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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh (at) 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 72 73 const EC_METHOD *EC_GFp_mont_method(void) 74 { 75 #ifdef OPENSSL_FIPS 76 return fips_ec_gfp_mont_method(); 77 #else 78 static const EC_METHOD ret = { 79 EC_FLAGS_DEFAULT_OCT, 80 NID_X9_62_prime_field, 81 ec_GFp_mont_group_init, 82 ec_GFp_mont_group_finish, 83 ec_GFp_mont_group_clear_finish, 84 ec_GFp_mont_group_copy, 85 ec_GFp_mont_group_set_curve, 86 ec_GFp_simple_group_get_curve, 87 ec_GFp_simple_group_get_degree, 88 ec_GFp_simple_group_check_discriminant, 89 ec_GFp_simple_point_init, 90 ec_GFp_simple_point_finish, 91 ec_GFp_simple_point_clear_finish, 92 ec_GFp_simple_point_copy, 93 ec_GFp_simple_point_set_to_infinity, 94 ec_GFp_simple_set_Jprojective_coordinates_GFp, 95 ec_GFp_simple_get_Jprojective_coordinates_GFp, 96 ec_GFp_simple_point_set_affine_coordinates, 97 ec_GFp_simple_point_get_affine_coordinates, 98 0,0,0, 99 ec_GFp_simple_add, 100 ec_GFp_simple_dbl, 101 ec_GFp_simple_invert, 102 ec_GFp_simple_is_at_infinity, 103 ec_GFp_simple_is_on_curve, 104 ec_GFp_simple_cmp, 105 ec_GFp_simple_make_affine, 106 ec_GFp_simple_points_make_affine, 107 0 /* mul */, 108 0 /* precompute_mult */, 109 0 /* have_precompute_mult */, 110 ec_GFp_mont_field_mul, 111 ec_GFp_mont_field_sqr, 112 0 /* field_div */, 113 ec_GFp_mont_field_encode, 114 ec_GFp_mont_field_decode, 115 ec_GFp_mont_field_set_to_one }; 116 117 118 return &ret; 119 #endif 120 } 121 122 123 int ec_GFp_mont_group_init(EC_GROUP *group) 124 { 125 int ok; 126 127 ok = ec_GFp_simple_group_init(group); 128 group->field_data1 = NULL; 129 group->field_data2 = NULL; 130 return ok; 131 } 132 133 134 void ec_GFp_mont_group_finish(EC_GROUP *group) 135 { 136 if (group->field_data1 != NULL) 137 { 138 BN_MONT_CTX_free(group->field_data1); 139 group->field_data1 = NULL; 140 } 141 if (group->field_data2 != NULL) 142 { 143 BN_free(group->field_data2); 144 group->field_data2 = NULL; 145 } 146 ec_GFp_simple_group_finish(group); 147 } 148 149 150 void ec_GFp_mont_group_clear_finish(EC_GROUP *group) 151 { 152 if (group->field_data1 != NULL) 153 { 154 BN_MONT_CTX_free(group->field_data1); 155 group->field_data1 = NULL; 156 } 157 if (group->field_data2 != NULL) 158 { 159 BN_clear_free(group->field_data2); 160 group->field_data2 = NULL; 161 } 162 ec_GFp_simple_group_clear_finish(group); 163 } 164 165 166 int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src) 167 { 168 if (dest->field_data1 != NULL) 169 { 170 BN_MONT_CTX_free(dest->field_data1); 171 dest->field_data1 = NULL; 172 } 173 if (dest->field_data2 != NULL) 174 { 175 BN_clear_free(dest->field_data2); 176 dest->field_data2 = NULL; 177 } 178 179 if (!ec_GFp_simple_group_copy(dest, src)) return 0; 180 181 if (src->field_data1 != NULL) 182 { 183 dest->field_data1 = BN_MONT_CTX_new(); 184 if (dest->field_data1 == NULL) return 0; 185 if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) goto err; 186 } 187 if (src->field_data2 != NULL) 188 { 189 dest->field_data2 = BN_dup(src->field_data2); 190 if (dest->field_data2 == NULL) goto err; 191 } 192 193 return 1; 194 195 err: 196 if (dest->field_data1 != NULL) 197 { 198 BN_MONT_CTX_free(dest->field_data1); 199 dest->field_data1 = NULL; 200 } 201 return 0; 202 } 203 204 205 int ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) 206 { 207 BN_CTX *new_ctx = NULL; 208 BN_MONT_CTX *mont = NULL; 209 BIGNUM *one = NULL; 210 int ret = 0; 211 212 if (group->field_data1 != NULL) 213 { 214 BN_MONT_CTX_free(group->field_data1); 215 group->field_data1 = NULL; 216 } 217 if (group->field_data2 != NULL) 218 { 219 BN_free(group->field_data2); 220 group->field_data2 = NULL; 221 } 222 223 if (ctx == NULL) 224 { 225 ctx = new_ctx = BN_CTX_new(); 226 if (ctx == NULL) 227 return 0; 228 } 229 230 mont = BN_MONT_CTX_new(); 231 if (mont == NULL) goto err; 232 if (!BN_MONT_CTX_set(mont, p, ctx)) 233 { 234 ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB); 235 goto err; 236 } 237 one = BN_new(); 238 if (one == NULL) goto err; 239 if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) goto err; 240 241 group->field_data1 = mont; 242 mont = NULL; 243 group->field_data2 = one; 244 one = NULL; 245 246 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx); 247 248 if (!ret) 249 { 250 BN_MONT_CTX_free(group->field_data1); 251 group->field_data1 = NULL; 252 BN_free(group->field_data2); 253 group->field_data2 = NULL; 254 } 255 256 err: 257 if (new_ctx != NULL) 258 BN_CTX_free(new_ctx); 259 if (mont != NULL) 260 BN_MONT_CTX_free(mont); 261 return ret; 262 } 263 264 265 int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) 266 { 267 if (group->field_data1 == NULL) 268 { 269 ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED); 270 return 0; 271 } 272 273 return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx); 274 } 275 276 277 int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx) 278 { 279 if (group->field_data1 == NULL) 280 { 281 ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED); 282 return 0; 283 } 284 285 return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx); 286 } 287 288 289 int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx) 290 { 291 if (group->field_data1 == NULL) 292 { 293 ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED); 294 return 0; 295 } 296 297 return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx); 298 } 299 300 301 int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx) 302 { 303 if (group->field_data1 == NULL) 304 { 305 ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED); 306 return 0; 307 } 308 309 return BN_from_montgomery(r, a, group->field_data1, ctx); 310 } 311 312 313 int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx) 314 { 315 if (group->field_data2 == NULL) 316 { 317 ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED); 318 return 0; 319 } 320 321 if (!BN_copy(r, group->field_data2)) return 0; 322 return 1; 323 } 324
