ecdsatest.c revision 7b476c43f6a45574eb34697244b592e7b09f05a3
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 155int fbytes(unsigned char *buf, int num) 156 { 157 int ret; 158 BIGNUM *tmp = NULL; 159 160 if (fbytes_counter >= 8) 161 return 0; 162 tmp = BN_new(); 163 if (!tmp) 164 return 0; 165 if (!BN_dec2bn(&tmp, numbers[fbytes_counter])) 166 { 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) || 216 !BN_dec2bn(&s, s_in)) 217 goto x962_int_err; 218 if (BN_cmp(signature->r ,r) || BN_cmp(signature->s, s)) 219 goto x962_int_err; 220 BIO_printf(out, "."); 221 (void)BIO_flush(out); 222 /* verify the signature */ 223 if (ECDSA_do_verify(digest, 20, signature, key) != 1) 224 goto x962_int_err; 225 BIO_printf(out, "."); 226 (void)BIO_flush(out); 227 228 BIO_printf(out, " ok\n"); 229 ret = 1; 230x962_int_err: 231 if (!ret) 232 BIO_printf(out, " failed\n"); 233 if (key) 234 EC_KEY_free(key); 235 if (signature) 236 ECDSA_SIG_free(signature); 237 if (r) 238 BN_free(r); 239 if (s) 240 BN_free(s); 241 EVP_MD_CTX_cleanup(&md_ctx); 242 return ret; 243 } 244 245int x9_62_tests(BIO *out) 246 { 247 int ret = 0; 248 249 BIO_printf(out, "some tests from X9.62:\n"); 250 251 /* set own rand method */ 252 if (!change_rand()) 253 goto x962_err; 254 255 if (!x9_62_test_internal(out, NID_X9_62_prime192v1, 256 "3342403536405981729393488334694600415596881826869351677613", 257 "5735822328888155254683894997897571951568553642892029982342")) 258 goto x962_err; 259 if (!x9_62_test_internal(out, NID_X9_62_prime239v1, 260 "3086361431751678114926225473006680188549593787585317781474" 261 "62058306432176", 262 "3238135532097973577080787768312505059318910517550078427819" 263 "78505179448783")) 264 goto x962_err; 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; 275 276 ret = 1; 277x962_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 unsigned char *sig_ptr; 293 unsigned char *raw_buf = NULL; 294 unsigned int sig_len, degree, r_len, s_len, bn_len, buf_len; 295 int nid, ret = 0; 296 297 /* fill digest values with some random data */ 298 if (!RAND_pseudo_bytes(digest, 20) || 299 !RAND_pseudo_bytes(wrong_digest, 20)) 300 { 301 BIO_printf(out, "ERROR: unable to get random data\n"); 302 goto builtin_err; 303 } 304 305 /* create and verify a ecdsa signature with every availble curve 306 * (with ) */ 307 BIO_printf(out, "\ntesting ECDSA_sign() and ECDSA_verify() " 308 "with some internal curves:\n"); 309 310 /* get a list of all internal curves */ 311 crv_len = EC_get_builtin_curves(NULL, 0); 312 313 curves = OPENSSL_malloc(sizeof(EC_builtin_curve) * crv_len); 314 315 if (curves == NULL) 316 { 317 BIO_printf(out, "malloc error\n"); 318 goto builtin_err; 319 } 320 321 if (!EC_get_builtin_curves(curves, crv_len)) 322 { 323 BIO_printf(out, "unable to get internal curves\n"); 324 goto builtin_err; 325 } 326 327 /* now create and verify a signature for every curve */ 328 for (n = 0; n < crv_len; n++) 329 { 330 unsigned char dirt, offset; 331 332 nid = curves[n].nid; 333 if (nid == NID_ipsec4) 334 continue; 335 /* create new ecdsa key (== EC_KEY) */ 336 if ((eckey = EC_KEY_new()) == NULL) 337 