MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG   -0x0003</td>
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<p>Too many random requested in single call. </p>
<p class="definition">Definition at line <a class="el" href="hmac__drbg_8h_source.html#l00036">36</a> of file <a class="el" href="hmac__drbg_8h_source.html">hmac_drbg.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a10b5abc1576c6a9fa766ce1e01d6e54f">◆ </a></span>MBEDTLS_HMAC_DRBG_MAX_INPUT</h2>
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<td class="memname">#define MBEDTLS_HMAC_DRBG_MAX_INPUT   256</td>
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<p>Maximum number of additional input bytes </p>
<p class="definition">Definition at line <a class="el" href="hmac__drbg_8h_source.html#l00054">54</a> of file <a class="el" href="hmac__drbg_8h_source.html">hmac_drbg.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a3d3785a3eef7b56ca25df77a3912fbb4">◆ </a></span>MBEDTLS_HMAC_DRBG_MAX_REQUEST</h2>
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<td class="memname">#define MBEDTLS_HMAC_DRBG_MAX_REQUEST   1024</td>
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<p>Maximum number of requested bytes per call </p>
<p class="definition">Definition at line <a class="el" href="hmac__drbg_8h_source.html#l00058">58</a> of file <a class="el" href="hmac__drbg_8h_source.html">hmac_drbg.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a8d52d7d5113feb2f54eda19dfd97a942">◆ </a></span>MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT</h2>
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<td class="memname">#define MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT   384</td>
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<p>Maximum size of (re)seed buffer </p>
<p class="definition">Definition at line <a class="el" href="hmac__drbg_8h_source.html#l00062">62</a> of file <a class="el" href="hmac__drbg_8h_source.html">hmac_drbg.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#acbb59dffae4915b9a17142aaed752c57">◆ </a></span>MBEDTLS_HMAC_DRBG_PR_OFF</h2>
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<td class="memname">#define MBEDTLS_HMAC_DRBG_PR_OFF   0</td>
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<p>No prediction resistance </p>
<p class="definition">Definition at line <a class="el" href="hmac__drbg_8h_source.html#l00067">67</a> of file <a class="el" href="hmac__drbg_8h_source.html">hmac_drbg.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ac8c4bb0b84fb1c848cdb5fa240ef5e22">◆ </a></span>MBEDTLS_HMAC_DRBG_PR_ON</h2>
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<td class="memname">#define MBEDTLS_HMAC_DRBG_PR_ON   1</td>
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<p>Prediction resistance enabled </p>
<p class="definition">Definition at line <a class="el" href="hmac__drbg_8h_source.html#l00068">68</a> of file <a class="el" href="hmac__drbg_8h_source.html">hmac_drbg.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#aa7b7ad2ef442817cc4d48909c39a97e0">◆ </a></span>MBEDTLS_HMAC_DRBG_RESEED_INTERVAL</h2>
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<td class="memname">#define MBEDTLS_HMAC_DRBG_RESEED_INTERVAL   10000</td>
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<p>Interval before reseed is performed by default </p>
<p class="definition">Definition at line <a class="el" href="hmac__drbg_8h_source.html#l00050">50</a> of file <a class="el" href="hmac__drbg_8h_source.html">hmac_drbg.h</a>.</p>
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<h2 class="groupheader">Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a41e1f127304b1228d9f134d38e200e8a">◆ </a></span>mbedtls_hmac_drbg_free()</h2>
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<td class="memname">void mbedtls_hmac_drbg_free </td>
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<td class="paramtype"><a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> * </td>
<td class="paramname"><em>ctx</em></td><td>)</td>
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<p>Free an HMAC_DRBG context. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">ctx</td><td>HMAC_DRBG context to free. </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#a10881c328300a9ddb7cd5fe359c18acd">◆ </a></span>mbedtls_hmac_drbg_init()</h2>
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<td class="memname">void mbedtls_hmac_drbg_init </td>
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<td class="paramtype"><a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> * </td>
<td class="paramname"><em>ctx</em></td><td>)</td>
