crypto/ecdsa/ecdsatest.c

   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, use_fake = 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 (use_fake == 0)
 161                 return old_rand->bytes(buf, num);
 162
 163         use_fake = 0;
 164
 165         if (fbytes_counter >= 8)
 166                 return 0;
 167         tmp = BN_new();
 168         if (!tmp)
 169                 return 0;
 170         if (!BN_dec2bn(&tmp, numbers[fbytes_counter]))
 171                 {
 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 */
 186 int 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         if (!EVP_DigestInit(&md_ctx, EVP_ecdsa())
 200             || !EVP_DigestUpdate(&md_ctx, (const void*)message, 3)
 201             || !EVP_DigestFinal(&md_ctx, digest, &dgst_len))
 202                 goto x962_int_err;
 203
 204         BIO_printf(out, "testing %s: ", OBJ_nid2sn(nid));
 205         /* create the key */
 206         if ((key = EC_KEY_new_by_curve_name(nid)) == NULL)
 207                 goto x962_int_err;
 208         use_fake = 1;
 209         if (!EC_KEY_generate_key(key))
 210                 goto x962_int_err;
 211         BIO_printf(out, ".");
 212         (void)BIO_flush(out);
 213         /* create the signature */
 214         use_fake = 1;
 215         signature = ECDSA_do_sign(digest, 20, key);
 216         if (signature == NULL)
 217                 goto x962_int_err;
 218         BIO_printf(out, ".");
 219         (void)BIO_flush(out);
 220         /* compare the created signature with the expected signature */
 221         if ((r = BN_new()) == NULL || (s = BN_new()) == NULL)
 222                 goto x962_int_err;
 223         if (!BN_dec2bn(&r, r_in) ||
 224             !BN_dec2bn(&s, s_in))
 225                 goto x962_int_err;
 226         if (BN_cmp(signature->r ,r) || BN_cmp(signature->s, s))
 227                 goto x962_int_err;
 228         BIO_printf(out, ".");
 229         (void)BIO_flush(out);
 230         /* verify the signature */
 231         if (ECDSA_do_verify(digest, 20, signature, key) != 1)
 232                 goto x962_int_err;
 233         BIO_printf(out, ".");
 234         (void)BIO_flush(out);
 235
 236         BIO_printf(out, " ok\n");
 237         ret = 1;
 238 x962_int_err:
 239         if (!ret)
 240                 BIO_printf(out, " failed\n");
 241         if (key)
 242                 EC_KEY_free(key);
 243         if (signature)
 244                 ECDSA_SIG_free(signature);
 245         if (r)
 246                 BN_free(r);
 247         if (s)
 248                 BN_free(s);
 249         EVP_MD_CTX_cleanup(&md_ctx);
 250         return ret;
 251         }
 252
 253 int x9_62_tests(BIO *out)
 254         {
 255         int ret = 0;
 256
 257         BIO_printf(out, "some tests from X9.62:\n");
 258
 259         /* set own rand method */
 260         if (!change_rand())
 261                 goto x962_err;
 262
 263         if (!x9_62_test_internal(out, NID_X9_62_prime192v1,
 264                 "3342403536405981729393488334694600415596881826869351677613",
 265                 "5735822328888155254683894997897571951568553642892029982342"))
 266                 goto x962_err;
 267         if (!x9_62_test_internal(out, NID_X9_62_prime239v1,
 268                 "3086361431751678114926225473006680188549593787585317781474"
 269                 "62058306432176",
 270                 "3238135532097973577080787768312505059318910517550078427819"
 271                 "78505179448783"))
 272                 goto x962_err;
 273 #ifndef OPENSSL_NO_EC2M
 274         if (!x9_62_test_internal(out, NID_X9_62_c2tnb191v1,
 275                 "87194383164871543355722284926904419997237591535066528048",
 276                 "308992691965804947361541664549085895292153777025772063598"))
 277                 goto x962_err;
 278         if (!x9_62_test_internal(out, NID_X9_62_c2tnb239v1,
 279                 "2159633321041961198501834003903461262881815148684178964245"
 280                 "5876922391552",
 281                 "1970303740007316867383349976549972270528498040721988191026"
 282                 "49413465737174"))
 283                 goto x962_err;
 284 #endif
 285         ret = 1;
 286 x962_err:
 287         if (!restore_rand())
 288                 ret = 0;
 289         return ret;
 290         }
 291
 292 int test_builtin(BIO *out)
 293         {
 294         EC_builtin_curve *curves = NULL;
 295         size_t          crv_len = 0, n = 0;
 296         EC_KEY          *eckey = NULL, *wrong_eckey = NULL;
 297         EC_GROUP        *group;
 298         ECDSA_SIG       *ecdsa_sig = NULL;
 299         unsigned char   digest[20], wrong_digest[20];
 300         unsigned char   *signature = NULL;
 301         unsigned char   *sig_ptr;
 302         unsigned char   *raw_buf = NULL;
 303         unsigned int    sig_len, degree, r_len, s_len, bn_len, buf_len;
 304         int             nid, ret =  0;
 305
 306         /* fill digest values with some random data */
 307         if (!RAND_pseudo_bytes(digest, 20) ||
 308             !RAND_pseudo_bytes(wrong_digest, 20))
 309                 {
 310                 BIO_printf(out, "ERROR: unable to get random data\n");
 311                 goto builtin_err;
 312                 }
 313
 314         /* create and verify a ecdsa signature with every availble curve
 315          * (with ) */