goto builtin_err; 338 group = EC_GROUP_new_by_curve_name(nid); 339 if (group == NULL) 340 goto builtin_err; 341 if (EC_KEY_set_group(eckey, group) == 0) 342 goto builtin_err; 343 EC_GROUP_free(group); 344 degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey)); 345 if (degree < 160) 346 /* drop the curve */ 347 { 348 EC_KEY_free(eckey); 349 eckey = NULL; 350 continue; 351 } 352 BIO_printf(out, "%s: ", OBJ_nid2sn(nid)); 353 /* create key */ 354 if (!EC_KEY_generate_key(eckey)) 355 { 356 BIO_printf(out, " failed\n"); 357 goto builtin_err; 358 } 359 /* create second key */ 360 if ((wrong_eckey = EC_KEY_new()) == NULL) 361 goto builtin_err; 362 group = EC_GROUP_new_by_curve_name(nid); 363 if (group == NULL) 364 goto builtin_err; 365 if (EC_KEY_set_group(wrong_eckey, group) == 0) 366 goto builtin_err; 367 EC_GROUP_free(group); 368 if (!EC_KEY_generate_key(wrong_eckey)) 369 { 370 BIO_printf(out, " failed\n"); 371 goto builtin_err; 372 } 373 374 BIO_printf(out, "."); 375 (void)BIO_flush(out); 376 /* check key */ 377 if (!EC_KEY_check_key(eckey)) 378 { 379 BIO_printf(out, " failed\n"); 380 goto builtin_err; 381 } 382 BIO_printf(out, "."); 383 (void)BIO_flush(out); 384 /* create signature */ 385 sig_len = ECDSA_size(eckey); 386 if ((signature = OPENSSL_malloc(sig_len)) == NULL) 387 goto builtin_err; 388 if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey)) 389 { 390 BIO_printf(out, " failed\n"); 391 goto builtin_err; 392 } 393 BIO_printf(out, "."); 394 (void)BIO_flush(out); 395 /* verify signature */ 396 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) 397 { 398 BIO_printf(out, " failed\n"); 399 goto builtin_err; 400 } 401 BIO_printf(out, "."); 402 (void)BIO_flush(out); 403 /* verify signature with the wrong key */ 404 if (ECDSA_verify(0, digest, 20, signature, sig_len, 405 wrong_eckey) == 1) 406 { 407 BIO_printf(out, " failed\n"); 408 goto builtin_err; 409 } 410 BIO_printf(out, "."); 411 (void)BIO_flush(out); 412 /* wrong digest */ 413 if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len, 414 eckey) == 1) 415 { 416 BIO_printf(out, " failed\n"); 417 goto builtin_err; 418 } 419 BIO_printf(out, "."); 420 (void)BIO_flush(out); 421 /* wrong length */ 422 if (ECDSA_verify(0, digest, 20, signature, sig_len - 1, 423 eckey) == 1) 424 { 425 BIO_printf(out, " failed\n"); 426 goto builtin_err; 427 } 428 BIO_printf(out, "."); 429 (void)BIO_flush(out); 430 431 /* Modify a single byte of the signature: to ensure we don't 432 * garble the ASN1 structure, we read the raw signature and 433 * modify a byte in one of the bignums directly. */ 434 sig_ptr = signature; 435 if ((ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)) == NULL) 436 { 437 BIO_printf(out, " failed\n"); 438 goto builtin_err; 439 } 440 441 /* Store the two BIGNUMs in raw_buf. */ 442 r_len = BN_num_bytes(ecdsa_sig->r); 443 s_len = BN_num_bytes(ecdsa_sig->s); 444 bn_len = (degree + 7) / 8; 445 if ((r_len > bn_len) || (s_len > bn_len)) 446 { 447 BIO_printf(out, " failed\n"); 448 goto builtin_err; 449 } 450 buf_len = 2 * bn_len; 451 if ((raw_buf = OPENSSL_malloc(buf_len)) == NULL) 452 goto builtin_err; 