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
79int 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
97static const char rnd_seed[] = "string to make the random number generator "
98	"think it has entropy";
99
100/* declaration of the test functions */
101int x9_62_tests(BIO *);
102int x9_62_test_internal(BIO *out, int nid, const char *r, const char *s);
103int test_builtin(BIO *);
104
105/* functions to change the RAND_METHOD */
106int change_rand(void);
107int restore_rand(void);
108int fbytes(unsigned char *buf, int num);
109
110RAND_METHOD	fake_rand;
111const RAND_METHOD *old_rand;
112
113int 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
132int restore_rand(void)
133	{
134	if (!RAND_set_rand_method(old_rand))
135		return 0;
136	else
137		return 1;
138	}
139
140static int fbytes_counter = 0;
141static 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
155int fbytes(unsigned char *buf, int num)
156	{
157	int	ret;
158	BIGNUM	*tmp = NULL;
159
160	if (fbytes_counter >= 8)
161		return 0;
162	tmp = BN_new();
163	if (!tmp)
164		return 0;
165	if (!BN_dec2bn(&tmp, numbers[fbytes_counter]))
166		{
167		BN_free(tmp);
168		return 0;
169		}
170	fbytes_counter ++;
171	ret = BN_bn2bin(tmp, buf);
172	if (ret == 0 || ret != num)
173		ret = 0;
174	else
175		ret = 1;
176	if (tmp)
177		BN_free(tmp);
178	return ret;
179	}
180
181/* some tests from the X9.62 draft */
182int x9_62_test_internal(BIO *out, int nid, const char *r_in, const char *s_in)
183	{
184	int	ret = 0;
185	const char message[] = "abc";
186	unsigned char digest[20];
187	unsigned int  dgst_len = 0;
188	EVP_MD_CTX md_ctx;
189	EC_KEY    *key = NULL;
190	ECDSA_SIG *signature = NULL;
191	BIGNUM    *r = NULL, *s = NULL;
192
193	EVP_MD_CTX_init(&md_ctx);
194	/* get the message digest */
195	EVP_DigestInit(&md_ctx, EVP_ecdsa());
196	EVP_DigestUpdate(&md_ctx, (const void*)message, 3);
197	EVP_DigestFinal(&md_ctx, digest, &dgst_len);
198
199	BIO_printf(out, "testing %s: ", OBJ_nid2sn(nid));
200	/* create the key */
201	if ((key = EC_KEY_new_by_curve_name(nid)) == NULL)
202		goto x962_int_err;
203	if (!EC_KEY_generate_key(key))
204		goto x962_int_err;
205	BIO_printf(out, ".");
206	(void)BIO_flush(out);
207	/* create the signature */
208	signature = ECDSA_do_sign(digest, 20, key);
209	if (signature == NULL)
210		goto x962_int_err;
211	BIO_printf(out, ".");
212	(void)BIO_flush(out);
213	/* compare the created signature with the expected signature */
214	if ((r = BN_new()) == NULL || (s = BN_new()) == NULL)
215		goto x962_int_err;
216	if (!BN_dec2bn(&r, r_in) ||
217	    !BN_dec2bn(&s, s_in))
218		goto x962_int_err;
219	if (BN_cmp(signature->r ,r) || BN_cmp(signature->s, s))
220		goto x962_int_err;
221	BIO_printf(out, ".");
222	(void)BIO_flush(out);
223	/* verify the signature */
224	if (ECDSA_do_verify(digest, 20, signature, key) != 1)
225		goto x962_int_err;
226	BIO_printf(out, ".");
227	(void)BIO_flush(out);
228
229	BIO_printf(out, " ok\n");
230	ret = 1;
231x962_int_err:
232	if (!ret)
233		BIO_printf(out, " failed\n");
234	if (key)
235		EC_KEY_free(key);
236	if (signature)
237		ECDSA_SIG_free(signature);
238	if (r)
239		BN_free(r);
240	if (s)
241		BN_free(s);
242	EVP_MD_CTX_cleanup(&md_ctx);
243	return ret;
244	}
245
246int x9_62_tests(BIO *out)
247	{
248	int ret = 0;
