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;
 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 (fbytes_counter >= 8)
 161                 return 0;
 162         tmp = BN_new();
 163         if (!tmp)
 164                 return 0;
 165         if (!BN_dec2bn(&tmp, numbers[fbytes_counter]))
 166                 {
 167                 BN_free(tmp);
 168                 return 0;
 169                 }
 170         fbytes_counter ++;
 171         ret = BN_bn2bin(tmp, buf);
 172         if (ret == 0 || ret != num)
 173                 ret = 0;
 174         else
 175                 ret = 1;
 176         if (tmp)
 177                 BN_free(tmp);
 178         return ret;
 179         }
 180
 181 /* some tests from the X9.62 draft */
 182 int x9_62_test_internal(BIO *out, int nid, const char *r_in, const char *s_in)
 183         {
 184         int     ret = 0;
 185         const char message[] = "abc";
 186         unsigned char digest[20];
 187         unsigned int  dgst_len = 0;
 188         EVP_MD_CTX md_ctx;
 189         EC_KEY    *key = NULL;
 190         ECDSA_SIG *signature = NULL;
 191         BIGNUM    *r = NULL, *s = NULL;
 192
 193         EVP_MD_CTX_init(&md_ctx);
 194         /* get the message digest */
 195         EVP_DigestInit(&md_ctx, EVP_ecdsa());
 196         EVP_DigestUpdate(&md_ctx, (const void*)message, 3);
 197         EVP_DigestFinal(&md_ctx, digest, &dgst_len);
 198
 199         BIO_printf(out, "testing %s: ", OBJ_nid2sn(nid));
 200         /* create the key */
 201         if ((key = EC_KEY_new_by_curve_name(nid)) == NULL)
 202                 goto x962_int_err;
 203         if (!EC_KEY_generate_key(key))
 204                 goto x962_int_err;
 205         BIO_printf(out, ".");
 206         (void)BIO_flush(out);
 207         /* create the signature */
 208         signature = ECDSA_do_sign(digest, 20, key);
 209         if (signature == NULL)
 210                 goto x962_int_err;
 211         BIO_printf(out, ".");
 212         (void)BIO_flush(out);
 213         /* compare the created signature with the expected signature */
 214         if ((r = BN_new()) == NULL || (s = BN_new()) == NULL)
 215                 goto x962_int_err;
 216         if (!BN_dec2bn(&r, r_in) ||
 217             !BN_dec2bn(&s, s_in))
 218                 goto x962_int_err;
 219         if (BN_cmp(signature->r ,r) || BN_cmp(signature->s, s))
 220                 goto x962_int_err;
 221         BIO_printf(out, ".");
 222         (void)BIO_flush(out);
 223         /* verify the signature */
 224         if (ECDSA_do_verify(digest, 20, signature, key) != 1)
 225                 goto x962_int_err;
 226         BIO_printf(out, ".");
 227         (void)BIO_flush(out);
 228
 229         BIO_printf(out, " ok\n");
 230         ret = 1;
 231 x962_int_err:
 232         if (!ret)
 233                 BIO_printf(out, " failed\n");
 234         if (key)
 235                 EC_KEY_free(key);
 236         if (signature)
 237                 ECDSA_SIG_free(signature);
 238         if (r)
 239                 BN_free(r);
 240         if (s)
 241                 BN_free(s);
 242         EVP_MD_CTX_cleanup(&md_ctx);
 243         return ret;
 244         }
 245
 246 int x9_62_tests(BIO *out)
 247         {
 248         int ret = 0;
 249
 250         BIO_printf(out, "some tests from X9.62:\n");
 251
 252         /* set own rand method */
 253         if (!change_rand())
 254                 goto x962_err;
 255
 256         if (!x9_62_test_internal(out, NID_X9_62_prime192v1,
 257                 "3342403536405981729393488334694600415596881826869351677613",
 258                 "5735822328888155254683894997897571951568553642892029982342"))
 259                 goto x962_err;
 260         if (!x9_62_test_internal(out, NID_X9_62_prime239v1,
 261                 "3086361431751678114926225473006680188549593787585317781474"
 262                 "62058306432176",
 263                 "3238135532097973577080787768312505059318910517550078427819"
 264                 "78505179448783"))
 265                 goto x962_err;
 266         if (!x9_62_test_internal(out, NID_X9_62_c2tnb191v1,
 267                 "87194383164871543355722284926904419997237591535066528048",
 268                 "308992691965804947361541664549085895292153777025772063598"))
 269                 goto x962_err;
 270         if (!x9_62_test_internal(out, NID_X9_62_c2tnb239v1,
 271                 "2159633321041961198501834003903461262881815148684178964245"
 272                 "5876922391552",
