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<p>Elliptic curve group implementation.  
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;string.h&gt;</code><br />
<code>#include &quot;epid/common/math/bignum-internal.h&quot;</code><br />
<code>#include &quot;epid/common/math/ecgroup-internal.h&quot;</code><br />
<code>#include &quot;<a class="el" href="ecgroup_8h.html">epid/common/math/ecgroup.h</a>&quot;</code><br />
<code>#include &quot;epid/common/math/finitefield-internal.h&quot;</code><br />
<code>#include &quot;<a class="el" href="memory_8h.html">epid/common/memory.h</a>&quot;</code><br />
<code>#include &quot;ext/ipp/include/ippcp.h&quot;</code><br />
<code>#include &quot;ext/ipp/include/ippcpepid.h&quot;</code><br />
</div><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:a26d8b2ac362504939125b9196abc8aaa"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a26d8b2ac362504939125b9196abc8aaa"></a>
#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="ecgroup_8c.html#a26d8b2ac362504939125b9196abc8aaa">EPID_ECHASH_WATCHDOG</a>&#160;&#160;&#160;(50)</td></tr>
<tr class="memdesc:a26d8b2ac362504939125b9196abc8aaa"><td class="mdescLeft">&#160;</td><td class="mdescRight">The number of attempts to hash a message to an element. <br /></td></tr>
<tr class="separator:a26d8b2ac362504939125b9196abc8aaa"><td class="memSeparator" colspan="2">&#160;</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:gaf4e23677dd378ef2e0cf55df79cbdb62"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___ec_group_primitives.html#gaf4e23677dd378ef2e0cf55df79cbdb62">NewEcGroup</a> (<a class="el" href="group___finite_field_primitives.html#gab281b24e336a8b3d7d90079d862d969e">FiniteField</a> const *ff, <a class="el" href="group___finite_field_primitives.html#ga6cff5c7c06b07a87442b810ccc0a86fa">FfElement</a> const *a, <a class="el" href="group___finite_field_primitives.html#ga6cff5c7c06b07a87442b810ccc0a86fa">FfElement</a> const *b, <a class="el" href="group___finite_field_primitives.html#ga6cff5c7c06b07a87442b810ccc0a86fa">FfElement</a> const *x, <a class="el" href="group___finite_field_primitives.html#ga6cff5c7c06b07a87442b810ccc0a86fa">FfElement</a> const *y, <a class="el" href="group___big_num_primitives.html#ga2bf153e27be2683f0fb26f0f7ff1f718">BigNum</a> const *order, <a class="el" href="group___big_num_primitives.html#ga2bf153e27be2683f0fb26f0f7ff1f718">BigNum</a> const *cofactor, <a class="el" href="group___ec_group_primitives.html#gac91c5a7623c17a868dd15b2e9aaf7159">EcGroup</a> **g)</td></tr>
<tr class="memdesc:gaf4e23677dd378ef2e0cf55df79cbdb62"><td class="mdescLeft">&#160;</td><td class="mdescRight">Constructs a new EcGroup.  <a href="group___ec_group_primitives.html#gaf4e23677dd378ef2e0cf55df79cbdb62">More...</a><br /></td></tr>
<tr class="separator:gaf4e23677dd378ef2e0cf55df79cbdb62"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gab7af276256c27610eda85ff432b846ea"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___ec_group_primitives.html#gab7af276256c27610eda85ff432b846ea">DeleteEcGroup</a> (<a class="el" href="group___ec_group_primitives.html#gac91c5a7623c17a868dd15b2e9aaf7159">EcGroup</a> **g)</td></tr>
<tr class="memdesc:gab7af276256c27610eda85ff432b846ea"><td class="mdescLeft">&#160;</td><td class="mdescRight">Deletes a previously allocated EcGroup.  <a href="group___ec_group_primitives.html#gab7af276256c27610eda85ff432b846ea">More...</a><br /></td></tr>
<tr class="separator:gab7af276256c27610eda85ff432b846ea"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga6417b0ce72ba96de00c329e322fec7fb"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___ec_group_primitives.html#ga6417b0ce72ba96de00c329e322fec7fb">NewEcPoint</a> (<a class="el" href="group___ec_group_primitives.html#gac91c5a7623c17a868dd15b2e9aaf7159">EcGroup</a> const *g, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> **p)</td></tr>
