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_EC is defined */
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/ec.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 static RAND_METHOD fake_rand;
111 static 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"
156 int fbytes(unsigned char *buf, int num)
162 return old_rand->bytes(buf, num);
166 if (fbytes_counter >= 8)
171 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;
191 EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
193 ECDSA_SIG *signature = NULL;
194 BIGNUM *r = NULL, *s = NULL;
195 BIGNUM *kinv = NULL, *rp = NULL;
196 BIGNUM *sig_r, *sig_s;
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))
207 BIO_printf(out, "testing %s: ", OBJ_nid2sn(nid));
209 if ((key = EC_KEY_new_by_curve_name(nid)) == NULL)
212 if (!EC_KEY_generate_key(key))
214 BIO_printf(out, ".");
215 (void)BIO_flush(out);
216 /* create the signature */
218 /* Use ECDSA_sign_setup to avoid use of ECDSA nonces */
219 if (!ECDSA_sign_setup(key, NULL, &kinv, &rp))
221 signature = ECDSA_do_sign_ex(digest, 20, kinv, rp, key);
222 if (signature == NULL)
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)
229 if (!BN_dec2bn(&r, r_in) || !BN_dec2bn(&s, s_in))
231 ECDSA_SIG_get0(&sig_r, &sig_s, signature);
232 if (BN_cmp(sig_r, r) || BN_cmp(sig_s, s))
234 BIO_printf(out, ".");
235 (void)BIO_flush(out);
236 /* verify the signature */
237 if (ECDSA_do_verify(digest, 20, signature, key) != 1)
239 BIO_printf(out, ".");
240 (void)BIO_flush(out);
242 BIO_printf(out, " ok\n");
246 BIO_printf(out, " failed\n");
248 ECDSA_SIG_free(signature);
251 EVP_MD_CTX_free(md_ctx);
257 int x9_62_tests(BIO *out)
261 BIO_printf(out, "some tests from X9.62:\n");
263 /* set own rand method */
267 if (!x9_62_test_internal(out, NID_X9_62_prime192v1,
268 "3342403536405981729393488334694600415596881826869351677613",
269 "5735822328888155254683894997897571951568553642892029982342"))
271 if (!x9_62_test_internal(out, NID_X9_62_prime239v1,
272 "3086361431751678114926225473006680188549593787585317781474"
274 "3238135532097973577080787768312505059318910517550078427819"
277 # ifndef OPENSSL_NO_EC2M
278 if (!x9_62_test_internal(out, NID_X9_62_c2tnb191v1,
279 "87194383164871543355722284926904419997237591535066528048",
280 "308992691965804947361541664549085895292153777025772063598"))
282 if (!x9_62_test_internal(out, NID_X9_62_c2tnb239v1,
283 "2159633321041961198501834003903461262881815148684178964245"
285 "1970303740007316867383349976549972270528498040721988191026"
296 int test_builtin(BIO *out)
298 EC_builtin_curve *curves = NULL;
299 size_t crv_len = 0, n = 0;
300 EC_KEY *eckey = NULL, *wrong_eckey = NULL;
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;
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");
319 * create and verify a ecdsa signature with every availble curve (with )
321 BIO_printf(out, "\ntesting ECDSA_sign() and ECDSA_verify() "
322 "with some internal curves:\n");
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");
332 if (!EC_get_builtin_curves(curves, crv_len)) {
333 BIO_printf(out, "unable to get internal curves\n");
337 /* now create and verify a signature for every curve */
338 for (n = 0; n < crv_len; n++) {
339 unsigned char dirt, offset;
342 if (nid == NID_ipsec4)
344 /* create new ecdsa key (== EC_KEY) */
345 if ((eckey = EC_KEY_new()) == NULL)
347 group = EC_GROUP_new_by_curve_name(nid);
350 if (EC_KEY_set_group(eckey, group) == 0)
352 EC_GROUP_free(group);
353 degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey));
360 BIO_printf(out, "%s: ", OBJ_nid2sn(nid));
362 if (!EC_KEY_generate_key(eckey)) {
363 BIO_printf(out, " failed\n");
366 /* create second key */
367 if ((wrong_eckey = EC_KEY_new()) == NULL)
369 group = EC_GROUP_new_by_curve_name(nid);
372 if (EC_KEY_set_group(wrong_eckey, group) == 0)
374 EC_GROUP_free(group);
375 if (!EC_KEY_generate_key(wrong_eckey)) {
376 BIO_printf(out, " failed\n");
380 BIO_printf(out, ".");
381 (void)BIO_flush(out);
383 if (!EC_KEY_check_key(eckey)) {
384 BIO_printf(out, " failed\n");
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)
393 if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey)) {
394 BIO_printf(out, " failed\n");
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");
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");
411 BIO_printf(out, ".");
412 (void)BIO_flush(out);
414 if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len, eckey) == 1) {
415 BIO_printf(out, " failed\n");
418 BIO_printf(out, ".");
419 (void)BIO_flush(out);
421 if (ECDSA_verify(0, digest, 20, signature, sig_len - 1, eckey) == 1) {
422 BIO_printf(out, " failed\n");
425 BIO_printf(out, ".");
426 (void)BIO_flush(out);
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.
434 if ((ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)) == NULL) {
435 BIO_printf(out, " failed\n");
439 ECDSA_SIG_get0(&sig_r, &sig_s, ecdsa_sig);
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");
449 buf_len = 2 * bn_len;
450 if ((raw_buf = OPENSSL_zalloc(buf_len)) == NULL)
452 BN_bn2bin(sig_r, raw_buf + bn_len - r_len);
453 BN_bn2bin(sig_s, raw_buf + buf_len - s_len);
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))
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");
471 * Sanity check: undo the modification and verify signature.
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))
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");
484 BIO_printf(out, ".");
485 (void)BIO_flush(out);
487 BIO_printf(out, " ok\n");
489 /* clean bogus errors */
491 OPENSSL_free(signature);
495 EC_KEY_free(wrong_eckey);
497 ECDSA_SIG_free(ecdsa_sig);
499 OPENSSL_free(raw_buf);
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);
520 out = BIO_new_fp(stdout, BIO_NOCLOSE | BIO_FP_TEXT);
522 /* enable memory leak checking unless explicitly disabled */
523 if (!((getenv("OPENSSL_DEBUG_MEMORY") != NULL) &&
524 (0 == strcmp(getenv("OPENSSL_DEBUG_MEMORY"), "off")))) {
525 CRYPTO_malloc_debug_init();
526 CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL);
528 /* OPENSSL_DEBUG_MEMORY=off */
529 CRYPTO_set_mem_debug_functions(0, 0, 0, 0, 0);
531 CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
533 ERR_load_crypto_strings();
535 /* initialize the prng */
536 RAND_seed(rnd_seed, sizeof(rnd_seed));
539 if (!x9_62_tests(out))
541 if (!test_builtin(out))
547 BIO_printf(out, "\nECDSA test failed\n");
549 BIO_printf(out, "\nECDSA test passed\n");
551 ERR_print_errors(out);
552 CRYPTO_cleanup_all_ex_data();
553 ERR_remove_thread_state(NULL);
555 CRYPTO_mem_leaks(out);