 273                 "1970303740007316867383349976549972270528498040721988191026"
 274                 "49413465737174"))
 275                 goto x962_err;
 276
 277         ret = 1;
 278 x962_err:
 279         if (!restore_rand())
 280                 ret = 0;
 281         return ret;
 282         }
 283
 284 int test_builtin(BIO *out)
 285         {
 286         EC_builtin_curve *curves = NULL;
 287         size_t          crv_len = 0, n = 0;
 288         EC_KEY          *eckey = NULL, *wrong_eckey = NULL;
 289         EC_GROUP        *group;
 290         unsigned char   digest[20], wrong_digest[20];
 291         unsigned char   *signature = NULL;
 292         unsigned int    sig_len;
 293         int             nid, ret =  0;
 294
 295         /* fill digest values with some random data */
 296         if (!RAND_pseudo_bytes(digest, 20) ||
 297             !RAND_pseudo_bytes(wrong_digest, 20))
 298                 {
 299                 BIO_printf(out, "ERROR: unable to get random data\n");
 300                 goto builtin_err;
 301                 }
 302
 303         /* create and verify a ecdsa signature with every availble curve
 304          * (with ) */
 305         BIO_printf(out, "\ntesting ECDSA_sign() and ECDSA_verify() "
 306                 "with some internal curves:\n");
 307
 308         /* get a list of all internal curves */
 309         crv_len = EC_get_builtin_curves(NULL, 0);
 310
 311         curves = OPENSSL_malloc(sizeof(EC_builtin_curve) * crv_len);
 312
 313         if (curves == NULL)
 314                 {
 315                 BIO_printf(out, "malloc error\n");
 316                 goto builtin_err;
 317                 }
 318
 319         if (!EC_get_builtin_curves(curves, crv_len))
 320                 {
 321                 BIO_printf(out, "unable to get internal curves\n");
 322                 goto builtin_err;
 323                 }
 324
 325         /* now create and verify a signature for every curve */
 326         for (n = 0; n < crv_len; n++)
 327                 {
 328                 unsigned char dirt, offset;
 329
 330                 nid = curves[n].nid;
 331                 if (nid == NID_ipsec4)
 332                         continue;
 333                 /* create new ecdsa key (== EC_KEY) */
 334                 if ((eckey = EC_KEY_new()) == NULL)
 335                         goto builtin_err;
 336                 group = EC_GROUP_new_by_curve_name(nid);
 337                 if (group == NULL)
 338                         goto builtin_err;
 339                 if (EC_KEY_set_group(eckey, group) == 0)
 340                         goto builtin_err;
 341                 EC_GROUP_free(group);
 342                 if (EC_GROUP_get_degree(EC_KEY_get0_group(eckey)) < 160)
 343                         /* drop the curve */
 344                         {
 345                         EC_KEY_free(eckey);
 346                         eckey = NULL;
 347                         continue;
 348                         }
 349                 BIO_printf(out, "%s: ", OBJ_nid2sn(nid));
 350                 /* create key */
 351                 if (!EC_KEY_generate_key(eckey))
 352                         {
 353                         BIO_printf(out, " failed\n");
 354                         goto builtin_err;
 355                         }
 356                 /* create second key */
 357                 if ((wrong_eckey = EC_KEY_new()) == NULL)
 358                         goto builtin_err;
 359                 group = EC_GROUP_new_by_curve_name(nid);
 360                 if (group == NULL)
 361                         goto builtin_err;
 362                 if (EC_KEY_set_group(wrong_eckey, group) == 0)
 363                         goto builtin_err;
 364                 EC_GROUP_free(group);
 365                 if (!EC_KEY_generate_key(wrong_eckey))
 366                         {
 367                         BIO_printf(out, " failed\n");
 368                         goto builtin_err;
 369                         }
 370
 371                 BIO_printf(out, ".");
 372                 (void)BIO_flush(out);
 373                 /* check key */
 374                 if (!EC_KEY_check_key(eckey))
 375                         {
 376                         BIO_printf(out, " failed\n");
 377                         goto builtin_err;
 378                         }
 379                 BIO_printf(out, ".");
 380                 (void)BIO_flush(out);
 381                 /* create signature */
 382                 sig_len = ECDSA_size(eckey);