<tr class="memdesc:ga6417b0ce72ba96de00c329e322fec7fb"><td class="mdescLeft">&#160;</td><td class="mdescRight">Creates a new EcPoint.  <a href="group___ec_group_primitives.html#ga6417b0ce72ba96de00c329e322fec7fb">More...</a><br /></td></tr>
<tr class="separator:ga6417b0ce72ba96de00c329e322fec7fb"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga8cb086d792bffb79b3ca07e6ca4ce0e7"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___ec_group_primitives.html#ga8cb086d792bffb79b3ca07e6ca4ce0e7">DeleteEcPoint</a> (<a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> **p)</td></tr>
<tr class="memdesc:ga8cb086d792bffb79b3ca07e6ca4ce0e7"><td class="mdescLeft">&#160;</td><td class="mdescRight">Deletes a previously allocated EcPoint.  <a href="group___ec_group_primitives.html#ga8cb086d792bffb79b3ca07e6ca4ce0e7">More...</a><br /></td></tr>
<tr class="separator:ga8cb086d792bffb79b3ca07e6ca4ce0e7"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ac0a2b4aa2484318938498e29c8ee4a9b"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="ecgroup_8c.html#ac0a2b4aa2484318938498e29c8ee4a9b">eccontains</a> (<a class="el" href="group___ec_group_primitives.html#gac91c5a7623c17a868dd15b2e9aaf7159">EcGroup</a> *g, void const *p_str, size_t strlen, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> *p, <a class="el" href="stdtypes_8h.html#ad5c9d4ba3dc37783a528b0925dc981a0">bool</a> *in_group)</td></tr>
<tr class="memdesc:ac0a2b4aa2484318938498e29c8ee4a9b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Check and initialize element if it is in elliptic curve group.  <a href="#ac0a2b4aa2484318938498e29c8ee4a9b">More...</a><br /></td></tr>
<tr class="separator:ac0a2b4aa2484318938498e29c8ee4a9b"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga2d433f567fa2419465a49604f4da21ad"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___ec_group_primitives.html#ga2d433f567fa2419465a49604f4da21ad">ReadEcPoint</a> (<a class="el" href="group___ec_group_primitives.html#gac91c5a7623c17a868dd15b2e9aaf7159">EcGroup</a> *g, void const *p_str, size_t strlen, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> *p)</td></tr>
<tr class="memdesc:ga2d433f567fa2419465a49604f4da21ad"><td class="mdescLeft">&#160;</td><td class="mdescRight">Deserializes an EcPoint from a string.  <a href="group___ec_group_primitives.html#ga2d433f567fa2419465a49604f4da21ad">More...</a><br /></td></tr>
<tr class="separator:ga2d433f567fa2419465a49604f4da21ad"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga4bb7d6691ffbb6e947c1068453e27fbd"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___ec_group_primitives.html#ga4bb7d6691ffbb6e947c1068453e27fbd">WriteEcPoint</a> (<a class="el" href="group___ec_group_primitives.html#gac91c5a7623c17a868dd15b2e9aaf7159">EcGroup</a> *g, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> const *p, void *p_str, size_t strlen)</td></tr>
<tr class="memdesc:ga4bb7d6691ffbb6e947c1068453e27fbd"><td class="mdescLeft">&#160;</td><td class="mdescRight">Serializes an EcPoint to a string.  <a href="group___ec_group_primitives.html#ga4bb7d6691ffbb6e947c1068453e27fbd">More...</a><br /></td></tr>
<tr class="separator:ga4bb7d6691ffbb6e947c1068453e27fbd"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga25c9013cc76907d73765eb7a96aa8c96"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___ec_group_primitives.html#ga25c9013cc76907d73765eb7a96aa8c96">EcMul</a> (<a class="el" href="group___ec_group_primitives.html#gac91c5a7623c17a868dd15b2e9aaf7159">EcGroup</a> *g, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> const *a, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> const *b, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> *r)</td></tr>
<tr class="memdesc:ga25c9013cc76907d73765eb7a96aa8c96"><td class="mdescLeft">&#160;</td><td class="mdescRight">Multiplies two elements in an elliptic curve group.  <a href="group___ec_group_primitives.html#ga25c9013cc76907d73765eb7a96aa8c96">More...</a><br /></td></tr>
