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
 156 int fbytes(unsigned char *buf, int num)
 157 {
 158     int ret;
 159     BIGNUM *tmp = NULL;
 160
 161     if (fbytes_counter >= 8)
 162         return 0;
 163     tmp = BN_new();
 164     if (!tmp)
 165         return 0;
 166     if (!BN_dec2bn(&tmp, numbers[fbytes_counter])) {
 167         BN_free(tmp);
 168         return 0;
 169     }
 170     fbytes_counter++;
 171     if (num != BN_num_bytes(tmp) || !BN_bn2bin(tmp, buf))
 172         ret = 0;
 173     else
 174         ret = 1;
 175     if (tmp)
 176         BN_free(tmp);
 177     return ret;
 178 }
 179
 180 /* some tests from the X9.62 draft */
 181 int x9_62_test_internal(BIO *out, int nid, const char *r_in, const char *s_in)
 182 {
 183     int ret = 0;
 184     const char message[] = "abc";
 185     unsigned char digest[20];
 186     unsigned int dgst_len = 0;
 187     EVP_MD_CTX md_ctx;
 188     EC_KEY *key = NULL;
 189     ECDSA_SIG *signature = NULL;
 190     BIGNUM *r = NULL, *s = NULL;
 191
 192     EVP_MD_CTX_init(&md_ctx);
 193     /* get the message digest */
 194     EVP_DigestInit(&md_ctx, EVP_ecdsa());
 195     EVP_DigestUpdate(&md_ctx, (const void *)message, 3);
 196     EVP_DigestFinal(&md_ctx, digest, &dgst_len);
 197
 198     BIO_printf(out, "testing %s: ", OBJ_nid2sn(nid));
 199     /* create the key */
 200     if ((key = EC_KEY_new_by_curve_name(nid)) == NULL)
 201         goto x962_int_err;
 202     if (!EC_KEY_generate_key(key))
 203         goto x962_int_err;
 204     BIO_printf(out, ".");
 205     (void)BIO_flush(out);
 206     /* create the signature */
 207     signature = ECDSA_do_sign(digest, 20, key);
 208     if (signature == NULL)
 209         goto x962_int_err;
 210     BIO_printf(out, ".");
 211     (void)BIO_flush(out);
 212     /* compare the created signature with the expected signature */
 213     if ((r = BN_new()) == NULL || (s = BN_new()) == NULL)
 214         goto x962_int_err;
 215     if (!BN_dec2bn(&r, r_in) || !BN_dec2bn(&s, s_in))
 216         goto x962_int_err;
 217     if (BN_cmp(signature->r, r) || BN_cmp(signature->s, s))
 218         goto x962_int_err;
 219     BIO_printf(out, ".");
 220     (void)BIO_flush(out);
 221     /* verify the signature */
 222     if (ECDSA_do_verify(digest, 20, signature, key) != 1)
 223         goto x962_int_err;
 224     BIO_printf(out, ".");
 225     (void)BIO_flush(out);
 226
 227     BIO_printf(out, " ok\n");
 228     ret = 1;
 229  x962_int_err:
 230     if (!ret)
 231         BIO_printf(out, " failed\n");
 232     if (key)
 233         EC_KEY_free(key);
 234     if (signature)
 235         ECDSA_SIG_free(signature);
 236     if (r)
 237         BN_free(r);
 238     if (s)
 239         BN_free(s);
 240     EVP_MD_CTX_cleanup(&md_ctx);
 241     return ret;
 242 }
 243
 244 int x9_62_tests(BIO *out)
 245 {
 246     int ret = 0;
 247
 248     BIO_printf(out, "some tests from X9.62:\n");
 249
 250     /* set own rand method */
 251     if (!change_rand())
 252         goto x962_err;
 253
 254     if (!x9_62_test_internal(out, NID_X9_62_prime192v1,
 255                              "3342403536405981729393488334694600415596881826869351677613",
 256                              "5735822328888155254683894997897571951568553642892029982342"))
 257         goto x962_err;
 258     if (!x9_62_test_internal(out, NID_X9_62_prime239v1,
 259                              "3086361431751678114926225473006680188549593787585317781474"
 260                              "62058306432176",
 261                              "3238135532097973577080787768312505059318910517550078427819"
 262                              "78505179448783"))
 263         goto x962_err;
 264     if (!x9_62_test_internal(out, NID_X9_62_c2tnb191v1,
 265                              "87194383164871543355722284926904419997237591535066528048",
 266                              "308992691965804947361541664549085895292153777025772063598"))
 267         goto x962_err;
 268     if (!x9_62_test_internal(out, NID_X9_62_c2tnb239v1,
 269                              "2159633321041961198501834003903461262881815148684178964245"
 270                              "5876922391552",
 271                              "1970303740007316867383349976549972270528498040721988191026"
 272                              "49413465737174"))
 273         goto x962_err;
 274
 275     ret = 1;
 276  x962_err:
 277     if (!restore_rand())
 278         ret = 0;
 279     return ret;
 280 }
 281
 282 int test_builtin(BIO *out)
 283 {
 284     EC_builtin_curve *curves = NULL;
 285     size_t crv_len = 0, n = 0;
 286     EC_KEY *eckey = NULL, *wrong_eckey = NULL;
 287     EC_GROUP *group;
