/* crypto/ec/ecp_mont.c */
/*
* Originally written by Bodo Moeller for the OpenSSL project.
*/
/* ====================================================================
* Copyright (c) 1998-2001 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 <openssl/err.h>
#include "ec_lcl.h"
const EC_METHOD *EC_GFp_mont_method(void)
{
static const EC_METHOD ret = {
NID_X9_62_prime_field,
ec_GFp_mont_group_init,
ec_GFp_mont_group_finish,
ec_GFp_mont_group_clear_finish,
ec_GFp_mont_group_copy,
ec_GFp_mont_group_set_curve,
ec_GFp_simple_group_get_curve,
ec_GFp_simple_group_get_degree,
ec_GFp_simple_group_check_discriminant,
ec_GFp_simple_point_init,
ec_GFp_simple_point_finish,
ec_GFp_simple_point_clear_finish,
ec_GFp_simple_point_copy,
ec_GFp_simple_point_set_to_infinity,
ec_GFp_simple_set_Jprojective_coordinates_GFp,
ec_GFp_simple_get_Jprojective_coordinates_GFp,
ec_GFp_simple_point_set_affine_coordinates,
ec_GFp_simple_point_get_affine_coordinates,
ec_GFp_simple_set_compressed_coordinates,
ec_GFp_simple_point2oct,
ec_GFp_simple_oct2point,
ec_GFp_simple_add,
ec_GFp_simple_dbl,
ec_GFp_simple_invert,
ec_GFp_simple_is_at_infinity,
ec_GFp_simple_is_on_curve,
ec_GFp_simple_cmp,
ec_GFp_simple_make_affine,
ec_GFp_simple_points_make_affine,
0 /* mul */,
0 /* precompute_mult */,
0 /* have_precompute_mult */,
ec_GFp_mont_field_mul,
ec_GFp_mont_field_sqr,
0 /* field_div */,
ec_GFp_mont_field_encode,
ec_GFp_mont_field_decode,
ec_GFp_mont_field_set_to_one };
return &ret;
}
int ec_GFp_mont_group_init(EC_GROUP *group)
{
int ok;
ok = ec_GFp_simple_group_init(group);
group->field_data1 = NULL;
group->field_data2 = NULL;
return ok;
}
void ec_GFp_mont_group_finish(EC_GROUP *group)
{
if (group->field_data1 != NULL)
{
BN_MONT_CTX_free(group->field_data1);
group->field_data1 = NULL;
}
if (group->field_data2 != NULL)
{
BN_free(group->field_data2);
group->field_data2 = NULL;
}
ec_GFp_simple_group_finish(group);
}
void ec_GFp_mont_group_clear_finish(EC_GROUP *group)
{
if (group->field_data1 != NULL)
{
BN_MONT_CTX_free(group->field_data1);
group->field_data1 = NULL;
}
if (group->field_data2 != NULL)
{
BN_clear_free(group->field_data2);
group->field_data2 = NULL;
}
ec_GFp_simple_group_clear_finish(group);
}
int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src)
{
if (dest->field_data1 != NULL)
{
BN_MONT_CTX_free(dest->field_data1);
dest->field_data1 = NULL;
}
if (dest->field_data2 != NULL)
{
BN_clear_free(dest->field_data2);
dest->field_data2 = NULL;
}
if (!ec_GFp_simple_group_copy(dest, src)) return 0;
if (src->field_data1 != NULL)
{
dest->field_data1 = BN_MONT_CTX_new();
if (dest->field_data1 == NULL) return 0;
if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) goto err;
}
if (src->field_data2 != NULL)
{
dest->field_data2 = BN_dup(src->field_data2);
if (dest->field_data2 == NULL) goto err;
}
return 1;
err:
if (dest->field_data1 != NULL)
{
BN_MONT_CTX_free(dest->field_data1);
dest->field_data1 = NULL;
}
return 0;
}
int ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
{
BN_CTX *new_ctx = NULL;
BN_MONT_CTX *mont = NULL;
BIGNUM *one = NULL;
int ret = 0;
if (group->field_data1 != NULL)
{
BN_MONT_CTX_free(group->field_data1);
group->field_data1 = NULL;
}
if (group->field_data2 != NULL)
{
BN_free(group->field_data2);
group->field_data2 = NULL;
}
if (ctx == NULL)
{
ctx = new_ctx = BN_CTX_new();
if (ctx == NULL)
return 0;
}
mont = BN_MONT_CTX_new();
if (mont == NULL) goto err;
if (!BN_MONT_CTX_set(mont, p, ctx))
{
ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB);
goto err;
}
one = BN_new();
if (one == NULL) goto err;
if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) goto err;
group->field_data1 = mont;
mont = NULL;
group->field_data2 = one;
one = NULL;
ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
if (!ret)
{
BN_MONT_CTX_free(group->field_data1);
group->field_data1 = NULL;
BN_free(group->field_data2);
group->field_data2 = NULL;
}
err:
if (new_ctx != NULL)
BN_CTX_free(new_ctx);
if (mont != NULL)
BN_MONT_CTX_free(mont);
return ret;
}
int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
{
if (group->field_data1 == NULL)
{
ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED);
return 0;
}
return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
}
int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
{
if (group->field_data1 == NULL)
{
ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED);
return 0;
}
return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
}
int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
{
if (group->field_data1 == NULL)
{
ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED);
return 0;
}
return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx);
}
int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
{
if (group->field_data1 == NULL)
{
ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
return 0;
}
return BN_from_montgomery(r, a, group->field_data1, ctx);
}
int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx)
{
if (group->field_data2 == NULL)
{
ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED);
return 0;
}
if (!BN_copy(r, group->field_data2)) return 0;
return 1;
}