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<p>The Elliptic Curve Digital Signature Algorithm (ECDSA).
<a href="#details">More...</a></p>
<div class="textblock"><code>#include "<a class="el" href="ecp_8h_source.html">ecp.h</a>"</code><br />
<code>#include "<a class="el" href="md_8h_source.html">md.h</a>"</code><br />
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<p><a href="ecdsa_8h_source.html">Go to the source code of this file.</a></p>
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Macros</h2></td></tr>
<tr class="memitem:aeb07d11aef4d847c5cc5cfba49547136"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#aeb07d11aef4d847c5cc5cfba49547136">MBEDTLS_ECDSA_MAX_LEN</a>   ( 3 + 2 * ( 3 + <a class="el" href="ecp_8h.html#aba9fdfc8a8dd423182616e5708abf607">MBEDTLS_ECP_MAX_BYTES</a> ) )</td></tr>
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<tr class="memitem:aa9f53b232ef244efb301233d111930dc"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#aa9f53b232ef244efb301233d111930dc">MBEDTLS_DEPRECATED</a></td></tr>
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Typedefs</h2></td></tr>
<tr class="memitem:a86ad4c743272c83310c20585ec7a182f"><td class="memItemLeft" align="right" valign="top">typedef <a class="el" href="structmbedtls__ecp__keypair.html">mbedtls_ecp_keypair</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#a86ad4c743272c83310c20585ec7a182f">mbedtls_ecdsa_context</a></td></tr>
<tr class="memdesc:a86ad4c743272c83310c20585ec7a182f"><td class="mdescLeft"> </td><td class="mdescRight">The ECDSA context structure. <a href="#a86ad4c743272c83310c20585ec7a182f">More...</a><br /></td></tr>
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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:af10f6fda2169862871d0ac07555c8641"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#af10f6fda2169862871d0ac07555c8641">mbedtls_ecdsa_sign</a> (<a class="el" href="structmbedtls__ecp__group.html">mbedtls_ecp_group</a> *grp, <a class="el" href="structmbedtls__mpi.html">mbedtls_mpi</a> *r, <a class="el" href="structmbedtls__mpi.html">mbedtls_mpi</a> *s, const <a class="el" href="structmbedtls__mpi.html">mbedtls_mpi</a> *d, const unsigned char *buf, size_t blen, int(*f_rng)(void *, unsigned char *, size_t), void *p_rng)</td></tr>
<tr class="memdesc:af10f6fda2169862871d0ac07555c8641"><td class="mdescLeft"> </td><td class="mdescRight">This function computes the ECDSA signature of a previously-hashed message. <a href="#af10f6fda2169862871d0ac07555c8641">More...</a><br /></td></tr>
<tr class="separator:af10f6fda2169862871d0ac07555c8641"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a381af8cc9ab0146a4cf1ba5226c81a8f"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#a381af8cc9ab0146a4cf1ba5226c81a8f">mbedtls_ecdsa_sign_det</a> (<a class="el" href="structmbedtls__ecp__group.html">mbedtls_ecp_group</a> *grp, <a class="el" href="structmbedtls__mpi.html">mbedtls_mpi</a> *r, <a class="el" href="structmbedtls__mpi.html">mbedtls_mpi</a> *s, const <a class="el" href="structmbedtls__mpi.html">mbedtls_mpi</a> *d, const unsigned char *buf, size_t blen, <a class="el" href="md_8h.html#a219313cb40503ec3e34a857ab98b2296">mbedtls_md_type_t</a> md_alg)</td></tr>
<tr class="memdesc:a381af8cc9ab0146a4cf1ba5226c81a8f"><td class="mdescLeft"> </td><td class="mdescRight">This function computes the ECDSA signature of a previously-hashed message, deterministic version. For more information, see <em>RFC-6979: Deterministic Usage of the Digital Signature Algorithm (DSA) and Elliptic Curve Digital Signature Algorithm (ECDSA)</em>. <a href="#a381af8cc9ab0146a4cf1ba5226c81a8f">More...</a><br /></td></tr>
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<tr class="memitem:a2292032f359fda59a7fd14911cc56f38"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#a2292032f359fda59a7fd14911cc56f38">mbedtls_ecdsa_verify</a> (<a class="el" href="structmbedtls__ecp__group.html">mbedtls_ecp_group</a> *grp, const unsigned char *buf, size_t blen, const <a class="el" href="structmbedtls__ecp__point.html">mbedtls_ecp_point</a> *Q, const <a class="el" href="structmbedtls__mpi.html">mbedtls_mpi</a> *r, const <a class="el" href="structmbedtls__mpi.html">mbedtls_mpi</a> *s)</td></tr>
