ecdsatest.c revision 296341
1/* crypto/ecdsa/ecdsatest.c */ 2/* 3 * Written by Nils Larsch for the OpenSSL project. 4 */ 5/* ==================================================================== 6 * Copyright (c) 2000-2005 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 * licensing@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 * 61 * Portions of the attached software ("Contribution") are developed by 62 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. 63 * 64 * The Contribution is licensed pursuant to the OpenSSL open source 65 * license provided above. 66 * 67 * The elliptic curve binary polynomial software is originally written by 68 * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems Laboratories. 69 * 70 */ 71 72#include <stdio.h> 73#include <stdlib.h> 74#include <string.h> 75 76#include <openssl/opensslconf.h> /* To see if OPENSSL_NO_ECDSA is defined */ 77 78#ifdef OPENSSL_NO_ECDSA 79int main(int argc, char *argv[]) 80{ 81 puts("Elliptic curves are disabled."); 82 return 0; 83} 84#else 85 86# include <openssl/crypto.h> 87# include <openssl/bio.h> 88# include <openssl/evp.h> 89# include <openssl/bn.h> 90# include <openssl/ecdsa.h> 91# ifndef OPENSSL_NO_ENGINE 92# include <openssl/engine.h> 93# endif 94# include <openssl/err.h> 95# include <openssl/rand.h> 96 97static const char rnd_seed[] = "string to make the random number generator " 98 "think it has entropy"; 99 100/* declaration of the test functions */ 101int x9_62_tests(BIO *); 102int x9_62_test_internal(BIO *out, int nid, const char *r, const char *s); 103int test_builtin(BIO *); 104 105/* functions to change the RAND_METHOD */ 106int change_rand(void); 107int restore_rand(void); 108int fbytes(unsigned char *buf, int num); 109 110RAND_METHOD fake_rand; 111const RAND_METHOD *old_rand; 112 113int change_rand(void) 114{ 115 /* save old rand method */ 116 if ((old_rand = RAND_get_rand_method()) == NULL) 117 return 0; 118 119 fake_rand.seed = old_rand->seed; 120 fake_rand.cleanup = old_rand->cleanup; 121 fake_rand.add = old_rand->add; 122 fake_rand.status = old_rand->status; 123 /* use own random function */ 124 fake_rand.bytes = fbytes; 125 fake_rand.pseudorand = old_rand->bytes; 126 /* set new RAND_METHOD */ 127 if (!RAND_set_rand_method(&fake_rand)) 128 return 0; 129 return 1; 130} 131 132int restore_rand(void) 133{ 134 if (!RAND_set_rand_method(old_rand)) 135 return 0; 136 else 137 return 1; 138} 139 140static int fbytes_counter = 0; 141static const char *numbers[8] = { 142 "651056770906015076056810763456358567190100156695615665659", 143 "6140507067065001063065065565667405560006161556565665656654", 144 "8763001015071075675010661307616710783570106710677817767166" 145 "71676178726717", 146 "7000000175690566466555057817571571075705015757757057795755" 147 "55657156756655", 148 "1275552191113212300012030439187146164646146646466749494799", 149 "1542725565216523985789236956265265265235675811949404040041", 150 "1456427555219115346513212300075341203043918714616464614664" 151 "64667494947990", 152 "1712787255652165239672857892369562652652652356758119494040" 153 "40041670216363" 154}; 155 156int fbytes(unsigned char *buf, int num) 157{ 158 int ret; 159 BIGNUM *tmp = NULL; 160 161 if (fbytes_counter >= 8) 162 return 0; 163 tmp = BN_new(); 164 if (!tmp) 165 return 0; 166 if (!BN_dec2bn(&tmp, numbers[fbytes_counter])) { 167 BN_free(tmp); 168 return 0; 169 } 170 fbytes_counter++; 171 if (num != BN_num_bytes(tmp) || !BN_bn2bin(tmp, buf)) 172 ret = 0; 173 else 174 ret = 1; 175 if (tmp) 176 BN_free(tmp); 177 return ret; 178} 179 180/* some tests from the X9.62 draft */ 181int