Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* crypto/ec/ec_key.c */ |
| 2 | /* |
| 3 | * Written by Nils Larsch for the OpenSSL project. |
| 4 | */ |
| 5 | /* ==================================================================== |
| 6 | * Copyright (c) 1998-2005 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 originally developed by SUN MICROSYSTEMS, INC., and |
| 61 | * contributed to the OpenSSL project. |
| 62 | */ |
| 63 | |
| 64 | #include <string.h> |
| 65 | #include "ec_lcl.h" |
| 66 | #include <openssl/err.h> |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 67 | #include <string.h> |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 68 | |
| 69 | EC_KEY *EC_KEY_new(void) |
| 70 | { |
| 71 | EC_KEY *ret; |
| 72 | |
| 73 | ret=(EC_KEY *)OPENSSL_malloc(sizeof(EC_KEY)); |
| 74 | if (ret == NULL) |
| 75 | { |
| 76 | ECerr(EC_F_EC_KEY_NEW, ERR_R_MALLOC_FAILURE); |
| 77 | return(NULL); |
| 78 | } |
| 79 | |
| 80 | ret->version = 1; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 81 | ret->group = NULL; |
| 82 | ret->pub_key = NULL; |
| 83 | ret->priv_key= NULL; |
| 84 | ret->enc_flag= 0; |
| 85 | ret->conv_form = POINT_CONVERSION_UNCOMPRESSED; |
| 86 | ret->references= 1; |
| 87 | ret->method_data = NULL; |
| 88 | return(ret); |
| 89 | } |
| 90 | |
| 91 | EC_KEY *EC_KEY_new_by_curve_name(int nid) |
| 92 | { |
| 93 | EC_KEY *ret = EC_KEY_new(); |
| 94 | if (ret == NULL) |
| 95 | return NULL; |
| 96 | ret->group = EC_GROUP_new_by_curve_name(nid); |
| 97 | if (ret->group == NULL) |
| 98 | { |
| 99 | EC_KEY_free(ret); |
| 100 | return NULL; |
| 101 | } |
| 102 | return ret; |
| 103 | } |
| 104 | |
| 105 | void EC_KEY_free(EC_KEY *r) |
| 106 | { |
| 107 | int i; |
| 108 | |
| 109 | if (r == NULL) return; |
| 110 | |
| 111 | i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_EC); |
| 112 | #ifdef REF_PRINT |
| 113 | REF_PRINT("EC_KEY",r); |
| 114 | #endif |
| 115 | if (i > 0) return; |
| 116 | #ifdef REF_CHECK |
| 117 | if (i < 0) |
| 118 | { |
| 119 | fprintf(stderr,"EC_KEY_free, bad reference count\n"); |
| 120 | abort(); |
| 121 | } |
| 122 | #endif |
| 123 | |
| 124 | if (r->group != NULL) |
| 125 | EC_GROUP_free(r->group); |
| 126 | if (r->pub_key != NULL) |
| 127 | EC_POINT_free(r->pub_key); |
| 128 | if (r->priv_key != NULL) |
| 129 | BN_clear_free(r->priv_key); |
| 130 | |
| 131 | EC_EX_DATA_free_all_data(&r->method_data); |
| 132 | |
| 133 | OPENSSL_cleanse((void *)r, sizeof(EC_KEY)); |
| 134 | |
| 135 | OPENSSL_free(r); |
| 136 | } |
| 137 | |
| 138 | EC_KEY *EC_KEY_copy(EC_KEY *dest, const EC_KEY *src) |
| 139 | { |
| 140 | EC_EXTRA_DATA *d; |
| 141 | |
| 142 | if (dest == NULL || src == NULL) |
| 143 | { |
| 144 | ECerr(EC_F_EC_KEY_COPY, ERR_R_PASSED_NULL_PARAMETER); |
| 145 | return NULL; |
| 146 | } |
| 147 | /* copy the parameters */ |
| 148 | if (src->group) |
| 149 | { |
| 150 | const EC_METHOD *meth = EC_GROUP_method_of(src->group); |
| 151 | /* clear the old group */ |
| 152 | if (dest->group) |
| 153 | EC_GROUP_free(dest->group); |
| 154 | dest->group = EC_GROUP_new(meth); |
| 155 | if (dest->group == NULL) |
| 156 | return NULL; |
| 157 | if (!EC_GROUP_copy(dest->group, src->group)) |
