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308 lines
9.2 KiB
308 lines
9.2 KiB
/* crypto/ec/ecp_mont.c */ |
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/* |
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* Originally written by Bodo Moeller for the OpenSSL project. |
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*/ |
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/* ==================================================================== |
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* Copyright (c) 1998-2001 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 <openssl/err.h> |
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#ifdef OPENSSL_FIPS |
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# include <openssl/fips.h> |
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#endif |
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#include "ec_lcl.h" |
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const EC_METHOD *EC_GFp_mont_method(void) |
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{ |
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static const EC_METHOD ret = { |
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EC_FLAGS_DEFAULT_OCT, |
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NID_X9_62_prime_field, |
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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, 0, 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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}; |
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#ifdef OPENSSL_FIPS |
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if (FIPS_mode()) |
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return fips_ec_gfp_mont_method(); |
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#endif |
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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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{ |
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int ok; |
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ok = ec_GFp_simple_group_init(group); |
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group->field_data1 = NULL; |
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group->field_data2 = 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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{ |
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if (group->field_data1 != NULL) { |
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BN_MONT_CTX_free(group->field_data1); |
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group->field_data1 = NULL; |
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} |
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if (group->field_data2 != NULL) { |
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BN_free(group->field_data2); |
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group->field_data2 = NULL; |
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} |
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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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{ |
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if (group->field_data1 != NULL) { |
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BN_MONT_CTX_free(group->field_data1); |
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group->field_data1 = NULL; |
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} |
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if (group->field_data2 != NULL) { |
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BN_clear_free(group->field_data2); |
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group->field_data2 = NULL; |
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} |
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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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{ |
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if (dest->field_data1 != NULL) { |
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BN_MONT_CTX_free(dest->field_data1); |
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dest->field_data1 = NULL; |
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} |
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if (dest->field_data2 != NULL) { |
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BN_clear_free(dest->field_data2); |
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dest->field_data2 = NULL; |
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} |
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if (!ec_GFp_simple_group_copy(dest, src)) |
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return 0; |
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if (src->field_data1 != NULL) { |
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dest->field_data1 = BN_MONT_CTX_new(); |
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if (dest->field_data1 == NULL) |
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return 0; |
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if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) |
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goto err; |
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} |
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if (src->field_data2 != NULL) { |
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dest->field_data2 = BN_dup(src->field_data2); |
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if (dest->field_data2 == NULL) |
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goto err; |
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} |
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return 1; |
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err: |
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if (dest->field_data1 != NULL) { |
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BN_MONT_CTX_free(dest->field_data1); |
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dest->field_data1 = NULL; |
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} |
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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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{ |
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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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if (group->field_data1 != NULL) { |
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BN_MONT_CTX_free(group->field_data1); |
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group->field_data1 = NULL; |
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} |
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if (group->field_data2 != NULL) { |
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BN_free(group->field_data2); |
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group->field_data2 = NULL; |
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} |
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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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mont = BN_MONT_CTX_new(); |
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if (mont == NULL) |
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goto err; |
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if (!BN_MONT_CTX_set(mont, p, ctx)) { |
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ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, 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) |
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goto err; |
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if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) |
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goto err; |
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group->field_data1 = mont; |
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mont = NULL; |
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group->field_data2 = 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->field_data1); |
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group->field_data1 = NULL; |
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BN_free(group->field_data2); |
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group->field_data2 = NULL; |
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} |
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err: |
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if (new_ctx != NULL) |
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BN_CTX_free(new_ctx); |
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if (mont != NULL) |
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BN_MONT_CTX_free(mont); |
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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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{ |
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if (group->field_data1 == NULL) { |
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ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, 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->field_data1, 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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{ |
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if (group->field_data1 == NULL) { |
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ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, 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->field_data1, ctx); |
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} |
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int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, |
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const BIGNUM *a, BN_CTX *ctx) |
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{ |
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if (group->field_data1 == NULL) { |
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ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED); |
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return 0; |
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} |
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return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx); |
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} |
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int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, |
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const BIGNUM *a, BN_CTX *ctx) |
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{ |
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if (group->field_data1 == NULL) { |
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ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, 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->field_data1, 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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{ |
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if (group->field_data2 == NULL) { |
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ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED); |
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return 0; |
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} |
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if (!BN_copy(r, group->field_data2)) |
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return 0; |
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return 1; |
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}
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