<tr class="memdesc:a2292032f359fda59a7fd14911cc56f38"><td class="mdescLeft"> </td><td class="mdescRight">This function verifies the ECDSA signature of a previously-hashed message. <a href="#a2292032f359fda59a7fd14911cc56f38">More...</a><br /></td></tr>
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<tr class="memitem:a76da70289de1f746ad9cce1eadf7b135"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#a76da70289de1f746ad9cce1eadf7b135">mbedtls_ecdsa_write_signature</a> (<a class="el" href="ecdsa_8h.html#a86ad4c743272c83310c20585ec7a182f">mbedtls_ecdsa_context</a> *ctx, <a class="el" href="md_8h.html#a219313cb40503ec3e34a857ab98b2296">mbedtls_md_type_t</a> md_alg, const unsigned char *hash, size_t hlen, unsigned char *sig, size_t *slen, int(*f_rng)(void *, unsigned char *, size_t), void *p_rng)</td></tr>
<tr class="memdesc:a76da70289de1f746ad9cce1eadf7b135"><td class="mdescLeft"> </td><td class="mdescRight">This function computes the ECDSA signature and writes it to a buffer, serialized as defined in <em>RFC-4492: Elliptic Curve Cryptography (ECC) Cipher Suites for Transport Layer Security (TLS)</em>. <a href="#a76da70289de1f746ad9cce1eadf7b135">More...</a><br /></td></tr>
<tr class="separator:a76da70289de1f746ad9cce1eadf7b135"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a3827a7cf6502530e831e0bb1fcfdd5d8"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#a3827a7cf6502530e831e0bb1fcfdd5d8">mbedtls_ecdsa_write_signature_det</a> (<a class="el" href="ecdsa_8h.html#a86ad4c743272c83310c20585ec7a182f">mbedtls_ecdsa_context</a> *ctx, const unsigned char *hash, size_t hlen, unsigned char *sig, size_t *slen, <a class="el" href="md_8h.html#a219313cb40503ec3e34a857ab98b2296">mbedtls_md_type_t</a> md_alg) <a class="el" href="ssl_8h.html#aa9f53b232ef244efb301233d111930dc">MBEDTLS_DEPRECATED</a></td></tr>
<tr class="memdesc:a3827a7cf6502530e831e0bb1fcfdd5d8"><td class="mdescLeft"> </td><td class="mdescRight">This function computes an ECDSA signature and writes it to a buffer, serialized as defined in <em>RFC-4492: Elliptic Curve Cryptography (ECC) Cipher Suites for Transport Layer Security (TLS)</em>. <a href="#a3827a7cf6502530e831e0bb1fcfdd5d8">More...</a><br /></td></tr>
<tr class="separator:a3827a7cf6502530e831e0bb1fcfdd5d8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8085ade3e127118aa615f65cb1d393d5"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#a8085ade3e127118aa615f65cb1d393d5">mbedtls_ecdsa_read_signature</a> (<a class="el" href="ecdsa_8h.html#a86ad4c743272c83310c20585ec7a182f">mbedtls_ecdsa_context</a> *ctx, const unsigned char *hash, size_t hlen, const unsigned char *sig, size_t slen)</td></tr>
<tr class="memdesc:a8085ade3e127118aa615f65cb1d393d5"><td class="mdescLeft"> </td><td class="mdescRight">This function reads and verifies an ECDSA signature. <a href="#a8085ade3e127118aa615f65cb1d393d5">More...</a><br /></td></tr>
<tr class="separator:a8085ade3e127118aa615f65cb1d393d5"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ab909bd06650e761e9fd176a86bd1ce17"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#ab909bd06650e761e9fd176a86bd1ce17">mbedtls_ecdsa_genkey</a> (<a class="el" href="ecdsa_8h.html#a86ad4c743272c83310c20585ec7a182f">mbedtls_ecdsa_context</a> *ctx, <a class="el" href="ecp_8h.html#af79e530ea8f8416480f805baa20b1a2d">mbedtls_ecp_group_id</a> gid, int(*f_rng)(void *, unsigned char *, size_t), void *p_rng)</td></tr>
<tr class="memdesc:ab909bd06650e761e9fd176a86bd1ce17"><td class="mdescLeft"> </td><td class="mdescRight">This function generates an ECDSA keypair on the given curve. <a href="#ab909bd06650e761e9fd176a86bd1ce17">More...</a><br /></td></tr>
