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         BIGNUM    *kinv = NULL, *rp = NULL;
 197
 198         EVP_MD_CTX_init(&md_ctx);
 199         /* get the message digest */
 200         if (!EVP_DigestInit(&md_ctx, EVP_ecdsa())
 201             || !EVP_DigestUpdate(&md_ctx, (const void*)message, 3)
 202             || !EVP_DigestFinal(&md_ctx, digest, &dgst_len))
 203                 goto x962_int_err;
 204
 205         BIO_printf(out, "testing %s: ", OBJ_nid2sn(nid));
 206         /* create the key */
 207         if ((key = EC_KEY_new_by_curve_name(nid)) == NULL)
 208                 goto x962_int_err;
 209         use_fake = 1;
 210         if (!EC_KEY_generate_key(key))
 211                 goto x962_int_err;
 212         BIO_printf(out, ".");
 213         (void)BIO_flush(out);
 214         /* create the signature */
 215         use_fake = 1;
 216         /* Use ECDSA_sign_setup to avoid use of ECDSA nonces */
 217         if (!ECDSA_sign_setup(key, NULL, &kinv, &rp))
 218                 goto x962_int_err;
 219         signature = ECDSA_do_sign_ex(digest, 20, kinv, rp, key);
 220         if (signature == NULL)
 221                 goto x962_int_err;
 222         BIO_printf(out, ".");
 223         (void)BIO_flush(out);
 224         /* compare the created signature with the expected signature */
 225         if ((r = BN_new()) == NULL || (s = BN_new()) == NULL)
 226                 goto x962_int_err;
 227         if (!BN_dec2bn(&r, r_in) ||
 228             !BN_dec2bn(&s, s_in))
 229                 goto x962_int_err;
 230         if (BN_cmp(signature->r ,r) || BN_cmp(signature->s, s))
 231                 goto x962_int_err;
 232         BIO_printf(out, ".");
 233         (void)BIO_flush(out);
 234         /* verify the signature */
 235         if (ECDSA_do_verify(digest, 20, signature, key) != 1)
 236                 goto x962_int_err;
 237         BIO_printf(out, ".");
 238         (void)BIO_flush(out);
 239
 240         BIO_printf(out, " ok\n");
 241         ret = 1;
 242 x962_int_err:
 243         if (!ret)
 244                 BIO_printf(out, " failed\n");
 245         if (key)
 246                 EC_KEY_free(key);
 247         if (signature)
 248                 ECDSA_SIG_free(signature);
 249         if (r)
 250                 BN_free(r);
 251         if (s)
 252                 BN_free(s);
 253         EVP_MD_CTX_cleanup(&md_ctx);
 254         if (kinv)
 255                 BN_clear_free(kinv);
 256         if (rp)
 257                 BN_clear_free(rp);
 258         return ret;
 259         }
 260
 261 int x9_62_tests(BIO *out)
 262         {
 263         int ret = 0;
 264
 265         BIO_printf(out, "some tests from X9.62:\n");
 266
 267         /* set own rand method */
 268         if (!change_rand())
 269                 goto x962_err;
 270
 271         if (!x9_62_test_internal(out, NID_X9_62_prime192v1,
 272                 "3342403536405981729393488334694600415596881826869351677613",
 273                 "5735822328888155254683894997897571951568553642892029982342"))
 274                 goto x962_err;
 275         if (!x9_62_test_internal(out, NID_X9_62_prime239v1,
 276                 "3086361431751678114926225473006680188549593787585317781474"
 277                 "62058306432176",
 278                 "3238135532097973577080787768312505059318910517550078427819"
 279                 "78505179448783"))
 280                 goto x962_err;
 281 #ifndef OPENSSL_NO_EC2M
 282         if (!x9_62_test_internal(out, NID_X9_62_c2tnb191v1,
 283                 "87194383164871543355722284926904419997237591535066528048",
 284                 "308992691965804947361541664549085895292153777025772063598"))
 285                 goto x962_err;
 286         if (!x9_62_test_internal(out, NID_X9_62_c2tnb239v1,
 287                 "2159633321041961198501834003903461262881815148684178964245"
 288                 "5876922391552",
 289                 "1970303740007316867383349976549972270528498040721988191026"
 290                 "49413465737174"))
 291                 goto x962_err;
 292 #endif
 293         ret = 1;
 294 x962_err:
 295         if (!restore_rand())
 296                 ret = 0;
 297         return ret;
 298         }
 299
 300 int test_builtin(BIO *out)
 301         {
 302         EC_builtin_curve *curves = NULL;
 303         size_t          crv_len = 0, n = 0;
 304         EC_KEY          *eckey = NULL, *wrong_eckey = NULL;
 305         EC_GROUP        *group;
 306         ECDSA_SIG       *ecdsa_sig = NULL;
 307         unsigned char   digest[20], wrong_digest[20];
 308         unsigned char   *signature = NULL;
 309         const unsigned char     *sig_ptr;
 310         unsigned char   *sig_ptr2;
 311         unsigned char   *raw_buf = NULL;
 312         unsigned int    sig_len, degree, r_len, s_len, bn_len, buf_len;
 313         int             nid, ret =  0;
 314
 315         /* fill digest values with some random data */
 316         if (!RAND_pseudo_bytes(digest, 20) ||
 317             !RAND_pseudo_bytes(wrong_digest, 20))
 318                 {
 319                 BIO_printf(out, "ERROR: unable to get random data\n");
 320                 goto builtin_err;
 321                 }
 322
 323         /* create and verify a ecdsa signature with every availble curve
 324          * (with ) */
 325         BIO_printf(out, "\ntesting ECDSA_sign() and ECDSA_verify() "
