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<div class="title">ecdsa<div class="ingroups"><a class="el" href="group___epid_module.html">epid</a> » <a class="el" href="group___epid_common.html">common</a> » <a class="el" href="group___epid_math.html">math</a></div></div> </div>
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<p>Elliptic Curve Digital Signature Algorithm Primitives.
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:gaab68de7291db6e42a01e99c2fa40057f"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___ecdsa_primitives.html#gaab68de7291db6e42a01e99c2fa40057f">EcdsaVerifyBuffer</a> (void const *buf, size_t buf_len, <a class="el" href="struct_ecdsa_public_key.html">EcdsaPublicKey</a> const *pubkey, <a class="el" href="struct_ecdsa_signature.html">EcdsaSignature</a> const *sig)</td></tr>
<tr class="memdesc:gaab68de7291db6e42a01e99c2fa40057f"><td class="mdescLeft"> </td><td class="mdescRight">Verifies authenticity of a digital signature over a buffer. <a href="#gaab68de7291db6e42a01e99c2fa40057f">More...</a><br /></td></tr>
<tr class="separator:gaab68de7291db6e42a01e99c2fa40057f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga67091ecae643c1b8a0b0a4946eda7afe"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___ecdsa_primitives.html#ga67091ecae643c1b8a0b0a4946eda7afe">EcdsaSignBuffer</a> (void const *buf, size_t buf_len, <a class="el" href="struct_ecdsa_private_key.html">EcdsaPrivateKey</a> const *privkey, <a class="el" href="group___epid_common.html#ga6119a2c0323a3fca9e502b24bc378c2c">BitSupplier</a> rnd_func, void *rnd_param, <a class="el" href="struct_ecdsa_signature.html">EcdsaSignature</a> *sig)</td></tr>
<tr class="memdesc:ga67091ecae643c1b8a0b0a4946eda7afe"><td class="mdescLeft"> </td><td class="mdescRight">Creates ECDSA signature of buffer. <a href="#ga67091ecae643c1b8a0b0a4946eda7afe">More...</a><br /></td></tr>
<tr class="separator:ga67091ecae643c1b8a0b0a4946eda7afe"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>Elliptic Curve Digital Signature Algorithm Primitives. </p>
<p>Provides APIs for computing and checking buffer signatures using the Elliptic Curve Digital Signature Algorithm. </p>
<h2 class="groupheader">Function Documentation</h2>
<a class="anchor" id="ga67091ecae643c1b8a0b0a4946eda7afe"></a>
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<td class="memname"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a> EcdsaSignBuffer </td>
<td>(</td>
<td class="paramtype">void const * </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>buf_len</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="struct_ecdsa_private_key.html">EcdsaPrivateKey</a> const * </td>
<td class="paramname"><em>privkey</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___epid_common.html#ga6119a2c0323a3fca9e502b24bc378c2c">BitSupplier</a> </td>
<td class="paramname"><em>rnd_func</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"><em>rnd_param</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="struct_ecdsa_signature.html">EcdsaSignature</a> * </td>
<td class="paramname"><em>sig</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>Creates ECDSA signature of buffer. </p>
<p>Uses Elliptic Curve Digital Signature Algorithm (ECDSA) to generate a signature of the SHA256 hash of the input buffer with the provided private key.</p>
<p>The operation is over the standard secp256r1 curve.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">buf</td><td>Pointer to buffer containing message to sign. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">buf_len</td><td>The size of buf in bytes. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">privkey</td><td>The ECDSA private key on secp256r1 curve. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">rnd_func</td><td>Random number generator. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">rnd_param</td><td>Pass through context data for rnd_func. </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">sig</td><td>The resulting ECDSA signature.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360" title="Return status for SDK functions. ">EpidStatus</a></dd></dl>
<dl class="retval"><dt>Return values</dt><dd>
<table class="retval">
<tr><td class="paramname"><a class="el" href="group___error_codes.html#ggafdb27c77c2c4b32c807e326a8a0da360a61234ad9610406da6bf7977afd72a357" title="reached max iteration for random number generation ">kEpidRandMaxIterErr</a></td><td>Failed to sign after maximum number of iterations due to bad luck in random number generation.</td></tr>
</table>
</dd>
</dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="group___ecdsa_primitives.html#ga67091ecae643c1b8a0b0a4946eda7afe" title="Creates ECDSA signature of buffer. ">EcdsaSignBuffer</a> </dd></dl>
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<tr>
<td class="memname"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a> EcdsaVerifyBuffer </td>
<td>(</td>
<td class="paramtype">void const * </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>buf_len</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="struct_ecdsa_public_key.html">EcdsaPublicKey</a> const * </td>
<td class="paramname"><em>pubkey</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="struct_ecdsa_signature.html">EcdsaSignature</a> const * </td>
<td class="paramname"><em>sig</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Verifies authenticity of a digital signature over a buffer. </p>
<p>Uses Elliptic Curve Digital Signature Algorithm (ECDSA) to verify that the SHA256 hash of the input buffer was signed with the private key corresponding to the provided public key.</p>
<p>The operation is over the standard secp256r1 curve.</p>
<dl class="section warning"><dt>Warning</dt><dd>It is the responsibility of the caller to verify the identity of the public key.</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">buf</td><td>Pointer to buffer containing message to verify. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">buf_len</td><td>The size of buf in bytes. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">pubkey</td><td>The ECDSA public key on secp256r1 curve. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">sig</td><td>The ECDSA signature to be verified.</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360" title="Return status for SDK functions. ">EpidStatus</a></dd></dl>
<dl class="retval"><dt>Return values</dt><dd>
<table class="retval">
<tr><td class="paramname"><a class="el" href="group___error_codes.html#ggafdb27c77c2c4b32c807e326a8a0da360ab45ad60085d03c03ea30b40a0519897e" title="Signature is valid. ">kEpidSigValid</a></td><td><a class="el" href="struct_ecdsa_signature.html" title="ECDSA Signature using NIST 256-bit curve secp256r1. ">EcdsaSignature</a> is valid for the given buffer. </td></tr>
<tr><td class="paramname"><a class="el" href="group___error_codes.html#ggafdb27c77c2c4b32c807e326a8a0da360aeedd19b8a1cbdecf963f90b4860e02b8" title="Signature is invalid. ">kEpidSigInvalid</a></td><td><a class="el" href="struct_ecdsa_signature.html" title="ECDSA Signature using NIST 256-bit curve secp256r1. ">EcdsaSignature</a> is invalid for the given buffer.</td></tr>
</table>
</dd>
</dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="group___ecdsa_primitives.html#ga67091ecae643c1b8a0b0a4946eda7afe" title="Creates ECDSA signature of buffer. ">EcdsaSignBuffer</a> </dd></dl>
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