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/ec.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 static RAND_METHOD fake_rand;
 111 static 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 = EVP_MD_CTX_new();
 192     EC_KEY *key = NULL;
 193     ECDSA_SIG *signature = NULL;
 194     BIGNUM *r = NULL, *s = NULL;
 195     BIGNUM *kinv = NULL, *rp = NULL;
 196     BIGNUM *sig_r, *sig_s;
 197
 198     if (md_ctx == NULL)
 199         goto x962_int_err;
 200
 201     /* get the message digest */
 202     if (!EVP_DigestInit(md_ctx, EVP_sha1())
 203         || !EVP_DigestUpdate(md_ctx, (const void *)message, 3)
 204         || !EVP_DigestFinal(md_ctx, digest, &dgst_len))
 205         goto x962_int_err;
 206
 207     BIO_printf(out, "testing %s: ", OBJ_nid2sn(nid));
 208     /* create the key */
 209     if ((key = EC_KEY_new_by_curve_name(nid)) == NULL)
 210         goto x962_int_err;
 211     use_fake = 1;
 212     if (!EC_KEY_generate_key(key))
 213         goto x962_int_err;
 214     BIO_printf(out, ".");
 215     (void)BIO_flush(out);
 216     /* create the signature */
 217     use_fake = 1;
 218     /* Use ECDSA_sign_setup to avoid use of ECDSA nonces */
 219     if (!ECDSA_sign_setup(key, NULL, &kinv, &rp))
 220         goto x962_int_err;
 221     signature = ECDSA_do_sign_ex(digest, 20, kinv, rp, key);
 222     if (signature == NULL)
 223         goto x962_int_err;
 224     BIO_printf(out, ".");
 225     (void)BIO_flush(out);
 226     /* compare the created signature with the expected signature */
 227     if ((r = BN_new()) == NULL || (s = BN_new()) == NULL)
 228         goto x962_int_err;
 229     if (!BN_dec2bn(&r, r_in) || !BN_dec2bn(&s, s_in))
 230         goto x962_int_err;
 231     ECDSA_SIG_get0(&sig_r, &sig_s, signature);
 232     if (BN_cmp(sig_r, r) || BN_cmp(sig_s, s))
 233         goto x962_int_err;
 234     BIO_printf(out, ".");
 235     (void)BIO_flush(out);
 236     /* verify the signature */
 237     if (ECDSA_do_verify(digest, 20, signature, key) != 1)
 238         goto x962_int_err;
 239     BIO_printf(out, ".");
 240     (void)BIO_flush(out);
 241
 242     BIO_printf(out, " ok\n");
 243     ret = 1;
 244  x962_int_err:
 245     if (!ret)
 246         BIO_printf(out, " failed\n");
 247     EC_KEY_free(key);
 248     ECDSA_SIG_free(signature);
 249     BN_free(r);
 250     BN_free(s);
 251     EVP_MD_CTX_free(md_ctx);
 252     BN_clear_free(kinv);
 253     BN_clear_free(rp);
 254     return ret;
 255 }
 256
 257 int x9_62_tests(BIO *out)
 258 {
 259     int ret = 0;
 260
 261     BIO_printf(out, "some tests from X9.62:\n");
 262
 263     /* set own rand method */
 264     if (!change_rand())
 265         goto x962_err;
 266
 267     if (!x9_62_test_internal(out, NID_X9_62_prime192v1,
 268                              "3342403536405981729393488334694600415596881826869351677613",
 269                              "5735822328888155254683894997897571951568553642892029982342"))
 270         goto x962_err;
 271     if (!x9_62_test_internal(out, NID_X9_62_prime239v1,
 272                              "3086361431751678114926225473006680188549593787585317781474"
 273                              "62058306432176",
 274                              "3238135532097973577080787768312505059318910517550078427819"
 275                              "78505179448783"))
 276         goto x962_err;
 277 # ifndef OPENSSL_NO_EC2M
 278     if (!x9_62_test_internal(out, NID_X9_62_c2tnb191v1,
 279                              "87194383164871543355722284926904419997237591535066528048",
 280                              "308992691965804947361541664549085895292153777025772063598"))
 281         goto x962_err;
 282     if (!x9_62_test_internal(out, NID_X9_62_c2tnb239v1,
 283                              "2159633321041961198501834003903461262881815148684178964245"
 284                              "5876922391552",
 285                              "1970303740007316867383349976549972270528498040721988191026"
 286                              "49413465737174"))
 287         goto x962_err;
 288 # endif
 289     ret = 1;
 290  x962_err:
 291     if (!restore_rand())
 292         ret = 0;
 293     return ret;
 294 }
 295
 296 int test_builtin(BIO *out)
 297 {
 298     EC_builtin_curve *curves = NULL;
 299     size_t crv_len = 0, n = 0;
 300     EC_KEY *eckey = NULL, *wrong_eckey = NULL;
 301     EC_GROUP *group;
 302     ECDSA_SIG *ecdsa_sig = NULL;
 303     unsigned char digest[20], wrong_digest[20];
 304     unsigned char *signature = NULL;
 305     const unsigned char *sig_ptr;
 306     unsigned char *sig_ptr2;
 307     unsigned char *raw_buf = NULL;
