fix warning (revert original patch)
[openssl.git] / crypto / ecdsa / 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_ECDSA is defined */
77
78 #ifdef OPENSSL_NO_ECDSA
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 int fbytes(unsigned char *buf, int num)
156         {
157         int     ret;
158         BIGNUM  *tmp = NULL;
159
160         if (use_fake == 0)
161                 return old_rand->bytes(buf, num);
162
163         use_fake = 0;
164
165         if (fbytes_counter >= 8)
166                 return 0;
167         tmp = BN_new();
168         if (!tmp)
169                 return 0;
170         if (!BN_dec2bn(&tmp, numbers[fbytes_counter]))
171                 {
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         if (tmp)
181                 BN_free(tmp);
182         return ret;
183         }
184
185 /* some tests from the X9.62 draft */
186 int x9_62_test_internal(BIO *out, int nid, const char *r_in, const char *s_in)
187         {
188         int     ret = 0;
189         const char message[] = "abc";
190         unsigned char digest[20];
191         unsigned int  dgst_len = 0;
192         EVP_MD_CTX md_ctx;
193         EC_KEY    *key = NULL;
194         ECDSA_SIG *signature = NULL;
195         BIGNUM    *r = NULL, *s = 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         signature = ECDSA_do_sign(digest, 20, key);
216         if (signature == NULL)
217                 goto x962_int_err;
218         BIO_printf(out, ".");
219         (void)BIO_flush(out);
220         /* compare the created signature with the expected signature */
221         if ((r = BN_new()) == NULL || (s = BN_new()) == NULL)
222                 goto x962_int_err;
223         if (!BN_dec2bn(&r, r_in) ||
224             !BN_dec2bn(&s, s_in))
225                 goto x962_int_err;
226         if (BN_cmp(signature->r ,r) || BN_cmp(signature->s, s))
227                 goto x962_int_err;
228         BIO_printf(out, ".");
229         (void)BIO_flush(out);
230         /* verify the signature */
231         if (ECDSA_do_verify(digest, 20, signature, key) != 1)
232                 goto x962_int_err;
233         BIO_printf(out, ".");
234         (void)BIO_flush(out);
235
236         BIO_printf(out, " ok\n");
237         ret = 1;
238 x962_int_err:
239         if (!ret)
240                 BIO_printf(out, " failed\n");
241         if (key)
242                 EC_KEY_free(key);
243         if (signature)
244                 ECDSA_SIG_free(signature);
245         if (r)
246                 BN_free(r);
247         if (s)
248                 BN_free(s);
249         EVP_MD_CTX_cleanup(&md_ctx);
250         return ret;
251         }
252
253 int x9_62_tests(BIO *out)
254         {
255         int ret = 0;
256
257         BIO_printf(out, "some tests from X9.62:\n");
258
259         /* set own rand method */
260         if (!change_rand())
261                 goto x962_err;
262
263         if (!x9_62_test_internal(out, NID_X9_62_prime192v1,
264                 "3342403536405981729393488334694600415596881826869351677613",
265                 "5735822328888155254683894997897571951568553642892029982342"))
266                 goto x962_err;
267         if (!x9_62_test_internal(out, NID_X9_62_prime239v1,
268                 "3086361431751678114926225473006680188549593787585317781474"
269                 "62058306432176",
270                 "3238135532097973577080787768312505059318910517550078427819"
271                 "78505179448783"))
272                 goto x962_err;
273 #ifndef OPENSSL_NO_EC2M
274         if (!x9_62_test_internal(out, NID_X9_62_c2tnb191v1,
275                 "87194383164871543355722284926904419997237591535066528048",
276                 "308992691965804947361541664549085895292153777025772063598"))
277                 goto x962_err;
278         if (!x9_62_test_internal(out, NID_X9_62_c2tnb239v1,
279                 "2159633321041961198501834003903461262881815148684178964245"
280                 "5876922391552",
281                 "1970303740007316867383349976549972270528498040721988191026"
282                 "49413465737174"))
283                 goto x962_err;
284 #endif
285         ret = 1;
286 x962_err:
287         if (!restore_rand())
288                 ret = 0;
289         return ret;
290         }
291
292 int test_builtin(BIO *out)
293         {
294         EC_builtin_curve *curves = NULL;
295         size_t          crv_len = 0, n = 0;
296         EC_KEY          *eckey = NULL, *wrong_eckey = NULL;
297         EC_GROUP        *group;
298         ECDSA_SIG       *ecdsa_sig = NULL;
299         unsigned char   digest[20], wrong_digest[20];
300         unsigned char   *signature = NULL;
301         const unsigned char     *sig_ptr;
302         unsigned char   *sig_ptr2;
303         unsigned char   *raw_buf = NULL;
304         unsigned int    sig_len, degree, r_len, s_len, bn_len, buf_len;
305         int             nid, ret =  0;
306         
307         /* fill digest values with some random data */
308         if (!RAND_pseudo_bytes(digest, 20) ||
309             !RAND_pseudo_bytes(wrong_digest, 20))
310                 {
311                 BIO_printf(out, "ERROR: unable to get random data\n");
312                 goto builtin_err;
313                 }
314
315         /* create and verify a ecdsa signature with every availble curve