 288     ECDSA_SIG *ecdsa_sig = NULL;
 289     unsigned char digest[20], wrong_digest[20];
 290     unsigned char *signature = NULL;
 291     const unsigned char *sig_ptr;
 292     unsigned char *sig_ptr2;
 293     unsigned char *raw_buf = NULL;
 294     unsigned int sig_len, degree, r_len, s_len, bn_len, buf_len;
 295     int nid, ret = 0;
 296
 297     /* fill digest values with some random data */
 298     if (!RAND_pseudo_bytes(digest, 20) ||
 299         !RAND_pseudo_bytes(wrong_digest, 20)) {
 300         BIO_printf(out, "ERROR: unable to get random data\n");
 301         goto builtin_err;
 302     }
 303
 304     /*
 305      * create and verify a ecdsa signature with every availble curve (with )
 306      */
 307     BIO_printf(out, "\ntesting ECDSA_sign() and ECDSA_verify() "
 308                "with some internal curves:\n");
 309
 310     /* get a list of all internal curves */
 311     crv_len = EC_get_builtin_curves(NULL, 0);
 312
 313     curves = OPENSSL_malloc(sizeof(EC_builtin_curve) * crv_len);
 314
 315     if (curves == NULL) {
 316         BIO_printf(out, "malloc error\n");
 317         goto builtin_err;
 318     }
 319
 320     if (!EC_get_builtin_curves(curves, crv_len)) {
 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         unsigned char dirt, offset;
 328
 329         nid = curves[n].nid;
 330         if (nid == NID_ipsec4)
 331             continue;
 332         /* create new ecdsa key (== EC_KEY) */
 333         if ((eckey = EC_KEY_new()) == NULL)
 334             goto builtin_err;
 335         group = EC_GROUP_new_by_curve_name(nid);
 336         if (group == NULL)
 337             goto builtin_err;
 338         if (EC_KEY_set_group(eckey, group) == 0)
 339             goto builtin_err;
 340         EC_GROUP_free(group);
 341         degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey));
 342         if (degree < 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             BIO_printf(out, " failed\n");
 353             goto builtin_err;
 354         }
 355         /* create second key */
 356         if ((wrong_eckey = EC_KEY_new()) == NULL)
 357             goto builtin_err;
 358         group = EC_GROUP_new_by_curve_name(nid);
 359         if (group == NULL)
 360             goto builtin_err;
 361         if (EC_KEY_set_group(wrong_eckey, group) == 0)
 362             goto builtin_err;
 363         EC_GROUP_free(group);
 364         if (!EC_KEY_generate_key(wrong_eckey)) {
 365             BIO_printf(out, " failed\n");
 366             goto builtin_err;
 367         }
 368
 369         BIO_printf(out, ".");
 370         (void)BIO_flush(out);
 371         /* check key */
 372         if (!EC_KEY_check_key(eckey)) {
 373             BIO_printf(out, " failed\n");
 374             goto builtin_err;
 375         }
 376         BIO_printf(out, ".");
 377         (void)BIO_flush(out);
 378         /* create signature */
 379         sig_len = ECDSA_size(eckey);
 380         if ((signature = OPENSSL_malloc(sig_len)) == NULL)
 381             goto builtin_err;
 382         if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey)) {
 383             BIO_printf(out, " failed\n");
 384             goto builtin_err;
 385         }
 386         BIO_printf(out, ".");
 387         (void)BIO_flush(out);
 388         /* verify signature */
 389         if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) {
 390             BIO_printf(out, " failed\n");
 391             goto builtin_err;
 392         }
 393         BIO_printf(out, ".");
 394         (void)BIO_flush(out);
 395         /* verify signature with the wrong key */
 396         if (ECDSA_verify(0, digest, 20, signature, sig_len, wrong_eckey) == 1) {
 397             BIO_printf(out, " failed\n");
 398             goto builtin_err;
 399         }
 400         BIO_printf(out, ".");
 401         (void)BIO_flush(out);
 402         /* wrong digest */
 403         if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len, eckey) == 1) {
 404             BIO_printf(out, " failed\n");
 405             goto builtin_err;
 406         }
 407         BIO_printf(out, ".");
 408         (void)BIO_flush(out);
 409         /* wrong length */
 410         if (ECDSA_verify(0, digest, 20, signature, sig_len - 1, eckey) == 1) {
 411             BIO_printf(out, " failed\n");
 412             goto builtin_err;
 413         }
 414         BIO_printf(out, ".");
 415         (void)BIO_flush(out);
 416
 417         /*
 418          * Modify a single byte of the signature: to ensure we don't garble
 419          * the ASN1 structure, we read the raw signature and modify a byte in
 420          * one of the bignums directly.
