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 /* Until the key-gen callbacks are modified to use newer prototypes, we allow
  73  * deprecated functions for openssl-internal code */
  74 #ifdef OPENSSL_NO_DEPRECATED
  75 #undef OPENSSL_NO_DEPRECATED
  76 #endif
  77
  78 #include <stdio.h>
  79 #include <stdlib.h>
  80 #include <string.h>
  81
  82 #include <openssl/opensslconf.h> /* To see if OPENSSL_NO_ECDSA is defined */
  83
  84 #ifdef OPENSSL_NO_ECDSA
  85 int main(int argc, char * argv[])
  86         {
  87         puts("Elliptic curves are disabled.");
  88         return 0;
  89         }
  90 #else
  91
  92 #include <openssl/crypto.h>
  93 #include <openssl/bio.h>
  94 #include <openssl/evp.h>
  95 #include <openssl/ecdsa.h>
  96 #include <openssl/engine.h>
  97 #include <openssl/err.h>
  98 #include <openssl/rand.h>
  99
 100 static const char rnd_seed[] = "string to make the random number generator "
 101         "think it has entropy";
 102
 103 /* declaration of the test functions */
 104 int x9_62_tests(BIO *);
 105 int x9_62_test_internal(BIO *out, int nid, const char *r, const char *s);
 106 int test_builtin(BIO *);
 107
 108 /* functions to change the RAND_METHOD */
 109 int change_rand(void);
 110 int restore_rand(void);
 111 int fbytes(unsigned char *buf, int num);
 112
 113 RAND_METHOD     fake_rand;
 114 const RAND_METHOD *old_rand;
 115
 116 int change_rand(void)
 117         {
 118         /* save old rand method */
 119         if ((old_rand = RAND_get_rand_method()) == NULL)
 120                 return 0;
 121
 122         fake_rand.seed    = old_rand->seed;
 123         fake_rand.cleanup = old_rand->cleanup;
 124         fake_rand.add     = old_rand->add;
 125         fake_rand.status  = old_rand->status;
 126         /* use own random function */
 127         fake_rand.bytes      = fbytes;
 128         fake_rand.pseudorand = old_rand->bytes;
 129         /* set new RAND_METHOD */
 130         if (!RAND_set_rand_method(&fake_rand))
 131                 return 0;
 132         return 1;
 133         }
 134
 135 int restore_rand(void)
 136         {
 137         if (!RAND_set_rand_method(old_rand))
 138                 return 0;
 139         else
 140                 return 1;
 141         }
 142
 143 static int fbytes_counter = 0;
 144 static const char *numbers[8] = {
 145         "651056770906015076056810763456358567190100156695615665659",
 146         "6140507067065001063065065565667405560006161556565665656654",
 147         "8763001015071075675010661307616710783570106710677817767166"
 148         "71676178726717",
 149         "7000000175690566466555057817571571075705015757757057795755"
 150         "55657156756655",
 151         "1275552191113212300012030439187146164646146646466749494799",
 152         "1542725565216523985789236956265265265235675811949404040041",
 153         "1456427555219115346513212300075341203043918714616464614664"
 154         "64667494947990",
 155         "1712787255652165239672857892369562652652652356758119494040"
 156         "40041670216363"};
 157
 158 int fbytes(unsigned char *buf, int num)
 159         {
 160         int     ret;
 161         BIGNUM  *tmp = NULL;
 162
 163         if (fbytes_counter >= 8)
 164                 return 0;
 165         tmp = BN_new();
 166         if (!tmp)
 167                 return 0;
 168         if (!BN_dec2bn(&tmp, numbers[fbytes_counter]))
 169                 {
 170                 BN_free(tmp);
 171                 return 0;
 172                 }
 173         fbytes_counter ++;
 174         ret = BN_bn2bin(tmp, buf);
 175         if (ret == 0 || ret != num)
 176                 ret = 0;
 177         else
 178                 ret = 1;
 179         if (tmp)
 180                 BN_free(tmp);
 181         return ret;
 182         }
 183
 184 /* some tests from the X9.62 draft */
 185 int x9_62_test_internal(BIO *out, int nid, const char *r_in, const char *s_in)
 186         {
 187         int     ret = 0;
 188         const char message[] = "abc";
 189         unsigned char digest[20];
 190         unsigned int  dgst_len = 0;
 191         EVP_MD_CTX md_ctx;
 192         EC_KEY    *key = NULL;