| 158 | return NULL; |
| 159 | } |
| 160 | /* copy the public key */ |
| 161 | if (src->pub_key && src->group) |
| 162 | { |
| 163 | if (dest->pub_key) |
| 164 | EC_POINT_free(dest->pub_key); |
| 165 | dest->pub_key = EC_POINT_new(src->group); |
| 166 | if (dest->pub_key == NULL) |
| 167 | return NULL; |
| 168 | if (!EC_POINT_copy(dest->pub_key, src->pub_key)) |
| 169 | return NULL; |
| 170 | } |
| 171 | /* copy the private key */ |
| 172 | if (src->priv_key) |
| 173 | { |
| 174 | if (dest->priv_key == NULL) |
| 175 | { |
| 176 | dest->priv_key = BN_new(); |
| 177 | if (dest->priv_key == NULL) |
| 178 | return NULL; |
| 179 | } |
| 180 | if (!BN_copy(dest->priv_key, src->priv_key)) |
| 181 | return NULL; |
| 182 | } |
| 183 | /* copy method/extra data */ |
| 184 | EC_EX_DATA_free_all_data(&dest->method_data); |
| 185 | |
| 186 | for (d = src->method_data; d != NULL; d = d->next) |
| 187 | { |
| 188 | void *t = d->dup_func(d->data); |
| 189 | |
| 190 | if (t == NULL) |
| 191 | return 0; |
| 192 | if (!EC_EX_DATA_set_data(&dest->method_data, t, d->dup_func, d->free_func, d->clear_free_func)) |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | /* copy the rest */ |
| 197 | dest->enc_flag = src->enc_flag; |
| 198 | dest->conv_form = src->conv_form; |
| 199 | dest->version = src->version; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 200 | |
| 201 | return dest; |
| 202 | } |
| 203 | |
| 204 | EC_KEY *EC_KEY_dup(const EC_KEY *ec_key) |
| 205 | { |
| 206 | EC_KEY *ret = EC_KEY_new(); |
| 207 | if (ret == NULL) |
| 208 | return NULL; |
| 209 | if (EC_KEY_copy(ret, ec_key) == NULL) |
| 210 | { |
| 211 | EC_KEY_free(ret); |
| 212 | return NULL; |
| 213 | } |
| 214 | return ret; |
| 215 | } |
| 216 | |
| 217 | int EC_KEY_up_ref(EC_KEY *r) |
| 218 | { |
| 219 | int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_EC); |
| 220 | #ifdef REF_PRINT |
| 221 | REF_PRINT("EC_KEY",r); |
| 222 | #endif |
| 223 | #ifdef REF_CHECK |
| 224 | if (i < 2) |
| 225 | { |
| 226 | fprintf(stderr, "EC_KEY_up, bad reference count\n"); |
| 227 | abort(); |
| 228 | } |
| 229 | #endif |
| 230 | return ((i > 1) ? 1 : 0); |
| 231 | } |
| 232 | |
| 233 | int EC_KEY_generate_key(EC_KEY *eckey) |
| 234 | { |
| 235 | int ok = 0; |
| 236 | BN_CTX *ctx = NULL; |
| 237 | BIGNUM *priv_key = NULL, *order = NULL; |
| 238 | EC_POINT *pub_key = NULL; |
| 239 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 240 | if (!eckey || !eckey->group) |
| 241 | { |
| 242 | ECerr(EC_F_EC_KEY_GENERATE_KEY, ERR_R_PASSED_NULL_PARAMETER); |
| 243 | return 0; |
| 244 | } |
| 245 | |
| 246 | if ((order = BN_new()) == NULL) goto err; |
| 247 | if ((ctx = BN_CTX_new()) == NULL) goto err; |
| 248 | |
| 249 | if (eckey->priv_key == NULL) |
| 250 | { |
| 251 | priv_key = BN_new(); |
| 252 | if (priv_key == NULL) |
| 253 | goto err; |
| 254 | } |
| 255 | else |
| 256 | priv_key = eckey->priv_key; |
| 257 | |
| 258 | if (!EC_GROUP_get_order(eckey->group, order, ctx)) |
| 259 | goto err; |
| 260 | |
| 261 | do |
| 262 | if (!BN_rand_range(priv_key, order)) |
| 263 | goto err; |
| 264 | while (BN_is_zero(priv_key)); |
| 265 | |
| 266 | if (eckey->pub_key == NULL) |
| 267 | { |
| 268 | pub_key = EC_POINT_new(eckey->group); |
