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<p>Elliptic curve DSA.
<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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Include dependency graph for ecdsa.h:</div>
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<div class="center"><img src="ecdsa_8h__incl.png" border="0" usemap="#ecdsa_8h" alt=""/></div>
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This graph shows which files directly or indirectly include this file:</div>
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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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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="structecdsa__context.html">ecdsa_context</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">ECDSA context structure. <a href="structecdsa__context.html#details">More...</a><br/></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </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:a5a5858bde5c49005fefbe74883fc9a9d"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#a5a5858bde5c49005fefbe74883fc9a9d">ecdsa_sign</a> (<a class="el" href="structecp__group.html">ecp_group</a> *grp, <a class="el" href="structmpi.html">mpi</a> *r, <a class="el" href="structmpi.html">mpi</a> *s, const <a class="el" href="structmpi.html">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:a5a5858bde5c49005fefbe74883fc9a9d"><td class="mdescLeft"> </td><td class="mdescRight">Compute ECDSA signature of a previously hashed message. <a href="#a5a5858bde5c49005fefbe74883fc9a9d">More...</a><br/></td></tr>
<tr class="separator:a5a5858bde5c49005fefbe74883fc9a9d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:af633a283f02fb3381354dc857a5cef43"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#af633a283f02fb3381354dc857a5cef43">ecdsa_sign_det</a> (<a class="el" href="structecp__group.html">ecp_group</a> *grp, <a class="el" href="structmpi.html">mpi</a> *r, <a class="el" href="structmpi.html">mpi</a> *s, const <a class="el" href="structmpi.html">mpi</a> *d, const unsigned char *buf, size_t blen, <a class="el" href="md_8h.html#af1fbbb67afa0daee4090cde8864e0b68">md_type_t</a> md_alg)</td></tr>
<tr class="memdesc:af633a283f02fb3381354dc857a5cef43"><td class="mdescLeft"> </td><td class="mdescRight">Compute ECDSA signature of a previously hashed message (deterministic version) <a href="#af633a283f02fb3381354dc857a5cef43">More...</a><br/></td></tr>
<tr class="separator:af633a283f02fb3381354dc857a5cef43"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a9f54b1d3ff1cef8dec1051016eace9e6"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#a9f54b1d3ff1cef8dec1051016eace9e6">ecdsa_verify</a> (<a class="el" href="structecp__group.html">ecp_group</a> *grp, const unsigned char *buf, size_t blen, const <a class="el" href="structecp__point.html">ecp_point</a> *Q, const <a class="el" href="structmpi.html">mpi</a> *r, const <a class="el" href="structmpi.html">mpi</a> *s)</td></tr>
<tr class="memdesc:a9f54b1d3ff1cef8dec1051016eace9e6"><td class="mdescLeft"> </td><td class="mdescRight">Verify ECDSA signature of a previously hashed message. <a href="#a9f54b1d3ff1cef8dec1051016eace9e6">More...</a><br/></td></tr>
<tr class="separator:a9f54b1d3ff1cef8dec1051016eace9e6"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8cadaa8ea3f8251adc2249c3108b26cc"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#a8cadaa8ea3f8251adc2249c3108b26cc">ecdsa_write_signature</a> (<a class="el" href="structecdsa__context.html">ecdsa_context</a> *ctx, 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:a8cadaa8ea3f8251adc2249c3108b26cc"><td class="mdescLeft"> </td><td class="mdescRight">Compute ECDSA signature and write it to buffer, serialized as defined in RFC 4492 page 20. <a href="#a8cadaa8ea3f8251adc2249c3108b26cc">More...</a><br/></td></tr>
<tr class="separator:a8cadaa8ea3f8251adc2249c3108b26cc"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad86d178c1aa2135f398e5a92e860dae4"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#ad86d178c1aa2135f398e5a92e860dae4">ecdsa_write_signature_det</a> (<a class="el" href="structecdsa__context.html">ecdsa_context</a> *ctx, const unsigned char *hash, size_t hlen, unsigned char *sig, size_t *slen, <a class="el" href="md_8h.html#af1fbbb67afa0daee4090cde8864e0b68">md_type_t</a> md_alg)</td></tr>
<tr class="memdesc:ad86d178c1aa2135f398e5a92e860dae4"><td class="mdescLeft"> </td><td class="mdescRight">Compute ECDSA signature and write it to buffer, serialized as defined in RFC 4492 page 20. <a href="#ad86d178c1aa2135f398e5a92e860dae4">More...</a><br/></td></tr>
<tr class="separator:ad86d178c1aa2135f398e5a92e860dae4"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a5f77f5b93fce3ef628d7f8de5bf92de8"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#a5f77f5b93fce3ef628d7f8de5bf92de8">ecdsa_read_signature</a> (<a class="el" href="structecdsa__context.html">ecdsa_context</a> *ctx, const unsigned char *hash, size_t hlen, const unsigned char *sig, size_t slen)</td></tr>
