1/* crypto/ecdsa/ecdsatest.c */ 2/* 3 * Written by Nils Larsch for the OpenSSL project. 4 */ 5/* ==================================================================== 6 * Copyright (c) 2000-2018 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, use_fake = 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 (use_fake == 0) 162 return old_rand->bytes(buf, num); 163 164 use_fake = 0; 165 166 if (fbytes_counter >= 8) 167 return 0; 168 tmp = BN_new(); 169 if (!tmp) 170 return 0; 171 if (!BN_dec2bn(&tmp, numbers[fbytes_counter])) { 172 BN_free(tmp); 173 return 0; 174 } 175 fbytes_counter++; 176 if (num != BN_num_bytes(tmp) || !BN_bn2bin(tmp, buf)) 177 ret = 0; 178 else 179 ret = 1; 180 if (tmp) 181 BN_free(tmp); 182 return ret; 183} 184 185/* some tests from the X9.62 draft */ 186int x9_62_test_internal(BIO *out, int nid, const char *r_in, const char *s_in) 187{ 188 int ret = 0; 189 const char message[] = "abc"; 190 unsigned char digest[20]; 191 unsigned int dgst_len = 0; 192 EVP_MD_CTX md_ctx; 193 EC_KEY *key = NULL; 194 ECDSA_SIG *signature = NULL; 195 BIGNUM *r = NULL, *s = NULL; 196 197 EVP_MD_CTX_init(&md_ctx); 198 /* get the message digest */ 199 EVP_DigestInit(&md_ctx, EVP_ecdsa()); 200 EVP_DigestUpdate(&md_ctx, (const void *)message, 3); 201 EVP_DigestFinal(&md_ctx, digest, &dgst_len); 202 203 BIO_printf(out, "testing %s: ", OBJ_nid2sn(nid)); 204 /* create the key */ 205 if ((key = EC_KEY_new_by_curve_name(nid)) == NULL) 206 goto x962_int_err; 207 use_fake = 1; 208 if (!EC_KEY_generate_key(key)) 209 goto x962_int_err; 210 BIO_printf(out, "."); 211 (void)BIO_flush(out); 212 /* create the signature */ 213 use_fake = 1; 214 signature = ECDSA_do_sign(digest, 20, key); 215 if (signature == NULL) 216 goto x962_int_err; 217 BIO_printf(out, "."); 218 (void)BIO_flush(out); 219 /* compare the created signature with the expected signature */ 220 if ((r = BN_new()) == NULL || (s = BN_new()) == NULL) 221 goto x962_int_err; 222 if (!BN_dec2bn(&r, r_in) || !BN_dec2bn(&s, s_in)) 223 goto x962_int_err; 224 if (BN_cmp(signature->r, r) || BN_cmp(signature->s, s)) 225 goto x962_int_err; 226 BIO_printf(out, "."); 227 (void)BIO_flush(out); 228 /* verify the signature */ 229 if (ECDSA_do_verify(digest, 20, signature, key) != 1) 230 goto x962_int_err; 231 BIO_printf(out, "."); 232 (void)BIO_flush(out); 233 234 BIO_printf(out, " ok\n"); 235 ret = 1; 236 x962_int_err: 237 if (!ret) 238 BIO_printf(out, " failed\n"); 239 if (key) 240 EC_KEY_free(key); 241 if (signature) 242 ECDSA_SIG_free(signature); 243 if (r) 244 BN_free(r); 245 if (s) 246 BN_free(s); 247 EVP_MD_CTX_cleanup(&md_ctx); 248 return ret; 249} 250 251int x9_62_tests(BIO *out) 252{ 253 int ret = 0; 254 255 BIO_printf(out, "some tests from X9.62:\n"); 256 257 /* set own rand method */ 258 if (!change_rand()) 259 goto x962_err; 260 261 if (!x9_62_test_internal(out, NID_X9_62_prime192v1, 262 "3342403536405981729393488334694600415596881826869351677613", 263 "5735822328888155254683894997897571951568553642892029982342")) 264 goto x962_err; 265 if (!x9_62_test_internal(out, NID_X9_62_prime239v1, 266 "3086361431751678114926225473006680188549593787585317781474" 267 "62058306432176", 268 "3238135532097973577080787768312505059318910517550078427819" 269 "78505179448783")) 270 goto x962_err; 271# ifndef OPENSSL_NO_EC2M 272 if (!x9_62_test_internal(out, NID_X9_62_c2tnb191v1, 273 "87194383164871543355722284926904419997237591535066528048", 274 "308992691965804947361541664549085895292153777025772063598")) 275 goto x962_err; 276 if (!x9_62_test_internal(out, NID_X9_62_c2tnb239v1, 277 "2159633321041961198501834003903461262881815148684178964245" 278 "5876922391552", 279 "1970303740007316867383349976549972270528498040721988191026" 