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;
  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 (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 */
  182: int 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;
  231: x962_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: 
  246: int 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;
  278: x962_err:
  279:         if (!restore_rand())
  280:                 ret = 0;
  281:         return ret;
  282:         }
  283: 
  284: int 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;       
  441: builtin_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: 
  454: int 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;
  485: err:    
  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_state(0);
  494:         ERR_free_strings();
  495:         CRYPTO_mem_leaks(out);
  496:         if (out != NULL)
  497:                 BIO_free(out);
  498:         return ret;
  499:         }      
  500: #endif