<tr class="memdesc:a5f77f5b93fce3ef628d7f8de5bf92de8"><td class="mdescLeft"> </td><td class="mdescRight">Read and verify an ECDSA signature. <a href="#a5f77f5b93fce3ef628d7f8de5bf92de8">More...</a><br/></td></tr>
<tr class="separator:a5f77f5b93fce3ef628d7f8de5bf92de8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ac394e13bb4ced90794817d9a127bc776"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#ac394e13bb4ced90794817d9a127bc776">ecdsa_genkey</a> (<a class="el" href="structecdsa__context.html">ecdsa_context</a> *ctx, <a class="el" href="ecp_8h.html#a751fce96f17826537221248b4ed5cbd2">ecp_group_id</a> gid, int(*f_rng)(void *, unsigned char *, size_t), void *p_rng)</td></tr>
<tr class="memdesc:ac394e13bb4ced90794817d9a127bc776"><td class="mdescLeft"> </td><td class="mdescRight">Generate an ECDSA keypair on the given curve. <a href="#ac394e13bb4ced90794817d9a127bc776">More...</a><br/></td></tr>
<tr class="separator:ac394e13bb4ced90794817d9a127bc776"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a186f01f0a428f017b338c43df19c3b0b"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#a186f01f0a428f017b338c43df19c3b0b">ecdsa_from_keypair</a> (<a class="el" href="structecdsa__context.html">ecdsa_context</a> *ctx, const <a class="el" href="structecp__keypair.html">ecp_keypair</a> *key)</td></tr>
<tr class="memdesc:a186f01f0a428f017b338c43df19c3b0b"><td class="mdescLeft"> </td><td class="mdescRight">Set an ECDSA context from an EC key pair. <a href="#a186f01f0a428f017b338c43df19c3b0b">More...</a><br/></td></tr>
<tr class="separator:a186f01f0a428f017b338c43df19c3b0b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a70bf12fe3c9062d5ee306378d94f8d67"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#a70bf12fe3c9062d5ee306378d94f8d67">ecdsa_init</a> (<a class="el" href="structecdsa__context.html">ecdsa_context</a> *ctx)</td></tr>
<tr class="memdesc:a70bf12fe3c9062d5ee306378d94f8d67"><td class="mdescLeft"> </td><td class="mdescRight">Initialize context. <a href="#a70bf12fe3c9062d5ee306378d94f8d67">More...</a><br/></td></tr>
<tr class="separator:a70bf12fe3c9062d5ee306378d94f8d67"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ab49abcf12ba983d101f500fd85f468da"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#ab49abcf12ba983d101f500fd85f468da">ecdsa_free</a> (<a class="el" href="structecdsa__context.html">ecdsa_context</a> *ctx)</td></tr>
<tr class="memdesc:ab49abcf12ba983d101f500fd85f468da"><td class="mdescLeft"> </td><td class="mdescRight">Free context. <a href="#ab49abcf12ba983d101f500fd85f468da">More...</a><br/></td></tr>
<tr class="separator:ab49abcf12ba983d101f500fd85f468da"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:af449415b02ec5ba96d800cbcd9d5f042"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="ecdsa_8h.html#af449415b02ec5ba96d800cbcd9d5f042">ecdsa_self_test</a> (int verbose)</td></tr>
<tr class="memdesc:af449415b02ec5ba96d800cbcd9d5f042"><td class="mdescLeft"> </td><td class="mdescRight">Checkup routine. <a href="#af449415b02ec5ba96d800cbcd9d5f042">More...</a><br/></td></tr>
<tr class="separator:af449415b02ec5ba96d800cbcd9d5f042"><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>Elliptic curve DSA. </p>
<p>Copyright (C) 2006-2013, Brainspark B.V.</p>
<p>This file is part of PolarSSL (<a href="http://www.polarssl.org">http://www.polarssl.org</a>) Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org></p>
<p>All rights reserved.</p>
<p>This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.</p>
<p>This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.</p>
<p>You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. </p>
<p>Definition in file <a class="el" href="ecdsa_8h_source.html">ecdsa.h</a>.</p>
</div><h2 class="groupheader">Function Documentation</h2>
<a class="anchor" id="ab49abcf12ba983d101f500fd85f468da"></a>
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<td class="memname">void ecdsa_free </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structecdsa__context.html">ecdsa_context</a> * </td>
<td class="paramname"><em>ctx</em></td><td>)</td>
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<p>Free context. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>Context to free </td></tr>
</table>
</dd>
</dl>
</div>
</div>
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<td class="memname">int ecdsa_from_keypair </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structecdsa__context.html">ecdsa_context</a> * </td>
<td class="paramname"><em>ctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="structecp__keypair.html">ecp_keypair</a> * </td>
<td class="paramname"><em>key</em> </td>
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<td>)</td>
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<p>Set an ECDSA context from an EC key pair. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>ECDSA context to set </td></tr>
