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         const unsigned char     *sig_ptr;
 302         unsigned char   *sig_ptr2;
 303         unsigned char   *raw_buf = NULL;
 304         unsigned int    sig_len, degree, r_len, s_len, bn_len, buf_len;
 305         int             nid, ret =  0;
 306
 307         /* fill digest values with some random data */
 308         if (!RAND_pseudo_bytes(digest, 20) ||
 309             !RAND_pseudo_bytes(wrong_digest, 20))
 310                 {
 311                 BIO_printf(out, "ERROR: unable to get random data\n");
 312                 goto builtin_err;
 313                 }
 314
 315         /* create and verify a ecdsa signature with every availble curve
 316          * (with ) */
 317         BIO_printf(out, "\ntesting ECDSA_sign() and ECDSA_verify() "
 318                 "with some internal curves:\n");
 319
 320         /* get a list of all internal curves */
 321         crv_len = EC_get_builtin_curves(NULL, 0);
 322
 323         curves = OPENSSL_malloc(sizeof(EC_builtin_curve) * crv_len);
 324
 325         if (curves == NULL)
 326                 {
 327                 BIO_printf(out, "malloc error\n");
 328                 goto builtin_err;
 329                 }
 330
 331         if (!EC_get_builtin_curves(curves, crv_len))
 332                 {
 333                 BIO_printf(out, "unable to get internal curves\n");
 334                 goto builtin_err;
 335                 }
 336
 337         /* now create and verify a signature for every curve */
 338         for (n = 0; n < crv_len; n++)
 339                 {
 340                 unsigned char dirt, offset;
 341
 342                 nid = curves[n].nid;
 343                 if (nid == NID_ipsec4)
 344                         continue;
 345                 /* create new ecdsa key (== EC_KEY) */
 346                 if ((eckey = EC_KEY_new()) == NULL)
 347                         goto builtin_err;
 348                 group = EC_GROUP_new_by_curve_name(nid);
 349                 if (group == NULL)
 350                         goto builtin_err;
 351                 if (EC_KEY_set_group(eckey, group) == 0)
 352                         goto builtin_err;
 353                 EC_GROUP_free(group);
 354                 degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey));
 355                 if (degree < 160)
 356                         /* drop the curve */
 357                         {
 358                         EC_KEY_free(eckey);
 359                         eckey = NULL;
 360                         continue;
 361                         }
 362                 BIO_printf(out, "%s: ", OBJ_nid2sn(nid));
 363                 /* create key */
 364                 if (!EC_KEY_generate_key(eckey))
 365                         {
 366                         BIO_printf(out, " failed\n");
 367                         goto builtin_err;
 368                         }
 369                 /* create second key */
 370                 if ((wrong_eckey = EC_KEY_new()) == NULL)
 371                         goto builtin_err;
 372                 group = EC_GROUP_new_by_curve_name(nid);
 373                 if (group == NULL)
 374                         goto builtin_err;
 375                 if (EC_KEY_set_group(wrong_eckey, group) == 0)
 376                         goto builtin_err;
 377                 EC_GROUP_free(group);
 378                 if (!EC_KEY_generate_key(wrong_eckey))
 379                         {
 380                         BIO_printf(out, " failed\n");
 381                         goto builtin_err;
 382                         }
 383
 384                 BIO_printf(out, ".");
 385                 (void)BIO_flush(out);
 386                 /* check key */
 387                 if (!EC_KEY_check_key(eckey))
 388                         {
 389                         BIO_printf(out, " failed\n");
 390                         goto builtin_err;
 391                         }
 392                 BIO_printf(out, ".");
 393                 (void)BIO_flush(out);
 394                 /* create signature */
 395                 sig_len = ECDSA_size(eckey);
 396                 if ((signature = OPENSSL_malloc(sig_len)) == NULL)
 397                         goto builtin_err;
 398                 if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey))
 399                         {
 400                         BIO_printf(out, " failed\n");
 401                         goto builtin_err;
 402                         }
 403                 BIO_printf(out, ".");
 404                 (void)BIO_flush(out);
 405                 /* verify signature */
 406                 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1)
 407                         {
 408                         BIO_printf(out, " failed\n");
 409                         goto builtin_err;
 410                         }
 411                 BIO_printf(out, ".");
 412                 (void)BIO_flush(out);
 413                 /* verify signature with the wrong key */
 414                 if (ECDSA_verify(0, digest, 20, signature, sig_len,
 415                         wrong_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 digest */
 423                 if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len,
 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                 /* wrong length */
 432                 if (ECDSA_verify(0, digest, 20, signature, sig_len - 1,
 433                         eckey) == 1)
 434                         {
 435                         BIO_printf(out, " failed\n");
 436                         goto builtin_err;
 437                         }
 438                 BIO_printf(out, ".");
 439                 (void)BIO_flush(out);
 440