<tr class="separator:ab909bd06650e761e9fd176a86bd1ce17"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a6de8efd872cfe1bc2ee93b4a5584226c"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#a6de8efd872cfe1bc2ee93b4a5584226c">mbedtls_ecdsa_from_keypair</a> (<a class="el" href="ecdsa_8h.html#a86ad4c743272c83310c20585ec7a182f">mbedtls_ecdsa_context</a> *ctx, const <a class="el" href="structmbedtls__ecp__keypair.html">mbedtls_ecp_keypair</a> *key)</td></tr>
<tr class="memdesc:a6de8efd872cfe1bc2ee93b4a5584226c"><td class="mdescLeft"> </td><td class="mdescRight">This function sets an ECDSA context from an EC key pair. <a href="#a6de8efd872cfe1bc2ee93b4a5584226c">More...</a><br /></td></tr>
<tr class="separator:a6de8efd872cfe1bc2ee93b4a5584226c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aca644ee02921388fdc42eb06377f4b62"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#aca644ee02921388fdc42eb06377f4b62">mbedtls_ecdsa_init</a> (<a class="el" href="ecdsa_8h.html#a86ad4c743272c83310c20585ec7a182f">mbedtls_ecdsa_context</a> *ctx)</td></tr>
<tr class="memdesc:aca644ee02921388fdc42eb06377f4b62"><td class="mdescLeft"> </td><td class="mdescRight">This function initializes an ECDSA context. <a href="#aca644ee02921388fdc42eb06377f4b62">More...</a><br /></td></tr>
<tr class="separator:aca644ee02921388fdc42eb06377f4b62"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a28dd93cb376a51cce39f062858c1c186"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#a28dd93cb376a51cce39f062858c1c186">mbedtls_ecdsa_free</a> (<a class="el" href="ecdsa_8h.html#a86ad4c743272c83310c20585ec7a182f">mbedtls_ecdsa_context</a> *ctx)</td></tr>
<tr class="memdesc:a28dd93cb376a51cce39f062858c1c186"><td class="mdescLeft"> </td><td class="mdescRight">This function frees an ECDSA context. <a href="#a28dd93cb376a51cce39f062858c1c186">More...</a><br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>The Elliptic Curve Digital Signature Algorithm (ECDSA). </p>
<p>ECDSA is defined in <em>Standards for Efficient Cryptography Group (SECG): SEC1 Elliptic Curve Cryptography</em>. The use of ECDSA for TLS is defined in <em>RFC-4492: Elliptic Curve Cryptography (ECC) Cipher Suites for Transport Layer Security (TLS)</em>. </p>
<p class="definition">Definition in file <a class="el" href="ecdsa_8h_source.html">ecdsa.h</a>.</p>
</div><h2 class="groupheader">Macro Definition Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#aa9f53b232ef244efb301233d111930dc">◆ </a></span>MBEDTLS_DEPRECATED</h2>
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<td class="memname">#define MBEDTLS_DEPRECATED</td>
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<p class="definition">Definition at line <a class="el" href="ecdsa_8h_source.html#l00209">209</a> of file <a class="el" href="ecdsa_8h_source.html">ecdsa.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#aeb07d11aef4d847c5cc5cfba49547136">◆ </a></span>MBEDTLS_ECDSA_MAX_LEN</h2>
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<td class="memname">#define MBEDTLS_ECDSA_MAX_LEN   ( 3 + 2 * ( 3 + <a class="el" href="ecp_8h.html#aba9fdfc8a8dd423182616e5708abf607">MBEDTLS_ECP_MAX_BYTES</a> ) )</td>
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<p>The maximal size of an ECDSA signature in Bytes. </p>
<p class="definition">Definition at line <a class="el" href="ecdsa_8h_source.html#l00055">55</a> of file <a class="el" href="ecdsa_8h_source.html">ecdsa.h</a>.</p>
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<h2 class="groupheader">Typedef Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a86ad4c743272c83310c20585ec7a182f">◆ </a></span>mbedtls_ecdsa_context</h2>
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<td class="memname">typedef <a class="el" href="structmbedtls__ecp__keypair.html">mbedtls_ecp_keypair</a> <a class="el" href="ecdsa_8h.html#a86ad4c743272c83310c20585ec7a182f">mbedtls_ecdsa_context</a></td>
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<p>The ECDSA context structure. </p>
<p class="definition">Definition at line <a class="el" href="ecdsa_8h_source.html#l00060">60</a> of file <a class="el" href="ecdsa_8h_source.html">ecdsa.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="#a28dd93cb376a51cce39f062858c1c186">◆ </a></span>mbedtls_ecdsa_free()</h2>