 193         ECDSA_SIG *signature = NULL;
 194         BIGNUM    *r = NULL, *s = NULL;
 195
 196         EVP_MD_CTX_init(&md_ctx);
 197         /* get the message digest */
 198         EVP_DigestInit(&md_ctx, EVP_ecdsa());
 199         EVP_DigestUpdate(&md_ctx, (const void*)message, 3);
 200         EVP_DigestFinal(&md_ctx, digest, &dgst_len);
 201
 202         BIO_printf(out, "testing %s: ", OBJ_nid2sn(nid));
 203         /* create the key */
 204         if ((key = EC_KEY_new_by_curve_name(nid)) == NULL)
 205                 goto x962_int_err;
 206         if (!EC_KEY_generate_key(key))
 207                 goto x962_int_err;
 208         BIO_printf(out, ".");
 209         BIO_flush(out);
 210         /* create the signature */
 211         signature = ECDSA_do_sign(digest, 20, key);
 212         if (signature == NULL)
 213                 goto x962_int_err;
 214         BIO_printf(out, ".");
 215         BIO_flush(out);
 216         /* compare the created signature with the expected signature */
 217         if ((r = BN_new()) == NULL || (s = BN_new()) == NULL)
 218                 goto x962_int_err;
 219         if (!BN_dec2bn(&r, r_in) ||
 220             !BN_dec2bn(&s, s_in))
 221                 goto x962_int_err;
 222         if (BN_cmp(signature->r ,r) || BN_cmp(signature->s, s))
 223                 goto x962_int_err;
 224         BIO_printf(out, ".");
 225         BIO_flush(out);
 226         /* verify the signature */
 227         if (ECDSA_do_verify(digest, 20, signature, key) != 1)
 228                 goto x962_int_err;
 229         BIO_printf(out, ".");
 230         BIO_flush(out);
 231
 232         BIO_printf(out, " ok\n");
 233         ret = 1;
 234 x962_int_err:
 235         if (!ret)
 236                 BIO_printf(out, " failed\n");
 237         if (key)
 238                 EC_KEY_free(key);
 239         if (signature)
 240                 ECDSA_SIG_free(signature);
 241         if (r)
 242                 BN_free(r);
 243         if (s)
 244                 BN_free(s);
 245         EVP_MD_CTX_cleanup(&md_ctx);
 246         return ret;
 247         }
 248
 249 int x9_62_tests(BIO *out)
 250         {
 251         int ret = 0;
 252
 253         BIO_printf(out, "some tests from X9.62:\n");
 254
 255         /* set own rand method */
 256         if (!change_rand())
 257                 goto x962_err;
 258
 259         if (!x9_62_test_internal(out, NID_X9_62_prime192v1,
 260                 "3342403536405981729393488334694600415596881826869351677613",
 261                 "5735822328888155254683894997897571951568553642892029982342"))
 262                 goto x962_err;
 263         if (!x9_62_test_internal(out, NID_X9_62_prime239v1,
 264                 "3086361431751678114926225473006680188549593787585317781474"
 265                 "62058306432176",
 266                 "3238135532097973577080787768312505059318910517550078427819"
 267                 "78505179448783"))
 268                 goto x962_err;
 269         if (!x9_62_test_internal(out, NID_X9_62_c2tnb191v1,
 270                 "87194383164871543355722284926904419997237591535066528048",
 271                 "308992691965804947361541664549085895292153777025772063598"))
 272                 goto x962_err;
 273         if (!x9_62_test_internal(out, NID_X9_62_c2tnb239v1,
 274                 "2159633321041961198501834003903461262881815148684178964245"
 275                 "5876922391552",
 276                 "1970303740007316867383349976549972270528498040721988191026"
 277                 "49413465737174"))
 278                 goto x962_err;
 279
 280         ret = 1;
 281 x962_err:
 282         if (!restore_rand())
 283                 ret = 0;
 284         return ret;
 285         }
 286
 287 int test_builtin(BIO *out)
 288         {
 289         EC_builtin_curve *curves = NULL;
 290         size_t          crv_len = 0, n = 0;
 291         EC_KEY          *eckey = NULL, *wrong_eckey = NULL;
 292         EC_GROUP        *group;
 293         unsigned char   digest[20], wrong_digest[20];
 294         unsigned char   *signature = NULL;
 295         unsigned int    sig_len;
 296         int             nid, ret =  0;
