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115 lines
3.7 KiB
C
115 lines
3.7 KiB
C
/* ====================================================================
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* Copyright (c) 2016 The GmSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the GmSSL Project.
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* (http://gmssl.org/)"
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*
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* 4. The name "GmSSL Project" must not be used to endorse or promote
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* products derived from this software without prior written
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* permission. For written permission, please contact
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* guanzhi1980@gmail.com.
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*
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* 5. Products derived from this software may not be called "GmSSL"
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* nor may "GmSSL" appear in their names without prior written
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* permission of the GmSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the GmSSL Project
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* (http://gmssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE GmSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE GmSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*/
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/*
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* this file is to implement elliptic curve operations over extension
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* fields
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <openssl/bn.h>
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#include <openssl/err.h>
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#include <openssl/evp.h>
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#include <openssl/asn1.h>
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#include <openssl/asn1t.h>
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#include <openssl/fppoint.h>
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ASN1_SEQUENCE(FpPoint) = {
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ASN1_SIMPLE(FpPoint, x, BIGNUM),
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ASN1_SIMPLE(FpPoint, y, BIGNUM)
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} ASN1_SEQUENCE_END(FpPoint)
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IMPLEMENT_ASN1_FUNCTIONS(FpPoint)
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IMPLEMENT_ASN1_DUP_FUNCTION(FpPoint)
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int EC_POINT_cmp_fppoint(const EC_GROUP *group, const EC_POINT *a, const FpPoint *b,
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BN_CTX *bn_ctx)
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{
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int ret = -1;
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BIGNUM *x = NULL;
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BIGNUM *y = NULL;
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if (!group || !a || !b || !bn_ctx) {
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ECerr(EC_F_EC_POINT_CMP_FPPOINT, ERR_R_PASSED_NULL_PARAMETER);
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return -1;
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}
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BN_CTX_start(bn_ctx);
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x = BN_CTX_get(bn_ctx);
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y = BN_CTX_get(bn_ctx);
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if (!x || !y) {
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ECerr(EC_F_EC_POINT_CMP_FPPOINT, ERR_R_BN_LIB);
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goto end;
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}
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if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) == NID_X9_62_prime_field) {
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if (!EC_POINT_get_affine_coordinates_GFp(group, a, x, y, bn_ctx)) {
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ECerr(EC_F_EC_POINT_CMP_FPPOINT, ERR_R_EC_LIB);
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goto end;
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}
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} else {
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if (!EC_POINT_get_affine_coordinates_GF2m(group, a, x, y, bn_ctx)) {
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ECerr(EC_F_EC_POINT_CMP_FPPOINT, ERR_R_EC_LIB);
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goto end;
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}
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}
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if (BN_cmp(x, b->x) == 0 && BN_cmp(y, b->y) == 0) {
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ret = 0;
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} else {
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ret = 1;
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}
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end:
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BN_CTX_end(bn_ctx);
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return ret;
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}
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