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<td class="memname">void mbedtls_ecdsa_free </td>
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<td class="paramtype"><a class="el" href="ecdsa_8h.html#a86ad4c743272c83310c20585ec7a182f">mbedtls_ecdsa_context</a> * </td>
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<p>This function frees an ECDSA context. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">ctx</td><td>The ECDSA context to free. </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#a6de8efd872cfe1bc2ee93b4a5584226c">◆ </a></span>mbedtls_ecdsa_from_keypair()</h2>
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<td class="memname">int mbedtls_ecdsa_from_keypair </td>
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<p>This function sets an ECDSA context from an EC key pair. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">ctx</td><td>The ECDSA context to set. </td></tr>
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<dl class="section return"><dt>Returns</dt><dd><code>0</code> on success, or an <code>MBEDTLS_ERR_ECP_XXX</code> code on failure.</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="ecp_8h.html" title="Elliptic curves over GF(p) ">ecp.h</a> </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ab909bd06650e761e9fd176a86bd1ce17">◆ </a></span>mbedtls_ecdsa_genkey()</h2>
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<td class="memname">int mbedtls_ecdsa_genkey </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="ecp_8h.html#af79e530ea8f8416480f805baa20b1a2d">mbedtls_ecp_group_id</a> </td>
<td class="paramname"><em>gid</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int(*)(void *, unsigned char *, size_t) </td>
<td class="paramname"><em>f_rng</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"><em>p_rng</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>This function generates an ECDSA keypair on the given curve. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>The ECDSA context to store the keypair in. </td></tr>
<tr><td class="paramname">gid</td><td>The elliptic curve to use. One of the various <code>MBEDTLS_ECP_DP_XXX</code> macros depending on configuration. </td></tr>
<tr><td class="paramname">f_rng</td><td>The RNG function. </td></tr>
<tr><td class="paramname">p_rng</td><td>The RNG parameter.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><code>0</code> on success, or an <code>MBEDTLS_ERR_ECP_XXX</code> code on failure.</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="ecp_8h.html" title="Elliptic curves over GF(p) ">ecp.h</a> </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#aca644ee02921388fdc42eb06377f4b62">◆ </a></span>mbedtls_ecdsa_init()</h2>
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<td class="memname">void mbedtls_ecdsa_init </td>
<td>(</td>
<td class="paramtype"><a class="el" href="ecdsa_8h.html#a86ad4c743272c83310c20585ec7a182f">mbedtls_ecdsa_context</a> * </td>
<td class="paramname"><em>ctx</em></td><td>)</td>
<td></td>
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<p>This function initializes an ECDSA context. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>The ECDSA context to initialize. </td></tr>
</table>
</dd>
</dl>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a8085ade3e127118aa615f65cb1d393d5">◆ </a></span>mbedtls_ecdsa_read_signature()</h2>
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<td class="memname">int mbedtls_ecdsa_read_signature </td>
<td>(</td>
<td class="paramtype"><a class="el" href="ecdsa_8h.html#a86ad4c743272c83310c20585ec7a182f">mbedtls_ecdsa_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>hash</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>hlen</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const unsigned char * </td>