<tr><td class="paramname">key</td><td>EC key to use</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 on success, or a POLARSSL_ERR_ECP code. </dd></dl>
</div>
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<td class="memname">int ecdsa_genkey </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structecdsa__context.html">ecdsa_context</a> * </td>
<td class="paramname"><em>ctx</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="ecp_8h.html#a751fce96f17826537221248b4ed5cbd2">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>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"><em>p_rng</em> </td>
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<td>)</td>
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<p>Generate 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>ECDSA context in which the keypair should be stored </td></tr>
<tr><td class="paramname">gid</td><td>Group (elliptic curve) to use. One of the various POLARSSL_ECP_DP_XXX macros depending on configuration. </td></tr>
<tr><td class="paramname">f_rng</td><td>RNG function </td></tr>
<tr><td class="paramname">p_rng</td><td>RNG parameter</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 on success, or a POLARSSL_ERR_ECP code. </dd></dl>
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<td class="memname">void ecdsa_init </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structecdsa__context.html">ecdsa_context</a> * </td>
<td class="paramname"><em>ctx</em></td><td>)</td>
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<p>Initialize context. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>Context to initialize </td></tr>
</table>
</dd>
</dl>
</div>
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<td class="memname">int ecdsa_read_signature </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structecdsa__context.html">ecdsa_context</a> * </td>
<td class="paramname"><em>ctx</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>
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<td class="paramkey"></td>
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<td class="paramtype">const unsigned char * </td>
<td class="paramname"><em>sig</em>, </td>
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<td class="paramtype">size_t </td>
<td class="paramname"><em>slen</em> </td>
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<p>Read and verify an ECDSA signature. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>ECDSA context </td></tr>
<tr><td class="paramname">hash</td><td>Message hash </td></tr>
<tr><td class="paramname">hlen</td><td>Size of hash </td></tr>
<tr><td class="paramname">sig</td><td>Signature to read and verify </td></tr>
<tr><td class="paramname">slen</td><td>Size of sig</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 if successful, POLARSSL_ERR_ECP_BAD_INPUT_DATA if signature is invalid, POLARSSL_ERR_ECP_SIG_LEN_MISTMATCH if the signature is valid but its actual length is less than siglen, or a POLARSSL_ERR_ECP or POLARSSL_ERR_MPI error code </dd></dl>
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<td class="memname">int ecdsa_self_test </td>
<td>(</td>
<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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<td class="memname">int ecdsa_sign </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structecp__group.html">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="structmpi.html">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="structmpi.html">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="structmpi.html">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>Compute 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>ECP group </td></tr>
<tr><td class="paramname">r</td><td>First output integer </td></tr>
<tr><td class="paramname">s</td><td>Second output integer </td></tr>
<tr><td class="paramname">d</td><td>Private signing key </td></tr>
<tr><td class="paramname">buf</td><td>Message hash </td></tr>
<tr><td class="paramname">blen</td><td>Length of buf </td></tr>
<tr><td class="paramname">f_rng</td><td>RNG function </td></tr>
<tr><td class="paramname">p_rng</td><td>RNG parameter</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 if successful, or a POLARSSL_ERR_ECP_XXX or POLARSSL_MPI_XXX error code </dd></dl>
</div>
</div>
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<div class="memproto">
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<td class="memname">int ecdsa_sign_det </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structecp__group.html">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="structmpi.html">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="structmpi.html">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="structmpi.html">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#af1fbbb67afa0daee4090cde8864e0b68">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>Compute ECDSA signature of a previously hashed message (deterministic version) </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">grp</td><td>ECP group </td></tr>