249
250	BIO_printf(out, "some tests from X9.62:\n");
251
252	/* set own rand method */
253	if (!change_rand())
254		goto x962_err;
255
256	if (!x9_62_test_internal(out, NID_X9_62_prime192v1,
257		"3342403536405981729393488334694600415596881826869351677613",
258		"5735822328888155254683894997897571951568553642892029982342"))
259		goto x962_err;
260	if (!x9_62_test_internal(out, NID_X9_62_prime239v1,
261		"3086361431751678114926225473006680188549593787585317781474"
262		"62058306432176",
263		"3238135532097973577080787768312505059318910517550078427819"
264		"78505179448783"))
265		goto x962_err;
266	if (!x9_62_test_internal(out, NID_X9_62_c2tnb191v1,
267		"87194383164871543355722284926904419997237591535066528048",
268		"308992691965804947361541664549085895292153777025772063598"))
269		goto x962_err;
270	if (!x9_62_test_internal(out, NID_X9_62_c2tnb239v1,
271		"2159633321041961198501834003903461262881815148684178964245"
272		"5876922391552",
273		"1970303740007316867383349976549972270528498040721988191026"
274		"49413465737174"))
275		goto x962_err;
276
277	ret = 1;
278x962_err:
279	if (!restore_rand())
280		ret = 0;
281	return ret;
282	}
283
284int test_builtin(BIO *out)
285	{
286	EC_builtin_curve *curves = NULL;
287	size_t		crv_len = 0, n = 0;
288	EC_KEY		*eckey = NULL, *wrong_eckey = NULL;
289	EC_GROUP	*group;
290	unsigned char	digest[20], wrong_digest[20];
291	unsigned char	*signature = NULL;
292	unsigned int	sig_len;
293	int		nid, ret =  0;
294
295	/* fill digest values with some random data */
296	if (!RAND_pseudo_bytes(digest, 20) ||
297	    !RAND_pseudo_bytes(wrong_digest, 20))
298		{
299		BIO_printf(out, "ERROR: unable to get random data\n");
300		goto builtin_err;
301		}
302
303	/* create and verify a ecdsa signature with every availble curve
304	 * (with ) */
305	BIO_printf(out, "\ntesting ECDSA_sign() and ECDSA_verify() "
306		"with some internal curves:\n");
307
308	/* get a list of all internal curves */
309	crv_len = EC_get_builtin_curves(NULL, 0);
310
311	curves = OPENSSL_malloc(sizeof(EC_builtin_curve) * crv_len);
312
313	if (curves == NULL)
314		{
315		BIO_printf(out, "malloc error\n");
316		goto builtin_err;
317		}
318
319	if (!EC_get_builtin_curves(curves, crv_len))
320		{
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		{
328		unsigned char dirt, offset;
329
330		nid = curves[n].nid;
331		if (nid == NID_ipsec4)
332			continue;
333		/* create new ecdsa key (== EC_KEY) */
334		if ((eckey = EC_KEY_new()) == NULL)
335			goto builtin_err;
336		group = EC_GROUP_new_by_curve_name(nid);
337		if (group == NULL)
338			goto builtin_err;
339		if (EC_KEY_set_group(eckey, group) == 0)
340			goto builtin_err;
341		EC_GROUP_free(group);
342		if (EC_GROUP_get_degree(EC_KEY_get0_group(eckey)) < 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			{
353			BIO_printf(out, " failed\n");
354			goto builtin_err;
355			}
356		/* create second key */
357		if ((wrong_eckey = EC_KEY_new()) == NULL)
358			goto builtin_err;
359		group = EC_GROUP_new_by_curve_name(nid);
360		if (group == NULL)
361			goto builtin_err;
362		if (EC_KEY_set_group(wrong_eckey, group) == 0)
363			goto builtin_err;
364		EC_GROUP_free(group);
365		if (!EC_KEY_generate_key(wrong_eckey))
366			{
367			BIO_printf(out, " failed\n");
368			goto builtin_err;
