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 79 int 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 97 static const char rnd_seed[] = "string to make the random number generator " 98 "think it has entropy"; 99 100 /* declaration of the test functions */ 101 int x9_62_tests(BIO *); 102 int x9_62_test_internal(BIO *out, int nid, const char *r, const char *s); 103 int test_builtin(BIO *); 104 105 /* functions to change the RAND_METHOD */ 106 int change_rand(void); 107 int restore_rand(void); 108 int fbytes(unsigned char *buf, int num); 109 110 RAND_METHOD fake_rand; 111 const RAND_METHOD *old_rand; 112 113 int 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 } 131 132 int restore_rand(void) 133 { 134 if (!RAND_set_rand_method(old_rand)) 135 return 0; 136 else 137 return 1; 138 } 139 140 static int fbytes_counter = 0; 141 static 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 int 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 */ 181 int 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; 230 x962_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 } 244 245 int 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 #ifndef OPENSSL_NO_EC2M 266 if (!x9_62_test_internal(out, NID_X9_62_c2tnb191v1, 267 "87194383164871543355722284926904419997237591535066528048", 268 "308992691965804947361541664549085895292153777025772063598")) 269 goto x962_err; 270 if (!x9_62_test_internal(out, NID_X9_62_c2tnb239v1, 271 "2159633321041961198501834003903461262881815148684178964245" 272 "5876922391552", 273 "1970303740007316867383349976549972270528498040721988191026" 274 "49413465737174")) 275 goto x962_err; 276 #endif 277 ret = 1; 278 x962_err: 279 if (!restore_rand()) 280 ret = 0; 281 return ret; 282 } 283 284 int test_builtin(BIO *out) 285 { 286 EC_builtin_curve *curves = NULL; 287 size_t crv_len = 0, n = 0; 288 EC_KEY *eckey = NULL, *wrong_eckey = NULL; 289 EC_GROUP *group; 290 ECDSA_SIG *ecdsa_sig = NULL; 291 unsigned char digest[20], wrong_digest[20]; 292 unsigned char *signature = NULL; 293 const unsigned char *sig_ptr; 294 unsigned char *sig_ptr2; 295 unsigned char *raw_buf = NULL; 296 unsigned int sig_len, degree, r_len, s_len, bn_len, buf_len; 297 int nid, ret = 0; 298 299 /* fill digest values with some random data */ 300 if (!RAND_pseudo_bytes(digest, 20) || 301 !RAND_pseudo_bytes(wrong_digest, 20)) 302 { 303 BIO_printf(out, "ERROR: unable to get random data\n"); 304 goto builtin_err; 305 } 306 307 /* create and verify a ecdsa signature with every availble curve 308 * (with ) */ 309 BIO_printf(out, "\ntesting ECDSA_sign() and ECDSA_verify() " 310 "with some internal curves:\n"); 311 312 /* get a list of all internal curves */ 313 crv_len = EC_get_builtin_curves(NULL, 0); 314 315 curves = OPENSSL_malloc(sizeof(EC_builtin_curve) * crv_len); 316 317 if (curves == NULL) 318 { 319 BIO_printf(out, "malloc error\n"); 320 goto builtin_err; 321 } 322 323 if (!EC_get_builtin_curves(curves, crv_len)) 324 { 325 BIO_printf(out, "unable to get internal curves\n"); 326 goto builtin_err; 327 } 328 329 /* now create and verify a signature for every curve */ 330 for (n = 0; n < crv_len; n++) 331 { 332 unsigned char dirt, offset; 333 334 nid = curves[n].nid; 335 if (nid == NID_ipsec4) 336 continue; 337 /* create new ecdsa key (== EC_KEY) */ 338 if ((eckey = EC_KEY_new()) == NULL) 339 goto builtin_err; 340 group = EC_GROUP_new_by_curve_name(nid); 341 if (group == NULL) 342 goto builtin_err; 343 if (EC_KEY_set_group(eckey, group) == 0) 344 goto builtin_err; 345 EC_GROUP_free(group); 346 degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey)); 347 if (degree < 160) 348 /* drop the curve */ 349 { 350 EC_KEY_free(eckey); 351 eckey = NULL; 352 continue; 353 } 354 BIO_printf(out, "%s: ", OBJ_nid2sn(nid)); 355 /* create key */ 356 if (!EC_KEY_generate_key(eckey)) 357 { 358 BIO_printf(out, " failed\n"); 359 goto builtin_err; 360 } 361 /* create second key */ 362 if ((wrong_eckey = EC_KEY_new()) == NULL) 363 goto builtin_err; 364 group = EC_GROUP_new_by_curve_name(nid); 365 if (group == NULL) 366 goto builtin_err; 367 if (EC_KEY_set_group(wrong_eckey, group) == 0) 368 goto builtin_err; 369 EC_GROUP_free(group); 370 if (!EC_KEY_generate_key(wrong_eckey)) 371 { 372 BIO_printf(out, " failed\n"); 373 goto builtin_err; 374 } 375 376 BIO_printf(out, "."); 377 (void)BIO_flush(out); 378 /* check key */ 379 if (!EC_KEY_check_key(eckey)) 380 { 381 BIO_printf(out, " failed\n"); 382 goto builtin_err; 383 } 384 BIO_printf(out, "."); 385 (void)BIO_flush(out); 386 /* create signature */ 387 sig_len = ECDSA_size(eckey); 388 if ((signature = OPENSSL_malloc(sig_len)) == NULL) 389 goto builtin_err; 390 if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey)) 391 { 392 BIO_printf(out, " failed\n"); 393 goto builtin_err; 394 } 