 326                 "with some internal curves:\n");
 327
 328         /* get a list of all internal curves */
 329         crv_len = EC_get_builtin_curves(NULL, 0);
 330
 331         curves = OPENSSL_malloc(sizeof(EC_builtin_curve) * crv_len);
 332
 333         if (curves == NULL)
 334                 {
 335                 BIO_printf(out, "malloc error\n");
 336                 goto builtin_err;
 337                 }
 338
 339         if (!EC_get_builtin_curves(curves, crv_len))
 340                 {
 341                 BIO_printf(out, "unable to get internal curves\n");
 342                 goto builtin_err;
 343                 }
 344
 345         /* now create and verify a signature for every curve */
 346         for (n = 0; n < crv_len; n++)
 347                 {
 348                 unsigned char dirt, offset;
 349
 350                 nid = curves[n].nid;
 351                 if (nid == NID_ipsec4)
 352                         continue;
 353                 /* create new ecdsa key (== EC_KEY) */
 354                 if ((eckey = EC_KEY_new()) == NULL)
 355                         goto builtin_err;
 356                 group = EC_GROUP_new_by_curve_name(nid);
 357                 if (group == NULL)
 358                         goto builtin_err;
 359                 if (EC_KEY_set_group(eckey, group) == 0)
 360                         goto builtin_err;
 361                 EC_GROUP_free(group);
 362                 degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey));
 363                 if (degree < 160)
 364                         /* drop the curve */
 365                         {
 366                         EC_KEY_free(eckey);
 367                         eckey = NULL;
 368                         continue;
 369                         }
 370                 BIO_printf(out, "%s: ", OBJ_nid2sn(nid));
 371                 /* create key */
 372                 if (!EC_KEY_generate_key(eckey))
 373                         {
 374                         BIO_printf(out, " failed\n");
 375                         goto builtin_err;
 376                         }
 377                 /* create second key */
 378                 if ((wrong_eckey = EC_KEY_new()) == NULL)
 379                         goto builtin_err;
 380                 group = EC_GROUP_new_by_curve_name(nid);
 381                 if (group == NULL)
 382                         goto builtin_err;
 383                 if (EC_KEY_set_group(wrong_eckey, group) == 0)
 384                         goto builtin_err;
 385                 EC_GROUP_free(group);
 386                 if (!EC_KEY_generate_key(wrong_eckey))
 387                         {
 388                         BIO_printf(out, " failed\n");
 389                         goto builtin_err;
 390                         }
 391
 392                 BIO_printf(out, ".");
 393                 (void)BIO_flush(out);
 394                 /* check key */
 395                 if (!EC_KEY_check_key(eckey))
 396                         {
 397                         BIO_printf(out, " failed\n");
 398                         goto builtin_err;
 399                         }
 400                 BIO_printf(out, ".");
 401                 (void)BIO_flush(out);
 402                 /* create signature */
 403                 sig_len = ECDSA_size(eckey);
 404                 if ((signature = OPENSSL_malloc(sig_len)) == NULL)
 405                         goto builtin_err;
 406                 if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey))
 407                         {
 408                         BIO_printf(out, " failed\n");
 409                         goto builtin_err;
 410                         }
 411                 BIO_printf(out, ".");
 412                 (void)BIO_flush(out);
 413                 /* verify signature */
 414                 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1)
 415                         {
 416                         BIO_printf(out, " failed\n");
 417                         goto builtin_err;
 418                         }
 419                 BIO_printf(out, ".");
 420                 (void)BIO_flush(out);
 421                 /* verify signature with the wrong key */
 422                 if (ECDSA_verify(0, digest, 20, signature, sig_len,
 423                         wrong_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 digest */
 431                 if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len,
 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                 /* wrong length */
 440                 if (ECDSA_verify(0, digest, 20, signature, sig_len - 1,
 441                         eckey) == 1)
 442                         {
 443                         BIO_printf(out, " failed\n");
 444                         goto builtin_err;
 445                         }
 446                 BIO_printf(out, ".");
 447                 (void)BIO_flush(out);
 448
 449                 /* Modify a single byte of the signature: to ensure we don't
 450                  * garble the ASN1 structure, we read the raw signature and
 451                  * modify a byte in one of the bignums directly. */
 452                 sig_ptr = signature;
 453                 if ((ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)) == NULL)
 454                         {
 455                         BIO_printf(out, " failed\n");
