1 /* crypto/ecdsa/ecdsatest.c */
3 * Written by Nils Larsch for the OpenSSL project.
5 /* ====================================================================
6 * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
58 /* ====================================================================
59 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
61 * Portions of the attached software ("Contribution") are developed by
62 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
64 * The Contribution is licensed pursuant to the OpenSSL open source
65 * license provided above.
67 * The elliptic curve binary polynomial software is originally written by
68 * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems Laboratories.
76 #include <openssl/opensslconf.h> /* To see if OPENSSL_NO_ECDSA is defined */
78 #ifdef OPENSSL_NO_ECDSA
79 int main(int argc, char * argv[])
81 puts("Elliptic curves are disabled.");
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>
94 #include <openssl/err.h>
95 #include <openssl/rand.h>
97 static const char rnd_seed[] = "string to make the random number generator "
98 "think it has entropy";
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 *);
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);
110 RAND_METHOD fake_rand;
111 const RAND_METHOD *old_rand;
113 int change_rand(void)
115 /* save old rand method */
116 if ((old_rand = RAND_get_rand_method()) == NULL)
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))
132 int restore_rand(void)
134 if (!RAND_set_rand_method(old_rand))
140 static int fbytes_counter = 0, use_fake = 0;
141 static const char *numbers[8] = {
142 "651056770906015076056810763456358567190100156695615665659",
143 "6140507067065001063065065565667405560006161556565665656654",
144 "8763001015071075675010661307616710783570106710677817767166"
146 "7000000175690566466555057817571571075705015757757057795755"
148 "1275552191113212300012030439187146164646146646466749494799",
149 "1542725565216523985789236956265265265235675811949404040041",
150 "1456427555219115346513212300075341203043918714616464614664"
152 "1712787255652165239672857892369562652652652356758119494040"
155 int fbytes(unsigned char *buf, int num)
161 return old_rand->bytes(buf, num);
165 if (fbytes_counter >= 8)
170 if (!BN_dec2bn(&tmp, numbers[fbytes_counter]))
176 if (num != BN_num_bytes(tmp) || !BN_bn2bin(tmp, buf))
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)
188 const char message[] = "abc";
189 unsigned char digest[20];
190 unsigned int dgst_len = 0;
193 ECDSA_SIG *signature = NULL;
194 BIGNUM *r = NULL, *s = NULL;
195 BIGNUM *kinv = NULL, *rp = NULL;
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))
204 BIO_printf(out, "testing %s: ", OBJ_nid2sn(nid));
206 if ((key = EC_KEY_new_by_curve_name(nid)) == NULL)
209 if (!EC_KEY_generate_key(key))
211 BIO_printf(out, ".");
212 (void)BIO_flush(out);
213 /* create the signature */
215 /* Use ECDSA_sign_setup to avoid use of ECDSA nonces */
216 if (!ECDSA_sign_setup(key, NULL, &kinv, &rp))
218 signature = ECDSA_do_sign_ex(digest, 20, kinv, rp, key);
219 if (signature == NULL)
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)
226 if (!BN_dec2bn(&r, r_in) ||
227 !BN_dec2bn(&s, s_in))
229 if (BN_cmp(signature->r ,r) || BN_cmp(signature->s, s))
231 BIO_printf(out, ".");
232 (void)BIO_flush(out);
233 /* verify the signature */
234 if (ECDSA_do_verify(digest, 20, signature, key) != 1)
236 BIO_printf(out, ".");
237 (void)BIO_flush(out);
