Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame^] | 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 | |
| 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 | } |