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 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) || 300 !RAND_pseudo_bytes(wrong_digest, 20)) 301 { 302 BIO_printf(out, "ERROR: unable to get random data\n"); 303 goto builtin_err; 304 } 305 306 /* create and verify a ecdsa signature with every availble curve 307 * (with ) */ 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 { 318 BIO_printf(out, "malloc error\n"); 319 goto builtin_err; 320 } 321 322 if (!EC_get_builtin_curves(curves, crv_len)) 323 { 324 BIO_printf(out, "unable to get internal curves\n"); 325 goto builtin_err; 326 } 327 328 /* now create and verify a signature for every curve */ 329 for (n = 0; n < crv_len; n++) 330 { 331 unsigned char dirt, offset; 332 333 nid = curves[n].nid; 334 if (nid == NID_ipsec4) 335 continue; 336 /* create new ecdsa key (== EC_KEY) */ 337 if ((eckey = EC_KEY_new()) == NULL) 338 goto builtin_err; 339 group = EC_GROUP_new_by_curve_name(nid); 340 if (group == NULL) 341 goto builtin_err; 342 if (EC_KEY_set_group(eckey, group) == 0) 343 goto builtin_err; 344 EC_GROUP_free(group); 345 degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey)); 346 if (degree < 160) 347 /* drop the curve */ 348 { 349 EC_KEY_free(eckey); 350 eckey = NULL; 351 continue; 352 } 353 BIO_printf(out, "%s: ", OBJ_nid2sn(nid)); 354 /* create key */ 355 if (!EC_KEY_generate_key(eckey)) 356 { 357 BIO_printf(out, " failed\n"); 358 goto builtin_err; 359 } 360 /* create second key */ 361 if ((wrong_eckey = EC_KEY_new()) == NULL) 362 goto builtin_err; 363 group = EC_GROUP_new_by_curve_name(nid); 364 if (group == NULL) 365 goto builtin_err; 366 if (EC_KEY_set_group(wrong_eckey, group) == 0) 367 goto builtin_err; 368 EC_GROUP_free(group); 369 if (!EC_KEY_generate_key(wrong_eckey)) 370 { 371 BIO_printf(out, " failed\n"); 372 goto builtin_err; 373 } 374 375 BIO_printf(out, "."); 376 (void)BIO_flush(out); 377 /* check key */ 378 if (!EC_KEY_check_key(eckey)) 379 { 380 BIO_printf(out, " failed\n"); 381 goto builtin_err; 382 } 383 BIO_printf(out, "."); 384 (void)BIO_flush(out); 385 /* create signature */ 386 sig_len = ECDSA_size(eckey); 387 if ((signature = OPENSSL_malloc(sig_len)) == NULL) 388 goto builtin_err; 389 if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey)) 390 { 391 BIO_printf(out, " failed\n"); 392 goto builtin_err; 393 } 394 BIO_printf(out, "."); 395 (void)BIO_flush(out); 396 /* verify signature */ 397 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) 398 { 399 BIO_printf(out, " failed\n"); 400 goto builtin_err; 401 } 402 BIO_printf(out, "."); 403 (void)BIO_flush(out); 404 /* verify signature with the wrong key */ 405 if (ECDSA_verify(0, digest, 20, signature, sig_len, 406 wrong_eckey) == 1) 407 { 408 BIO_printf(out, " failed\n"); 409 goto builtin_err; 410 } 411 BIO_printf(out, "."); 412 (void)BIO_flush(out); 413 /* wrong digest */ 414 if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len, 415 eckey) == 1) 416 { 417 BIO_printf(out, " failed\n"); 418 goto builtin_err; 419 } 420 BIO_printf(out, "."); 421 (void)BIO_flush(out); 422 /* wrong length */ 423 if (ECDSA_verify(0, digest, 20, signature, sig_len - 1, 424 eckey) == 1) 425 { 426 BIO_printf(out, " failed\n"); 427 goto builtin_err; 428 } 429 BIO_printf(out, "."); 430 (void)BIO_flush(out); 431 432 /* Modify a single byte of the signature: to ensure we don't 433 * garble the ASN1 structure, we read the raw signature and 434 * modify a