<tr class="separator:ga25c9013cc76907d73765eb7a96aa8c96"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga01bf8d6fa60a2e445490966b3a06c270"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___ec_group_primitives.html#ga01bf8d6fa60a2e445490966b3a06c270">EcExp</a> (<a class="el" href="group___ec_group_primitives.html#gac91c5a7623c17a868dd15b2e9aaf7159">EcGroup</a> *g, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> const *a, <a class="el" href="struct_big_num_str.html">BigNumStr</a> const *b, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> *r)</td></tr>
<tr class="memdesc:ga01bf8d6fa60a2e445490966b3a06c270"><td class="mdescLeft">&#160;</td><td class="mdescRight">Raises a point in an elliptic curve group to a power.  <a href="group___ec_group_primitives.html#ga01bf8d6fa60a2e445490966b3a06c270">More...</a><br /></td></tr>
<tr class="separator:ga01bf8d6fa60a2e445490966b3a06c270"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gaf3b6a548aa6f0d4f028a14feca251f57"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___ec_group_primitives.html#gaf3b6a548aa6f0d4f028a14feca251f57">EcSscmExp</a> (<a class="el" href="group___ec_group_primitives.html#gac91c5a7623c17a868dd15b2e9aaf7159">EcGroup</a> *g, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> const *a, <a class="el" href="struct_big_num_str.html">BigNumStr</a> const *b, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> *r)</td></tr>
<tr class="memdesc:gaf3b6a548aa6f0d4f028a14feca251f57"><td class="mdescLeft">&#160;</td><td class="mdescRight">Software side-channel mitigated implementation of EcExp.  <a href="group___ec_group_primitives.html#gaf3b6a548aa6f0d4f028a14feca251f57">More...</a><br /></td></tr>
<tr class="separator:gaf3b6a548aa6f0d4f028a14feca251f57"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gae96c38e004ccd2211290ad6e66415ec4"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___ec_group_primitives.html#gae96c38e004ccd2211290ad6e66415ec4">EcMultiExp</a> (<a class="el" href="group___ec_group_primitives.html#gac91c5a7623c17a868dd15b2e9aaf7159">EcGroup</a> *g, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> const **a, <a class="el" href="struct_big_num_str.html">BigNumStr</a> const **b, size_t m, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> *r)</td></tr>
<tr class="memdesc:gae96c38e004ccd2211290ad6e66415ec4"><td class="mdescLeft">&#160;</td><td class="mdescRight">Multi-exponentiates elements in elliptic curve group.  <a href="group___ec_group_primitives.html#gae96c38e004ccd2211290ad6e66415ec4">More...</a><br /></td></tr>
<tr class="separator:gae96c38e004ccd2211290ad6e66415ec4"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga40e3431d3dbe8cf7a65ada7b7811cba4"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___ec_group_primitives.html#ga40e3431d3dbe8cf7a65ada7b7811cba4">EcSscmMultiExp</a> (<a class="el" href="group___ec_group_primitives.html#gac91c5a7623c17a868dd15b2e9aaf7159">EcGroup</a> *g, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> const **a, <a class="el" href="struct_big_num_str.html">BigNumStr</a> const **b, size_t m, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> *r)</td></tr>
<tr class="memdesc:ga40e3431d3dbe8cf7a65ada7b7811cba4"><td class="mdescLeft">&#160;</td><td class="mdescRight">Software side-channel mitigated implementation of EcMultiExp.  <a href="group___ec_group_primitives.html#ga40e3431d3dbe8cf7a65ada7b7811cba4">More...</a><br /></td></tr>
<tr class="separator:ga40e3431d3dbe8cf7a65ada7b7811cba4"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga3f96c43d14d24de0f7a5e214aef64196"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___ec_group_primitives.html#ga3f96c43d14d24de0f7a5e214aef64196">EcGetRandom</a> (<a class="el" href="group___ec_group_primitives.html#gac91c5a7623c17a868dd15b2e9aaf7159">EcGroup</a> *g, <a class="el" href="group___epid_common.html#ga6119a2c0323a3fca9e502b24bc378c2c">BitSupplier</a> rnd_func, void *rnd_func_param, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> *r)</td></tr>