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<p>HMAC_DRBG context initialization Makes the context ready for <a class="el" href="hmac__drbg_8h.html#a0af34e5c68f15dfe714b5da94bce8f74" title="HMAC_DRBG initial seeding Seed and setup entropy source for future reseeds. ">mbedtls_hmac_drbg_seed()</a>, <a class="el" href="hmac__drbg_8h.html#a45cb3ab23ff6058a4e14f4140ca9f0f4" title="Initilisation of simpified HMAC_DRBG (never reseeds). (For use with deterministic ECDSA...">mbedtls_hmac_drbg_seed_buf()</a> or <a class="el" href="hmac__drbg_8h.html#a41e1f127304b1228d9f134d38e200e8a" title="Free an HMAC_DRBG context. ">mbedtls_hmac_drbg_free()</a>. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">ctx</td><td>HMAC_DRBG context to be initialized </td></tr>
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</dd>
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<h2 class="memtitle"><span class="permalink"><a href="#aa66cb34019161010448c7e915a972ee6">◆ </a></span>mbedtls_hmac_drbg_random()</h2>
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<td class="memname">int mbedtls_hmac_drbg_random </td>
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<td class="paramtype">unsigned char * </td>
<td class="paramname"><em>output</em>, </td>
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<td class="paramname"><em>out_len</em> </td>
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<p>HMAC_DRBG generate random. </p>
<p>Note: Automatically reseeds if reseed_counter is reached or PR is enabled.</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">p_rng</td><td>HMAC_DRBG context </td></tr>
<tr><td class="paramname">output</td><td>Buffer to fill </td></tr>
<tr><td class="paramname">out_len</td><td>Length of the buffer</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>0 if successful, or MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED, or MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a8829c0b3f094edf8cc144c7185536cd8">◆ </a></span>mbedtls_hmac_drbg_random_with_add()</h2>
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<td class="memname">int mbedtls_hmac_drbg_random_with_add </td>
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<td class="paramtype">void * </td>
<td class="paramname"><em>p_rng</em>, </td>
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<td class="paramtype">unsigned char * </td>
<td class="paramname"><em>output</em>, </td>
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<td class="paramname"><em>output_len</em>, </td>
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<td class="paramname"><em>additional</em>, </td>
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<td class="paramtype">size_t </td>
<td class="paramname"><em>add_len</em> </td>
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<p>HMAC_DRBG generate random with additional update input. </p>
<p>Note: Automatically reseeds if reseed_counter is reached or PR is enabled.</p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">p_rng</td><td>HMAC_DRBG context </td></tr>
<tr><td class="paramname">output</td><td>Buffer to fill </td></tr>
<tr><td class="paramname">output_len</td><td>Length of the buffer </td></tr>
<tr><td class="paramname">additional</td><td>Additional data to update with (can be NULL) </td></tr>
<tr><td class="paramname">add_len</td><td>Length of additional data (can be 0)</td></tr>
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</dd>
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<dl class="section return"><dt>Returns</dt><dd>0 if successful, or MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED, or MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG, or MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a0bc680c3d03de1a82170a3831617b8cf">◆ </a></span>mbedtls_hmac_drbg_reseed()</h2>
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<td class="memname">int mbedtls_hmac_drbg_reseed </td>
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<td class="paramtype"><a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> * </td>
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<td class="paramname"><em>len</em> </td>
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<p>HMAC_DRBG reseeding (extracts data from entropy source) </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">ctx</td><td>HMAC_DRBG context </td></tr>
<tr><td class="paramname">additional</td><td>Additional data to add to state (Can be NULL) </td></tr>
<tr><td class="paramname">len</td><td>Length of additional data</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>0 if successful, or MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a0af34e5c68f15dfe714b5da94bce8f74">◆ </a></span>mbedtls_hmac_drbg_seed()</h2>
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<td class="memname">int mbedtls_hmac_drbg_seed </td>
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<td class="paramtype"><a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> * </td>
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<td class="paramtype">const <a class="el" href="md_8h.html#a496e73a6f229eba89b4abd9955822adb">mbedtls_md_info_t</a> * </td>
<td class="paramname"><em>md_info</em>, </td>
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<td class="paramtype">int(*)(void *, unsigned char *, size_t) </td>
<td class="paramname"><em>f_entropy</em>, </td>
