236 lines
7 KiB
C
236 lines
7 KiB
C
/* crypto/ec/ecp_nist.c */
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/*
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* Written by Nils Larsch for the OpenSSL project.
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*/
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/* ====================================================================
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* Copyright (c) 1998-2003 The OpenSSL 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 OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL 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 OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL 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 OpenSSL 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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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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/* ====================================================================
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* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
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* Portions of this software developed by SUN MICROSYSTEMS, INC.,
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* and contributed to the OpenSSL project.
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*/
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#include <limits.h>
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#include <openssl/err.h>
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#include <openssl/obj_mac.h>
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#include "ec_lcl.h"
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const EC_METHOD *EC_GFp_nist_method(void)
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{
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static const EC_METHOD ret = {
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NID_X9_62_prime_field,
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ec_GFp_simple_group_init,
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ec_GFp_simple_group_finish,
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ec_GFp_simple_group_clear_finish,
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ec_GFp_nist_group_copy,
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ec_GFp_nist_group_set_curve,
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ec_GFp_simple_group_get_curve,
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ec_GFp_simple_group_get_degree,
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ec_GFp_simple_group_check_discriminant,
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ec_GFp_simple_point_init,
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ec_GFp_simple_point_finish,
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ec_GFp_simple_point_clear_finish,
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ec_GFp_simple_point_copy,
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ec_GFp_simple_point_set_to_infinity,
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ec_GFp_simple_set_Jprojective_coordinates_GFp,
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ec_GFp_simple_get_Jprojective_coordinates_GFp,
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ec_GFp_simple_point_set_affine_coordinates,
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ec_GFp_simple_point_get_affine_coordinates,
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ec_GFp_simple_set_compressed_coordinates,
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ec_GFp_simple_point2oct,
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ec_GFp_simple_oct2point,
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ec_GFp_simple_add,
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ec_GFp_simple_dbl,
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ec_GFp_simple_invert,
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ec_GFp_simple_is_at_infinity,
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ec_GFp_simple_is_on_curve,
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ec_GFp_simple_cmp,
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ec_GFp_simple_make_affine,
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ec_GFp_simple_points_make_affine,
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0 /* mul */,
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0 /* precompute_mult */,
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0 /* have_precompute_mult */,
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ec_GFp_nist_field_mul,
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ec_GFp_nist_field_sqr,
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0 /* field_div */,
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0 /* field_encode */,
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0 /* field_decode */,
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0 /* field_set_to_one */ };
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return &ret;
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}
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#if BN_BITS2 == 64 && UINT_MAX != 4294967295UL && ULONG_MAX != 4294967295UL
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#define NO_32_BIT_TYPE
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#endif
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int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src)
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{
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dest->field_mod_func = src->field_mod_func;
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return ec_GFp_simple_group_copy(dest, src);
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}
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int ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,
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const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
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{
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int ret = 0;
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BN_CTX *new_ctx = NULL;
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BIGNUM *tmp_bn;
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if (ctx == NULL)
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if ((ctx = new_ctx = BN_CTX_new()) == NULL) return 0;
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BN_CTX_start(ctx);
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if ((tmp_bn = BN_CTX_get(ctx)) == NULL) goto err;
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if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0)
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group->field_mod_func = BN_nist_mod_192;
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else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0)
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{
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#if !defined(NO_32_BIT_TYPE) || defined(OPENSSL_NO_ASM)
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group->field_mod_func = BN_nist_mod_224;
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#else
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ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE_GFP, EC_R_NOT_A_SUPPORTED_NIST_PRIME);
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goto err;
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#endif
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}
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else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0)
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{
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#if !defined(NO_32_BIT_TYPE) || defined(OPENSSL_NO_ASM)
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group->field_mod_func = BN_nist_mod_256;
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#else
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ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE_GFP, EC_R_NOT_A_SUPPORTED_NIST_PRIME);
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goto err;
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#endif
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}
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else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0)
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{
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#if !defined(NO_32_BIT_TYPE) || defined(OPENSSL_NO_ASM)
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group->field_mod_func = BN_nist_mod_384;
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#else
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ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE_GFP, EC_R_NOT_A_SUPPORTED_NIST_PRIME);
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goto err;
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#endif
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}
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else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0)
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/* this one works in the NO_32_BIT_TYPE case */
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group->field_mod_func = BN_nist_mod_521;
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else
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{
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ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE_GFP, EC_R_NOT_A_NIST_PRIME);
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goto err;
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}
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ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
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err:
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BN_CTX_end(ctx);
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if (new_ctx != NULL)
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BN_CTX_free(new_ctx);
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return ret;
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}
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int ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
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const BIGNUM *b, BN_CTX *ctx)
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{
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int ret=0;
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BN_CTX *ctx_new=NULL;
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if (!group || !r || !a || !b)
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{
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ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER);
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goto err;
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}
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if (!ctx)
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if ((ctx_new = ctx = BN_CTX_new()) == NULL) goto err;
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if (!BN_mul(r, a, b, ctx)) goto err;
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if (!group->field_mod_func(r, r, &group->field, ctx))
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goto err;
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ret=1;
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err:
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if (ctx_new)
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BN_CTX_free(ctx_new);
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return ret;
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}
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int ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
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BN_CTX *ctx)
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{
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int ret=0;
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BN_CTX *ctx_new=NULL;
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if (!group || !r || !a)
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{
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ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER);
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goto err;
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}
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if (!ctx)
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if ((ctx_new = ctx = BN_CTX_new()) == NULL) goto err;
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if (!BN_sqr(r, a, ctx)) goto err;
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if (!group->field_mod_func(r, r, &group->field, ctx))
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goto err;
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ret=1;
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err:
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if (ctx_new)
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BN_CTX_free(ctx_new);
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return ret;
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}
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