<tr class="memdesc:ga3f96c43d14d24de0f7a5e214aef64196"><td class="mdescLeft">&#160;</td><td class="mdescRight">Generates a random element from an elliptic curve group.  <a href="group___ec_group_primitives.html#ga3f96c43d14d24de0f7a5e214aef64196">More...</a><br /></td></tr>
<tr class="separator:ga3f96c43d14d24de0f7a5e214aef64196"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga4d0f32aede3066eae500241b387bd970"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___ec_group_primitives.html#ga4d0f32aede3066eae500241b387bd970">EcInGroup</a> (<a class="el" href="group___ec_group_primitives.html#gac91c5a7623c17a868dd15b2e9aaf7159">EcGroup</a> *g, void const *p_str, size_t strlen, <a class="el" href="stdtypes_8h.html#ad5c9d4ba3dc37783a528b0925dc981a0">bool</a> *in_group)</td></tr>
<tr class="memdesc:ga4d0f32aede3066eae500241b387bd970"><td class="mdescLeft">&#160;</td><td class="mdescRight">Checks if a point is in an elliptic curve group.  <a href="group___ec_group_primitives.html#ga4d0f32aede3066eae500241b387bd970">More...</a><br /></td></tr>
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<tr class="memitem:gadc22ee07864a7ee681a881029b69d76a"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___ec_group_primitives.html#gadc22ee07864a7ee681a881029b69d76a">EcHash</a> (<a class="el" href="group___ec_group_primitives.html#gac91c5a7623c17a868dd15b2e9aaf7159">EcGroup</a> *g, void const *msg, size_t msg_len, <a class="el" href="group___epid_types.html#ga5e450438f6f9a5eacd0cf5ce354ec890">HashAlg</a> hash_alg, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> *r)</td></tr>
<tr class="memdesc:gadc22ee07864a7ee681a881029b69d76a"><td class="mdescLeft">&#160;</td><td class="mdescRight">Hashes an arbitrary message to an element in an elliptic curve group.  <a href="group___ec_group_primitives.html#gadc22ee07864a7ee681a881029b69d76a">More...</a><br /></td></tr>
<tr class="separator:gadc22ee07864a7ee681a881029b69d76a"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga8a6114a48214a327d4ec04fd25e5940e"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___ec_group_primitives.html#ga8a6114a48214a327d4ec04fd25e5940e">EcMakePoint</a> (<a class="el" href="group___ec_group_primitives.html#gac91c5a7623c17a868dd15b2e9aaf7159">EcGroup</a> *g, <a class="el" href="group___finite_field_primitives.html#ga6cff5c7c06b07a87442b810ccc0a86fa">FfElement</a> const *x, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> *r)</td></tr>
<tr class="memdesc:ga8a6114a48214a327d4ec04fd25e5940e"><td class="mdescLeft">&#160;</td><td class="mdescRight">Sets an EcPoint variable to a point on a curve.  <a href="group___ec_group_primitives.html#ga8a6114a48214a327d4ec04fd25e5940e">More...</a><br /></td></tr>
<tr class="separator:ga8a6114a48214a327d4ec04fd25e5940e"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga0b6d7a3398251e9352fb29ef4abef466"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___ec_group_primitives.html#ga0b6d7a3398251e9352fb29ef4abef466">EcInverse</a> (<a class="el" href="group___ec_group_primitives.html#gac91c5a7623c17a868dd15b2e9aaf7159">EcGroup</a> *g, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> const *p, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> *r)</td></tr>
<tr class="memdesc:ga0b6d7a3398251e9352fb29ef4abef466"><td class="mdescLeft">&#160;</td><td class="mdescRight">Computes the additive inverse of an EcPoint.  <a href="group___ec_group_primitives.html#ga0b6d7a3398251e9352fb29ef4abef466">More...</a><br /></td></tr>
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<tr class="memitem:gad3b3c63c48fa24e8dea07837b05bc061"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___ec_group_primitives.html#gad3b3c63c48fa24e8dea07837b05bc061">EcIsEqual</a> (<a class="el" href="group___ec_group_primitives.html#gac91c5a7623c17a868dd15b2e9aaf7159">EcGroup</a> *g, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> const *a, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> const *b, <a class="el" href="stdtypes_8h.html#ad5c9d4ba3dc37783a528b0925dc981a0">bool</a> *is_equal)</td></tr>
