| /* Originally written by Bodo Moeller and Nils Larsch for the OpenSSL project. |
| * ==================================================================== |
| * Copyright (c) 1998-2005 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 the attached software ("Contribution") are developed by |
| * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. |
| * |
| * The Contribution is licensed pursuant to the OpenSSL open source |
| * license provided above. |
| * |
| * The elliptic curve binary polynomial software is originally written by |
| * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems |
| * Laboratories. */ |
| |
| #include <openssl/ec.h> |
| |
| #include <openssl/bn.h> |
| #include <openssl/err.h> |
| #include <openssl/mem.h> |
| |
| #include "internal.h" |
| |
| |
| const EC_METHOD *EC_GFp_mont_method(void) { |
| static const EC_METHOD ret = {EC_FLAGS_DEFAULT_OCT, |
| 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, |
| 0, |
| 0, |
| 0, |
| 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)) { |
| OPENSSL_PUT_ERROR(EC, 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) { |
| OPENSSL_PUT_ERROR(EC, 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) { |
| OPENSSL_PUT_ERROR(EC, 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) { |
| OPENSSL_PUT_ERROR(EC, 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) { |
| OPENSSL_PUT_ERROR(EC, 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) { |
| OPENSSL_PUT_ERROR(EC, ec_GFp_mont_field_set_to_one, EC_R_NOT_INITIALIZED); |
| return 0; |
| } |
| |
| if (!BN_copy(r, group->field_data2)) |
| return 0; |
| return 1; |
| } |