453 /* Pad the bignums with leading zeroes. */ 454 memset(raw_buf, 0, buf_len); 455 BN_bn2bin(ecdsa_sig->r, raw_buf + bn_len - r_len); 456 BN_bn2bin(ecdsa_sig->s, raw_buf + buf_len - s_len); 457 458 /* Modify a single byte in the buffer. */ 459 offset = raw_buf[10] % buf_len; 460 dirt = raw_buf[11] ? raw_buf[11] : 1; 461 raw_buf[offset] ^= dirt; 462 /* Now read the BIGNUMs back in from raw_buf. */ 463 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) || 464 (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL)) 465 goto builtin_err; 466 467 sig_ptr = signature; 468 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr); 469 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1) 470 { 471 BIO_printf(out, " failed\n"); 472 goto builtin_err; 473 } 474 /* Sanity check: undo the modification and verify signature. */ 475 raw_buf[offset] ^= dirt; 476 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) || 477 (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL)) 478 goto builtin_err; 479 480 sig_ptr = signature; 481 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr); 482 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) 483 { 484 BIO_printf(out, " failed\n"); 485 goto builtin_err; 486 } 487 BIO_printf(out, "."); 488 (void)BIO_flush(out); 489 490 BIO_printf(out, " ok\n"); 491 /* cleanup */ 492 /* clean bogus errors */ 493 ERR_clear_error(); 494 OPENSSL_free(signature); 495 signature = NULL; 496 EC_KEY_free(eckey); 497 eckey = NULL; 498 EC_KEY_free(wrong_eckey); 499 wrong_eckey = NULL; 500 ECDSA_SIG_free(ecdsa_sig); 501 ecdsa_sig = NULL; 502 OPENSSL_free(raw_buf); 503 raw_buf = NULL; 504 } 505 506 ret = 1; 507builtin_err: 508 if (eckey) 509 EC_KEY_free(eckey); 510 if (wrong_eckey) 511 EC_KEY_free(wrong_eckey); 512 if (ecdsa_sig) 513 ECDSA_SIG_free(ecdsa_sig); 514 if (signature) 515 OPENSSL_free(signature); 516 if (raw_buf) 517 OPENSSL_free(raw_buf); 518 if (curves) 519 OPENSSL_free(curves); 520 521 return ret; 522 } 523 524int main(void) 525 { 526 int ret = 1; 527 BIO *out; 528 529 out = BIO_new_fp(stdout, BIO_NOCLOSE); 530 531 /* enable memory leak checking unless explicitly disabled */ 532 if (!((getenv("OPENSSL_DEBUG_MEMORY") != NULL) && 533 (0 == strcmp(getenv("OPENSSL_DEBUG_MEMORY"), "off")))) 534 { 535 CRYPTO_malloc_debug_init(); 536 CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL); 537 } 538 else 539 { 540 /* OPENSSL_DEBUG_MEMORY=off */ 541 CRYPTO_set_mem_debug_functions(0, 0, 0, 0, 0); 542 } 543 CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON); 544 545 ERR_load_crypto_strings(); 546 547 /* initialize the prng */ 548 RAND_seed(rnd_seed, sizeof(rnd_seed)); 549 550 /* the tests */ 551 if (!x9_62_tests(out)) goto err; 552 if (!test_builtin(out)) goto err; 553 554 ret = 0; 555err: 556 if (ret) 557 BIO_printf(out, "\nECDSA test failed\n"); 558 else 559 BIO_printf(out, "\nECDSA test passed\n"); 560 if (ret) 561 ERR_print_errors(out); 562 CRYPTO_cleanup_all_ex_data(); 563 ERR_remove_thread_state(NULL); 564 ERR_free_strings(); 565 CRYPTO_mem_leaks(out); 566 if (out != NULL) 567 BIO_free(out); 568 return ret; 569 } 570#endif 571