1/* crypto/ec/ecp_mont.c */ 2/* 3 * Originally written by Bodo Moeller for the OpenSSL project. 4 */ 5/* ==================================================================== 6 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * openssl-core@openssl.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay@cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh@cryptsoft.com). 56 * 57 */ 58/* ==================================================================== 59 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 60 * Portions of this software developed by SUN MICROSYSTEMS, INC., 61 * and contributed to the OpenSSL project. 62 */ 63 64#include <openssl/err.h> 65 66#ifdef OPENSSL_FIPS 67# include <openssl/fips.h> 68#endif 69 70#include "ec_lcl.h" 71 72const EC_METHOD *EC_GFp_mont_method(void) 73{ 74 static const EC_METHOD ret = { 75 EC_FLAGS_DEFAULT_OCT, 76 NID_X9_62_prime_field, 77 ec_GFp_mont_group_init, 78 ec_GFp_mont_group_finish, 79 ec_GFp_mont_group_clear_finish, 80 ec_GFp_mont_group_copy, 81 ec_GFp_mont_group_set_curve, 82 ec_GFp_simple_group_get_curve, 83 ec_GFp_simple_group_get_degree, 84 ec_GFp_simple_group_check_discriminant, 85 ec_GFp_simple_point_init, 86 ec_GFp_simple_point_finish, 87 ec_GFp_simple_point_clear_finish, 88 ec_GFp_simple_point_copy, 89 ec_GFp_simple_point_set_to_infinity, 90 ec_GFp_simple_set_Jprojective_coordinates_GFp, 91 ec_GFp_simple_get_Jprojective_coordinates_GFp, 92 ec_GFp_simple_point_set_affine_coordinates, 93 ec_GFp_simple_point_get_affine_coordinates, 94 0, 0, 0, 95 ec_GFp_simple_add, 96 ec_GFp_simple_dbl, 97 ec_GFp_simple_invert, 98 ec_GFp_simple_is_at_infinity, 99 ec_GFp_simple_is_on_curve, 100 ec_GFp_simple_cmp, 101 ec_GFp_simple_make_affine, 102 ec_GFp_simple_points_make_affine, 103 0 /* mul */ , 104 0 /* precompute_mult */ , 105 0 /* have_precompute_mult */ , 106 ec_GFp_mont_field_mul, 107 ec_GFp_mont_field_sqr, 108 0 /* field_div */ , 109 ec_GFp_mont_field_encode, 110 ec_GFp_mont_field_decode, 111 ec_GFp_mont_field_set_to_one 112 }; 113 114#ifdef OPENSSL_FIPS 115 if (FIPS_mode()) 116 return fips_ec_gfp_mont_method(); 117#endif 118 119 return &ret; 120} 121 122int ec_GFp_mont_group_init(EC_GROUP *group) 123{ 124 int ok; 125 126 ok = ec_GFp_simple_group_init(group); 127 group->field_data1 = NULL; 128 group->field_data2 = NULL; 129 return ok; 130} 131 132void ec_GFp_mont_group_finish(EC_GROUP *group) 133{ 134 if (group->field_data1 != NULL) { 135 BN_MONT_CTX_free(group->field_data1); 136 group->field_data1 = NULL; 137 } 138 if (group->field_data2 != NULL) { 139 BN_free(group->field_data2); 140 group->field_data2 = NULL; 141 } 142 ec_GFp_simple_group_finish(group); 143} 144 145void ec_GFp_mont_group_clear_finish(EC_GROUP *group) 146{ 147 if (group->field_data1 != NULL) { 148 BN_MONT_CTX_free(group->field_data1); 149 group->field_data1 = NULL; 150 } 151 if (group->field_data2 != NULL) { 152 BN_clear_free(group->field_data2); 153 group->field_data2 = NULL; 154 } 155 ec_GFp_simple_group_clear_finish(group); 156} 157 158int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src) 159{ 160 if (dest->field_data1 != NULL) { 161 BN_MONT_CTX_free(dest->field_data1); 162 dest->field_data1 = NULL; 163 } 164 if (dest->field_data2 != NULL) { 165 BN_clear_free(dest->field_data2); 166 dest->field_data2 = NULL; 167 } 168 169 if (!ec_GFp_simple_group_copy(dest, src)) 170 return 0; 171 172 if (src->field_data1 != NULL) { 173 dest->field_data1 = BN_MONT_CTX_new(); 174 if (dest->field_data1 == NULL) 175 return 0; 176 if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) 177 goto err; 178 } 179 if (src->field_data2 != NULL) { 180 dest->field_data2 = BN_dup(src->field_data2); 181 if (dest->field_data2 == NULL) 182 goto err; 183 } 184 185 return 1; 186 187 err: 188 if (dest->field_data1 != NULL) { 189 BN_MONT_CTX_free(dest->field_data1); 190 dest->field_data1 = NULL; 191 } 192 return 0; 193} 194 195int ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, 196 const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) 197{ 198 BN_CTX *new_ctx = NULL; 199 BN_MONT_CTX *mont = NULL; 200 BIGNUM *one = NULL; 201 int ret = 0; 202 203 if (group->field_data1 != NULL) { 204 BN_MONT_CTX_free(group->field_data1); 205 group->field_data1 = NULL; 206 } 207 if (group->field_data2 != NULL) { 208 BN_free(group->field_data2); 209 group->field_data2 = NULL; 210 } 211 212 if (ctx == NULL) { 213 ctx = new_ctx = BN_CTX_new(); 214 if (ctx == NULL) 215 return 0; 216 } 217 218 mont = BN_MONT_CTX_new(); 219 if (mont == NULL) 220 goto err; 221 if (!BN_MONT_CTX_set(mont, p, ctx)) { 222 ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB); 223 goto err; 224 } 225 one = BN_new(); 226 if (one == NULL) 227 goto err; 228 if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) 229 goto err; 230 231 group->field_data1 = mont; 232 mont = NULL; 233 group->field_data2 = one; 234 one = NULL; 235 236 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx); 237 238 if (!ret) { 239 BN_MONT_CTX_free(group->field_data1); 240 group->field_data1 = NULL; 241 BN_free(group->field_data2); 242 group->field_data2 = NULL; 243 } 244 245 err: 246 if (new_ctx != NULL) 247 BN_CTX_free(new_ctx); 248 if (mont != NULL) 249 BN_MONT_CTX_free(mont); 250 if (one != NULL) 251 BN_free(one); 252 return ret; 253} 254 255int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, 256 const BIGNUM *b, BN_CTX *ctx) 257{ 258 if (group->field_data1 == NULL) { 259 ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED); 260 return 0; 261 } 262 263 return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx); 264} 265 266int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, 267 BN_CTX *ctx) 268{ 269 if (group->field_data1 == NULL) { 270 ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED); 271 return 0; 272 } 273 274 return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx); 275} 276 277int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, 278 const BIGNUM *a, BN_CTX *ctx) 279{ 280 if (group->field_data1 == NULL) { 281 ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED); 282 return 0; 283 } 284 285 return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx); 286} 287 288int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, 289 const BIGNUM *a, BN_CTX *ctx) 290{ 291 if (group->field_data1 == NULL) { 292 ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED); 293 return 0; 294 } 295 296 return BN_from_montgomery(r, a, group->field_data1, ctx); 297} 298 299int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, 300 BN_CTX *ctx) 301{ 302 if (group->field_data2 == NULL) { 303 ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED); 304 return 0; 305 } 306 307 if (!BN_copy(r, group->field_data2)) 308 return 0; 309 return 1; 310} 311