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 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 return &ret; 118 #endif 119 } 120 121 122 int 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 } 131 132 133 void ec_GFp_mont_group_finish(EC_GROUP *group) 134 { 135 if (group->field_data1 != NULL) 136 { 137 BN_MONT_CTX_free(group->field_data1); 138 group->field_data1 = NULL; 139 } 140 if (group->field_data2 != NULL) 141 { 142 BN_free(group->field_data2); 143 group->field_data2 = NULL; 144 } 145 ec_GFp_simple_group_finish(group); 146 } 147 148 149 void ec_GFp_mont_group_clear_finish(EC_GROUP *group) 150 { 151 if (group->field_data1 != NULL) 152 { 153 BN_MONT_CTX_free(group->field_data1); 154 group->field_data1 = NULL; 155 } 156 if (group->field_data2 != NULL) 157 { 158 BN_clear_free(group->field_data2); 159 group->field_data2 = NULL; 160 } 161 ec_GFp_simple_group_clear_finish(group); 162 } 163 164 165 int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src) 166 { 167 if (dest->field_data1 != NULL) 168 { 169 BN_MONT_CTX_free(dest->field_data1); 170 dest->field_data1 = NULL; 171 } 172 if (dest->field_data2 != NULL) 173 { 174 BN_clear_free(dest->field_data2); 175 dest->field_data2 = NULL; 176 } 177 178 if (!ec_GFp_simple_group_copy(dest, src)) return 0; 179 180 if (src->field_data1 != NULL) 181 { 182 dest->field_data1 = BN_MONT_CTX_new(); 183 if (dest->field_data1 == NULL) return 0; 184 if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) goto err; 185 } 186 if (src->field_data2 != NULL) 187 { 188 dest->field_data2 = BN_dup(src->field_data2); 189 if (dest->field_data2 == NULL) goto err; 190 } 191 192 return 1; 193 194 err: 195 if (dest->field_data1 != NULL) 196 { 197 BN_MONT_CTX_free(dest->field_data1); 198 dest->field_data1 = NULL; 199 } 200 return 0; 201 } 202 203 204 int ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) 205 { 206 BN_CTX *new_ctx = NULL; 207 BN_MONT_CTX *mont = NULL; 208 BIGNUM *one = NULL; 209 int ret = 0; 210 211 if (group->field_data1 != NULL) 212 { 213 BN_MONT_CTX_free(group->field_data1); 214 group->field_data1 = NULL; 215 } 216 if (group->field_data2 != NULL) 217 { 218 BN_free(group->field_data2); 219 group->field_data2 = NULL; 220 } 221 222 if (ctx == NULL) 223 { 224 ctx = new_ctx = BN_CTX_new(); 225 if (ctx == NULL) 226 return 0; 227 } 228 229 mont = BN_MONT_CTX_new(); 230 if (mont == NULL) goto err; 231 if (!BN_MONT_CTX_set(mont, p, ctx)) 232 { 233 ECerr(EC_F_EC_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB); 234 goto err; 235 } 236 one = BN_new(); 237 if (one == NULL) goto err; 238 if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) goto err; 239 240 group->field_data1 = mont; 241 mont = NULL; 242 group->field_data2 = one; 243 one = NULL; 244 245 ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx); 246 247 if (!ret) 248 { 249 BN_MONT_CTX_free(group->field_data1); 250 group->field_data1 = NULL; 251 BN_free(group->field_data2); 252 group->field_data2 = NULL; 253 } 254 255 err: 256 if (new_ctx != NULL) 257 BN_CTX_free(new_ctx); 258 if (mont != NULL) 259 BN_MONT_CTX_free(mont); 260 return ret; 261 } 262 263 264 int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) 265 { 266 if (group->field_data1 == NULL) 267 { 268 ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED); 269 return 0; 270 } 271 272 return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx); 273 } 274 275 276 int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx) 277 { 278 if (group->field_data1 == NULL) 279 { 280 ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED); 281 return 0; 282 } 283 284 return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx); 285 } 286 287 288 int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx) 289 { 290 if (group->field_data1 == NULL) 291 { 292 ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED); 293 return 0; 294 } 295 296 return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx); 297 } 298 299 300 int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx) 301 { 302 if (group->field_data1 == NULL) 303 { 304 ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED); 305 return 0; 306 } 307 308 return BN_from_montgomery(r, a, group->field_data1, ctx); 309 } 310 311 312 int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx) 313 { 314 if (group->field_data2 == NULL) 315 { 316 ECerr(EC_F_EC_GFP_MONT_FIELD_SET_TO_ONE, EC_R_NOT_INITIALIZED); 317 return 0; 318 } 319 320 if (!BN_copy(r, group->field_data2)) return 0; 321 return 1; 322 } 323