x9_62_test_internal(BIO *out, int nid, const char *r_in, const char *s_in) 182{ 183 int ret = 0; 184 const char message[] = "abc"; 185 unsigned char digest[20]; 186 unsigned int dgst_len = 0; 187 EVP_MD_CTX md_ctx; 188 EC_KEY *key = NULL; 189 ECDSA_SIG *signature = NULL; 190 BIGNUM *r = NULL, *s = NULL; 191 192 EVP_MD_CTX_init(&md_ctx); 193 /* get the message digest */ 194 EVP_DigestInit(&md_ctx, EVP_ecdsa()); 195 EVP_DigestUpdate(&md_ctx, (const void *)message, 3); 196 EVP_DigestFinal(&md_ctx, digest, &dgst_len); 197 198 BIO_printf(out, "testing %s: ", OBJ_nid2sn(nid)); 199 /* create the key */ 200 if ((key = EC_KEY_new_by_curve_name(nid)) == NULL) 201 goto x962_int_err; 202 if (!EC_KEY_generate_key(key)) 203 goto x962_int_err; 204 BIO_printf(out, "."); 205 (void)BIO_flush(out); 206 /* create the signature */ 207 signature = ECDSA_do_sign(digest, 20, key); 208 if (signature == NULL) 209 goto x962_int_err; 210 BIO_printf(out, "."); 211 (void)BIO_flush(out); 212 /* compare the created signature with the expected signature */ 213 if ((r = BN_new()) == NULL || (s = BN_new()) == NULL) 214 goto x962_int_err; 215 if (!BN_dec2bn(&r, r_in) || !BN_dec2bn(&s, s_in)) 216 goto x962_int_err; 217 if (BN_cmp(signature->r, r) || BN_cmp(signature->s, s)) 218 goto x962_int_err; 219 BIO_printf(out, "."); 220 (void)BIO_flush(out); 221 /* verify the signature */ 222 if (ECDSA_do_verify(digest, 20, signature, key) != 1) 223 goto x962_int_err; 224 BIO_printf(out, "."); 225 (void)BIO_flush(out); 226 227 BIO_printf(out, " ok\n"); 228 ret = 1; 229 x962_int_err: 230 if (!ret) 231 BIO_printf(out, " failed\n"); 232 if (key) 233 EC_KEY_free(key); 234 if (signature) 235 ECDSA_SIG_free(signature); 236 if (r) 237 BN_free(r); 238 if (s) 239 BN_free(s); 240 EVP_MD_CTX_cleanup(&md_ctx); 241 return ret; 242} 243 244int x9_62_tests(BIO *out) 245{ 246 int ret = 0; 247 248 BIO_printf(out, "some tests from X9.62:\n"); 249 250 /* set own rand method */ 251 if (!change_rand()) 252 goto x962_err; 253 254 if (!x9_62_test_internal(out, NID_X9_62_prime192v1, 255 "3342403536405981729393488334694600415596881826869351677613", 256 "5735822328888155254683894997897571951568553642892029982342")) 257 goto x962_err; 258 if (!x9_62_test_internal(out, NID_X9_62_prime239v1, 259 "3086361431751678114926225473006680188549593787585317781474" 260 "62058306432176", 261 "3238135532097973577080787768312505059318910517550078427819" 262 "78505179448783")) 263 goto x962_err; 264# ifndef OPENSSL_NO_EC2M 265 if (!x9_62_test_internal(out, NID_X9_62_c2tnb191v1, 266 "87194383164871543355722284926904419997237591535066528048", 267 "308992691965804947361541664549085895292153777025772063598")) 268 goto x962_err; 269 if (!x9_62_test_internal(out, NID_X9_62_c2tnb239v1, 270 "2159633321041961198501834003903461262881815148684178964245" 271 "5876922391552", 272 "1970303740007316867383349976549972270528498040721988191026" 273 "49413465737174")) 274 goto x962_err; 275# endif 276 ret = 1; 277 x962_err: 278 if (!restore_rand()) 279 ret = 0; 280 return ret; 281} 282 283int test_builtin(BIO *out) 284{ 285 EC_builtin_curve *curves = NULL; 286 size_t crv_len = 0, n = 0; 287 EC_KEY *eckey = NULL, *wrong_eckey = NULL; 288 EC_GROUP *group; 289 ECDSA_SIG *ecdsa_sig = NULL; 290 unsigned char digest[20], wrong_digest[20]; 291 unsigned char *signature = NULL; 292 const unsigned char *sig_ptr; 293 unsigned char *sig_ptr2; 294 unsigned char *raw_buf = NULL; 295 unsigned int sig_len, degree, r_len, s_len, bn_len, buf_len; 296 int nid, ret = 0; 297 298 /* fill digest values with some random data */ 299 if (RAND_pseudo_bytes(digest, 20) <= 0 || 