 383                 if ((signature = OPENSSL_malloc(sig_len)) == NULL)
 384                         goto builtin_err;
 385                 if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey))
 386                         {
 387                         BIO_printf(out, " failed\n");
 388                         goto builtin_err;
 389                         }
 390                 BIO_printf(out, ".");
 391                 (void)BIO_flush(out);
 392                 /* verify signature */
 393                 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1)
 394                         {
 395                         BIO_printf(out, " failed\n");
 396                         goto builtin_err;
 397                         }
 398                 BIO_printf(out, ".");
 399                 (void)BIO_flush(out);
 400                 /* verify signature with the wrong key */
 401                 if (ECDSA_verify(0, digest, 20, signature, sig_len,
 402                         wrong_eckey) == 1)
 403                         {
 404                         BIO_printf(out, " failed\n");
 405                         goto builtin_err;
 406                         }
 407                 BIO_printf(out, ".");
 408                 (void)BIO_flush(out);
 409                 /* wrong digest */
 410                 if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len,
 411                         eckey) == 1)
 412                         {
 413                         BIO_printf(out, " failed\n");
 414                         goto builtin_err;
 415                         }
 416                 BIO_printf(out, ".");
 417                 (void)BIO_flush(out);
 418                 /* modify a single byte of the signature */
 419                 offset = signature[10] % sig_len;
 420                 dirt   = signature[11];
 421                 signature[offset] ^= dirt ? dirt : 1;
 422                 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1)
 423                         {
 424                         BIO_printf(out, " failed\n");
 425                         goto builtin_err;
 426                         }
 427                 BIO_printf(out, ".");
 428                 (void)BIO_flush(out);
 429
 430                 BIO_printf(out, " ok\n");
 431                 /* cleanup */
 432                 OPENSSL_free(signature);
 433                 signature = NULL;
 434                 EC_KEY_free(eckey);
 435                 eckey = NULL;
 436                 EC_KEY_free(wrong_eckey);
 437                 wrong_eckey = NULL;
 438                 }
 439
 440         ret = 1;
 441 builtin_err:
 442         if (eckey)
 443                 EC_KEY_free(eckey);
 444         if (wrong_eckey)
 445                 EC_KEY_free(wrong_eckey);
 446         if (signature)
 447                 OPENSSL_free(signature);
 448         if (curves)
 449                 OPENSSL_free(curves);
 450
 451         return ret;
 452         }
 453
 454 int main(void)
 455         {
 456         int     ret = 1;
 457         BIO     *out;
 458
 459         out = BIO_new_fp(stdout, BIO_NOCLOSE);
 460
 461         /* enable memory leak checking unless explicitly disabled */
 462         if (!((getenv("OPENSSL_DEBUG_MEMORY") != NULL) &&
 463                 (0 == strcmp(getenv("OPENSSL_DEBUG_MEMORY"), "off"))))
 464                 {
 465                 CRYPTO_malloc_debug_init();
 466                 CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL);
 467                 }
 468         else
 469                 {
 470                 /* OPENSSL_DEBUG_MEMORY=off */
 471                 CRYPTO_set_mem_debug_functions(0, 0, 0, 0, 0);
 472                 }
 473         CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
 474
 475         ERR_load_crypto_strings();
 476
 477         /* initialize the prng */
 478         RAND_seed(rnd_seed, sizeof(rnd_seed));
 479
 480         /* the tests */
 481         if (!x9_62_tests(out))  goto err;
 482         if (!test_builtin(out)) goto err;
 483
 484         ret = 0;
 485 err:
 486         if (ret)
 487                 BIO_printf(out, "\nECDSA test failed\n");
 488         else
 489                 BIO_printf(out, "\nECDSA test passed\n");
 490         if (ret)
 491                 ERR_print_errors(out);
 492         CRYPTO_cleanup_all_ex_data();
 493         ERR_remove_state(0);
 494         ERR_free_strings();
 495         CRYPTO_mem_leaks(out);
 496         if (out != NULL)
 497                 BIO_free(out);
 498         return ret;
 499         }
 500 #endif