1 /* 2 * Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 /* ==================================================================== 11 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 12 * 13 * Portions of the attached software ("Contribution") are developed by 14 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. 15 * 16 * The Contribution is licensed pursuant to the OpenSSL open source 17 * license provided above. 18 * 19 * The elliptic curve binary polynomial software is originally written by 20 * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems Laboratories. 21 * 22 */ 23 24 #include <stdio.h> 25 #include <stdlib.h> 26 #include <string.h> 27 28 #include <openssl/opensslconf.h> /* To see if OPENSSL_NO_EC is defined */ 29 30 #ifdef OPENSSL_NO_EC 31 int main(int argc, char *argv[]) 32 { 33 puts("Elliptic curves are disabled."); 34 return 0; 35 } 36 #else 37 38 # include <openssl/crypto.h> 39 # include <openssl/bio.h> 40 # include <openssl/evp.h> 41 # include <openssl/bn.h> 42 # include <openssl/ec.h> 43 # ifndef OPENSSL_NO_ENGINE 44 # include <openssl/engine.h> 45 # endif 46 # include <openssl/err.h> 47 # include <openssl/rand.h> 48 49 static const char rnd_seed[] = "string to make the random number generator " 50 "think it has entropy"; 51 52 /* declaration of the test functions */ 53 int x9_62_tests(BIO *); 54 int x9_62_test_internal(BIO *out, int nid, const char *r, const char *s); 55 int test_builtin(BIO *); 56 57 /* functions to change the RAND_METHOD */ 58 int change_rand(void); 59 int restore_rand(void); 60 int fbytes(unsigned char *buf, int num); 61 62 static RAND_METHOD fake_rand; 63 static const RAND_METHOD *old_rand; 64 65 int change_rand(void) 66 { 67 /* save old rand method */ 68 if ((old_rand = RAND_get_rand_method()) == NULL) 69 return 0; 70 71 fake_rand.seed = old_rand->seed; 72 fake_rand.cleanup = old_rand->cleanup; 73 fake_rand.add = old_rand->add; 74 fake_rand.status = old_rand->status; 75 /* use own random function */ 76 fake_rand.bytes = fbytes; 77 fake_rand.pseudorand = old_rand->bytes; 78 /* set new RAND_METHOD */ 79 if (!RAND_set_rand_method(&fake_rand)) 80 return 0; 81 return 1; 82 } 83 84 int restore_rand(void) 85 { 86 if (!RAND_set_rand_method(old_rand)) 87 return 0; 88 else 89 return 1; 90 } 91 92 static int fbytes_counter = 0, use_fake = 0; 93 static const char *numbers[8] = { 94 "651056770906015076056810763456358567190100156695615665659", 95 "6140507067065001063065065565667405560006161556565665656654", 96 "8763001015071075675010661307616710783570106710677817767166" 97 "71676178726717", 98 "7000000175690566466555057817571571075705015757757057795755" 99 "55657156756655", 100 "1275552191113212300012030439187146164646146646466749494799", 101 "1542725565216523985789236956265265265235675811949404040041", 102 "1456427555219115346513212300075341203043918714616464614664" 103 "64667494947990", 104 "1712787255652165239672857892369562652652652356758119494040" 105 "40041670216363" 106 }; 107 108 int fbytes(unsigned char *buf, int num) 109 { 110 int ret; 111 BIGNUM *tmp = NULL; 112 113 if (use_fake == 0) 114 return old_rand->bytes(buf, num); 115 116 use_fake = 0; 117 118 if (fbytes_counter >= 8) 119 return 0; 120 tmp = BN_new(); 121 if (!tmp) 122 return 0; 123 if (!BN_dec2bn(&tmp, numbers[fbytes_counter])) { 124 BN_free(tmp); 125 return 0; 126 } 127 fbytes_counter++; 128 if (num != BN_num_bytes(tmp) || !BN_bn2bin(tmp, buf)) 129 ret = 0; 130 else 131 ret = 1; 132 BN_free(tmp); 133 return ret; 134 } 135 136 /* some tests from the X9.62 draft */ 137 int x9_62_test_internal(BIO *out, int nid, const char *r_in, const char *s_in) 138 { 139 int ret = 0; 140 const char message[] = "abc"; 141 unsigned