test/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_EC is defined */
  77
  78 #ifdef OPENSSL_NO_EC
  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
 156 int fbytes(unsigned char *buf, int num)
 157 {
 158     int ret;
 159     BIGNUM *tmp = NULL;
 160
 161     if (use_fake == 0)
 162         return old_rand->bytes(buf, num);
 163
 164     use_fake = 0;
 165
 166     if (fbytes_counter >= 8)
 167         return 0;
 168     tmp = BN_new();
 169     if (!tmp)
 170         return 0;
 171     if (!BN_dec2bn(&tmp, numbers[fbytes_counter])) {
 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     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     BIGNUM *kinv = NULL, *rp = 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     /* Use ECDSA_sign_setup to avoid use of ECDSA nonces */
 216     if (!ECDSA_sign_setup(key, NULL, &kinv, &rp))
 217         goto x962_int_err;
 218     signature = ECDSA_do_sign_ex(digest, 20, kinv, rp, key);
 219     if (signature == NULL)
 220         goto x962_int_err;
 221     BIO_printf(out, ".");
 222     (void)BIO_flush(out);
 223     /* compare the created signature with the expected signature */
 224     if ((r = BN_new()) == NULL || (s = BN_new()) == NULL)
 225         goto x962_int_err;
 226     if (!BN_dec2bn(&r, r_in) || !BN_dec2bn(&s, s_in))
 227         goto x962_int_err;
 228     if (BN_cmp(signature->r, r) || BN_cmp(signature->s, s))
 229         goto x962_int_err;
 230     BIO_printf(out, ".");
 231     (void)BIO_flush(out);
 232     /* verify the signature */
 233     if (ECDSA_do_verify(digest, 20, signature, key) != 1)
 234         goto x962_int_err;
 235     BIO_printf(out, ".");
 236     (void)BIO_flush(out);
 237
 238     BIO_printf(out, " ok\n");
 239     ret = 1;
 240  x962_int_err:
 241     if (!ret)
 242         BIO_printf(out, " failed\n");
 243     EC_KEY_free(key);
 244     if (signature)
 245         ECDSA_SIG_free(signature);
 246     BN_free(r);
 247     BN_free(s);
 248     EVP_MD_CTX_cleanup(&md_ctx);
 249     BN_clear_free(kinv);
 250     BN_clear_free(rp);
 251     return ret;
 252 }
 253
 254 int x9_62_tests(BIO *out)
 255 {
 256     int ret = 0;
 257
 258     BIO_printf(out, "some tests from X9.62:\n");
 259
 260     /* set own rand method */
 261     if (!change_rand())
 262         goto x962_err;
 263
 264     if (!x9_62_test_internal(out, NID_X9_62_prime192v1,
 265                              "3342403536405981729393488334694600415596881826869351677613",
 266                              "5735822328888155254683894997897571951568553642892029982342"))
 267         goto x962_err;
 268     if (!x9_62_test_internal(out, NID_X9_62_prime239v1,
 269                              "3086361431751678114926225473006680188549593787585317781474"
 270                              "62058306432176",
 271                              "3238135532097973577080787768312505059318910517550078427819"
 272                              "78505179448783"))
 273         goto x962_err;
 274 # ifndef OPENSSL_NO_EC2M
 275     if (!x9_62_test_internal(out, NID_X9_62_c2tnb191v1,
 276                              "87194383164871543355722284926904419997237591535066528048",
 277                              "308992691965804947361541664549085895292153777025772063598"))
 278         goto x962_err;
 279     if (!x9_62_test_internal(out, NID_X9_62_c2tnb239v1,
 280                              "2159633321041961198501834003903461262881815148684178964245"
 281                              "5876922391552",
 282                              "1970303740007316867383349976549972270528498040721988191026"
 283                              "49413465737174"))
 284         goto x962_err;
 285 # endif
 286     ret = 1;
 287  x962_err:
 288     if (!restore_rand())
 289         ret = 0;
 290     return ret;
 291 }
 292
 293 int test_builtin(BIO *out)
 294 {
 295     EC_builtin_curve *curves = NULL;
 296     size_t crv_len = 0, n = 0;
 297     EC_KEY *eckey = NULL, *wrong_eckey = NULL;
 298     EC_GROUP *group;
 299     ECDSA_SIG *ecdsa_sig = NULL;
 300     unsigned char digest[20], wrong_digest[20];
 301     unsigned char *signature = NULL;
 302     const unsigned char *sig_ptr;
 303     unsigned char *sig_ptr2;
 304     unsigned char *raw_buf = NULL;
 305     unsigned int sig_len, degree, r_len, s_len, bn_len, buf_len;
 306     int nid, ret = 0;
 307
 308     /* fill digest values with some random data */