<td class="paramname"><em>sig</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>slen</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>This function reads and verifies an ECDSA signature. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>The ECDSA context. </td></tr>
<tr><td class="paramname">hash</td><td>The message hash. </td></tr>
<tr><td class="paramname">hlen</td><td>The size of the hash. </td></tr>
<tr><td class="paramname">sig</td><td>The signature to read and verify. </td></tr>
<tr><td class="paramname">slen</td><td>The size of <code>sig</code>.</td></tr>
</table>
</dd>
</dl>
<dl class="section note"><dt>Note</dt><dd>If the bitlength of the message hash is larger than the bitlength of the group order, then the hash is truncated as defined in <em>Standards for Efficient Cryptography Group (SECG): SEC1 Elliptic Curve Cryptography</em>, section 4.1.4, step 3.</dd></dl>
<dl class="section return"><dt>Returns</dt><dd><code>0</code> on success, <a class="el" href="ecp_8h.html#abcd6ff5c88f83a731383d344b56131f3">MBEDTLS_ERR_ECP_BAD_INPUT_DATA</a> if signature is invalid, <a class="el" href="ecp_8h.html#a49d1dece5c167d28f22702cfc11b9aa1">MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH</a> if there is a valid signature in sig but its length is less than <code>siglen</code>, or an <code>MBEDTLS_ERR_ECP_XXX</code> or <code>MBEDTLS_ERR_MPI_XXX</code> error code on failure for any other reason.</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="ecp_8h.html" title="Elliptic curves over GF(p) ">ecp.h</a> </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#af10f6fda2169862871d0ac07555c8641">◆ </a></span>mbedtls_ecdsa_sign()</h2>
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<td class="memname">int mbedtls_ecdsa_sign </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structmbedtls__ecp__group.html">mbedtls_ecp_group</a> * </td>
<td class="paramname"><em>grp</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structmbedtls__mpi.html">mbedtls_mpi</a> * </td>
<td class="paramname"><em>r</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structmbedtls__mpi.html">mbedtls_mpi</a> * </td>
<td class="paramname"><em>s</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="structmbedtls__mpi.html">mbedtls_mpi</a> * </td>
<td class="paramname"><em>d</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const unsigned char * </td>
<td class="paramname"><em>buf</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>blen</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int(*)(void *, unsigned char *, size_t) </td>
<td class="paramname"><em>f_rng</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"><em>p_rng</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>This function computes the ECDSA signature of a previously-hashed message. </p>
<dl class="section note"><dt>Note</dt><dd>The deterministic version is usually preferred.</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">grp</td><td>The ECP group. </td></tr>
<tr><td class="paramname">r</td><td>The first output integer. </td></tr>
<tr><td class="paramname">s</td><td>The second output integer. </td></tr>
<tr><td class="paramname">d</td><td>The private signing key. </td></tr>
<tr><td class="paramname">buf</td><td>The message hash. </td></tr>
<tr><td class="paramname">blen</td><td>The length of <code>buf</code>. </td></tr>
<tr><td class="paramname">f_rng</td><td>The RNG function. </td></tr>
<tr><td class="paramname">p_rng</td><td>The RNG parameter.</td></tr>
</table>
</dd>
</dl>
<dl class="section note"><dt>Note</dt><dd>If the bitlength of the message hash is larger than the bitlength of the group order, then the hash is truncated as defined in <em>Standards for Efficient Cryptography Group (SECG): SEC1 Elliptic Curve Cryptography</em>, section 4.1.3, step 5.</dd></dl>
<dl class="section return"><dt>Returns</dt><dd><code>0</code> on success, or an <code>MBEDTLS_ERR_ECP_XXX</code> or <code>MBEDTLS_MPI_XXX</code> error code on failure.</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="ecp_8h.html" title="Elliptic curves over GF(p) ">ecp.h</a> </dd></dl>