280 "49413465737174")) 281 goto x962_err; 282# endif 283 ret = 1; 284 x962_err: 285 if (!restore_rand()) 286 ret = 0; 287 return ret; 288} 289 290int test_builtin(BIO *out) 291{ 292 EC_builtin_curve *curves = NULL; 293 size_t crv_len = 0, n = 0; 294 EC_KEY *eckey = NULL, *wrong_eckey = NULL; 295 EC_GROUP *group; 296 ECDSA_SIG *ecdsa_sig = NULL; 297 unsigned char digest[20], wrong_digest[20]; 298 unsigned char *signature = NULL; 299 const unsigned char *sig_ptr; 300 unsigned char *sig_ptr2; 301 unsigned char *raw_buf = NULL; 302 unsigned int sig_len, degree, r_len, s_len, bn_len, buf_len; 303 int nid, ret = 0; 304 305 /* fill digest values with some random data */ 306 if (RAND_pseudo_bytes(digest, 20) <= 0 || 307 RAND_pseudo_bytes(wrong_digest, 20) <= 0) { 308 BIO_printf(out, "ERROR: unable to get random data\n"); 309 goto builtin_err; 310 } 311 312 /* 313 * create and verify a ecdsa signature with every availble curve (with ) 314 */ 315 BIO_printf(out, "\ntesting ECDSA_sign() and ECDSA_verify() " 316 "with some internal curves:\n"); 317 318 /* get a list of all internal curves */ 319 crv_len = EC_get_builtin_curves(NULL, 0); 320 321 curves = OPENSSL_malloc(sizeof(EC_builtin_curve) * crv_len); 322 323 if (curves == NULL) { 324 BIO_printf(out, "malloc error\n"); 325 goto builtin_err; 326 } 327 328 if (!EC_get_builtin_curves(curves, crv_len)) { 329 BIO_printf(out, "unable to get internal curves\n"); 330 goto builtin_err; 331 } 332 333 /* now create and verify a signature for every curve */ 334 for (n = 0; n < crv_len; n++) { 335 unsigned char dirt, offset; 336 337 nid = curves[n].nid; 338 if (nid == NID_ipsec4) 339 continue; 340 /* create new ecdsa key (== EC_KEY) */ 341 if ((eckey = EC_KEY_new()) == NULL) 342 goto builtin_err; 343 group = EC_GROUP_new_by_curve_name(nid); 344 if (group == NULL) 345 goto builtin_err; 346 if (EC_KEY_set_group(eckey, group) == 0) 347 goto builtin_err; 348 EC_GROUP_free(group); 349 degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey)); 350 if (degree < 160) 351 /* drop the curve */ 352 { 353 EC_KEY_free(eckey); 354 eckey = NULL; 355 continue; 356 } 357 BIO_printf(out, "%s: ", OBJ_nid2sn(nid)); 358 /* create key */ 359 if (!EC_KEY_generate_key(eckey)) { 360 BIO_printf(out, " failed\n"); 361 goto builtin_err; 362 } 363 /* create second key */ 364 if ((wrong_eckey = EC_KEY_new()) == NULL) 365 goto builtin_err; 366 group = EC_GROUP_new_by_curve_name(nid); 367 if (group == NULL) 368 goto builtin_err; 369 if (EC_KEY_set_group(wrong_eckey, group) == 0) 370 goto builtin_err; 371 EC_GROUP_free(group); 372 if (!EC_KEY_generate_key(wrong_eckey)) { 373 BIO_printf(out, " failed\n"); 374 goto builtin_err; 375 } 376 377 BIO_printf(out, "."); 378 (void)BIO_flush(out); 379 /* check key */ 380 if (!EC_KEY_check_key(eckey)) { 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 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 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, wrong_eckey) == 1) { 405 BIO_printf(out, " failed\n"); 406 goto builtin_err; 407 } 408 BIO_printf(out, "."); 409 (void)BIO_flush(out); 410 /* wrong digest */ 411 if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len, eckey) == 1) { 412 BIO_printf(out, " failed\n"); 413 goto builtin_err; 414 } 415 BIO_printf(out, "."); 416 (void)BIO_flush(out); 417 /* wrong length */ 418 if (ECDSA_verify(0, digest, 20, signature, sig_len - 1, eckey) == 1) { 419 BIO_printf(out, " failed\n"); 420 goto builtin_err; 421 } 422 BIO_printf(out, "."); 423 (void)BIO_flush(out); 424 425 /* 426 * Modify a single byte of the signature: to ensure we don't garble 427 * the ASN1 structure, we read the raw signature and modify a byte in 428 * one of the bignums directly. 