 316         BIO_printf(out, "\ntesting ECDSA_sign() and ECDSA_verify() "
 317                 "with some internal curves:\n");
 318
 319         /* get a list of all internal curves */
 320         crv_len = EC_get_builtin_curves(NULL, 0);
 321
 322         curves = OPENSSL_malloc(sizeof(EC_builtin_curve) * crv_len);
 323
 324         if (curves == NULL)
 325                 {
 326                 BIO_printf(out, "malloc error\n");
 327                 goto builtin_err;
 328                 }
 329
 330         if (!EC_get_builtin_curves(curves, crv_len))
 331                 {
 332                 BIO_printf(out, "unable to get internal curves\n");
 333                 goto builtin_err;
 334                 }
 335
 336         /* now create and verify a signature for every curve */
 337         for (n = 0; n < crv_len; n++)
 338                 {
 339                 unsigned char dirt, offset;
 340
 341                 nid = curves[n].nid;
 342                 if (nid == NID_ipsec4)
 343                         continue;
 344                 /* create new ecdsa key (== EC_KEY) */
 345                 if ((eckey = EC_KEY_new()) == NULL)
 346                         goto builtin_err;
 347                 group = EC_GROUP_new_by_curve_name(nid);
 348                 if (group == NULL)
 349                         goto builtin_err;
 350                 if (EC_KEY_set_group(eckey, group) == 0)
 351                         goto builtin_err;
 352                 EC_GROUP_free(group);
 353                 degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey));
 354                 if (degree < 160)
 355                         /* drop the curve */
 356                         {
 357                         EC_KEY_free(eckey);
 358                         eckey = NULL;
 359                         continue;
 360                         }
 361                 BIO_printf(out, "%s: ", OBJ_nid2sn(nid));
 362                 /* create key */
 363                 if (!EC_KEY_generate_key(eckey))
 364                         {
 365                         BIO_printf(out, " failed\n");
 366                         goto builtin_err;
 367                         }
 368                 /* create second key */
 369                 if ((wrong_eckey = EC_KEY_new()) == NULL)
 370                         goto builtin_err;
 371                 group = EC_GROUP_new_by_curve_name(nid);
 372                 if (group == NULL)
 373                         goto builtin_err;
 374                 if (EC_KEY_set_group(wrong_eckey, group) == 0)
 375                         goto builtin_err;
 376                 EC_GROUP_free(group);
 377                 if (!EC_KEY_generate_key(wrong_eckey))
 378                         {
 379                         BIO_printf(out, " failed\n");
 380                         goto builtin_err;
 381                         }
 382
 383                 BIO_printf(out, ".");
 384                 (void)BIO_flush(out);
 385                 /* check key */
 386                 if (!EC_KEY_check_key(eckey))
 387                         {
 388                         BIO_printf(out, " failed\n");
 389                         goto builtin_err;
 390                         }
 391                 BIO_printf(out, ".");
 392                 (void)BIO_flush(out);
 393                 /* create signature */
 394                 sig_len = ECDSA_size(eckey);
 395                 if ((signature = OPENSSL_malloc(sig_len)) == NULL)
 396                         goto builtin_err;
 397                 if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey))
 398                         {
 399                         BIO_printf(out, " failed\n");
 400                         goto builtin_err;
 401                         }
 402                 BIO_printf(out, ".");
 403                 (void)BIO_flush(out);
 404                 /* verify signature */
 405                 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1)
 406                         {
 407                         BIO_printf(out, " failed\n");
 408                         goto builtin_err;
 409                         }
 410                 BIO_printf(out, ".");
 411                 (void)BIO_flush(out);
 412                 /* verify signature with the wrong key */
 413                 if (ECDSA_verify(0, digest, 20, signature, sig_len,
 414                         wrong_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 digest */
 422                 if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len,
 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                 /* wrong length */
 431                 if (ECDSA_verify(0, digest, 20, signature, sig_len - 1,
 432                         eckey) == 1)
 433                         {
 434                         BIO_printf(out, " failed\n");
 435                         goto builtin_err;
 436                         }
 437                 BIO_printf(out, ".");
 438                 (void)BIO_flush(out);
 439
 440                 /* Modify a single byte of the signature: to ensure we don't
 441                  * garble the ASN1 structure, we read the raw signature and
 442                  * modify a byte in one of the bignums directly. */
 443                 sig_ptr = signature;
 444                 if ((ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)) == NULL)
 445                         {