<tr><td class="paramname">r</td><td>First output integer </td></tr>
<tr><td class="paramname">s</td><td>Second output integer </td></tr>
<tr><td class="paramname">d</td><td>Private signing key </td></tr>
<tr><td class="paramname">buf</td><td>Message hash </td></tr>
<tr><td class="paramname">blen</td><td>Length of buf </td></tr>
<tr><td class="paramname">md_alg</td><td>MD algorithm used to hash the message</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 if successful, or a POLARSSL_ERR_ECP_XXX or POLARSSL_MPI_XXX error code </dd></dl>
</div>
</div>
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<td class="memname">int ecdsa_verify </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structecp__group.html">ecp_group</a> * </td>
<td class="paramname"><em>grp</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">const <a class="el" href="structecp__point.html">ecp_point</a> * </td>
<td class="paramname"><em>Q</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="structmpi.html">mpi</a> * </td>
<td class="paramname"><em>r</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="structmpi.html">mpi</a> * </td>
<td class="paramname"><em>s</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Verify 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>ECP group </td></tr>
<tr><td class="paramname">buf</td><td>Message hash </td></tr>
<tr><td class="paramname">blen</td><td>Length of buf </td></tr>
<tr><td class="paramname">Q</td><td>Public key to use for verification </td></tr>
<tr><td class="paramname">r</td><td>First integer of the signature </td></tr>
<tr><td class="paramname">s</td><td>Second integer of the signature</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 if successful, POLARSSL_ERR_ECP_BAD_INPUT_DATA if signature is invalid or a POLARSSL_ERR_ECP_XXX or POLARSSL_MPI_XXX error code </dd></dl>
</div>
</div>
<a class="anchor" id="a8cadaa8ea3f8251adc2249c3108b26cc"></a>
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<div class="memproto">
<table class="memname">
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<td class="memname">int ecdsa_write_signature </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structecdsa__context.html">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">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">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>Compute ECDSA signature and write it to buffer, serialized as defined in RFC 4492 page 20. </p>
<pre class="fragment"> (Not thread-safe to use same context in multiple threads)
</pre><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>ECDSA context </td></tr>
<tr><td class="paramname">hash</td><td>Message hash </td></tr>
<tr><td class="paramname">hlen</td><td>Length of hash </td></tr>
<tr><td class="paramname">sig</td><td>Buffer that will hold the signature </td></tr>
<tr><td class="paramname">slen</td><td>Length of the signature written </td></tr>
<tr><td class="paramname">f_rng</td><td>RNG function </td></tr>
<tr><td class="paramname">p_rng</td><td>RNG parameter</td></tr>
</table>
</dd>
</dl>
<dl class="section note"><dt>Note</dt><dd>The "sig" buffer must be at least as large as twice the size of the curve used, plus 7 (eg. 71 bytes if a 256-bit curve is used).</dd></dl>
<dl class="section return"><dt>Returns</dt><dd>0 if successful, or a POLARSSL_ERR_ECP, POLARSSL_ERR_MPI or POLARSSL_ERR_ASN1 error code </dd></dl>
</div>
</div>
<a class="anchor" id="ad86d178c1aa2135f398e5a92e860dae4"></a>
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<table class="memname">
<tr>
<td class="memname">int ecdsa_write_signature_det </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structecdsa__context.html">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">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#af1fbbb67afa0daee4090cde8864e0b68">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>Compute ECDSA signature and write it to buffer, serialized as defined in RFC 4492 page 20. </p>
<pre class="fragment"> Deterministic version, RFC 6979.
(Not thread-safe to use same context in multiple threads)
</pre><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">ctx</td><td>ECDSA context </td></tr>
<tr><td class="paramname">hash</td><td>Message hash </td></tr>
<tr><td class="paramname">hlen</td><td>Length of hash </td></tr>
<tr><td class="paramname">sig</td><td>Buffer that will hold the signature </td></tr>
<tr><td class="paramname">slen</td><td>Length of the signature written </td></tr>
<tr><td class="paramname">md_alg</td><td>MD algorithm used to hash the message</td></tr>
</table>
</dd>
</dl>
<dl class="section note"><dt>Note</dt><dd>The "sig" buffer must be at least as large as twice the size of the curve used, plus 7 (eg. 71 bytes if a 256-bit curve is used).</dd></dl>
<dl class="section return"><dt>Returns</dt><dd>0 if successful, or a POLARSSL_ERR_ECP, POLARSSL_ERR_MPI or POLARSSL_ERR_ASN1 error code </dd></dl>
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