 456                         goto builtin_err;
 457                         }
 458
 459                 /* Store the two BIGNUMs in raw_buf. */
 460                 r_len = BN_num_bytes(ecdsa_sig->r);
 461                 s_len = BN_num_bytes(ecdsa_sig->s);
 462                 bn_len = (degree + 7) / 8;
 463                 if ((r_len > bn_len) || (s_len > bn_len))
 464                         {
 465                         BIO_printf(out, " failed\n");
 466                         goto builtin_err;
 467                         }
 468                 buf_len = 2 * bn_len;
 469                 if ((raw_buf = OPENSSL_malloc(buf_len)) == NULL)
 470                         goto builtin_err;
 471                 /* Pad the bignums with leading zeroes. */
 472                 memset(raw_buf, 0, buf_len);
 473                 BN_bn2bin(ecdsa_sig->r, raw_buf + bn_len - r_len);
 474                 BN_bn2bin(ecdsa_sig->s, raw_buf + buf_len - s_len);
 475
 476                 /* Modify a single byte in the buffer. */
 477                 offset = raw_buf[10] % buf_len;
 478                 dirt   = raw_buf[11] ? raw_buf[11] : 1;
 479                 raw_buf[offset] ^= dirt;
 480                 /* Now read the BIGNUMs back in from raw_buf. */
 481                 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) ||
 482                         (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL))
 483                         goto builtin_err;
 484
 485                 sig_ptr2 = signature;
 486                 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2);
 487                 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1)
 488                         {
 489                         BIO_printf(out, " failed\n");
 490                         goto builtin_err;
 491                         }
 492                 /* Sanity check: undo the modification and verify signature. */
 493                 raw_buf[offset] ^= dirt;
 494                 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) ||
 495                         (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL))
 496                         goto builtin_err;
 497
 498                 sig_ptr2 = signature;
 499                 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2);
 500                 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1)
 501                         {
 502                         BIO_printf(out, " failed\n");
 503                         goto builtin_err;
 504                         }
 505                 BIO_printf(out, ".");
 506                 (void)BIO_flush(out);
 507
 508                 BIO_printf(out, " ok\n");
 509                 /* cleanup */
 510                 /* clean bogus errors */
 511                 ERR_clear_error();
 512                 OPENSSL_free(signature);
 513                 signature = NULL;
 514                 EC_KEY_free(eckey);
 515                 eckey = NULL;
 516                 EC_KEY_free(wrong_eckey);
 517                 wrong_eckey = NULL;
 518                 ECDSA_SIG_free(ecdsa_sig);
 519                 ecdsa_sig = NULL;
 520                 OPENSSL_free(raw_buf);
 521                 raw_buf = NULL;
 522                 }
 523
 524         ret = 1;
 525 builtin_err:
 526         if (eckey)
 527                 EC_KEY_free(eckey);
 528         if (wrong_eckey)
 529                 EC_KEY_free(wrong_eckey);
 530         if (ecdsa_sig)
 531                 ECDSA_SIG_free(ecdsa_sig);
 532         if (signature)
 533                 OPENSSL_free(signature);
 534         if (raw_buf)
 535                 OPENSSL_free(raw_buf);
 536         if (curves)
 537                 OPENSSL_free(curves);
 538
 539         return ret;
 540         }
 541
 542 int main(void)
 543         {
 544         int     ret = 1;
 545         BIO     *out;
 546
 547         out = BIO_new_fp(stdout, BIO_NOCLOSE);
 548
 549         /* enable memory leak checking unless explicitly disabled */
 550         if (!((getenv("OPENSSL_DEBUG_MEMORY") != NULL) &&
 551                 (0 == strcmp(getenv("OPENSSL_DEBUG_MEMORY"), "off"))))
 552                 {
 553                 CRYPTO_malloc_debug_init();
 554                 CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL);
 555                 }
 556         else
 557                 {
 558                 /* OPENSSL_DEBUG_MEMORY=off */
 559                 CRYPTO_set_mem_debug_functions(0, 0, 0, 0, 0);
 560                 }
 561         CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
 562
 563         ERR_load_crypto_strings();
 564
 565         /* initialize the prng */
 566         RAND_seed(rnd_seed, sizeof(rnd_seed));
 567
 568         /* the tests */
 569         if (!x9_62_tests(out))  goto err;
 570         if (!test_builtin(out)) goto err;
 571
 572         ret = 0;
 573 err:
 574         if (ret)
 575                 BIO_printf(out, "\nECDSA test failed\n");
 576         else
 577                 BIO_printf(out, "\nECDSA test passed\n");
 578         if (ret)
 579                 ERR_print_errors(out);
 580         CRYPTO_cleanup_all_ex_data();
 581         ERR_remove_thread_state(NULL);
 582         ERR_free_strings();
 583         CRYPTO_mem_leaks(out);
 584         if (out != NULL)
 585                 BIO_free(out);
 586         return ret;
 587         }
 588 #endif