316          * (with ) */
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                 {
327                 BIO_printf(out, "malloc error\n");
328                 goto builtin_err;
329                 }
330         
331         if (!EC_get_builtin_curves(curves, crv_len))
332                 {
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                 {
340                 unsigned char dirt, offset;
341
342                 nid = curves[n].nid;
343                 if (nid == NID_ipsec4)
344                         continue;
345                 /* create new ecdsa key (== EC_KEY) */
346                 if ((eckey = EC_KEY_new()) == NULL)
347                         goto builtin_err;
348                 group = EC_GROUP_new_by_curve_name(nid);
349                 if (group == NULL)
350                         goto builtin_err;
351                 if (EC_KEY_set_group(eckey, group) == 0)
352                         goto builtin_err;
353                 EC_GROUP_free(group);
354                 degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey));
355                 if (degree < 160)
356                         /* drop the curve */ 
357                         {
358                         EC_KEY_free(eckey);
359                         eckey = NULL;
360                         continue;
361                         }
362                 BIO_printf(out, "%s: ", OBJ_nid2sn(nid));
363                 /* create key */
364                 if (!EC_KEY_generate_key(eckey))
365                         {
366                         BIO_printf(out, " failed\n");
367                         goto builtin_err;
368                         }
369                 /* create second key */
370                 if ((wrong_eckey = EC_KEY_new()) == NULL)
371                         goto builtin_err;
372                 group = EC_GROUP_new_by_curve_name(nid);
373                 if (group == NULL)
374                         goto builtin_err;
375                 if (EC_KEY_set_group(wrong_eckey, group) == 0)
376                         goto builtin_err;
377                 EC_GROUP_free(group);
378                 if (!EC_KEY_generate_key(wrong_eckey))
379                         {
380                         BIO_printf(out, " failed\n");
381                         goto builtin_err;
382                         }
383
384                 BIO_printf(out, ".");
385                 (void)BIO_flush(out);
386                 /* check key */
387                 if (!EC_KEY_check_key(eckey))
388                         {
389                         BIO_printf(out, " failed\n");
390                         goto builtin_err;
391                         }
392                 BIO_printf(out, ".");
393                 (void)BIO_flush(out);
394                 /* create signature */
395                 sig_len = ECDSA_size(eckey);
396                 if ((signature = OPENSSL_malloc(sig_len)) == NULL)
397                         goto builtin_err;
398                 if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey))
399                         {
400                         BIO_printf(out, " failed\n");
401                         goto builtin_err;
402                         }
403                 BIO_printf(out, ".");
404                 (void)BIO_flush(out);
405                 /* verify signature */
406                 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1)
407                         {
408                         BIO_printf(out, " failed\n");
409                         goto builtin_err;
410                         }
411                 BIO_printf(out, ".");
412                 (void)BIO_flush(out);
413                 /* verify signature with the wrong key */
414                 if (ECDSA_verify(0, digest, 20, signature, sig_len, 
415                         wrong_eckey) == 1)
416                         {
417                         BIO_printf(out, " failed\n");
418                         goto builtin_err;
419                         }
420                 BIO_printf(out, ".");
421                 (void)BIO_flush(out);
422                 /* wrong digest */
423                 if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len,
424                         eckey) == 1)
425                         {
426                         BIO_printf(out, " failed\n");
427                         goto builtin_err;
428                         }
429                 BIO_printf(out, ".");
430                 (void)BIO_flush(out);
431                 /* wrong length */
432                 if (ECDSA_verify(0, digest, 20, signature, sig_len - 1,
433                         eckey) == 1)
434                         {
435                         BIO_printf(out, " failed\n");
436                         goto builtin_err;
437                         }
438                 BIO_printf(out, ".");
439                 (void)BIO_flush(out);
440
441                 /* Modify a single byte of the signature: to ensure we don't
442                  * garble the ASN1 structure, we read the raw signature and
443                  * modify a byte in one of the bignums directly. */
444                 sig_ptr = signature;
445                 if ((ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)) == NULL)
446                         {