300 RAND_pseudo_bytes(wrong_digest, 20) <= 0) { 301 BIO_printf(out, "ERROR: unable to get random data\n"); 302 goto builtin_err; 303 } 304 305 /* 306 * create and verify a ecdsa signature with every availble curve (with ) 307 */ 308 BIO_printf(out, "\ntesting ECDSA_sign() and ECDSA_verify() " 309 "with some internal curves:\n"); 310 311 /* get a list of all internal curves */ 312 crv_len = EC_get_builtin_curves(NULL, 0); 313 314 curves = OPENSSL_malloc(sizeof(EC_builtin_curve) * crv_len); 315 316 if (curves == NULL) { 317 BIO_printf(out, "malloc error\n"); 318 goto builtin_err; 319 } 320 321 if (!EC_get_builtin_curves(curves, crv_len)) { 322 BIO_printf(out, "unable to get internal curves\n"); 323 goto builtin_err; 324 } 325 326 /* now create and verify a signature for every curve */ 327 for (n = 0; n < crv_len; n++) { 328 unsigned char dirt, offset; 329 330 nid = curves[n].nid; 331 if (nid == NID_ipsec4) 332 continue; 333 /* create new ecdsa key (== EC_KEY) */ 334 if ((eckey = EC_KEY_new()) == NULL) 335 goto builtin_err; 336 group = EC_GROUP_new_by_curve_name(nid); 337 if (group == NULL) 338 goto builtin_err; 339 if (EC_KEY_set_group(eckey, group) == 0) 340 goto builtin_err; 341 EC_GROUP_free(group); 342 degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey)); 343 if (degree < 160) 344 /* drop the curve */ 345 { 346 EC_KEY_free(eckey); 347 eckey = NULL; 348 continue; 349 } 350 BIO_printf(out, "%s: ", OBJ_nid2sn(nid)); 351 /* create key */ 352 if (!EC_KEY_generate_key(eckey)) { 353 BIO_printf(out, " failed\n"); 354 goto builtin_err; 355 } 356 /* create second key */ 357 if ((wrong_eckey = EC_KEY_new()) == NULL) 358 goto builtin_err; 359 group = EC_GROUP_new_by_curve_name(nid); 360 if (group == NULL) 361 goto builtin_err; 362 if (EC_KEY_set_group(wrong_eckey, group) == 0) 363 goto builtin_err; 364 EC_GROUP_free(group); 365 if (!EC_KEY_generate_key(wrong_eckey)) { 366 BIO_printf(out, " failed\n"); 367 goto builtin_err; 368 } 369 370 BIO_printf(out, "."); 371 (void)BIO_flush(out); 372 /* check key */ 373 if (!EC_KEY_check_key(eckey)) { 374 BIO_printf(out, " failed\n"); 375 goto builtin_err; 376 } 377 BIO_printf(out, "."); 378 (void)BIO_flush(out); 379 /* create signature */ 380 sig_len = ECDSA_size(eckey); 381 if ((signature = OPENSSL_malloc(sig_len)) == NULL) 382 goto builtin_err; 383 if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey)) { 384 BIO_printf(out, " failed\n"); 385 goto builtin_err; 386 } 387 BIO_printf(out, "."); 388 (void)BIO_flush(out); 389 /* verify signature */ 390 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) { 391 BIO_printf(out, " failed\n"); 392 goto builtin_err; 393 } 394 BIO_printf(out, "."); 395 (void)BIO_flush(out); 396 /* verify signature with the wrong key */ 397 if (ECDSA_verify(0, digest, 20, signature, sig_len, wrong_eckey) == 1) { 398 BIO_printf(out, " failed\n"); 399 goto builtin_err; 400 } 401 BIO_printf(out, "."); 402 (void)BIO_flush(out); 403 /* wrong digest */ 404 if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len, eckey) == 1) { 405 BIO_printf(out, " failed\n"); 406 goto builtin_err; 407 } 408 BIO_printf(out, "."); 409 (void)BIO_flush(out); 410 /* wrong length */ 411 if (ECDSA_verify(0, digest, 20, signature, sig_len - 1, eckey) == 1) { 412 BIO_printf(out, " failed\n"); 413 goto builtin_err; 414 } 415 BIO_printf(out, "."); 416 (void)BIO_flush(out); 417 418 /* 419 * Modify a single byte of the signature: to ensure we don't garble 420 * the ASN1 structure, we read the raw signature and modify a byte in 421 * one of the bignums directly. 