1109998Smarkm/* crypto/ec/ecp_mont.c */ 2160814Ssimon/* 3160814Ssimon * Originally written by Bodo Moeller for the OpenSSL project. 4160814Ssimon */ 5109998Smarkm/* ==================================================================== 6109998Smarkm * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved. 7109998Smarkm * 8109998Smarkm * Redistribution and use in source and binary forms, with or without 9109998Smarkm * modification, are permitted provided that the following conditions 10109998Smarkm * are met: 11109998Smarkm * 12109998Smarkm * 1. Redistributions of source code must retain the above copyright 13296341Sdelphij * notice, this list of conditions and the following disclaimer. 14109998Smarkm * 15109998Smarkm * 2. Redistributions in binary form must reproduce the above copyright 16109998Smarkm * notice, this list of conditions and the following disclaimer in 17109998Smarkm * the documentation and/or other materials provided with the 18109998Smarkm * distribution. 19109998Smarkm * 20109998Smarkm * 3. All advertising materials mentioning features or use of this 21109998Smarkm * software must display the following acknowledgment: 22109998Smarkm * "This product includes software developed by the OpenSSL Project 23109998Smarkm * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 24109998Smarkm * 25109998Smarkm * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26109998Smarkm * endorse or promote products derived from this software without 27109998Smarkm * prior written permission. For written permission, please contact 28109998Smarkm * openssl-core@openssl.org. 29109998Smarkm * 30109998Smarkm * 5. Products derived from this software may not be called "OpenSSL" 31109998Smarkm * nor may "OpenSSL" appear in their names without prior written 32109998Smarkm * permission of the OpenSSL Project. 33109998Smarkm * 34109998Smarkm * 6. Redistributions of any form whatsoever must retain the following 35109998Smarkm * acknowledgment: 36109998Smarkm * "This product includes software developed by the OpenSSL Project 37109998Smarkm * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 38109998Smarkm * 39109998Smarkm * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40109998Smarkm * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41109998Smarkm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42109998Smarkm * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43109998Smarkm * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44109998Smarkm * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45109998Smarkm * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46109998Smarkm * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47109998Smarkm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48109998Smarkm * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49109998Smarkm * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50109998Smarkm * OF THE POSSIBILITY OF SUCH DAMAGE. 51109998Smarkm * ==================================================================== 52109998Smarkm * 53109998Smarkm * This product includes cryptographic software written by Eric Young 54109998Smarkm * (eay@cryptsoft.com). This product includes software written by Tim 55109998Smarkm * Hudson (tjh@cryptsoft.com). 56109998Smarkm * 57109998Smarkm */ 58160814Ssimon/* ==================================================================== 59160814Ssimon * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 60160814Ssimon * Portions of this software developed by SUN MICROSYSTEMS, INC., 61160814Ssimon * and contributed to the OpenSSL project. 62160814Ssimon */ 63109998Smarkm 64109998Smarkm#include <openssl/err.h> 65109998Smarkm 66238405Sjkim#ifdef OPENSSL_FIPS 67296341Sdelphij# include <openssl/fips.h> 68238405Sjkim#endif 69238405Sjkim 70109998Smarkm#include "ec_lcl.h" 71109998Smarkm 72109998Smarkmconst EC_METHOD *EC_GFp_mont_method(void) 73296341Sdelphij{ 74296341Sdelphij static const EC_METHOD ret = { 75296341Sdelphij EC_FLAGS_DEFAULT_OCT, 76296341Sdelphij NID_X9_62_prime_field, 77296341Sdelphij ec_GFp_mont_group_init, 78296341Sdelphij ec_GFp_mont_group_finish, 79296341Sdelphij ec_GFp_mont_group_clear_finish, 80296341Sdelphij ec_GFp_mont_group_copy, 81296341Sdelphij ec_GFp_mont_group_set_curve, 82296341Sdelphij ec_GFp_simple_group_get_curve, 83296341Sdelphij ec_GFp_simple_group_get_degree, 