239 BIO_printf(out, " ok\n");
243 BIO_printf(out, " failed\n");
247 ECDSA_SIG_free(signature);
252 EVP_MD_CTX_cleanup(&md_ctx);
260 int x9_62_tests(BIO *out)
264 BIO_printf(out, "some tests from X9.62:\n");
266 /* set own rand method */
270 if (!x9_62_test_internal(out, NID_X9_62_prime192v1,
271 "3342403536405981729393488334694600415596881826869351677613",
272 "5735822328888155254683894997897571951568553642892029982342"))
274 if (!x9_62_test_internal(out, NID_X9_62_prime239v1,
275 "3086361431751678114926225473006680188549593787585317781474"
277 "3238135532097973577080787768312505059318910517550078427819"
280 #ifndef OPENSSL_NO_EC2M
281 if (!x9_62_test_internal(out, NID_X9_62_c2tnb191v1,
282 "87194383164871543355722284926904419997237591535066528048",
283 "308992691965804947361541664549085895292153777025772063598"))
285 if (!x9_62_test_internal(out, NID_X9_62_c2tnb239v1,
286 "2159633321041961198501834003903461262881815148684178964245"
288 "1970303740007316867383349976549972270528498040721988191026"
299 int test_builtin(BIO *out)
301 EC_builtin_curve *curves = NULL;
302 size_t crv_len = 0, n = 0;
303 EC_KEY *eckey = NULL, *wrong_eckey = NULL;
305 ECDSA_SIG *ecdsa_sig = NULL;
306 unsigned char digest[20], wrong_digest[20];
307 unsigned char *signature = NULL;
308 const unsigned char *sig_ptr;
309 unsigned char *sig_ptr2;
310 unsigned char *raw_buf = NULL;
311 unsigned int sig_len, degree, r_len, s_len, bn_len, buf_len;
314 /* fill digest values with some random data */
315 if (!RAND_pseudo_bytes(digest, 20) ||
316 !RAND_pseudo_bytes(wrong_digest, 20))
318 BIO_printf(out, "ERROR: unable to get random data\n");
322 /* create and verify a ecdsa signature with every availble curve
324 BIO_printf(out, "\ntesting ECDSA_sign() and ECDSA_verify() "
325 "with some internal curves:\n");
327 /* get a list of all internal curves */
328 crv_len = EC_get_builtin_curves(NULL, 0);
330 curves = OPENSSL_malloc(sizeof(EC_builtin_curve) * crv_len);
334 BIO_printf(out, "malloc error\n");
338 if (!EC_get_builtin_curves(curves, crv_len))
340 BIO_printf(out, "unable to get internal curves\n");
344 /* now create and verify a signature for every curve */
345 for (n = 0; n < crv_len; n++)
347 unsigned char dirt, offset;
350 if (nid == NID_ipsec4)
352 /* create new ecdsa key (== EC_KEY) */
353 if ((eckey = EC_KEY_new()) == NULL)
355 group = EC_GROUP_new_by_curve_name(nid);
358 if (EC_KEY_set_group(eckey, group) == 0)
360 EC_GROUP_free(group);
361 degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey));
369 BIO_printf(out, "%s: ", OBJ_nid2sn(nid));
371 if (!EC_KEY_generate_key(eckey))
373 BIO_printf(out, " failed\n");
376 /* create second key */
377 if ((wrong_eckey = EC_KEY_new()) == NULL)
379 group = EC_GROUP_new_by_curve_name(nid);
382 if (EC_KEY_set_group(wrong_eckey, group) == 0)
384 EC_GROUP_free(group);
385 if (!EC_KEY_generate_key(wrong_eckey))
387 BIO_printf(out, " failed\n");
391 BIO_printf(out, ".");
392 (void)BIO_flush(out);
394 if (!EC_KEY_check_key(eckey))
396 BIO_printf(out, " failed\n");
399 BIO_printf(out, ".");
400 (void)BIO_flush(out);
401 /* create signature */
402 sig_len = ECDSA_size(eckey);
403 if ((signature = OPENSSL_malloc(sig_len)) == NULL)
405 if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey))
407 BIO_printf(out, " failed\n");
410 BIO_printf(out, ".");
411 (void)BIO_flush(out);
412 /* verify signature */
413 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1)
415 BIO_printf(out, " failed\n");