 297
 298         /* fill digest values with some random data */
 299         if (!RAND_pseudo_bytes(digest, 20) ||
 300             !RAND_pseudo_bytes(wrong_digest, 20))
 301                 {
 302                 BIO_printf(out, "ERROR: unable to get random data\n");
 303                 goto builtin_err;
 304                 }
 305
 306         /* create and verify a ecdsa signature with every availble curve
 307          * (with ) */
 308         BIO_printf(out, "\ntesting ECDSA_sign() and ECDSA_verify() "
 309                 "with some internal curves:\n");
 310
 311         /* get a list of all internal curves */
 312         crv_len = EC_get_builtin_curves(NULL, 0);
 313
 314         curves = OPENSSL_malloc(sizeof(EC_builtin_curve) * crv_len);
 315
 316         if (curves == NULL)
 317                 {
 318                 BIO_printf(out, "malloc error\n");
 319                 goto builtin_err;
 320                 }
 321
 322         if (!EC_get_builtin_curves(curves, crv_len))
 323                 {
 324                 BIO_printf(out, "unable to get internal curves\n");
 325                 goto builtin_err;
 326                 }
 327
 328         /* now create and verify a signature for every curve */
 329         for (n = 0; n < crv_len; n++)
 330                 {
 331                 unsigned char dirt, offset;
 332
 333                 nid = curves[n].nid;
 334                 if (nid == NID_ipsec4)
 335                         continue;
 336                 /* create new ecdsa key (== EC_KEY) */
 337                 if ((eckey = EC_KEY_new()) == NULL)
 338                         goto builtin_err;
 339                 group = EC_GROUP_new_by_curve_name(nid);
 340                 if (group == NULL)
 341                         goto builtin_err;
 342                 if (EC_KEY_set_group(eckey, group) == 0)
 343                         goto builtin_err;
 344                 EC_GROUP_free(group);
 345                 if (EC_GROUP_get_degree(EC_KEY_get0_group(eckey)) < 160)
 346                         /* drop the curve */
 347                         {
 348                         EC_KEY_free(eckey);
 349                         eckey = NULL;
 350                         continue;
 351                         }
 352                 BIO_printf(out, "%s: ", OBJ_nid2sn(nid));
 353                 /* create key */
 354                 if (!EC_KEY_generate_key(eckey))
 355                         {
 356                         BIO_printf(out, " failed\n");
 357                         goto builtin_err;
 358                         }
 359                 /* create second key */
 360                 if ((wrong_eckey = EC_KEY_new()) == NULL)
 361                         goto builtin_err;
 362                 group = EC_GROUP_new_by_curve_name(nid);
 363                 if (group == NULL)
 364                         goto builtin_err;
 365                 if (EC_KEY_set_group(wrong_eckey, group) == 0)
 366                         goto builtin_err;
 367                 EC_GROUP_free(group);
 368                 if (!EC_KEY_generate_key(wrong_eckey))
 369                         {
 370                         BIO_printf(out, " failed\n");
 371                         goto builtin_err;
 372                         }
 373
 374                 BIO_printf(out, ".");
 375                 BIO_flush(out);
 376                 /* check key */
 377                 if (!EC_KEY_check_key(eckey))
 378                         {
 379                         BIO_printf(out, " failed\n");
 380                         goto builtin_err;
 381                         }
 382                 BIO_printf(out, ".");
 383                 BIO_flush(out);
 384                 /* create signature */
 385                 sig_len = ECDSA_size(eckey);
 386                 if ((signature = OPENSSL_malloc(sig_len)) == NULL)
 387                         goto builtin_err;
 388                 if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey))
 389                         {
 390                         BIO_printf(out, " failed\n");
 391                         goto builtin_err;
 392                         }