 309     if (RAND_bytes(digest, 20) <= 0 || RAND_bytes(wrong_digest, 20) <= 0) {
 310         BIO_printf(out, "ERROR: unable to get random data\n");
 311         goto builtin_err;
 312     }
 313
 314     /*
 315      * create and verify a ecdsa signature with every availble curve (with )
 316      */
 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         BIO_printf(out, "malloc error\n");
 327         goto builtin_err;
 328     }
 329
 330     if (!EC_get_builtin_curves(curves, crv_len)) {
 331         BIO_printf(out, "unable to get internal curves\n");
 332         goto builtin_err;
 333     }
 334
 335     /* now create and verify a signature for every curve */
 336     for (n = 0; n < crv_len; n++) {
 337         unsigned char dirt, offset;
 338
 339         nid = curves[n].nid;
 340         if (nid == NID_ipsec4)
 341             continue;
 342         /* create new ecdsa key (== EC_KEY) */
 343         if ((eckey = EC_KEY_new()) == NULL)
 344             goto builtin_err;
 345         group = EC_GROUP_new_by_curve_name(nid);
 346         if (group == NULL)
 347             goto builtin_err;
 348         if (EC_KEY_set_group(eckey, group) == 0)
 349             goto builtin_err;
 350         EC_GROUP_free(group);
 351         degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey));
 352         if (degree < 160) {
 353             /* drop the curve */
 354             EC_KEY_free(eckey);
 355             eckey = NULL;
 356             continue;
 357         }
 358         BIO_printf(out, "%s: ", OBJ_nid2sn(nid));
 359         /* create key */
 360         if (!EC_KEY_generate_key(eckey)) {
 361             BIO_printf(out, " failed\n");
 362             goto builtin_err;
 363         }
 364         /* create second key */
 365         if ((wrong_eckey = EC_KEY_new()) == NULL)
 366             goto builtin_err;
 367         group = EC_GROUP_new_by_curve_name(nid);
 368         if (group == NULL)
 369             goto builtin_err;
 370         if (EC_KEY_set_group(wrong_eckey, group) == 0)
 371             goto builtin_err;
 372         EC_GROUP_free(group);
 373         if (!EC_KEY_generate_key(wrong_eckey)) {
 374             BIO_printf(out, " failed\n");
 375             goto builtin_err;
 376         }
 377
 378         BIO_printf(out, ".");
 379         (void)BIO_flush(out);
 380         /* check key */
 381         if (!EC_KEY_check_key(eckey)) {
 382             BIO_printf(out, " failed\n");
 383             goto builtin_err;
 384         }
 385         BIO_printf(out, ".");
 386         (void)BIO_flush(out);
 387         /* create signature */
 388         sig_len = ECDSA_size(eckey);
 389         if ((signature = OPENSSL_malloc(sig_len)) == NULL)
 390             goto builtin_err;
 391         if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey)) {
 392             BIO_printf(out, " failed\n");
 393             goto builtin_err;
 394         }
 395         BIO_printf(out, ".");
 396         (void)BIO_flush(out);
 397         /* verify signature */
 398         if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) {
 399             BIO_printf(out, " failed\n");
 400             goto builtin_err;
 401         }
 402         BIO_printf(out, ".");
 403         (void)BIO_flush(out);
 404         /* verify signature with the wrong key */
 405         if (ECDSA_verify(0, digest, 20, signature, sig_len, wrong_eckey) == 1) {
 406             BIO_printf(out, " failed\n");
 407             goto builtin_err;
 408         }
 409         BIO_printf(out, ".");
 410         (void)BIO_flush(out);
 411         /* wrong digest */
 412         if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len, eckey) == 1) {
 413             BIO_printf(out, " failed\n");
 414             goto builtin_err;
 415         }
 416         BIO_printf(out, ".");
 417         (void)BIO_flush(out);
 418         /* wrong length */
 419         if (ECDSA_verify(0, digest, 20, signature, sig_len - 1, eckey) == 1) {
 420             BIO_printf(out, " failed\n");
 421             goto builtin_err;
 422         }
 423         BIO_printf(out, ".");
 424         (void)BIO_flush(out);
 425
 426         /*
 427          * Modify a single byte of the signature: to ensure we don't garble
 428          * the ASN1 structure, we read the raw signature and modify a byte in
 429          * one of the bignums directly.