| 269 | if (pub_key == NULL) |
| 270 | goto err; |
| 271 | } |
| 272 | else |
| 273 | pub_key = eckey->pub_key; |
| 274 | |
| 275 | if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, ctx)) |
| 276 | goto err; |
| 277 | |
| 278 | eckey->priv_key = priv_key; |
| 279 | eckey->pub_key = pub_key; |
| 280 | |
| 281 | ok=1; |
| 282 | |
| 283 | err: |
| 284 | if (order) |
| 285 | BN_free(order); |
| 286 | if (pub_key != NULL && eckey->pub_key == NULL) |
| 287 | EC_POINT_free(pub_key); |
| 288 | if (priv_key != NULL && eckey->priv_key == NULL) |
| 289 | BN_free(priv_key); |
| 290 | if (ctx != NULL) |
| 291 | BN_CTX_free(ctx); |
| 292 | return(ok); |
| 293 | } |
| 294 | |
| 295 | int EC_KEY_check_key(const EC_KEY *eckey) |
| 296 | { |
| 297 | int ok = 0; |
| 298 | BN_CTX *ctx = NULL; |
| 299 | const BIGNUM *order = NULL; |
| 300 | EC_POINT *point = NULL; |
| 301 | |
| 302 | if (!eckey || !eckey->group || !eckey->pub_key) |
| 303 | { |
| 304 | ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER); |
| 305 | return 0; |
| 306 | } |
| 307 | |
| 308 | if (EC_POINT_is_at_infinity(eckey->group, eckey->pub_key)) |
| 309 | { |
| 310 | ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_POINT_AT_INFINITY); |
| 311 | goto err; |
| 312 | } |
| 313 | |
| 314 | if ((ctx = BN_CTX_new()) == NULL) |
| 315 | goto err; |
| 316 | if ((point = EC_POINT_new(eckey->group)) == NULL) |
| 317 | goto err; |
| 318 | |
| 319 | /* testing whether the pub_key is on the elliptic curve */ |
| 320 | if (!EC_POINT_is_on_curve(eckey->group, eckey->pub_key, ctx)) |
| 321 | { |
| 322 | ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_POINT_IS_NOT_ON_CURVE); |
| 323 | goto err; |
| 324 | } |
| 325 | /* testing whether pub_key * order is the point at infinity */ |
| 326 | order = &eckey->group->order; |
| 327 | if (BN_is_zero(order)) |
| 328 | { |
| 329 | ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_GROUP_ORDER); |
| 330 | goto err; |
| 331 | } |
| 332 | if (!EC_POINT_mul(eckey->group, point, NULL, eckey->pub_key, order, ctx)) |
| 333 | { |
| 334 | ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB); |
| 335 | goto err; |
| 336 | } |
| 337 | if (!EC_POINT_is_at_infinity(eckey->group, point)) |
| 338 | { |
| 339 | ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_WRONG_ORDER); |
| 340 | goto err; |
| 341 | } |
| 342 | /* in case the priv_key is present : |
| 343 | * check if generator * priv_key == pub_key |
| 344 | */ |
| 345 | if (eckey->priv_key) |
| 346 | { |
| 347 | if (BN_cmp(eckey->priv_key, order) >= 0) |
| 348 | { |
| 349 | ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_WRONG_ORDER); |
| 350 | goto err; |
| 351 | } |
| 352 | if (!EC_POINT_mul(eckey->group, point, eckey->priv_key, |
| 353 | NULL, NULL, ctx)) |
| 354 | { |
| 355 | ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB); |
| 356 | goto err; |
| 357 | } |
| 358 | if (EC_POINT_cmp(eckey->group, point, eckey->pub_key, |
| 359 | ctx) != 0) |
| 360 | { |
| 361 | ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_PRIVATE_KEY); |
| 362 | goto err; |
| 363 | } |
| 364 | } |
| 365 | ok = 1; |
| 366 | err: |
| 367 | if (ctx != NULL) |
| 368 | BN_CTX_free(ctx); |