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<td class="paramtype">void * </td>
<td class="paramname"><em>p_entropy</em>, </td>
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<td class="paramtype">size_t </td>
<td class="paramname"><em>len</em> </td>
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<p>HMAC_DRBG initial seeding Seed and setup entropy source for future reseeds. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">ctx</td><td>HMAC_DRBG context to be seeded </td></tr>
<tr><td class="paramname">md_info</td><td>MD algorithm to use for HMAC_DRBG </td></tr>
<tr><td class="paramname">f_entropy</td><td>Entropy callback (p_entropy, buffer to fill, buffer length) </td></tr>
<tr><td class="paramname">p_entropy</td><td>Entropy context </td></tr>
<tr><td class="paramname">custom</td><td>Personalization data (Device specific identifiers) (Can be NULL) </td></tr>
<tr><td class="paramname">len</td><td>Length of personalization data</td></tr>
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</dd>
</dl>
<dl class="section note"><dt>Note</dt><dd>The "security strength" as defined by NIST is set to: 128 bits if md_alg is SHA-1, 192 bits if md_alg is SHA-224, 256 bits if md_alg is SHA-256 or higher. Note that SHA-256 is just as efficient as SHA-224.</dd></dl>
<dl class="section return"><dt>Returns</dt><dd>0 if successful, or MBEDTLS_ERR_MD_BAD_INPUT_DATA, or MBEDTLS_ERR_MD_ALLOC_FAILED, or MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a45cb3ab23ff6058a4e14f4140ca9f0f4">◆ </a></span>mbedtls_hmac_drbg_seed_buf()</h2>
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<td class="memname">int mbedtls_hmac_drbg_seed_buf </td>
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<td class="paramtype"><a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> * </td>
<td class="paramname"><em>ctx</em>, </td>
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<td class="paramtype">const <a class="el" href="md_8h.html#a496e73a6f229eba89b4abd9955822adb">mbedtls_md_info_t</a> * </td>
<td class="paramname"><em>md_info</em>, </td>
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<td class="paramtype">const unsigned char * </td>
<td class="paramname"><em>data</em>, </td>
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<td class="paramtype">size_t </td>
<td class="paramname"><em>data_len</em> </td>
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<p>Initilisation of simpified HMAC_DRBG (never reseeds). (For use with deterministic ECDSA.) </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>HMAC_DRBG context to be initialised </td></tr>
<tr><td class="paramname">md_info</td><td>MD algorithm to use for HMAC_DRBG </td></tr>
<tr><td class="paramname">data</td><td>Concatenation of entropy string and additional data </td></tr>
<tr><td class="paramname">data_len</td><td>Length of data in bytes</td></tr>
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</dd>
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<dl class="section return"><dt>Returns</dt><dd>0 if successful, or MBEDTLS_ERR_MD_BAD_INPUT_DATA, or MBEDTLS_ERR_MD_ALLOC_FAILED. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a40765425ba6741ed603707fa582ab3b2">◆ </a></span>mbedtls_hmac_drbg_self_test()</h2>
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<td class="memname">int mbedtls_hmac_drbg_self_test </td>
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<td class="paramtype">int </td>
<td class="paramname"><em>verbose</em></td><td>)</td>
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<p>Checkup routine. </p>
<dl class="section return"><dt>Returns</dt><dd>0 if successful, or 1 if the test failed </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a6a396cfe0ab81e07dd676ff75163b474">◆ </a></span>mbedtls_hmac_drbg_set_entropy_len()</h2>
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<td class="memname">void mbedtls_hmac_drbg_set_entropy_len </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> * </td>
<td class="paramname"><em>ctx</em>, </td>
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<td class="paramtype">size_t </td>
<td class="paramname"><em>len</em> </td>
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<p>Set the amount of entropy grabbed on each reseed (Default: given by the security strength, which depends on the hash used, see <code><a class="el" href="hmac__drbg_8h.html#a10881c328300a9ddb7cd5fe359c18acd" title="HMAC_DRBG context initialization Makes the context ready for mbedtls_hmac_drbg_seed(), mbedtls_hmac_drbg_seed_buf() or mbedtls_hmac_drbg_free(). ">mbedtls_hmac_drbg_init()</a></code> ) </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>HMAC_DRBG context </td></tr>
<tr><td class="paramname">len</td><td>Amount of entropy to grab, in bytes </td></tr>
</table>
</dd>
</dl>
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<a id="a0a874c42e24bd02c9805be58b3f04083"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a0a874c42e24bd02c9805be58b3f04083">◆ </a></span>mbedtls_hmac_drbg_set_prediction_resistance()</h2>