 430          */
 431         sig_ptr = signature;
 432         if ((ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)) == NULL) {
 433             BIO_printf(out, " failed\n");
 434             goto builtin_err;
 435         }
 436
 437         /* Store the two BIGNUMs in raw_buf. */
 438         r_len = BN_num_bytes(ecdsa_sig->r);
 439         s_len = BN_num_bytes(ecdsa_sig->s);
 440         bn_len = (degree + 7) / 8;
 441         if ((r_len > bn_len) || (s_len > bn_len)) {
 442             BIO_printf(out, " failed\n");
 443             goto builtin_err;
 444         }
 445         buf_len = 2 * bn_len;
 446         if ((raw_buf = OPENSSL_malloc(buf_len)) == NULL)
 447             goto builtin_err;
 448         /* Pad the bignums with leading zeroes. */
 449         memset(raw_buf, 0, buf_len);
 450         BN_bn2bin(ecdsa_sig->r, raw_buf + bn_len - r_len);
 451         BN_bn2bin(ecdsa_sig->s, raw_buf + buf_len - s_len);
 452
 453         /* Modify a single byte in the buffer. */
 454         offset = raw_buf[10] % buf_len;
 455         dirt = raw_buf[11] ? raw_buf[11] : 1;
 456         raw_buf[offset] ^= dirt;
 457         /* Now read the BIGNUMs back in from raw_buf. */
 458         if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) ||
 459             (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL))
 460             goto builtin_err;
 461
 462         sig_ptr2 = signature;
 463         sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2);
 464         if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1) {
 465             BIO_printf(out, " failed\n");
 466             goto builtin_err;
 467         }
 468         /*
 469          * Sanity check: undo the modification and verify signature.
 470          */
 471         raw_buf[offset] ^= dirt;
 472         if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) ||
 473             (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL))
 474             goto builtin_err;
 475
 476         sig_ptr2 = signature;
 477         sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2);
 478         if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) {
 479             BIO_printf(out, " failed\n");
 480             goto builtin_err;
 481         }
 482         BIO_printf(out, ".");
 483         (void)BIO_flush(out);
 484
 485         BIO_printf(out, " ok\n");
 486         /* cleanup */
 487         /* clean bogus errors */
 488         ERR_clear_error();
 489         OPENSSL_free(signature);
 490         signature = NULL;
 491         EC_KEY_free(eckey);
 492         eckey = NULL;
 493         EC_KEY_free(wrong_eckey);
 494         wrong_eckey = NULL;
 495         ECDSA_SIG_free(ecdsa_sig);
 496         ecdsa_sig = NULL;
 497         OPENSSL_free(raw_buf);
 498         raw_buf = NULL;
 499     }
 500
 501     ret = 1;
 502  builtin_err:
 503     EC_KEY_free(eckey);
 504     EC_KEY_free(wrong_eckey);
 505     if (ecdsa_sig)
 506         ECDSA_SIG_free(ecdsa_sig);
 507     if (signature)
 508         OPENSSL_free(signature);
 509     if (raw_buf)
 510         OPENSSL_free(raw_buf);
 511     if (curves)
 512         OPENSSL_free(curves);
 513
 514     return ret;
 515 }
 516
 517 int main(void)
 518 {
 519     int ret = 1;
 520     BIO *out;
 521
 522     out = BIO_new_fp(stdout, BIO_NOCLOSE);
 523
 524     /* enable memory leak checking unless explicitly disabled */
 525     if (!((getenv("OPENSSL_DEBUG_MEMORY") != NULL) &&
 526           (0 == strcmp(getenv("OPENSSL_DEBUG_MEMORY"), "off")))) {
 527         CRYPTO_malloc_debug_init();
 528         CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL);
 529     } else {
 530         /* OPENSSL_DEBUG_MEMORY=off */
 531         CRYPTO_set_mem_debug_functions(0, 0, 0, 0, 0);
 532     }
 533     CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
 534
 535     ERR_load_crypto_strings();
 536
 537     /* initialize the prng */
 538     RAND_seed(rnd_seed, sizeof(rnd_seed));
 539
 540     /* the tests */
 541     if (!x9_62_tests(out))
 542         goto err;
 543     if (!test_builtin(out))
 544         goto err;
 545
 546     ret = 0;
 547  err:
 548     if (ret)
 549         BIO_printf(out, "\nECDSA test failed\n");
 550     else
 551         BIO_printf(out, "\nECDSA test passed\n");
 552     if (ret)
 553         ERR_print_errors(out);
 554     CRYPTO_cleanup_all_ex_data();
 555     ERR_remove_thread_state(NULL);
 556     ERR_free_strings();
 557     CRYPTO_mem_leaks(out);
 558     BIO_free(out);
 559     return ret;
 560 }
 561 #endif