447                         BIO_printf(out, " failed\n");
448                         goto builtin_err;
449                         }
450
451                 /* Store the two BIGNUMs in raw_buf. */
452                 r_len = BN_num_bytes(ecdsa_sig->r);
453                 s_len = BN_num_bytes(ecdsa_sig->s);
454                 bn_len = (degree + 7) / 8;
455                 if ((r_len > bn_len) || (s_len > bn_len))
456                         {
457                         BIO_printf(out, " failed\n");
458                         goto builtin_err;
459                         }
460                 buf_len = 2 * bn_len;
461                 if ((raw_buf = OPENSSL_malloc(buf_len)) == NULL)
462                         goto builtin_err;
463                 /* Pad the bignums with leading zeroes. */
464                 memset(raw_buf, 0, buf_len);
465                 BN_bn2bin(ecdsa_sig->r, raw_buf + bn_len - r_len);
466                 BN_bn2bin(ecdsa_sig->s, raw_buf + buf_len - s_len);
467
468                 /* Modify a single byte in the buffer. */
469                 offset = raw_buf[10] % buf_len;
470                 dirt   = raw_buf[11] ? raw_buf[11] : 1;
471                 raw_buf[offset] ^= dirt;
472                 /* Now read the BIGNUMs back in from raw_buf. */
473                 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) ||
474                         (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL))
475                         goto builtin_err;
476
477                 sig_ptr2 = signature;
478                 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2);
479                 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1)
480                         {
481                         BIO_printf(out, " failed\n");
482                         goto builtin_err;
483                         }
484                 /* Sanity check: undo the modification and verify signature. */
485                 raw_buf[offset] ^= dirt;
486                 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) ||
487                         (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL))
488                         goto builtin_err;
489
490                 sig_ptr2 = signature;
491                 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2);
492                 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1)
493                         {
494                         BIO_printf(out, " failed\n");
495                         goto builtin_err;
496                         }
497                 BIO_printf(out, ".");
498                 (void)BIO_flush(out);
499                 
500                 BIO_printf(out, " ok\n");
501                 /* cleanup */
502                 /* clean bogus errors */
503                 ERR_clear_error();
504                 OPENSSL_free(signature);
505                 signature = NULL;
506                 EC_KEY_free(eckey);
507                 eckey = NULL;
508                 EC_KEY_free(wrong_eckey);
509                 wrong_eckey = NULL;
510                 ECDSA_SIG_free(ecdsa_sig);
511                 ecdsa_sig = NULL;
512                 OPENSSL_free(raw_buf);
513                 raw_buf = NULL;
514                 }
515
516         ret = 1;        
517 builtin_err:
518         if (eckey)
519                 EC_KEY_free(eckey);
520         if (wrong_eckey)
521                 EC_KEY_free(wrong_eckey);
522         if (ecdsa_sig)
523                 ECDSA_SIG_free(ecdsa_sig);
524         if (signature)
525                 OPENSSL_free(signature);
526         if (raw_buf)
527                 OPENSSL_free(raw_buf);
528         if (curves)
529                 OPENSSL_free(curves);
530
531         return ret;
532         }
533
534 int main(void)
535         {
536         int     ret = 1;
537         BIO     *out;
538
539         out = BIO_new_fp(stdout, BIO_NOCLOSE);
540         
541         /* enable memory leak checking unless explicitly disabled */
542         if (!((getenv("OPENSSL_DEBUG_MEMORY") != NULL) && 
543                 (0 == strcmp(getenv("OPENSSL_DEBUG_MEMORY"), "off"))))
544                 {
545                 CRYPTO_malloc_debug_init();
546                 CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL);
547                 }
548         else
549                 {
550                 /* OPENSSL_DEBUG_MEMORY=off */
551                 CRYPTO_set_mem_debug_functions(0, 0, 0, 0, 0);
552                 }
553         CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
554
555         ERR_load_crypto_strings();
556
557         /* initialize the prng */
558         RAND_seed(rnd_seed, sizeof(rnd_seed));
559
560         /* the tests */
561         if (!x9_62_tests(out))  goto err;
562         if (!test_builtin(out)) goto err;
563         
564         ret = 0;
565 err:    
566         if (ret)        
567                 BIO_printf(out, "\nECDSA test failed\n");
568         else 
569                 BIO_printf(out, "\nECDSA test passed\n");
570         if (ret)
571                 ERR_print_errors(out);
572         CRYPTO_cleanup_all_ex_data();
573         ERR_remove_thread_state(NULL);
574         ERR_free_strings();
575         CRYPTO_mem_leaks(out);
576         if (out != NULL)
577                 BIO_free(out);
578         return ret;
579         }       
580 #endif