 393                 BIO_printf(out, ".");
 394                 BIO_flush(out);
 395                 /* verify signature */
 396                 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1)
 397                         {
 398                         BIO_printf(out, " failed\n");
 399                         goto builtin_err;
 400                         }
 401                 BIO_printf(out, ".");
 402                 BIO_flush(out);
 403                 /* verify signature with the wrong key */
 404                 if (ECDSA_verify(0, digest, 20, signature, sig_len,
 405                         wrong_eckey) == 1)
 406                         {
 407                         BIO_printf(out, " failed\n");
 408                         goto builtin_err;
 409                         }
 410                 BIO_printf(out, ".");
 411                 BIO_flush(out);
 412                 /* wrong digest */
 413                 if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len,
 414                         eckey) == 1)
 415                         {
 416                         BIO_printf(out, " failed\n");
 417                         goto builtin_err;
 418                         }
 419                 BIO_printf(out, ".");
 420                 BIO_flush(out);
 421                 /* modify a single byte of the signature */
 422                 offset = signature[10] % sig_len;
 423                 dirt   = signature[11];
 424                 signature[offset] ^= dirt ? dirt : 1;
 425                 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1)
 426                         {
 427                         BIO_printf(out, " failed\n");
 428                         goto builtin_err;
 429                         }
 430                 BIO_printf(out, ".");
 431                 BIO_flush(out);
 432
 433                 BIO_printf(out, " ok\n");
 434                 /* cleanup */
 435                 OPENSSL_free(signature);
 436                 signature = NULL;
 437                 EC_KEY_free(eckey);
 438                 eckey = NULL;
 439                 EC_KEY_free(wrong_eckey);
 440                 wrong_eckey = NULL;
 441                 }
 442
 443         ret = 1;
 444 builtin_err:
 445         if (eckey)
 446                 EC_KEY_free(eckey);
 447         if (wrong_eckey)
 448                 EC_KEY_free(wrong_eckey);
 449         if (signature);
 450                 OPENSSL_free(signature);
 451         if (curves)
 452                 OPENSSL_free(curves);
 453
 454         return ret;
 455         }
 456
 457 int main(void)
 458         {
 459         int     ret = 1;
 460         BIO     *out;
 461
 462         out = BIO_new_fp(stdout, BIO_NOCLOSE);
 463
 464         /* enable memory leak checking unless explicitly disabled */
 465         if (!((getenv("OPENSSL_DEBUG_MEMORY") != NULL) &&
 466                 (0 == strcmp(getenv("OPENSSL_DEBUG_MEMORY"), "off"))))
 467                 {
 468                 CRYPTO_malloc_debug_init();
 469                 CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL);
 470                 }
 471         else
 472                 {
 473                 /* OPENSSL_DEBUG_MEMORY=off */
 474                 CRYPTO_set_mem_debug_functions(0, 0, 0, 0, 0);
 475                 }
 476         CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
 477
 478         ERR_load_crypto_strings();
 479
 480         /* initialize the prng */
 481         RAND_seed(rnd_seed, sizeof(rnd_seed));
 482
 483         /* the tests */
 484         if (!x9_62_tests(out))  goto err;
 485         if (!test_builtin(out)) goto err;
 486
 487         ret = 0;
 488 err:
 489         if (ret)
 490                 BIO_printf(out, "\nECDSA test failed\n");
 491         else
 492                 BIO_printf(out, "\nECDSA test passed\n");
 493         if (ret)
 494                 ERR_print_errors(out);
 495         CRYPTO_cleanup_all_ex_data();
 496         ERR_remove_state(0);
 497         ERR_free_strings();
 498         CRYPTO_mem_leaks(out);
 499         if (out != NULL)
 500                 BIO_free(out);
 501         return ret;
 502         }
 503 #endif