418 BIO_printf(out, ".");
419 (void)BIO_flush(out);
420 /* verify signature with the wrong key */
421 if (ECDSA_verify(0, digest, 20, signature, sig_len,
424 BIO_printf(out, " failed\n");
427 BIO_printf(out, ".");
428 (void)BIO_flush(out);
430 if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len,
433 BIO_printf(out, " failed\n");
436 BIO_printf(out, ".");
437 (void)BIO_flush(out);
439 if (ECDSA_verify(0, digest, 20, signature, sig_len - 1,
442 BIO_printf(out, " failed\n");
445 BIO_printf(out, ".");
446 (void)BIO_flush(out);
448 /* Modify a single byte of the signature: to ensure we don't
449 * garble the ASN1 structure, we read the raw signature and
450 * modify a byte in one of the bignums directly. */
452 if ((ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)) == NULL)
454 BIO_printf(out, " failed\n");
458 /* Store the two BIGNUMs in raw_buf. */
459 r_len = BN_num_bytes(ecdsa_sig->r);
460 s_len = BN_num_bytes(ecdsa_sig->s);
461 bn_len = (degree + 7) / 8;
462 if ((r_len > bn_len) || (s_len > bn_len))
464 BIO_printf(out, " failed\n");
467 buf_len = 2 * bn_len;
468 if ((raw_buf = OPENSSL_malloc(buf_len)) == NULL)
470 /* Pad the bignums with leading zeroes. */
471 memset(raw_buf, 0, buf_len);
472 BN_bn2bin(ecdsa_sig->r, raw_buf + bn_len - r_len);
473 BN_bn2bin(ecdsa_sig->s, raw_buf + buf_len - s_len);
475 /* Modify a single byte in the buffer. */
476 offset = raw_buf[10] % buf_len;
477 dirt = raw_buf[11] ? raw_buf[11] : 1;
478 raw_buf[offset] ^= dirt;
479 /* Now read the BIGNUMs back in from raw_buf. */
480 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) ||
481 (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL))
484 sig_ptr2 = signature;
485 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2);
486 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1)
488 BIO_printf(out, " failed\n");
491 /* Sanity check: undo the modification and verify signature. */
492 raw_buf[offset] ^= dirt;
493 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) ||
494 (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL))
497 sig_ptr2 = signature;
498 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2);
499 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1)
501 BIO_printf(out, " failed\n");
504 BIO_printf(out, ".");
505 (void)BIO_flush(out);
507 BIO_printf(out, " ok\n");
509 /* clean bogus errors */
511 OPENSSL_free(signature);
515 EC_KEY_free(wrong_eckey);
517 ECDSA_SIG_free(ecdsa_sig);
519 OPENSSL_free(raw_buf);
528 EC_KEY_free(wrong_eckey);
530 ECDSA_SIG_free(ecdsa_sig);
532 OPENSSL_free(signature);
534 OPENSSL_free(raw_buf);
536 OPENSSL_free(curves);
546 out = BIO_new_fp(stdout, BIO_NOCLOSE);
548 /* enable memory leak checking unless explicitly disabled */
549 if (!((getenv("OPENSSL_DEBUG_MEMORY") != NULL) &&
550 (0 == strcmp(getenv("OPENSSL_DEBUG_MEMORY"), "off"))))
552 CRYPTO_malloc_debug_init();
553 CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL);
557 /* OPENSSL_DEBUG_MEMORY=off */
558 CRYPTO_set_mem_debug_functions(0, 0, 0, 0, 0);
560 CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
562 ERR_load_crypto_strings();
564 /* initialize the prng */
565 RAND_seed(rnd_seed, sizeof(rnd_seed));
568 if (!x9_62_tests(out)) goto err;
569 if (!test_builtin(out)) goto err;
574 BIO_printf(out, "\nECDSA test failed\n");
576 BIO_printf(out, "\nECDSA test passed\n");
578 ERR_print_errors(out);
579 CRYPTO_cleanup_all_ex_data();
580 ERR_remove_thread_state(NULL);
582 CRYPTO_mem_leaks(out);