84296341Sdelphij ec_GFp_simple_group_check_discriminant, 85296341Sdelphij ec_GFp_simple_point_init, 86296341Sdelphij ec_GFp_simple_point_finish, 87296341Sdelphij ec_GFp_simple_point_clear_finish, 88296341Sdelphij ec_GFp_simple_point_copy, 89296341Sdelphij ec_GFp_simple_point_set_to_infinity, 90296341Sdelphij ec_GFp_simple_set_Jprojective_coordinates_GFp, 91296341Sdelphij ec_GFp_simple_get_Jprojective_coordinates_GFp, 92296341Sdelphij ec_GFp_simple_point_set_affine_coordinates, 93296341Sdelphij ec_GFp_simple_point_get_affine_coordinates, 94296341Sdelphij 0, 0, 0, 95296341Sdelphij ec_GFp_simple_add, 96296341Sdelphij ec_GFp_simple_dbl, 97296341Sdelphij ec_GFp_simple_invert, 98296341Sdelphij ec_GFp_simple_is_at_infinity, 99296341Sdelphij ec_GFp_simple_is_on_curve, 100296341Sdelphij ec_GFp_simple_cmp, 101296341Sdelphij ec_GFp_simple_make_affine, 102296341Sdelphij ec_GFp_simple_points_make_affine, 103296341Sdelphij 0 /* mul */ , 104296341Sdelphij 0 /* precompute_mult */ , 105296341Sdelphij 0 /* have_precompute_mult */ , 106296341Sdelphij ec_GFp_mont_field_mul, 107296341Sdelphij ec_GFp_mont_field_sqr, 108296341Sdelphij 0 /* field_div */ , 109296341Sdelphij ec_GFp_mont_field_encode, 110296341Sdelphij ec_GFp_mont_field_decode, 111296341Sdelphij ec_GFp_mont_field_set_to_one 112296341Sdelphij }; 113109998Smarkm 114273399Sdelphij#ifdef OPENSSL_FIPS 115296341Sdelphij if (FIPS_mode()) 116296341Sdelphij return fips_ec_gfp_mont_method(); 117273399Sdelphij#endif 118273399Sdelphij 119296341Sdelphij return &ret; 120296341Sdelphij} 121109998Smarkm 122109998Smarkmint ec_GFp_mont_group_init(EC_GROUP *group) 123296341Sdelphij{ 124296341Sdelphij int ok; 125109998Smarkm 126296341Sdelphij ok = ec_GFp_simple_group_init(group); 127296341Sdelphij group->field_data1 = NULL; 128296341Sdelphij group->field_data2 = NULL; 129296341Sdelphij return ok; 130296341Sdelphij} 131109998Smarkm 132109998Smarkmvoid ec_GFp_mont_group_finish(EC_GROUP *group) 133296341Sdelphij{ 134296341Sdelphij if (group->field_data1 != NULL) { 135296341Sdelphij BN_MONT_CTX_free(group->field_data1); 136296341Sdelphij group->field_data1 = NULL; 137296341Sdelphij } 138296341Sdelphij if (group->field_data2 != NULL) { 139296341Sdelphij BN_free(group->field_data2); 140296341Sdelphij group->field_data2 = NULL; 141296341Sdelphij } 142296341Sdelphij ec_GFp_simple_group_finish(group); 143296341Sdelphij} 144109998Smarkm 145109998Smarkmvoid ec_GFp_mont_group_clear_finish(EC_GROUP *group) 146296341Sdelphij{ 147296341Sdelphij if (group->field_data1 != NULL) { 148296341Sdelphij BN_MONT_CTX_free(group->field_data1); 149296341Sdelphij group->field_data1 = NULL; 150296341Sdelphij } 151296341Sdelphij if (group->field_data2 != NULL) { 152296341Sdelphij BN_clear_free(group->field_data2); 153296341Sdelphij group->field_data2 = NULL; 154296341Sdelphij } 155296341Sdelphij ec_GFp_simple_group_clear_finish(group); 156296341Sdelphij} 157109998Smarkm 158109998Smarkmint ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src) 159296341Sdelphij{ 160296341Sdelphij if (dest->field_data1 != NULL) { 161296341Sdelphij BN_MONT_CTX_free(dest->field_data1); 162296341Sdelphij dest->field_data1 = NULL; 163296341Sdelphij } 164296341Sdelphij if (dest->field_data2 != NULL) { 165296341Sdelphij BN_clear_free(dest->field_data2); 166296341Sdelphij dest->field_data2 = NULL; 167296341Sdelphij } 168109998Smarkm 169296341Sdelphij if (!ec_GFp_simple_group_copy(dest, src)) 170296341Sdelphij return 0; 171109998Smarkm 172296341Sdelphij if (src->field_data1 != NULL) { 173296341Sdelphij dest->field_data1 = BN_MONT_CTX_new(); 174296341Sdelphij if (dest->field_data1 == NULL) 175296341Sdelphij return 0; 176296341Sdelphij if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) 177296341Sdelphij goto err; 178296341Sdelphij } 179296341Sdelphij if (src->field_data2 != NULL) { 180296341Sdelphij dest->field_data2 = BN_dup(src->field_data2); 181296341Sdelphij if (dest->field_data2 == NULL) 182296341Sdelphij goto err; 183296341Sdelphij } 184109998Smarkm 185296341Sdelphij return 1; 186109998Smarkm 187109998Smarkm err: 188296341Sdelphij if (dest->field_data1 != NULL) { 189296341Sdelphij BN_MONT_CTX_free(dest->field_data1); 190296341Sdelphij dest->field_data1 = NULL; 191296341Sdelphij } 192296341Sdelphij return 0; 193296341Sdelphij} 194109998Smarkm 195296341Sdelphijint ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, 196296341Sdelphij const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) 197296341Sdelphij{ 198296341Sdelphij BN_CTX *new_ctx = NULL; 199296341Sdelphij BN_MONT_CTX *mont = NULL; 200296341Sdelphij BIGNUM *one = NULL; 201296341Sdelphij int ret = 0; 202109998Smarkm 203296341Sdelphij if (group->field_data1 != NULL) { 204296341Sdelphij BN_MONT_CTX_free(group->field_data1); 205296341Sdelphij group->field_data1 = NULL; 206296341Sdelphij } 207296341Sdelphij if (group->field_data2 != NULL) { 208296341Sdelphij BN_free(group->field_data2); 209296341Sdelphij group->field_data2 = NULL; 210296341Sdelphij } 211160814Ssimon 212296341Sdelphij if (ctx == NULL) { 213296341Sdelphij ctx = new_ctx = BN_CTX_new(); 214296341Sdelphij if (ctx == NULL) 215296341Sdelphij return 0; 216296341Sdelphij } 217160814Ssimon 218296341Sdelphij mont = BN_MONT_CTX_new(); 219296341Sdelphij if (mont == NULL) 220296341Sdelphij goto err; 221296341Sdelphij if (!BN_MONT_CTX_set(mont, p, ctx)) { 222296341Sdelphij ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB); 223296341Sdelphij goto err; 224296341Sdelphij } 225296341Sdelphij one = BN_new(); 226296341Sdelphij if (one == NULL) 227296341Sdelphij goto err; 228296341Sdelphij if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) 229296341Sdelphij goto err; 230160814Ssimon 231296341Sdelphij group->field_data1 = mont; 232296341Sdelphij mont = NULL; 233296341Sdelphij group->field_data2 = one; 234296341Sdelphij one = NULL; 235160814Ssimon 236296341Sdelphij ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx); 237160814Ssimon 238296341Sdelphij if (!ret) { 239296341Sdelphij BN_MONT_CTX_free(group->field_data1); 240296341Sdelphij group->field_data1 = NULL; 241296341Sdelphij BN_free(group->field_data2); 242296341Sdelphij group->field_data2 = NULL; 243296341Sdelphij } 244160814Ssimon 245160814Ssimon err: 246296341Sdelphij if (new_ctx != NULL) 247296341Sdelphij BN_CTX_free(new_ctx); 248296341Sdelphij if (mont != NULL) 249296341Sdelphij BN_MONT_CTX_free(mont); 250296341Sdelphij return ret; 251296341Sdelphij} 252160814Ssimon 253296341Sdelphijint ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, 254296341Sdelphij const BIGNUM *b, BN_CTX *ctx) 255296341Sdelphij{ 256296341Sdelphij if (group->field_data1 == NULL) { 257296341Sdelphij ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED); 258296341Sdelphij return 0; 259296341Sdelphij } 260160814Ssimon 261296341Sdelphij return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx); 262296341Sdelphij} 263109998Smarkm 264296341Sdelphijint ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, 265296341Sdelphij BN_CTX *ctx) 266296341Sdelphij{ 267296341Sdelphij if (group->field_data1 == NULL) { 268296341Sdelphij ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED); 269296341Sdelphij return 0; 270296341Sdelphij } 271109998Smarkm 272296341Sdelphij return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx); 273296341Sdelphij} 274109998Smarkm 275296341Sdelphijint ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, 276296341Sdelphij const BIGNUM *a, BN_CTX *ctx) 277296341Sdelphij{ 278296341Sdelphij if (group->field_data1 == NULL) { 279296341Sdelphij ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED); 280296341Sdelphij return 0; 281296341Sdelphij } 282109998Smarkm 283296341Sdelphij return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx); 284296341Sdelphij} 285109998Smarkm 286296341Sdelphijint ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, 287296341Sdelphij const BIGNUM *a, BN_CTX *ctx) 288296341Sdelphij{ 289296341Sdelphij if (group->field_data1 == NULL) { 290296341Sdelphij ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED); 291296341Sdelphij return 0; 292296341Sdelphij } 293109998Smarkm 294296341Sdelphij return BN_from_montgomery(r, a, group->field_data1, ctx); 295296341Sdelphij} 296109998Smarkm 297296341Sdelphijint ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, 298296341Sdelphij BN_CTX *ctx) 299296341Sdelphij{ 300296341Sdelphij if (group->field_data2 == NULL) { 301296341Sdelphij ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED); 302296341Sdelphij return 0; 303296341Sdelphij } 304109998Smarkm 305296341Sdelphij if (!BN_copy(r, group->field_data2)) 306296341Sdelphij return 0; 307296341Sdelphij return 1; 308296341Sdelphij} 309