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<a id="a381af8cc9ab0146a4cf1ba5226c81a8f"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a381af8cc9ab0146a4cf1ba5226c81a8f">◆ </a></span>mbedtls_ecdsa_sign_det()</h2>
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<td class="memname">int mbedtls_ecdsa_sign_det </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structmbedtls__ecp__group.html">mbedtls_ecp_group</a> * </td>
<td class="paramname"><em>grp</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structmbedtls__mpi.html">mbedtls_mpi</a> * </td>
<td class="paramname"><em>r</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structmbedtls__mpi.html">mbedtls_mpi</a> * </td>
<td class="paramname"><em>s</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="structmbedtls__mpi.html">mbedtls_mpi</a> * </td>
<td class="paramname"><em>d</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const unsigned char * </td>
<td class="paramname"><em>buf</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>blen</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="md_8h.html#a219313cb40503ec3e34a857ab98b2296">mbedtls_md_type_t</a> </td>
<td class="paramname"><em>md_alg</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>This function computes the ECDSA signature of a previously-hashed message, deterministic version. For more information, see <em>RFC-6979: Deterministic Usage of the Digital Signature Algorithm (DSA) and Elliptic Curve Digital Signature Algorithm (ECDSA)</em>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">grp</td><td>The ECP group. </td></tr>
<tr><td class="paramname">r</td><td>The first output integer. </td></tr>
<tr><td class="paramname">s</td><td>The second output integer. </td></tr>
<tr><td class="paramname">d</td><td>The private signing key. </td></tr>
<tr><td class="paramname">buf</td><td>The message hash. </td></tr>
<tr><td class="paramname">blen</td><td>The length of <code>buf</code>. </td></tr>
<tr><td class="paramname">md_alg</td><td>The MD algorithm used to hash the message.</td></tr>
</table>
</dd>
</dl>
<dl class="section note"><dt>Note</dt><dd>If the bitlength of the message hash is larger than the bitlength of the group order, then the hash is truncated as defined in <em>Standards for Efficient Cryptography Group (SECG): SEC1 Elliptic Curve Cryptography</em>, section 4.1.3, step 5.</dd></dl>
<dl class="section return"><dt>Returns</dt><dd><code>0</code> on success, or an <code>MBEDTLS_ERR_ECP_XXX</code> or <code>MBEDTLS_MPI_XXX</code> error code on failure.</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="ecp_8h.html" title="Elliptic curves over GF(p) ">ecp.h</a> </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a2292032f359fda59a7fd14911cc56f38">◆ </a></span>mbedtls_ecdsa_verify()</h2>
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<td class="memname">int mbedtls_ecdsa_verify </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structmbedtls__ecp__group.html">mbedtls_ecp_group</a> * </td>
<td class="paramname"><em>grp</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const unsigned char * </td>
<td class="paramname"><em>buf</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>blen</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="structmbedtls__ecp__point.html">mbedtls_ecp_point</a> * </td>
<td class="paramname"><em>Q</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="structmbedtls__mpi.html">mbedtls_mpi</a> * </td>
<td class="paramname"><em>r</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="structmbedtls__mpi.html">mbedtls_mpi</a> * </td>
<td class="paramname"><em>s</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
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<p>This function verifies the ECDSA signature of a previously-hashed message. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">grp</td><td>The ECP group. </td></tr>
<tr><td class="paramname">buf</td><td>The message hash. </td></tr>
<tr><td class="paramname">blen</td><td>The length of <code>buf</code>. </td></tr>