422 */ 423 sig_ptr = signature; 424 if ((ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)) == NULL) { 425 BIO_printf(out, " failed\n"); 426 goto builtin_err; 427 } 428 429 /* Store the two BIGNUMs in raw_buf. */ 430 r_len = BN_num_bytes(ecdsa_sig->r); 431 s_len = BN_num_bytes(ecdsa_sig->s); 432 bn_len = (degree + 7) / 8; 433 if ((r_len > bn_len) || (s_len > bn_len)) { 434 BIO_printf(out, " failed\n"); 435 goto builtin_err; 436 } 437 buf_len = 2 * bn_len; 438 if ((raw_buf = OPENSSL_malloc(buf_len)) == NULL) 439 goto builtin_err; 440 /* Pad the bignums with leading zeroes. */ 441 memset(raw_buf, 0, buf_len); 442 BN_bn2bin(ecdsa_sig->r, raw_buf + bn_len - r_len); 443 BN_bn2bin(ecdsa_sig->s, raw_buf + buf_len - s_len); 444 445 /* Modify a single byte in the buffer. */ 446 offset = raw_buf[10] % buf_len; 447 dirt = raw_buf[11] ? raw_buf[11] : 1; 448 raw_buf[offset] ^= dirt; 449 /* Now read the BIGNUMs back in from raw_buf. */ 450 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) || 451 (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL)) 452 goto builtin_err; 453 454 sig_ptr2 = signature; 455 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2); 456 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1) { 457 BIO_printf(out, " failed\n"); 458 goto builtin_err; 459 } 460 /* 461 * Sanity check: undo the modification and verify signature. 462 */ 463 raw_buf[offset] ^= dirt; 464 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) || 465 (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL)) 466 goto builtin_err; 467 468 sig_ptr2 = signature; 469 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2); 470 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) { 471 BIO_printf(out, " failed\n"); 472 goto builtin_err; 473 } 474 BIO_printf(out, "."); 475 (void)BIO_flush(out); 476 477 BIO_printf(out, " ok\n"); 478 /* cleanup */ 479 /* clean bogus errors */ 480 ERR_clear_error(); 481 OPENSSL_free(signature); 482 signature = NULL; 483 EC_KEY_free(eckey); 484 eckey = NULL; 485 EC_KEY_free(wrong_eckey); 486 wrong_eckey = NULL; 487 ECDSA_SIG_free(ecdsa_sig); 488 ecdsa_sig = NULL; 489 OPENSSL_free(raw_buf); 490 raw_buf = NULL; 491 } 492 493 ret = 1; 494 builtin_err: 495 if (eckey) 496 EC_KEY_free(eckey); 497 if (wrong_eckey) 498 EC_KEY_free(wrong_eckey); 499 if (ecdsa_sig) 500 ECDSA_SIG_free(ecdsa_sig); 501 if (signature) 502 OPENSSL_free(signature); 503 if (raw_buf) 504 OPENSSL_free(raw_buf); 505 if (curves) 506 OPENSSL_free(curves); 507 508 return ret; 509} 510 511int main(void) 512{ 513 int ret = 1; 514 BIO *out; 515 516 out = BIO_new_fp(stdout, BIO_NOCLOSE); 517 518 /* enable memory leak checking unless explicitly disabled */ 519 if (!((getenv("OPENSSL_DEBUG_MEMORY") != NULL) && 520 (0 == strcmp(getenv("OPENSSL_DEBUG_MEMORY"), "off")))) { 521 CRYPTO_malloc_debug_init(); 522 CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL); 523 } else { 524 /* OPENSSL_DEBUG_MEMORY=off */ 525 CRYPTO_set_mem_debug_functions(0, 0, 0, 0, 0); 526 } 527 CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON); 528 529 ERR_load_crypto_strings(); 530 531 /* initialize the prng */ 532 RAND_seed(rnd_seed, sizeof(rnd_seed)); 533 534 /* the tests */ 535 if (!x9_62_tests(out)) 536 goto err; 537 if (!test_builtin(out)) 538 goto err; 539 540 ret = 0; 541 err: 542 if (ret) 543 BIO_printf(out, "\nECDSA test failed\n"); 544 else 545 BIO_printf(out, "\nECDSA test passed\n"); 546 if (ret) 547 ERR_print_errors(out); 548 CRYPTO_cleanup_all_ex_data(); 549 ERR_remove_thread_state(NULL); 550 ERR_free_strings(); 551 CRYPTO_mem_leaks(out); 552 if (out != NULL) 553 BIO_free(out); 554 return ret; 555} 556#endif 557