char digest[20]; 142 unsigned int dgst_len = 0; 143 EVP_MD_CTX *md_ctx = EVP_MD_CTX_new(); 144 EC_KEY *key = NULL; 145 ECDSA_SIG *signature = NULL; 146 BIGNUM *r = NULL, *s = NULL; 147 BIGNUM *kinv = NULL, *rp = NULL; 148 const BIGNUM *sig_r, *sig_s; 149 150 if (md_ctx == NULL) 151 goto x962_int_err; 152 153 /* get the message digest */ 154 if (!EVP_DigestInit(md_ctx, EVP_sha1()) 155 || !EVP_DigestUpdate(md_ctx, (const void *)message, 3) 156 || !EVP_DigestFinal(md_ctx, digest, &dgst_len)) 157 goto x962_int_err; 158 159 BIO_printf(out, "testing %s: ", OBJ_nid2sn(nid)); 160 /* create the key */ 161 if ((key = EC_KEY_new_by_curve_name(nid)) == NULL) 162 goto x962_int_err; 163 use_fake = 1; 164 if (!EC_KEY_generate_key(key)) 165 goto x962_int_err; 166 BIO_printf(out, "."); 167 (void)BIO_flush(out); 168 /* create the signature */ 169 use_fake = 1; 170 /* Use ECDSA_sign_setup to avoid use of ECDSA nonces */ 171 if (!ECDSA_sign_setup(key, NULL, &kinv, &rp)) 172 goto x962_int_err; 173 signature = ECDSA_do_sign_ex(digest, 20, kinv, rp, key); 174 if (signature == NULL) 175 goto x962_int_err; 176 BIO_printf(out, "."); 177 (void)BIO_flush(out); 178 /* compare the created signature with the expected signature */ 179 if ((r = BN_new()) == NULL || (s = BN_new()) == NULL) 180 goto x962_int_err; 181 if (!BN_dec2bn(&r, r_in) || !BN_dec2bn(&s, s_in)) 182 goto x962_int_err; 183 ECDSA_SIG_get0(signature, &sig_r, &sig_s); 184 if (BN_cmp(sig_r, r) || BN_cmp(sig_s, s)) 185 goto x962_int_err; 186 BIO_printf(out, "."); 187 (void)BIO_flush(out); 188 /* verify the signature */ 189 if (ECDSA_do_verify(digest, 20, signature, key) != 1) 190 goto x962_int_err; 191 BIO_printf(out, "."); 192 (void)BIO_flush(out); 193 194 BIO_printf(out, " ok\n"); 195 ret = 1; 196 x962_int_err: 197 if (!ret) 198 BIO_printf(out, " failed\n"); 199 EC_KEY_free(key); 200 ECDSA_SIG_free(signature); 201 BN_free(r); 202 BN_free(s); 203 EVP_MD_CTX_free(md_ctx); 204 BN_clear_free(kinv); 205 BN_clear_free(rp); 206 return ret; 207 } 208 209 int x9_62_tests(BIO *out) 210 { 211 int ret = 0; 212 213 BIO_printf(out, "some tests from X9.62:\n"); 214 215 /* set own rand method */ 216 if (!change_rand()) 217 goto x962_err; 218 219 if (!x9_62_test_internal(out, NID_X9_62_prime192v1, 220 "3342403536405981729393488334694600415596881826869351677613", 221 "5735822328888155254683894997897571951568553642892029982342")) 222 goto x962_err; 223 if (!x9_62_test_internal(out, NID_X9_62_prime239v1, 224 "3086361431751678114926225473006680188549593787585317781474" 225 "62058306432176", 226 "3238135532097973577080787768312505059318910517550078427819" 227 "78505179448783")) 228 goto x962_err; 229 # ifndef OPENSSL_NO_EC2M 230 if (!x9_62_test_internal(out, NID_X9_62_c2tnb191v1, 231 "87194383164871543355722284926904419997237591535066528048", 232 "308992691965804947361541664549085895292153777025772063598")) 233 goto x962_err; 234 if (!x9_62_test_internal(out, NID_X9_62_c2tnb239v1, 235 "2159633321041961198501834003903461262881815148684178964245" 236 "5876922391552", 237 "1970303740007316867383349976549972270528498040721988191026" 238 "49413465737174")) 239 goto x962_err; 240 # endif 241 ret = 1; 242 x962_err: 243 if (!restore_rand()) 244 ret = 0; 245 return ret; 246 } 247 248 int test_builtin(BIO *out) 249 { 250 EC_builtin_curve *curves = NULL; 251 size_t crv_len = 0, n = 0; 252 EC_KEY *eckey = NULL, *wrong_eckey = NULL; 253 EC_GROUP *group; 254 ECDSA_SIG *ecdsa_sig = NULL, *modified_sig = NULL; 255 unsigned char digest[20], wrong_digest[20]; 256 unsigned char *signature = NULL; 257 const unsigned char *sig_ptr; 258 unsigned char *sig_ptr2; 259 unsigned char *raw_buf = NULL; 260 const BIGNUM *sig_r, *sig_s; 261 BIGNUM *modified_r = NULL, *modified_s = NULL; 262 BIGNUM *unmodified_r = NULL, *unmodified_s = NULL; 263 unsigned int sig_len, degree, r_len, s_len, bn_len, buf_len; 264 int nid, ret = 0; 265 266 /* fill digest values with some random data */ 267 if (RAND_bytes(digest, 20) <= 0 || RAND_bytes(wrong_digest, 20) <= 0) { 268 BIO_printf(out, "ERROR: unable to get random data\n"); 269 goto builtin_err; 270 } 271 272 /* 273 * create and verify a ecdsa signature with every available curve (with ) 274 */ 275 BIO_printf(out, "\ntesting ECDSA_sign() and ECDSA_verify() " 276 "with some internal curves:\n"); 277 278 /* get a list of all internal curves */ 279 crv_len = EC_get_builtin_curves(NULL, 0); 280 curves = OPENSSL_malloc(sizeof(*curves) * crv_len); 281 if (curves == NULL) { 282 BIO_printf(out, "malloc error\n"); 283 goto builtin_err; 284 } 285 286 if (!EC_get_builtin_curves(curves, crv_len)) { 287 BIO_printf(out, "unable to get internal curves\n"); 288 goto builtin_err; 289 } 290 291 /* now create and verify a signature for every curve */ 292 for (n = 0; n < crv_len; n++) { 293 unsigned char dirt, offset; 294 295 nid = curves[n].nid; 296 if (nid == NID_ipsec4 || nid == NID_X25519) 297 continue; 298 /* create new ecdsa key (== EC_KEY) */ 299 if ((eckey = EC_KEY_new()) == NULL) 300 goto builtin_err; 301 group = EC_GROUP_new_by_curve_name(nid); 302 if (group == NULL) 303 goto builtin_err; 304 if (EC_KEY_set_group(eckey, group) == 0) 305 goto builtin_err; 306 EC_GROUP_free(group); 307 degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey)); 308 if (degree < 160) { 309 /* drop the curve */ 310 EC_KEY_free(eckey); 311 eckey = NULL; 312 continue; 313 } 314 BIO_printf(out, "%s: ", OBJ_nid2sn(nid)); 315 /* create key */ 316 if (!EC_KEY_generate_key(eckey)) { 317 BIO_printf(out, " failed\n"); 318 goto builtin_err; 319 } 320 /* create second key */ 321 if ((wrong_eckey = EC_KEY_new()) == NULL) 322 goto builtin_err; 323 group = EC_GROUP_new_by_curve_name(nid); 324 if (group == NULL) 325 goto builtin_err; 326 if (EC_KEY_set_group(wrong_eckey, group) == 0) 327 goto builtin_err; 328 EC_GROUP_free(group); 329 if (!EC_KEY_generate_key(wrong_eckey)) { 330 BIO_printf(out, " failed\n"); 331 goto builtin_err; 332 } 333 334 BIO_printf(out, "."); 335 (void)BIO_flush(out); 336 /* check key */ 337 if (!EC_KEY_check_key(eckey)) { 338 BIO_printf(out, " failed\n"); 339 goto builtin_err; 340 } 341 BIO_printf(out, "."); 342 (void)BIO_flush(out); 343 /* create signature */ 344 sig_len = ECDSA_size(eckey); 345 if ((signature = OPENSSL_malloc(sig_len)) == NULL) 346 goto builtin_err; 347 if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey)) { 348 BIO_printf(out, " failed\n"); 349 goto builtin_err; 350 } 351 BIO_printf(out, "."); 352 (void)BIO_flush(out); 353 /* verify signature */ 354 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) { 355 BIO_printf(out, " failed\n"); 356 goto builtin_err; 357 } 358 BIO_printf(out, "."); 359 (void)BIO_flush(out); 360 /* verify signature with the wrong key */ 361 if (ECDSA_verify(0, digest, 20, signature, sig_len, wrong_eckey) == 1) { 362 BIO_printf(out, " failed\n"); 363 goto builtin_err; 364 } 365 BIO_printf(out, "."); 366 (void)BIO_flush(out); 367 /* wrong digest */ 368 if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len, eckey) == 1) { 369 BIO_printf(out, " failed\n"); 370 goto builtin_err; 371 } 372 BIO_printf(out, "."); 373 (void)BIO_flush(out); 374 /* wrong length */ 375 if (ECDSA_verify(0, digest, 20, signature, sig_len - 1, eckey) == 1) { 376 BIO_printf(out, " failed\n"); 377 goto builtin_err; 378 } 379 BIO_printf(out, "."); 380 (void)BIO_flush(out); 381 382 /* 383 * Modify a single byte of the signature: to ensure we don't garble 384 * the ASN1 structure, we read the raw signature and modify a byte in 385 * one of the bignums directly. 