<tr><td class="paramname">Q</td><td>The public key to use for verification. </td></tr>
<tr><td class="paramname">r</td><td>The first integer of the signature. </td></tr>
<tr><td class="paramname">s</td><td>The second integer of the signature.</td></tr>
</table>
</dd>
</dl>
<dl class="section note"><dt>Note</dt><dd>If the bitlength of the message hash is larger than the bitlength of the group order, then the hash is truncated as defined in <em>Standards for Efficient Cryptography Group (SECG): SEC1 Elliptic Curve Cryptography</em>, section 4.1.4, step 3.</dd></dl>
<dl class="section return"><dt>Returns</dt><dd><code>0</code> on success, <a class="el" href="ecp_8h.html#abcd6ff5c88f83a731383d344b56131f3">MBEDTLS_ERR_ECP_BAD_INPUT_DATA</a> if signature is invalid, or an <code>MBEDTLS_ERR_ECP_XXX</code> or <code>MBEDTLS_MPI_XXX</code> error code on failure for any other reason.</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="ecp_8h.html" title="Elliptic curves over GF(p) ">ecp.h</a> </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a76da70289de1f746ad9cce1eadf7b135">◆ </a></span>mbedtls_ecdsa_write_signature()</h2>
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<td class="memname">int mbedtls_ecdsa_write_signature </td>
<td>(</td>
<td class="paramtype"><a class="el" href="ecdsa_8h.html#a86ad4c743272c83310c20585ec7a182f">mbedtls_ecdsa_context</a> * </td>
<td class="paramname"><em>ctx</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="md_8h.html#a219313cb40503ec3e34a857ab98b2296">mbedtls_md_type_t</a> </td>
<td class="paramname"><em>md_alg</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const unsigned char * </td>
<td class="paramname"><em>hash</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>hlen</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned char * </td>
<td class="paramname"><em>sig</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t * </td>
<td class="paramname"><em>slen</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int(*)(void *, unsigned char *, size_t) </td>
<td class="paramname"><em>f_rng</em>, </td>
</tr>
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<td></td>
<td class="paramtype">void * </td>
<td class="paramname"><em>p_rng</em> </td>
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<p>This function computes the ECDSA signature and writes it to a buffer, serialized as defined in <em>RFC-4492: Elliptic Curve Cryptography (ECC) Cipher Suites for Transport Layer Security (TLS)</em>. </p>
<dl class="section warning"><dt>Warning</dt><dd>It is not thread-safe to use the same context in multiple threads.</dd></dl>
<dl class="section note"><dt>Note</dt><dd>The deterministic version is used if <a class="el" href="config_8h.html#adba50fdb786e1708b3360bd04bb77bd1">MBEDTLS_ECDSA_DETERMINISTIC</a> is defined. For more information, see <em>RFC-6979: Deterministic Usage of the Digital Signature Algorithm (DSA) and Elliptic Curve Digital Signature Algorithm (ECDSA)</em>.</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>The ECDSA context. </td></tr>
<tr><td class="paramname">md_alg</td><td>The message digest that was used to hash the message. </td></tr>
<tr><td class="paramname">hash</td><td>The message hash. </td></tr>
<tr><td class="paramname">hlen</td><td>The length of the hash. </td></tr>
<tr><td class="paramname">sig</td><td>The buffer that holds the signature. </td></tr>
<tr><td class="paramname">slen</td><td>The length of the signature written. </td></tr>
<tr><td class="paramname">f_rng</td><td>The RNG function. </td></tr>
<tr><td class="paramname">p_rng</td><td>The RNG parameter.</td></tr>
</table>
</dd>
</dl>
<dl class="section note"><dt>Note</dt><dd>The <code>sig</code> buffer must be at least twice as large as the size of the curve used, plus 9. For example, 73 Bytes if a 256-bit curve is used. A buffer length of <a class="el" href="ecdsa_8h.html#aeb07d11aef4d847c5cc5cfba49547136">MBEDTLS_ECDSA_MAX_LEN</a> is always safe.</dd>
<dd>