byte in one of the bignums directly. */ 435 sig_ptr = signature; 436 if ((ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)) == NULL) 437 { 438 BIO_printf(out, " failed\n"); 439 goto builtin_err; 440 } 441 442 /* Store the two BIGNUMs in raw_buf. */ 443 r_len = BN_num_bytes(ecdsa_sig->r); 444 s_len = BN_num_bytes(ecdsa_sig->s); 445 bn_len = (degree + 7) / 8; 446 if ((r_len > bn_len) || (s_len > bn_len)) 447 { 448 BIO_printf(out, " failed\n"); 449 goto builtin_err; 450 } 451 buf_len = 2 * bn_len; 452 if ((raw_buf = OPENSSL_malloc(buf_len)) == NULL) 453 goto builtin_err; 454 /* Pad the bignums with leading zeroes. */ 455 memset(raw_buf, 0, buf_len); 456 BN_bn2bin(ecdsa_sig->r, raw_buf + bn_len - r_len); 457 BN_bn2bin(ecdsa_sig->s, raw_buf + buf_len - s_len); 458 459 /* Modify a single byte in the buffer. */ 460 offset = raw_buf[10] % buf_len; 461 dirt = raw_buf[11] ? raw_buf[11] : 1; 462 raw_buf[offset] ^= dirt; 463 /* Now read the BIGNUMs back in from raw_buf. */ 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 { 472 BIO_printf(out, " failed\n"); 473 goto builtin_err; 474 } 475 /* Sanity check: undo the modification and verify signature. */ 476 raw_buf[offset] ^= dirt; 477 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) || 478 (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL)) 479 goto builtin_err; 480 481 sig_ptr2 = signature; 482 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2); 483 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) 484 { 485 BIO_printf(out, " failed\n"); 486 goto builtin_err; 487 } 488 BIO_printf(out, "."); 489 (void)BIO_flush(out); 490 491 BIO_printf(out, " ok\n"); 492 /* cleanup */ 493 /* clean bogus errors */ 494 ERR_clear_error(); 495 OPENSSL_free(signature); 496 signature = NULL; 497 EC_KEY_free(eckey); 498 eckey = NULL; 499 EC_KEY_free(wrong_eckey); 500 wrong_eckey = NULL; 501 ECDSA_SIG_free(ecdsa_sig); 502 ecdsa_sig = NULL; 503 OPENSSL_free(raw_buf); 504 raw_buf = NULL; 505 } 506 507 ret = 1; 508builtin_err: 509 if (eckey) 510 EC_KEY_free(eckey); 511 if (wrong_eckey) 512 EC_KEY_free(wrong_eckey); 513 if (ecdsa_sig) 514 ECDSA_SIG_free(ecdsa_sig); 515 if (signature) 516 OPENSSL_free(signature); 517 if (raw_buf) 518 OPENSSL_free(raw_buf); 519 if (curves) 520 OPENSSL_free(curves); 521 522 return ret; 523 } 524 525int main(void) 526 { 527 int ret = 1; 528 BIO *out; 529 530 out = BIO_new_fp(stdout, BIO_NOCLOSE); 531 532 /* enable memory leak checking unless explicitly disabled */ 533 if (!((getenv("OPENSSL_DEBUG_MEMORY") != NULL) && 534 (0 == strcmp(getenv("OPENSSL_DEBUG_MEMORY"), "off")))) 535 { 536 CRYPTO_malloc_debug_init(); 537 CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL); 538 } 539 else 540 { 541 /* OPENSSL_DEBUG_MEMORY=off */ 542 CRYPTO_set_mem_debug_functions(0, 0, 0, 0, 0); 543 } 544 CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON); 545 546 ERR_load_crypto_strings(); 547 548 /* initialize the prng */ 549 RAND_seed(rnd_seed, sizeof(rnd_seed)); 550 551 /* the tests */ 552 if (!x9_62_tests(out)) goto err; 553 if (!test_builtin(out)) goto err; 554 555 ret = 0; 556err: 557 if (ret) 558 BIO_printf(out, "\nECDSA test failed\n"); 559 else 560 BIO_printf(out, "\nECDSA test passed\n"); 561 if (ret) 562 ERR_print_errors(out); 563 CRYPTO_cleanup_all_ex_data(); 564 ERR_remove_state(0); 565 ERR_free_strings(); 566 CRYPTO_mem_leaks(out); 567 if (out != NULL) 568 BIO_free(out); 569 return ret; 570 } 571#endif 572