<tr class="memdesc:gad3b3c63c48fa24e8dea07837b05bc061"><td class="mdescLeft">&#160;</td><td class="mdescRight">Checks if two EcPoints are equal.  <a href="group___ec_group_primitives.html#gad3b3c63c48fa24e8dea07837b05bc061">More...</a><br /></td></tr>
<tr class="separator:gad3b3c63c48fa24e8dea07837b05bc061"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga9cf15b34bc4ff12e58b169dd989d8210"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group___ec_group_primitives.html#ga9cf15b34bc4ff12e58b169dd989d8210">EcIsIdentity</a> (<a class="el" href="group___ec_group_primitives.html#gac91c5a7623c17a868dd15b2e9aaf7159">EcGroup</a> *g, <a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> const *p, <a class="el" href="stdtypes_8h.html#ad5c9d4ba3dc37783a528b0925dc981a0">bool</a> *is_identity)</td></tr>
<tr class="memdesc:ga9cf15b34bc4ff12e58b169dd989d8210"><td class="mdescLeft">&#160;</td><td class="mdescRight">Checks if an EcPoint is the identity element.  <a href="group___ec_group_primitives.html#ga9cf15b34bc4ff12e58b169dd989d8210">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>Elliptic curve group implementation. </p>
</div><h2 class="groupheader">Function Documentation</h2>
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          <td class="memname"><a class="el" href="group___error_codes.html#gafdb27c77c2c4b32c807e326a8a0da360">EpidStatus</a> eccontains </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="group___ec_group_primitives.html#gac91c5a7623c17a868dd15b2e9aaf7159">EcGroup</a> *&#160;</td>
          <td class="paramname"><em>g</em>, </td>
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          <td class="paramkey"></td>
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          <td class="paramtype">void const *&#160;</td>
          <td class="paramname"><em>p_str</em>, </td>
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          <td class="paramkey"></td>
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          <td class="paramtype">size_t&#160;</td>
          <td class="paramname"><em>strlen</em>, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="group___ec_group_primitives.html#ga85c1d5e106031b385a6e23e598ac98fa">EcPoint</a> *&#160;</td>
          <td class="paramname"><em>p</em>, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="stdtypes_8h.html#ad5c9d4ba3dc37783a528b0925dc981a0">bool</a> *&#160;</td>
          <td class="paramname"><em>in_group</em>&#160;</td>
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          <td>)</td>
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<p>Check and initialize element if it is in elliptic curve group. </p>
<p>This is internal function. Takes a value p as input. If p is indeed an element of g, it outputs true, otherwise, it outputs false.</p>
<p>This is only used to check if input buffer are actually valid elements in group. If p is in g, this fills p and initializes it to internal FfElement format.</p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">g</td><td>The eliptic curve group in which to perform the check </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">p_str</td><td>Serialized eliptic curve group element to check </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">strlen</td><td>The size of p_str in bytes. </td></tr>
    <tr><td class="paramdir">[out]</td><td class="paramname">p</td><td>Deserialized value of p_str </td></tr>
    <tr><td class="paramdir">[out]</td><td class="paramname">in_group</td><td>Result of the check</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="section see"><dt>See also</dt><dd><a class="el" href="group___ec_group_primitives.html#ga6417b0ce72ba96de00c329e322fec7fb" title="Creates a new EcPoint. ">NewEcPoint</a> </dd></dl>

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