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/* $OpenBSD: ecp_nist.c,v 1.22 2023/03/07 05:45:14 jsing Exp $ */
/*
* Written by Nils Larsch for the OpenSSL project.
*/
/* ====================================================================
* Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
/* ====================================================================
* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
* Portions of this software developed by SUN MICROSYSTEMS, INC.,
* and contributed to the OpenSSL project.
*/
#include <limits.h>
#include <openssl/err.h>
#include <openssl/objects.h>
#include "ec_local.h"
static int
ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src)
{
dest->field_mod_func = src->field_mod_func;
return ec_GFp_simple_group_copy(dest, src);
}
static int
ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,
const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
{
int ret = 0;
BN_CTX *new_ctx = NULL;
BIGNUM *tmp_bn;
if (ctx == NULL)
if ((ctx = new_ctx = BN_CTX_new()) == NULL)
return 0;
BN_CTX_start(ctx);
if ((tmp_bn = BN_CTX_get(ctx)) == NULL)
goto err;
if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0)
group->field_mod_func = BN_nist_mod_192;
else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0)
group->field_mod_func = BN_nist_mod_224;
else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0)
group->field_mod_func = BN_nist_mod_256;
else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0)
group->field_mod_func = BN_nist_mod_384;
else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0)
group->field_mod_func = BN_nist_mod_521;
else {
ECerror(EC_R_NOT_A_NIST_PRIME);
goto err;
}
ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
err:
BN_CTX_end(ctx);
BN_CTX_free(new_ctx);
return ret;
}
static int
ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
const BIGNUM *b, BN_CTX *ctx)
{
int ret = 0;
BN_CTX *ctx_new = NULL;
if (!group || !r || !a || !b) {
ECerror(ERR_R_PASSED_NULL_PARAMETER);
goto err;
}
if (!ctx)
if ((ctx_new = ctx = BN_CTX_new()) == NULL)
goto err;
if (!BN_mul(r, a, b, ctx))
goto err;
if (!group->field_mod_func(r, r, &group->field, ctx))
goto err;
ret = 1;
err:
BN_CTX_free(ctx_new);
return ret;
}
static int
ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
BN_CTX *ctx)
{
int ret = 0;
BN_CTX *ctx_new = NULL;
if (!group || !r || !a) {
ECerror(EC_R_PASSED_NULL_PARAMETER);
goto err;
}
if (!ctx)
if ((ctx_new = ctx = BN_CTX_new()) == NULL)
goto err;
if (!BN_sqr(r, a, ctx))
goto err;
if (!group->field_mod_func(r, r, &group->field, ctx))
goto err;
ret = 1;
err:
BN_CTX_free(ctx_new);
return ret;
}
static const EC_METHOD ec_GFp_nist_method = {
.flags = EC_FLAGS_DEFAULT_OCT,
.field_type = NID_X9_62_prime_field,
.group_init = ec_GFp_simple_group_init,
.group_finish = ec_GFp_simple_group_finish,
.group_clear_finish = ec_GFp_simple_group_clear_finish,
.group_copy = ec_GFp_nist_group_copy,
.group_set_curve = ec_GFp_nist_group_set_curve,
.group_get_curve = ec_GFp_simple_group_get_curve,
.group_get_degree = ec_GFp_simple_group_get_degree,
.group_order_bits = ec_group_simple_order_bits,
.group_check_discriminant = ec_GFp_simple_group_check_discriminant,
.point_init = ec_GFp_simple_point_init,
.point_finish = ec_GFp_simple_point_finish,
.point_clear_finish = ec_GFp_simple_point_clear_finish,
.point_copy = ec_GFp_simple_point_copy,
.point_set_to_infinity = ec_GFp_simple_point_set_to_infinity,
.point_set_Jprojective_coordinates =
ec_GFp_simple_set_Jprojective_coordinates,
.point_get_Jprojective_coordinates =
ec_GFp_simple_get_Jprojective_coordinates,
.point_set_affine_coordinates =
ec_GFp_simple_point_set_affine_coordinates,
.point_get_affine_coordinates =
ec_GFp_simple_point_get_affine_coordinates,
.add = ec_GFp_simple_add,
.dbl = ec_GFp_simple_dbl,
.invert = ec_GFp_simple_invert,
.is_at_infinity = ec_GFp_simple_is_at_infinity,
.is_on_curve = ec_GFp_simple_is_on_curve,
.point_cmp = ec_GFp_simple_cmp,
.make_affine = ec_GFp_simple_make_affine,
.points_make_affine = ec_GFp_simple_points_make_affine,
.mul_generator_ct = ec_GFp_simple_mul_generator_ct,
.mul_single_ct = ec_GFp_simple_mul_single_ct,
.mul_double_nonct = ec_GFp_simple_mul_double_nonct,
.field_mul = ec_GFp_nist_field_mul,
.field_sqr = ec_GFp_nist_field_sqr,
.blind_coordinates = ec_GFp_simple_blind_coordinates,
};
const EC_METHOD *
EC_GFp_nist_method(void)
{
return &ec_GFp_nist_method;
}
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