| 369 | if (point != NULL) |
| 370 | EC_POINT_free(point); |
| 371 | return(ok); |
| 372 | } |
| 373 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 374 | const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key) |
| 375 | { |
| 376 | return key->group; |
| 377 | } |
| 378 | |
| 379 | int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group) |
| 380 | { |
| 381 | if (key->group != NULL) |
| 382 | EC_GROUP_free(key->group); |
| 383 | key->group = EC_GROUP_dup(group); |
| 384 | return (key->group == NULL) ? 0 : 1; |
| 385 | } |
| 386 | |
| 387 | const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key) |
| 388 | { |
| 389 | return key->priv_key; |
| 390 | } |
| 391 | |
| 392 | int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *priv_key) |
| 393 | { |
| 394 | if (key->priv_key) |
| 395 | BN_clear_free(key->priv_key); |
| 396 | key->priv_key = BN_dup(priv_key); |
| 397 | return (key->priv_key == NULL) ? 0 : 1; |
| 398 | } |
| 399 | |
| 400 | const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key) |
| 401 | { |
| 402 | return key->pub_key; |
| 403 | } |
| 404 | |
| 405 | int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub_key) |
| 406 | { |
| 407 | if (key->pub_key != NULL) |
| 408 | EC_POINT_free(key->pub_key); |
| 409 | key->pub_key = EC_POINT_dup(pub_key, key->group); |
| 410 | return (key->pub_key == NULL) ? 0 : 1; |
| 411 | } |
| 412 | |
| 413 | unsigned int EC_KEY_get_enc_flags(const EC_KEY *key) |
| 414 | { |
| 415 | return key->enc_flag; |
| 416 | } |
| 417 | |
| 418 | void EC_KEY_set_enc_flags(EC_KEY *key, unsigned int flags) |
| 419 | { |
| 420 | key->enc_flag = flags; |
| 421 | } |
| 422 | |
| 423 | point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key) |
| 424 | { |
| 425 | return key->conv_form; |
| 426 | } |
| 427 | |
| 428 | void EC_KEY_set_conv_form(EC_KEY *key, point_conversion_form_t cform) |
| 429 | { |
| 430 | key->conv_form = cform; |
| 431 | if (key->group != NULL) |
| 432 | EC_GROUP_set_point_conversion_form(key->group, cform); |
| 433 | } |
| 434 | |
| 435 | void *EC_KEY_get_key_method_data(EC_KEY *key, |
| 436 | void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *)) |
| 437 | { |
| 438 | return EC_EX_DATA_get_data(key->method_data, dup_func, free_func, clear_free_func); |
| 439 | } |
| 440 | |
| 441 | void EC_KEY_insert_key_method_data(EC_KEY *key, void *data, |
| 442 | void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *)) |
| 443 | { |
| 444 | EC_EXTRA_DATA *ex_data; |
| 445 | CRYPTO_w_lock(CRYPTO_LOCK_EC); |
| 446 | ex_data = EC_EX_DATA_get_data(key->method_data, dup_func, free_func, clear_free_func); |
| 447 | if (ex_data == NULL) |
| 448 | EC_EX_DATA_set_data(&key->method_data, data, dup_func, free_func, clear_free_func); |
| 449 | CRYPTO_w_unlock(CRYPTO_LOCK_EC); |
| 450 | } |
| 451 | |
| 452 | void EC_KEY_set_asn1_flag(EC_KEY *key, int flag) |
| 453 | { |
| 454 | if (key->group != NULL) |
| 455 | EC_GROUP_set_asn1_flag(key->group, flag); |
| 456 | } |
| 457 | |
| 458 | int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx) |
| 459 | { |
| 460 | if (key->group == NULL) |
| 461 | return 0; |
| 462 | return EC_GROUP_precompute_mult(key->group, ctx); |
| 463 | } |