 441                 /* Modify a single byte of the signature: to ensure we don't
 442                  * garble the ASN1 structure, we read the raw signature and
 443                  * modify a byte in one of the bignums directly. */
 444                 sig_ptr = signature;
 445                 if ((ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)) == NULL)
 446                         {
 447                         BIO_printf(out, " failed\n");
 448                         goto builtin_err;
 449                         }
 450
 451                 /* Store the two BIGNUMs in raw_buf. */
 452                 r_len = BN_num_bytes(ecdsa_sig->r);
 453                 s_len = BN_num_bytes(ecdsa_sig->s);
 454                 bn_len = (degree + 7) / 8;
 455                 if ((r_len > bn_len) || (s_len > bn_len))
 456                         {
 457                         BIO_printf(out, " failed\n");
 458                         goto builtin_err;
 459                         }
 460                 buf_len = 2 * bn_len;
 461                 if ((raw_buf = OPENSSL_malloc(buf_len)) == NULL)
 462                         goto builtin_err;
 463                 /* Pad the bignums with leading zeroes. */
 464                 memset(raw_buf, 0, buf_len);
 465                 BN_bn2bin(ecdsa_sig->r, raw_buf + bn_len - r_len);
 466                 BN_bn2bin(ecdsa_sig->s, raw_buf + buf_len - s_len);
 467
 468                 /* Modify a single byte in the buffer. */
 469                 offset = raw_buf[10] % buf_len;
 470                 dirt   = raw_buf[11] ? raw_buf[11] : 1;
 471                 raw_buf[offset] ^= dirt;
 472                 /* Now read the BIGNUMs back in from raw_buf. */
 473                 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) ||
 474                         (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL))
 475                         goto builtin_err;
 476
 477                 sig_ptr2 = signature;
 478                 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2);
 479                 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1)
 480                         {
 481                         BIO_printf(out, " failed\n");
 482                         goto builtin_err;
 483                         }
 484                 /* Sanity check: undo the modification and verify signature. */
 485                 raw_buf[offset] ^= dirt;
 486                 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) ||
 487                         (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL))
 488                         goto builtin_err;
 489
 490                 sig_ptr2 = signature;
 491                 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2);
 492                 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1)
 493                         {
 494                         BIO_printf(out, " failed\n");
 495                         goto builtin_err;
 496                         }
 497                 BIO_printf(out, ".");
 498                 (void)BIO_flush(out);
 499
 500                 BIO_printf(out, " ok\n");
 501                 /* cleanup */
 502                 /* clean bogus errors */
 503                 ERR_clear_error();
 504                 OPENSSL_free(signature);
 505                 signature = NULL;
 506                 EC_KEY_free(eckey);
 507                 eckey = NULL;
 508                 EC_KEY_free(wrong_eckey);
 509                 wrong_eckey = NULL;
 510                 ECDSA_SIG_free(ecdsa_sig);
 511                 ecdsa_sig = NULL;
 512                 OPENSSL_free(raw_buf);
 513                 raw_buf = NULL;
 514                 }
 515
 516         ret = 1;
 517 builtin_err:
 518         if (eckey)
 519                 EC_KEY_free(eckey);
 520         if (wrong_eckey)
 521                 EC_KEY_free(wrong_eckey);
 522         if (ecdsa_sig)
 523                 ECDSA_SIG_free(ecdsa_sig);
 524         if (signature)
 525                 OPENSSL_free(signature);
 526         if (raw_buf)
 527                 OPENSSL_free(raw_buf);
 528         if (curves)
 529                 OPENSSL_free(curves);
 530
 531         return ret;
 532         }
 533
 534 int main(void)
 535         {
 536         int     ret = 1;
 537         BIO     *out;
 538
 539         out = BIO_new_fp(stdout, BIO_NOCLOSE);
 540
 541         /* enable memory leak checking unless explicitly disabled */
 542         if (!((getenv("OPENSSL_DEBUG_MEMORY") != NULL) &&
 543                 (0 == strcmp(getenv("OPENSSL_DEBUG_MEMORY"), "off"))))
 544                 {
 545                 CRYPTO_malloc_debug_init();
 546                 CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL);
 547                 }
 548         else
 549                 {
 550                 /* OPENSSL_DEBUG_MEMORY=off */
 551                 CRYPTO_set_mem_debug_functions(0, 0, 0, 0, 0);
 552                 }
 553         CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
 554
 555         ERR_load_crypto_strings();
 556
 557         /* initialize the prng */
 558         RAND_seed(rnd_seed, sizeof(rnd_seed));
 559
 560         /* the tests */
 561         if (!x9_62_tests(out))  goto err;
 562         if (!test_builtin(out)) goto err;
 563
 564         ret = 0;
 565 err:
 566         if (ret)
 567                 BIO_printf(out, "\nECDSA test failed\n");
 568         else
 569                 BIO_printf(out, "\nECDSA test passed\n");
 570         if (ret)
 571                 ERR_print_errors(out);
 572         CRYPTO_cleanup_all_ex_data();
 573         ERR_remove_thread_state(NULL);
 574         ERR_free_strings();
 575         CRYPTO_mem_leaks(out);
 576         if (out != NULL)
 577                 BIO_free(out);
 578         return ret;
 579         }
 580 #endif