 308     BIGNUM *sig_r, *sig_s;
 309     unsigned int sig_len, degree, r_len, s_len, bn_len, buf_len;
 310     int nid, ret = 0;
 311
 312     /* fill digest values with some random data */
 313     if (RAND_bytes(digest, 20) <= 0 || RAND_bytes(wrong_digest, 20) <= 0) {
 314         BIO_printf(out, "ERROR: unable to get random data\n");
 315         goto builtin_err;
 316     }
 317
 318     /*
 319      * create and verify a ecdsa signature with every availble curve (with )
 320      */
 321     BIO_printf(out, "\ntesting ECDSA_sign() and ECDSA_verify() "
 322                "with some internal curves:\n");
 323
 324     /* get a list of all internal curves */
 325     crv_len = EC_get_builtin_curves(NULL, 0);
 326     curves = OPENSSL_malloc(sizeof(*curves) * crv_len);
 327     if (curves == NULL) {
 328         BIO_printf(out, "malloc error\n");
 329         goto builtin_err;
 330     }
 331
 332     if (!EC_get_builtin_curves(curves, crv_len)) {
 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         unsigned char dirt, offset;
 340
 341         nid = curves[n].nid;
 342         if (nid == NID_ipsec4)
 343             continue;
 344         /* create new ecdsa key (== EC_KEY) */
 345         if ((eckey = EC_KEY_new()) == NULL)
 346             goto builtin_err;
 347         group = EC_GROUP_new_by_curve_name(nid);
 348         if (group == NULL)
 349             goto builtin_err;
 350         if (EC_KEY_set_group(eckey, group) == 0)
 351             goto builtin_err;
 352         EC_GROUP_free(group);
 353         degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey));
 354         if (degree < 160) {
 355             /* drop the curve */
 356             EC_KEY_free(eckey);
 357             eckey = NULL;
 358             continue;
 359         }
 360         BIO_printf(out, "%s: ", OBJ_nid2sn(nid));
 361         /* create key */
 362         if (!EC_KEY_generate_key(eckey)) {
 363             BIO_printf(out, " failed\n");
 364             goto builtin_err;
 365         }
 366         /* create second key */
 367         if ((wrong_eckey = EC_KEY_new()) == NULL)
 368             goto builtin_err;
 369         group = EC_GROUP_new_by_curve_name(nid);
 370         if (group == NULL)
 371             goto builtin_err;
 372         if (EC_KEY_set_group(wrong_eckey, group) == 0)
 373             goto builtin_err;
 374         EC_GROUP_free(group);
 375         if (!EC_KEY_generate_key(wrong_eckey)) {
 376             BIO_printf(out, " failed\n");
 377             goto builtin_err;
 378         }
 379
 380         BIO_printf(out, ".");
 381         (void)BIO_flush(out);
 382         /* check key */
 383         if (!EC_KEY_check_key(eckey)) {
 384             BIO_printf(out, " failed\n");
 385             goto builtin_err;
 386         }
 387         BIO_printf(out, ".");
 388         (void)BIO_flush(out);
 389         /* create signature */
 390         sig_len = ECDSA_size(eckey);
 391         if ((signature = OPENSSL_malloc(sig_len)) == NULL)
 392             goto builtin_err;
 393         if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey)) {
 394             BIO_printf(out, " failed\n");
 395             goto builtin_err;
 396         }
 397         BIO_printf(out, ".");
 398         (void)BIO_flush(out);
 399         /* verify signature */
 400         if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) {
 401             BIO_printf(out, " failed\n");
 402             goto builtin_err;
 403         }
 404         BIO_printf(out, ".");
 405         (void)BIO_flush(out);
 406         /* verify signature with the wrong key */
 407         if (ECDSA_verify(0, digest, 20, signature, sig_len, wrong_eckey) == 1) {
 408             BIO_printf(out, " failed\n");
 409             goto builtin_err;
 410         }
 411         BIO_printf(out, ".");
 412         (void)BIO_flush(out);
 413         /* wrong digest */
 414         if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len, eckey) == 1) {
 415             BIO_printf(out, " failed\n");
 416             goto builtin_err;
 417         }
 418         BIO_printf(out, ".");
 419         (void)BIO_flush(out);
 420         /* wrong length */
 421         if (ECDSA_verify(0, digest, 20, signature, sig_len - 1, eckey) == 1) {
 422             BIO_printf(out, " failed\n");
 423             goto builtin_err;
 424         }
 425         BIO_printf(out, ".");
 426         (void)BIO_flush(out);
 427
 428         /*
 429          * Modify a single byte of the signature: to ensure we don't garble
 430          * the ASN1 structure, we read the raw signature and modify a byte in
 431          * one of the bignums directly.