386 */ 387 sig_ptr = signature; 388 if ((ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)) == NULL) { 389 BIO_printf(out, " failed\n"); 390 goto builtin_err; 391 } 392 393 ECDSA_SIG_get0(ecdsa_sig, &sig_r, &sig_s); 394 395 /* Store the two BIGNUMs in raw_buf. */ 396 r_len = BN_num_bytes(sig_r); 397 s_len = BN_num_bytes(sig_s); 398 bn_len = (degree + 7) / 8; 399 if ((r_len > bn_len) || (s_len > bn_len)) { 400 BIO_printf(out, " failed\n"); 401 goto builtin_err; 402 } 403 buf_len = 2 * bn_len; 404 if ((raw_buf = OPENSSL_zalloc(buf_len)) == NULL) 405 goto builtin_err; 406 BN_bn2bin(sig_r, raw_buf + bn_len - r_len); 407 BN_bn2bin(sig_s, raw_buf + buf_len - s_len); 408 409 /* Modify a single byte in the buffer. */ 410 offset = raw_buf[10] % buf_len; 411 dirt = raw_buf[11] ? raw_buf[11] : 1; 412 raw_buf[offset] ^= dirt; 413 /* Now read the BIGNUMs back in from raw_buf. */ 414 modified_sig = ECDSA_SIG_new(); 415 if (modified_sig == NULL) 416 goto builtin_err; 417 if (((modified_r = BN_bin2bn(raw_buf, bn_len, NULL)) == NULL) 418 || ((modified_s = BN_bin2bn(raw_buf + bn_len, bn_len, NULL)) == NULL) 419 || !ECDSA_SIG_set0(modified_sig, modified_r, modified_s)) { 420 BN_free(modified_r); 421 BN_free(modified_s); 422 goto builtin_err; 423 } 424 sig_ptr2 = signature; 425 sig_len = i2d_ECDSA_SIG(modified_sig, &sig_ptr2); 426 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1) { 427 BIO_printf(out, " failed\n"); 428 goto builtin_err; 429 } 430 /* 431 * Sanity check: undo the modification and verify signature. 432 */ 433 raw_buf[offset] ^= dirt; 434 if (((unmodified_r = BN_bin2bn(raw_buf, bn_len, NULL)) == NULL) 435 || ((unmodified_s = BN_bin2bn(raw_buf + bn_len, bn_len, NULL)) == NULL) 436 || !ECDSA_SIG_set0(modified_sig, unmodified_r, unmodified_s)) { 437 BN_free(unmodified_r); 438 BN_free(unmodified_s); 439 goto builtin_err; 440 } 441 442 sig_ptr2 = signature; 443 sig_len = i2d_ECDSA_SIG(modified_sig, &sig_ptr2); 444 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) { 445 BIO_printf(out, " failed\n"); 446 goto builtin_err; 447 } 448 BIO_printf(out, "."); 449 (void)BIO_flush(out); 450 451 BIO_printf(out, " ok\n"); 452 /* cleanup */ 453 /* clean bogus errors */ 454 ERR_clear_error(); 455 OPENSSL_free(signature); 456 signature = NULL; 457 EC_KEY_free(eckey); 458 eckey = NULL; 459 EC_KEY_free(wrong_eckey); 460 wrong_eckey = NULL; 461 ECDSA_SIG_free(ecdsa_sig); 462 ecdsa_sig = NULL; 463 ECDSA_SIG_free(modified_sig); 464 modified_sig = NULL; 465 OPENSSL_free(raw_buf); 466 raw_buf = NULL; 467 } 468 469 ret = 1; 470 builtin_err: 471 EC_KEY_free(eckey); 472 EC_KEY_free(wrong_eckey); 473 ECDSA_SIG_free(ecdsa_sig); 474 ECDSA_SIG_free(modified_sig); 475 OPENSSL_free(signature); 476 OPENSSL_free(raw_buf); 477 OPENSSL_free(curves); 478 479 return ret; 480 } 481 482 int main(void) 483 { 484 int ret = 1; 485 BIO *out; 486 char *p; 487 488 out = BIO_new_fp(stdout, BIO_NOCLOSE | BIO_FP_TEXT); 489 490 p = getenv("OPENSSL_DEBUG_MEMORY"); 491 if (p != NULL && strcmp(p, "on") == 0) 492 CRYPTO_set_mem_debug(1); 493 494 /* initialize the prng */ 495 RAND_seed(rnd_seed, sizeof(rnd_seed)); 496 497 /* the tests */ 498 if (!x9_62_tests(out)) 499 goto err; 500 if (!test_builtin(out)) 501 goto err; 502 503 ret = 0; 504 err: 505 if (ret) 506 BIO_printf(out, "\nECDSA test failed\n"); 507 else 508 BIO_printf(out, "\nECDSA test passed\n"); 509 if (ret) 510 ERR_print_errors(out); 511 512 #ifndef OPENSSL_NO_CRYPTO_MDEBUG 513 if (CRYPTO_mem_leaks(out) <= 0) 514 ret = 1; 515 #endif 516 BIO_free(out); 517 return ret; 518 } 519 #endif 520