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<td class="memname">void mbedtls_hmac_drbg_set_prediction_resistance </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> * </td>
<td class="paramname"><em>ctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>resistance</em> </td>
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<p>Enable / disable prediction resistance (Default: Off) </p>
<p>Note: If enabled, entropy is used for ctx->entropy_len before each call! Only use this if you have ample supply of good entropy!</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>HMAC_DRBG context </td></tr>
<tr><td class="paramname">resistance</td><td>MBEDTLS_HMAC_DRBG_PR_ON or MBEDTLS_HMAC_DRBG_PR_OFF </td></tr>
</table>
</dd>
</dl>
</div>
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<a id="a17f9f894c4765e75d66b5b2fc8404fb2"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a17f9f894c4765e75d66b5b2fc8404fb2">◆ </a></span>mbedtls_hmac_drbg_set_reseed_interval()</h2>
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<td class="memname">void mbedtls_hmac_drbg_set_reseed_interval </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> * </td>
<td class="paramname"><em>ctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>interval</em> </td>
</tr>
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<td></td>
<td>)</td>
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<p>Set the reseed interval (Default: MBEDTLS_HMAC_DRBG_RESEED_INTERVAL) </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>HMAC_DRBG context </td></tr>
<tr><td class="paramname">interval</td><td>Reseed interval </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a id="a19bdd8733bf4ffdec688367c77f7befa"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a19bdd8733bf4ffdec688367c77f7befa">◆ </a></span>mbedtls_hmac_drbg_update()</h2>
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<td class="memname">void mbedtls_hmac_drbg_update </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> * </td>
<td class="paramname"><em>ctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const unsigned char * </td>
<td class="paramname"><em>additional</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>add_len</em> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td>
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<p>HMAC_DRBG update state. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>HMAC_DRBG context </td></tr>
<tr><td class="paramname">additional</td><td>Additional data to update state with, or NULL </td></tr>
<tr><td class="paramname">add_len</td><td>Length of additional data, or 0</td></tr>
</table>
</dd>
</dl>
<dl class="section note"><dt>Note</dt><dd>Additional data is optional, pass NULL and 0 as second third argument if no additional data is being used. </dd></dl>
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<a id="a07a6569e88af60efb3b567482020d9da"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a07a6569e88af60efb3b567482020d9da">◆ </a></span>mbedtls_hmac_drbg_update_seed_file()</h2>
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<td class="memname">int mbedtls_hmac_drbg_update_seed_file </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> * </td>
<td class="paramname"><em>ctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>path</em> </td>
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<td></td>
<td>)</td>
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<p>Read and update a seed file. Seed is added to this instance. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>HMAC_DRBG context </td></tr>
<tr><td class="paramname">path</td><td>Name of the file</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 if successful, 1 on file error, MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED or MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG </dd></dl>
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<a id="a731a0a6e28f0a8021c7e5e2dc6d515f8"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a731a0a6e28f0a8021c7e5e2dc6d515f8">◆ </a></span>mbedtls_hmac_drbg_write_seed_file()</h2>
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<td class="memname">int mbedtls_hmac_drbg_write_seed_file </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structmbedtls__hmac__drbg__context.html">mbedtls_hmac_drbg_context</a> * </td>
<td class="paramname"><em>ctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>path</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
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<p>Write a seed file. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>HMAC_DRBG context </td></tr>
<tr><td class="paramname">path</td><td>Name of the file</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 if successful, 1 on file error, or MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED </dd></dl>
</div>
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