395 BIO_printf(out, "."); 396 (void)BIO_flush(out); 397 /* verify signature */ 398 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) 399 { 400 BIO_printf(out, " failed\n"); 401 goto builtin_err; 402 } 403 BIO_printf(out, "."); 404 (void)BIO_flush(out); 405 /* verify signature with the wrong key */ 406 if (ECDSA_verify(0, digest, 20, signature, sig_len, 407 wrong_eckey) == 1) 408 { 409 BIO_printf(out, " failed\n"); 410 goto builtin_err; 411 } 412 BIO_printf(out, "."); 413 (void)BIO_flush(out); 414 /* wrong digest */ 415 if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len, 416 eckey) == 1) 417 { 418 BIO_printf(out, " failed\n"); 419 goto builtin_err; 420 } 421 BIO_printf(out, "."); 422 (void)BIO_flush(out); 423 /* wrong length */ 424 if (ECDSA_verify(0, digest, 20, signature, sig_len - 1, 425 eckey) == 1) 426 { 427 BIO_printf(out, " failed\n"); 428 goto builtin_err; 429 } 430 BIO_printf(out, "."); 431 (void)BIO_flush(out); 432 433 /* Modify a single byte of the signature: to ensure we don't 434 * garble the ASN1 structure, we read the raw signature and 435 * modify a byte in one of the bignums directly. */ 436 sig_ptr = signature; 437 if ((ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)) == NULL) 438 { 439 BIO_printf(out, " failed\n"); 440 goto builtin_err; 441 } 442 443 /* Store the two BIGNUMs in raw_buf. */ 444 r_len = BN_num_bytes(ecdsa_sig->r); 445 s_len = BN_num_bytes(ecdsa_sig->s); 446 bn_len = (degree + 7) / 8; 447 if ((r_len > bn_len) || (s_len > bn_len)) 448 { 449 BIO_printf(out, " failed\n"); 450 goto builtin_err; 451 } 452 buf_len = 2 * bn_len; 453 if ((raw_buf = OPENSSL_malloc(buf_len)) == NULL) 454 goto builtin_err; 455 /* Pad the bignums with leading zeroes. */ 456 memset(raw_buf, 0, buf_len); 457 BN_bn2bin(ecdsa_sig->r, raw_buf + bn_len - r_len); 458 BN_bn2bin(ecdsa_sig->s, raw_buf + buf_len - s_len); 459 460 /* Modify a single byte in the buffer. */ 461 offset = raw_buf[10] % buf_len; 462 dirt = raw_buf[11] ? raw_buf[11] : 1; 463 raw_buf[offset] ^= dirt; 464 /* Now read the BIGNUMs back in from raw_buf. */ 465 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) || 466 (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL)) 467 goto builtin_err; 468 469 sig_ptr2 = signature; 470 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2); 471 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1) 472 { 473 BIO_printf(out, " failed\n"); 474 goto builtin_err; 475 } 476 /* Sanity check: undo the modification and verify signature. */ 477 raw_buf[offset] ^= dirt; 478 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) || 479 (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL)) 480 goto builtin_err; 481 482 sig_ptr2 = signature; 483 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2); 484 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) 485 { 486 BIO_printf(out, " failed\n"); 487 goto builtin_err; 488 } 489 BIO_printf(out, "."); 490 (void)BIO_flush(out); 491 492 BIO_printf(out, " ok\n"); 493 /* cleanup */ 494 /* clean bogus errors */ 495 ERR_clear_error(); 496 OPENSSL_free(signature); 497 signature = NULL; 498 EC_KEY_free(eckey); 499 eckey = NULL; 500 EC_KEY_free(wrong_eckey); 501 wrong_eckey = NULL; 502 ECDSA_SIG_free(ecdsa_sig); 503 ecdsa_sig = NULL; 504 OPENSSL_free(raw_buf); 505 raw_buf = NULL; 506 } 507 508 ret = 1; 509 builtin_err: 510 if (eckey) 511 EC_KEY_free(eckey); 512 if (wrong_eckey) 513 EC_KEY_free(wrong_eckey); 514 if (ecdsa_sig) 515 ECDSA_SIG_free(ecdsa_sig); 516 if (signature) 517 OPENSSL_free(signature); 518 if (raw_buf) 519 OPENSSL_free(raw_buf); 520 if (curves) 521 OPENSSL_free(curves); 522 523 return ret; 524 } 525 526 int main(void) 527 { 528 int ret = 1; 529 BIO *out; 530 531 out = BIO_new_fp(stdout, BIO_NOCLOSE); 532 533 /* enable memory leak checking unless explicitly disabled */ 534 if (!((getenv("OPENSSL_DEBUG_MEMORY") != NULL) && 535 (0 == strcmp(getenv("OPENSSL_DEBUG_MEMORY"), "off")))) 536 { 537 CRYPTO_malloc_debug_init(); 538 CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL); 539 } 540 else 541 { 542 /* OPENSSL_DEBUG_MEMORY=off */ 543 CRYPTO_set_mem_debug_functions(0, 0, 0, 0, 0); 544 } 545 CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON); 546 547 ERR_load_crypto_strings(); 548 549 /* initialize the prng */ 550 RAND_seed(rnd_seed, sizeof(rnd_seed)); 551 552 /* the tests */ 553 if (!x9_62_tests(out)) goto err; 554 if (!test_builtin(out)) goto err; 555 556 ret = 0; 557 err: 558 if (ret) 559 BIO_printf(out, "\nECDSA test failed\n"); 560 else 561 BIO_printf(out, "\nECDSA test passed\n"); 562 if (ret) 563 ERR_print_errors(out); 564 CRYPTO_cleanup_all_ex_data(); 565 ERR_remove_thread_state(NULL); 566 ERR_free_strings(); 567 CRYPTO_mem_leaks(out); 568 if (out != NULL) 569 BIO_free(out); 570 return ret; 571 } 572 #endif 573