 446                         BIO_printf(out, " failed\n");
 447                         goto builtin_err;
 448                         }
 449
 450                 /* Store the two BIGNUMs in raw_buf. */
 451                 r_len = BN_num_bytes(ecdsa_sig->r);
 452                 s_len = BN_num_bytes(ecdsa_sig->s);
 453                 bn_len = (degree + 7) / 8;
 454                 if ((r_len > bn_len) || (s_len > bn_len))
 455                         {
 456                         BIO_printf(out, " failed\n");
 457                         goto builtin_err;
 458                         }
 459                 buf_len = 2 * bn_len;
 460                 if ((raw_buf = OPENSSL_malloc(buf_len)) == NULL)
 461                         goto builtin_err;
 462                 /* Pad the bignums with leading zeroes. */
 463                 memset(raw_buf, 0, buf_len);
 464                 BN_bn2bin(ecdsa_sig->r, raw_buf + bn_len - r_len);
 465                 BN_bn2bin(ecdsa_sig->s, raw_buf + buf_len - s_len);
 466
 467                 /* Modify a single byte in the buffer. */
 468                 offset = raw_buf[10] % buf_len;
 469                 dirt   = raw_buf[11] ? raw_buf[11] : 1;
 470                 raw_buf[offset] ^= dirt;
 471                 /* Now read the BIGNUMs back in from raw_buf. */
 472                 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) ||
 473                         (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL))
 474                         goto builtin_err;
 475
 476                 sig_ptr = signature;
 477                 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr);
 478                 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1)
 479                         {
 480                         BIO_printf(out, " failed\n");
 481                         goto builtin_err;
 482                         }
 483                 /* Sanity check: undo the modification and verify signature. */
 484                 raw_buf[offset] ^= dirt;
 485                 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) ||
 486                         (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL))
 487                         goto builtin_err;
 488
 489                 sig_ptr = signature;
 490                 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr);
 491                 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1)
 492                         {
 493                         BIO_printf(out, " failed\n");
 494                         goto builtin_err;
 495                         }
 496                 BIO_printf(out, ".");
 497                 (void)BIO_flush(out);
 498
 499                 BIO_printf(out, " ok\n");
 500                 /* cleanup */
 501                 /* clean bogus errors */
 502                 ERR_clear_error();
 503                 OPENSSL_free(signature);
 504                 signature = NULL;
 505                 EC_KEY_free(eckey);
 506                 eckey = NULL;
 507                 EC_KEY_free(wrong_eckey);
 508                 wrong_eckey = NULL;
 509                 ECDSA_SIG_free(ecdsa_sig);
 510                 ecdsa_sig = NULL;
 511                 OPENSSL_free(raw_buf);
 512                 raw_buf = NULL;
 513                 }
 514
 515         ret = 1;
 516 builtin_err:
 517         if (eckey)
 518                 EC_KEY_free(eckey);
 519         if (wrong_eckey)
 520                 EC_KEY_free(wrong_eckey);
 521         if (ecdsa_sig)
 522                 ECDSA_SIG_free(ecdsa_sig);
 523         if (signature)
 524                 OPENSSL_free(signature);
 525         if (raw_buf)
 526                 OPENSSL_free(raw_buf);
 527         if (curves)
 528                 OPENSSL_free(curves);
 529
 530         return ret;
 531         }
 532
 533 int main(void)
 534         {
 535         int     ret = 1;
 536         BIO     *out;
 537
 538         out = BIO_new_fp(stdout, BIO_NOCLOSE);
 539
 540         /* enable memory leak checking unless explicitly disabled */
 541         if (!((getenv("OPENSSL_DEBUG_MEMORY") != NULL) &&
 542                 (0 == strcmp(getenv("OPENSSL_DEBUG_MEMORY"), "off"))))
 543                 {
 544                 CRYPTO_malloc_debug_init();
 545                 CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL);
 546                 }
 547         else
 548                 {
 549                 /* OPENSSL_DEBUG_MEMORY=off */
 550                 CRYPTO_set_mem_debug_functions(0, 0, 0, 0, 0);
 551                 }
 552         CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
 553
 554         ERR_load_crypto_strings();
 555
 556         /* initialize the prng */
 557         RAND_seed(rnd_seed, sizeof(rnd_seed));
 558
 559         /* the tests */
 560         if (!x9_62_tests(out))  goto err;
 561         if (!test_builtin(out)) goto err;
 562
 563         ret = 0;
 564 err:
 565         if (ret)
 566                 BIO_printf(out, "\nECDSA test failed\n");
 567         else
 568                 BIO_printf(out, "\nECDSA test passed\n");
 569         if (ret)
 570                 ERR_print_errors(out);
 571         CRYPTO_cleanup_all_ex_data();
 572         ERR_remove_thread_state(NULL);
 573         ERR_free_strings();
 574         CRYPTO_mem_leaks(out);
 575         if (out != NULL)
 576                 BIO_free(out);
 577         return ret;
 578         }
 579 #endif