 432          */
 433         sig_ptr = signature;
 434         if ((ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)) == NULL) {
 435             BIO_printf(out, " failed\n");
 436             goto builtin_err;
 437         }
 438
 439         ECDSA_SIG_get0(&sig_r, &sig_s, ecdsa_sig);
 440
 441         /* Store the two BIGNUMs in raw_buf. */
 442         r_len = BN_num_bytes(sig_r);
 443         s_len = BN_num_bytes(sig_s);
 444         bn_len = (degree + 7) / 8;
 445         if ((r_len > bn_len) || (s_len > bn_len)) {
 446             BIO_printf(out, " failed\n");
 447             goto builtin_err;
 448         }
 449         buf_len = 2 * bn_len;
 450         if ((raw_buf = OPENSSL_zalloc(buf_len)) == NULL)
 451             goto builtin_err;
 452         BN_bn2bin(sig_r, raw_buf + bn_len - r_len);
 453         BN_bn2bin(sig_s, raw_buf + buf_len - s_len);
 454
 455         /* Modify a single byte in the buffer. */
 456         offset = raw_buf[10] % buf_len;
 457         dirt = raw_buf[11] ? raw_buf[11] : 1;
 458         raw_buf[offset] ^= dirt;
 459         /* Now read the BIGNUMs back in from raw_buf. */
 460         if ((BN_bin2bn(raw_buf, bn_len, sig_r) == NULL) ||
 461             (BN_bin2bn(raw_buf + bn_len, bn_len, sig_s) == NULL))
 462             goto builtin_err;
 463
 464         sig_ptr2 = signature;
 465         sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2);
 466         if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1) {
 467             BIO_printf(out, " failed\n");
 468             goto builtin_err;
 469         }
 470         /*
 471          * Sanity check: undo the modification and verify signature.
 472          */
 473         raw_buf[offset] ^= dirt;
 474         if ((BN_bin2bn(raw_buf, bn_len, sig_r) == NULL) ||
 475             (BN_bin2bn(raw_buf + bn_len, bn_len, sig_s) == NULL))
 476             goto builtin_err;
 477
 478         sig_ptr2 = signature;
 479         sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2);
 480         if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) {
 481             BIO_printf(out, " failed\n");
 482             goto builtin_err;
 483         }
 484         BIO_printf(out, ".");
 485         (void)BIO_flush(out);
 486
 487         BIO_printf(out, " ok\n");
 488         /* cleanup */
 489         /* clean bogus errors */
 490         ERR_clear_error();
 491         OPENSSL_free(signature);
 492         signature = NULL;
 493         EC_KEY_free(eckey);
 494         eckey = NULL;
 495         EC_KEY_free(wrong_eckey);
 496         wrong_eckey = NULL;
 497         ECDSA_SIG_free(ecdsa_sig);
 498         ecdsa_sig = NULL;
 499         OPENSSL_free(raw_buf);
 500         raw_buf = NULL;
 501     }
 502
 503     ret = 1;
 504  builtin_err:
 505     EC_KEY_free(eckey);
 506     EC_KEY_free(wrong_eckey);
 507     ECDSA_SIG_free(ecdsa_sig);
 508     OPENSSL_free(signature);
 509     OPENSSL_free(raw_buf);
 510     OPENSSL_free(curves);
 511
 512     return ret;
 513 }
 514
 515 int main(void)
 516 {
 517     int ret = 1;
 518     BIO *out;
 519     char *p;
 520
 521     out = BIO_new_fp(stdout, BIO_NOCLOSE | BIO_FP_TEXT);
 522
 523     p = getenv("OPENSSL_DEBUG_MEMORY");
 524     if (p != NULL && strcmp(p, "on") == 0)
 525         CRYPTO_set_mem_debug(1);
 526     ERR_load_crypto_strings();
 527
 528     /* initialize the prng */
 529     RAND_seed(rnd_seed, sizeof(rnd_seed));
 530
 531     /* the tests */
 532     if (!x9_62_tests(out))
 533         goto err;
 534     if (!test_builtin(out))
 535         goto err;
 536
 537     ret = 0;
 538  err:
 539     if (ret)
 540         BIO_printf(out, "\nECDSA test failed\n");
 541     else
 542         BIO_printf(out, "\nECDSA test passed\n");
 543     if (ret)
 544         ERR_print_errors(out);
 545     CRYPTO_cleanup_all_ex_data();
 546     ERR_remove_thread_state(NULL);
 547     ERR_free_strings();
 548 #ifdef CRYPTO_MDEBUG
 549     CRYPTO_mem_leaks(out);
 550 #endif
 551     BIO_free(out);
 552     return ret;
 553 }
 554 #endif