 421          */
 422         sig_ptr = signature;
 423         if ((ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)) == NULL) {
 424             BIO_printf(out, " failed\n");
 425             goto builtin_err;
 426         }
 427
 428         /* Store the two BIGNUMs in raw_buf. */
 429         r_len = BN_num_bytes(ecdsa_sig->r);
 430         s_len = BN_num_bytes(ecdsa_sig->s);
 431         bn_len = (degree + 7) / 8;
 432         if ((r_len > bn_len) || (s_len > bn_len)) {
 433             BIO_printf(out, " failed\n");
 434             goto builtin_err;
 435         }
 436         buf_len = 2 * bn_len;
 437         if ((raw_buf = OPENSSL_malloc(buf_len)) == NULL)
 438             goto builtin_err;
 439         /* Pad the bignums with leading zeroes. */
 440         memset(raw_buf, 0, buf_len);
 441         BN_bn2bin(ecdsa_sig->r, raw_buf + bn_len - r_len);
 442         BN_bn2bin(ecdsa_sig->s, raw_buf + buf_len - s_len);
 443
 444         /* Modify a single byte in the buffer. */
 445         offset = raw_buf[10] % buf_len;
 446         dirt = raw_buf[11] ? raw_buf[11] : 1;
 447         raw_buf[offset] ^= dirt;
 448         /* Now read the BIGNUMs back in from raw_buf. */
 449         if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) ||
 450             (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL))
 451             goto builtin_err;
 452
 453         sig_ptr2 = signature;
 454         sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2);
 455         if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1) {
 456             BIO_printf(out, " failed\n");
 457             goto builtin_err;
 458         }
 459         /*
 460          * Sanity check: undo the modification and verify signature.
 461          */
 462         raw_buf[offset] ^= dirt;
 463         if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) ||
 464             (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL))
 465             goto builtin_err;
 466
 467         sig_ptr2 = signature;
 468         sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2);
 469         if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) {
 470             BIO_printf(out, " failed\n");
 471             goto builtin_err;
 472         }
 473         BIO_printf(out, ".");
 474         (void)BIO_flush(out);
 475
 476         BIO_printf(out, " ok\n");
 477         /* cleanup */
 478         /* clean bogus errors */
 479         ERR_clear_error();
 480         OPENSSL_free(signature);
 481         signature = NULL;
 482         EC_KEY_free(eckey);
 483         eckey = NULL;
 484         EC_KEY_free(wrong_eckey);
 485         wrong_eckey = NULL;
 486         ECDSA_SIG_free(ecdsa_sig);
 487         ecdsa_sig = NULL;
 488         OPENSSL_free(raw_buf);
 489         raw_buf = NULL;
 490     }
 491
 492     ret = 1;
 493  builtin_err:
 494     if (eckey)
 495         EC_KEY_free(eckey);
 496     if (wrong_eckey)
 497         EC_KEY_free(wrong_eckey);
 498     if (ecdsa_sig)
 499         ECDSA_SIG_free(ecdsa_sig);
 500     if (signature)
 501         OPENSSL_free(signature);
 502     if (raw_buf)
 503         OPENSSL_free(raw_buf);
 504     if (curves)
 505         OPENSSL_free(curves);
 506
 507     return ret;
 508 }
 509
 510 int main(void)
 511 {
 512     int ret = 1;
 513     BIO *out;
 514
 515     out = BIO_new_fp(stdout, BIO_NOCLOSE);
 516
 517     /* enable memory leak checking unless explicitly disabled */
 518     if (!((getenv("OPENSSL_DEBUG_MEMORY") != NULL) &&
 519           (0 == strcmp(getenv("OPENSSL_DEBUG_MEMORY"), "off")))) {
 520         CRYPTO_malloc_debug_init();
 521         CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL);
 522     } else {
 523         /* OPENSSL_DEBUG_MEMORY=off */
 524         CRYPTO_set_mem_debug_functions(0, 0, 0, 0, 0);
 525     }
 526     CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
 527
 528     ERR_load_crypto_strings();
 529
 530     /* initialize the prng */
 531     RAND_seed(rnd_seed, sizeof(rnd_seed));
 532
 533     /* the tests */
 534     if (!x9_62_tests(out))
 535         goto err;
 536     if (!test_builtin(out))
 537         goto err;
 538
 539     ret = 0;
 540  err:
 541     if (ret)
 542         BIO_printf(out, "\nECDSA test failed\n");
 543     else
 544         BIO_printf(out, "\nECDSA test passed\n");
 545     if (ret)
 546         ERR_print_errors(out);
 547     CRYPTO_cleanup_all_ex_data();
 548     ERR_remove_state(0);
 549     ERR_free_strings();
 550     CRYPTO_mem_leaks(out);
 551     if (out != NULL)
 552         BIO_free(out);
 553     return ret;
 554 }
 555 #endif