If the bitlength of the message hash is larger than the bitlength of the group order, then the hash is truncated as defined in <em>Standards for Efficient Cryptography Group (SECG): SEC1 Elliptic Curve Cryptography</em>, section 4.1.3, step 5.</dd></dl>
<dl class="section return"><dt>Returns</dt><dd><code>0</code> on success, or an <code>MBEDTLS_ERR_ECP_XXX</code>, <code>MBEDTLS_ERR_MPI_XXX</code> or <code>MBEDTLS_ERR_ASN1_XXX</code> error code on failure.</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="ecp_8h.html" title="Elliptic curves over GF(p) ">ecp.h</a> </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a3827a7cf6502530e831e0bb1fcfdd5d8">◆ </a></span>mbedtls_ecdsa_write_signature_det()</h2>
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<td class="memname">int mbedtls_ecdsa_write_signature_det </td>
<td>(</td>
<td class="paramtype"><a class="el" href="ecdsa_8h.html#a86ad4c743272c83310c20585ec7a182f">mbedtls_ecdsa_context</a> * </td>
<td class="paramname"><em>ctx</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const unsigned char * </td>
<td class="paramname"><em>hash</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>hlen</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned char * </td>
<td class="paramname"><em>sig</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t * </td>
<td class="paramname"><em>slen</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="md_8h.html#a219313cb40503ec3e34a857ab98b2296">mbedtls_md_type_t</a> </td>
<td class="paramname"><em>md_alg</em> </td>
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<td>)</td>
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<p>This function computes an ECDSA signature and writes it to a buffer, serialized as defined in <em>RFC-4492: Elliptic Curve Cryptography (ECC) Cipher Suites for Transport Layer Security (TLS)</em>. </p>
<p>The deterministic version is defined in <em>RFC-6979: Deterministic Usage of the Digital Signature Algorithm (DSA) and Elliptic Curve Digital Signature Algorithm (ECDSA)</em>.</p>
<dl class="section warning"><dt>Warning</dt><dd>It is not thread-safe to use the same context in multiple threads.</dd></dl>
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000007">Deprecated:</a></b></dt><dd>Superseded by <a class="el" href="ecdsa_8h.html#a76da70289de1f746ad9cce1eadf7b135" title="This function computes the ECDSA signature and writes it to a buffer, serialized as defined in RFC-44...">mbedtls_ecdsa_write_signature()</a> in 2.0.0</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>The ECDSA context. </td></tr>
<tr><td class="paramname">hash</td><td>The Message hash. </td></tr>
<tr><td class="paramname">hlen</td><td>The length of the hash. </td></tr>
<tr><td class="paramname">sig</td><td>The buffer that holds the signature. </td></tr>
<tr><td class="paramname">slen</td><td>The length of the signature written. </td></tr>
<tr><td class="paramname">md_alg</td><td>The MD algorithm used to hash the message.</td></tr>
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</dd>
</dl>
<dl class="section note"><dt>Note</dt><dd>The <code>sig</code> buffer must be at least twice as large as the size of the curve used, plus 9. For example, 73 Bytes if a 256-bit curve is used. A buffer length of <a class="el" href="ecdsa_8h.html#aeb07d11aef4d847c5cc5cfba49547136">MBEDTLS_ECDSA_MAX_LEN</a> is always safe.</dd>
<dd>
If the bitlength of the message hash is larger than the bitlength of the group order, then the hash is truncated as defined in <em>Standards for Efficient Cryptography Group (SECG): SEC1 Elliptic Curve Cryptography</em>, section 4.1.3, step 5.</dd></dl>
<dl class="section return"><dt>Returns</dt><dd><code>0</code> on success, or an <code>MBEDTLS_ERR_ECP_XXX</code>, <code>MBEDTLS_ERR_MPI_XXX</code> or <code>MBEDTLS_ERR_ASN1_XXX</code> error code on failure.</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="ecp_8h.html" title="Elliptic curves over GF(p) ">ecp.h</a> </dd></dl>
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