284 lines
9.1 KiB
C
284 lines
9.1 KiB
C
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/* Originally written by Bodo Moeller and Nils Larsch for the OpenSSL project.
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* ====================================================================
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* Copyright (c) 1998-2005 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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*
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* Portions of the attached software ("Contribution") are developed by
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* SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
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*
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* The Contribution is licensed pursuant to the OpenSSL open source
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* license provided above.
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*
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* The elliptic curve binary polynomial software is originally written by
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* Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems
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* Laboratories. */
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#include <openssl/ec.h>
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#include <openssl/bn.h>
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#include <openssl/err.h>
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#include <openssl/mem.h>
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#include "internal.h"
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const EC_METHOD *EC_GFp_mont_method(void) {
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static const EC_METHOD ret = {EC_FLAGS_DEFAULT_OCT,
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ec_GFp_mont_group_init,
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ec_GFp_mont_group_finish,
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ec_GFp_mont_group_clear_finish,
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ec_GFp_mont_group_copy,
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ec_GFp_mont_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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0,
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0,
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0,
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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_mont_field_mul,
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ec_GFp_mont_field_sqr,
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0 /* field_div */,
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ec_GFp_mont_field_encode,
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ec_GFp_mont_field_decode,
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ec_GFp_mont_field_set_to_one};
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return &ret;
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}
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int ec_GFp_mont_group_init(EC_GROUP *group) {
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int ok;
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ok = ec_GFp_simple_group_init(group);
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group->mont = NULL;
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group->one = NULL;
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return ok;
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}
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void ec_GFp_mont_group_finish(EC_GROUP *group) {
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BN_MONT_CTX_free(group->mont);
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group->mont = NULL;
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BN_free(group->one);
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group->one = NULL;
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ec_GFp_simple_group_finish(group);
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}
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void ec_GFp_mont_group_clear_finish(EC_GROUP *group) {
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BN_MONT_CTX_free(group->mont);
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group->mont = NULL;
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BN_clear_free(group->one);
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group->one = NULL;
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ec_GFp_simple_group_clear_finish(group);
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}
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int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src) {
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BN_MONT_CTX_free(dest->mont);
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dest->mont = NULL;
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BN_clear_free(dest->one);
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dest->one = NULL;
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if (!ec_GFp_simple_group_copy(dest, src)) {
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return 0;
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}
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if (src->mont != NULL) {
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dest->mont = BN_MONT_CTX_new();
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if (dest->mont == NULL) {
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return 0;
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}
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if (!BN_MONT_CTX_copy(dest->mont, src->mont)) {
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goto err;
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}
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}
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if (src->one != NULL) {
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dest->one = BN_dup(src->one);
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if (dest->one == NULL) {
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goto err;
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}
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}
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return 1;
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err:
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BN_MONT_CTX_free(dest->mont);
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dest->mont = NULL;
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return 0;
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}
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int ec_GFp_mont_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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BN_CTX *new_ctx = NULL;
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BN_MONT_CTX *mont = NULL;
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BIGNUM *one = NULL;
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int ret = 0;
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BN_MONT_CTX_free(group->mont);
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group->mont = NULL;
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BN_free(group->one);
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group->one = NULL;
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if (ctx == NULL) {
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ctx = new_ctx = BN_CTX_new();
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if (ctx == NULL) {
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return 0;
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}
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}
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mont = BN_MONT_CTX_new();
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if (mont == NULL) {
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goto err;
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}
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if (!BN_MONT_CTX_set(mont, p, ctx)) {
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OPENSSL_PUT_ERROR(EC, ERR_R_BN_LIB);
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goto err;
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}
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one = BN_new();
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if (one == NULL || !BN_to_montgomery(one, BN_value_one(), mont, ctx)) {
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goto err;
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}
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group->mont = mont;
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mont = NULL;
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group->one = one;
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one = NULL;
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ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
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if (!ret) {
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BN_MONT_CTX_free(group->mont);
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group->mont = NULL;
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BN_free(group->one);
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group->one = NULL;
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}
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err:
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BN_CTX_free(new_ctx);
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BN_MONT_CTX_free(mont);
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BN_free(one);
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return ret;
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}
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int ec_GFp_mont_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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if (group->mont == NULL) {
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OPENSSL_PUT_ERROR(EC, EC_R_NOT_INITIALIZED);
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return 0;
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}
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return BN_mod_mul_montgomery(r, a, b, group->mont, ctx);
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}
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int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
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BN_CTX *ctx) {
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if (group->mont == NULL) {
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OPENSSL_PUT_ERROR(EC, EC_R_NOT_INITIALIZED);
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return 0;
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}
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return BN_mod_mul_montgomery(r, a, a, group->mont, ctx);
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}
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int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
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BN_CTX *ctx) {
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if (group->mont == NULL) {
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OPENSSL_PUT_ERROR(EC, EC_R_NOT_INITIALIZED);
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return 0;
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}
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return BN_to_montgomery(r, a, group->mont, ctx);
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}
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int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a,
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BN_CTX *ctx) {
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if (group->mont == NULL) {
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OPENSSL_PUT_ERROR(EC, EC_R_NOT_INITIALIZED);
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return 0;
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}
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return BN_from_montgomery(r, a, group->mont, ctx);
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}
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int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r,
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BN_CTX *ctx) {
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if (group->one == NULL) {
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OPENSSL_PUT_ERROR(EC, EC_R_NOT_INITIALIZED);
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return 0;
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}
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if (!BN_copy(r, group->one)) {
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return 0;
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}
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return 1;
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}
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