429 */ 430 sig_ptr = signature; 431 if ((ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)) == NULL) { 432 BIO_printf(out, " failed\n"); 433 goto builtin_err; 434 } 435 436 /* Store the two BIGNUMs in raw_buf. */ 437 r_len = BN_num_bytes(ecdsa_sig->r); 438 s_len = BN_num_bytes(ecdsa_sig->s); 439 bn_len = (degree + 7) / 8; 440 if ((r_len > bn_len) || (s_len > bn_len)) { 441 BIO_printf(out, " failed\n"); 442 goto builtin_err; 443 } 444 buf_len = 2 * bn_len; 445 if ((raw_buf = OPENSSL_malloc(buf_len)) == NULL) 446 goto builtin_err; 447 /* Pad the bignums with leading zeroes. */ 448 memset(raw_buf, 0, buf_len); 449 BN_bn2bin(ecdsa_sig->r, raw_buf + bn_len - r_len); 450 BN_bn2bin(ecdsa_sig->s, raw_buf + buf_len - s_len); 451 452 /* Modify a single byte in the buffer. */ 453 offset = raw_buf[10] % buf_len; 454 dirt = raw_buf[11] ? raw_buf[11] : 1; 455 raw_buf[offset] ^= dirt; 456 /* Now read the BIGNUMs back in from raw_buf. */ 457 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) || 458 (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL)) 459 goto builtin_err; 460 461 sig_ptr2 = signature; 462 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2); 463 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1) { 464 BIO_printf(out, " failed\n"); 465 goto builtin_err; 466 } 467 /* 468 * Sanity check: undo the modification and verify signature. 469 */ 470 raw_buf[offset] ^= dirt; 471 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) || 472 (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL)) 473 goto builtin_err; 474 475 sig_ptr2 = signature; 476 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2); 477 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) { 478 BIO_printf(out, " failed\n"); 479 goto builtin_err; 480 } 481 BIO_printf(out, "."); 482 (void)BIO_flush(out); 483 484 BIO_printf(out, " ok\n"); 485 /* cleanup */ 486 /* clean bogus errors */ 487 ERR_clear_error(); 488 OPENSSL_free(signature); 489 signature = NULL; 490 EC_KEY_free(eckey); 491 eckey = NULL; 492 EC_KEY_free(wrong_eckey); 493 wrong_eckey = NULL; 494 ECDSA_SIG_free(ecdsa_sig); 495 ecdsa_sig = NULL; 496 OPENSSL_free(raw_buf); 497 raw_buf = NULL; 498 } 499 500 ret = 1; 501 builtin_err: 502 if (eckey) 503 EC_KEY_free(eckey); 504 if (wrong_eckey) 505 EC_KEY_free(wrong_eckey); 506 if (ecdsa_sig) 507 ECDSA_SIG_free(ecdsa_sig); 508 if (signature) 509 OPENSSL_free(signature); 510 if (raw_buf) 511 OPENSSL_free(raw_buf); 512 if (curves) 513 OPENSSL_free(curves); 514 515 return ret; 516} 517 518int main(void) 519{ 520 int ret = 1; 521 BIO *out; 522 523 out = BIO_new_fp(stdout, BIO_NOCLOSE); 524 525 /* enable memory leak checking unless explicitly disabled */ 526 if (!((getenv("OPENSSL_DEBUG_MEMORY") != NULL) && 527 (0 == strcmp(getenv("OPENSSL_DEBUG_MEMORY"), "off")))) { 528 CRYPTO_malloc_debug_init(); 529 CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL); 530 } else { 531 /* OPENSSL_DEBUG_MEMORY=off */ 532 CRYPTO_set_mem_debug_functions(0, 0, 0, 0, 0); 533 } 534 CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON); 535 536 ERR_load_crypto_strings(); 537 538 /* initialize the prng */ 539 RAND_seed(rnd_seed, sizeof(rnd_seed)); 540 541 /* the tests */ 542 if (!x9_62_tests(out)) 543 goto err; 544 if (!test_builtin(out)) 545 goto err; 546 547 ret = 0; 548 err: 549 if (ret) 550 BIO_printf(out, "\nECDSA test failed\n"); 551 else 552 BIO_printf(out, "\nECDSA test passed\n"); 553 if (ret) 554 ERR_print_errors(out); 555 CRYPTO_cleanup_all_ex_data(); 556 ERR_remove_thread_state(NULL); 557 ERR_free_strings(); 558 CRYPTO_mem_leaks(out); 559 if (out != NULL) 560 BIO_free(out); 561 return ret; 562} 563#endif 564