369			}
370
371		BIO_printf(out, ".");
372		(void)BIO_flush(out);
373		/* check key */
374		if (!EC_KEY_check_key(eckey))
375			{
376			BIO_printf(out, " failed\n");
377			goto builtin_err;
378			}
379		BIO_printf(out, ".");
380		(void)BIO_flush(out);
381		/* create signature */
382		sig_len = ECDSA_size(eckey);
383		if ((signature = OPENSSL_malloc(sig_len)) == NULL)
384			goto builtin_err;
385                if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey))
386			{
387			BIO_printf(out, " failed\n");
388			goto builtin_err;
389			}
390		BIO_printf(out, ".");
391		(void)BIO_flush(out);
392		/* verify signature */
393		if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1)
394			{
395			BIO_printf(out, " failed\n");
396			goto builtin_err;
397			}
398		BIO_printf(out, ".");
399		(void)BIO_flush(out);
400		/* verify signature with the wrong key */
401		if (ECDSA_verify(0, digest, 20, signature, sig_len,
402			wrong_eckey) == 1)
403			{
404			BIO_printf(out, " failed\n");
405			goto builtin_err;
406			}
407		BIO_printf(out, ".");
408		(void)BIO_flush(out);
409		/* wrong digest */
410		if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len,
411			eckey) == 1)
412			{
413			BIO_printf(out, " failed\n");
414			goto builtin_err;
415			}
416		BIO_printf(out, ".");
417		(void)BIO_flush(out);
418		/* modify a single byte of the signature */
419		offset = signature[10] % sig_len;
420		dirt   = signature[11];
421		signature[offset] ^= dirt ? dirt : 1;
422		if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1)
423			{
424			BIO_printf(out, " failed\n");
425			goto builtin_err;
426			}
427		BIO_printf(out, ".");
428		(void)BIO_flush(out);
429
430		BIO_printf(out, " ok\n");
431		/* cleanup */
432		OPENSSL_free(signature);
433		signature = NULL;
434		EC_KEY_free(eckey);
435		eckey = NULL;
436		EC_KEY_free(wrong_eckey);
437		wrong_eckey = NULL;
438		}
439
440	ret = 1;
441builtin_err:
442	if (eckey)
443		EC_KEY_free(eckey);
444	if (wrong_eckey)
445		EC_KEY_free(wrong_eckey);
446	if (signature)
447		OPENSSL_free(signature);
448	if (curves)
449		OPENSSL_free(curves);
450
451	return ret;
452	}
453
454int main(void)
455	{
456	int 	ret = 1;
457	BIO	*out;
458
459	out = BIO_new_fp(stdout, BIO_NOCLOSE);
460
461	/* enable memory leak checking unless explicitly disabled */
462	if (!((getenv("OPENSSL_DEBUG_MEMORY") != NULL) &&
463		(0 == strcmp(getenv("OPENSSL_DEBUG_MEMORY"), "off"))))
464		{
465		CRYPTO_malloc_debug_init();
466		CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL);
467		}
468	else
469		{
470		/* OPENSSL_DEBUG_MEMORY=off */
471		CRYPTO_set_mem_debug_functions(0, 0, 0, 0, 0);
472		}
473	CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
474
475	ERR_load_crypto_strings();
476
477	/* initialize the prng */
478	RAND_seed(rnd_seed, sizeof(rnd_seed));
479
480	/* the tests */
481	if (!x9_62_tests(out))  goto err;
482	if (!test_builtin(out)) goto err;
483
484	ret = 0;
485err:
486	if (ret)
487		BIO_printf(out, "\nECDSA test failed\n");
488	else
489		BIO_printf(out, "\nECDSA test passed\n");
490	if (ret)
491		ERR_print_errors(out);
492	CRYPTO_cleanup_all_ex_data();
493	ERR_remove_thread_state(NULL);
494	ERR_free_strings();
495	CRYPTO_mem_leaks(out);
496	if (out != NULL)
497		BIO_free(out);
498	return ret;
499	}
500#endif
501