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ecdsatest.c

/* crypto/ecdsa/ecdsatest.c */
/*
 * Written by Nils Larsch for the OpenSSL project.
 */
/* ====================================================================
 * Copyright (c) 2000-2005 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */
/* ====================================================================
 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 *
 * Portions of the attached software ("Contribution") are developed by 
 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 *
 * The Contribution is licensed pursuant to the OpenSSL open source
 * license provided above.
 *
 * The elliptic curve binary polynomial software is originally written by 
 * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems Laboratories.
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <openssl/opensslconf.h> /* To see if OPENSSL_NO_ECDSA is defined */

#ifdef OPENSSL_NO_ECDSA
int main(int argc, char * argv[])
      {
      puts("Elliptic curves are disabled.");
      return 0;
      }
#else

#include <openssl/crypto.h>
#include <openssl/bio.h>
#include <openssl/evp.h>
#include <openssl/bn.h>
#include <openssl/ecdsa.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif
#include <openssl/err.h>
#include <openssl/rand.h>

static const char rnd_seed[] = "string to make the random number generator "
      "think it has entropy";

/* declaration of the test functions */
int x9_62_tests(BIO *);
int x9_62_test_internal(BIO *out, int nid, const char *r, const char *s);
int test_builtin(BIO *);

/* functions to change the RAND_METHOD */
int change_rand(void);
int restore_rand(void);
int fbytes(unsigned char *buf, int num);

RAND_METHOD fake_rand;
const RAND_METHOD *old_rand;

int change_rand(void)
      {
      /* save old rand method */
      if ((old_rand = RAND_get_rand_method()) == NULL)
            return 0;

      fake_rand.seed    = old_rand->seed;
      fake_rand.cleanup = old_rand->cleanup;
      fake_rand.add     = old_rand->add;
      fake_rand.status  = old_rand->status;
      /* use own random function */
      fake_rand.bytes      = fbytes;
      fake_rand.pseudorand = old_rand->bytes;
      /* set new RAND_METHOD */
      if (!RAND_set_rand_method(&fake_rand))
            return 0;
      return 1;
      }

int restore_rand(void)
      {
      if (!RAND_set_rand_method(old_rand))
            return 0;
      else
            return 1;
      }

static int fbytes_counter = 0;
static const char *numbers[8] = {
      "651056770906015076056810763456358567190100156695615665659",
      "6140507067065001063065065565667405560006161556565665656654",
      "8763001015071075675010661307616710783570106710677817767166"
      "71676178726717",
      "7000000175690566466555057817571571075705015757757057795755"
      "55657156756655",
      "1275552191113212300012030439187146164646146646466749494799",
      "1542725565216523985789236956265265265235675811949404040041",
      "1456427555219115346513212300075341203043918714616464614664"
      "64667494947990",
      "1712787255652165239672857892369562652652652356758119494040"
      "40041670216363"};

int fbytes(unsigned char *buf, int num)
      {
      int   ret;
      BIGNUM      *tmp = NULL;

      if (fbytes_counter >= 8)
            return 0;
      tmp = BN_new();
      if (!tmp)
            return 0;
      if (!BN_dec2bn(&tmp, numbers[fbytes_counter]))
            {
            BN_free(tmp);
            return 0;
            }
      fbytes_counter ++;
      ret = BN_bn2bin(tmp, buf);    
      if (ret == 0 || ret != num)
            ret = 0;
      else
            ret = 1;
      if (tmp)
            BN_free(tmp);
      return ret;
      }

/* some tests from the X9.62 draft */
int x9_62_test_internal(BIO *out, int nid, const char *r_in, const char *s_in)
      {
      int   ret = 0;
      const char message[] = "abc";
      unsigned char digest[20];
      unsigned int  dgst_len = 0;
      EVP_MD_CTX md_ctx;
      EC_KEY    *key = NULL;
      ECDSA_SIG *signature = NULL;
      BIGNUM    *r = NULL, *s = NULL;

      EVP_MD_CTX_init(&md_ctx);
      /* get the message digest */
      EVP_DigestInit(&md_ctx, EVP_ecdsa());
      EVP_DigestUpdate(&md_ctx, (const void*)message, 3);
      EVP_DigestFinal(&md_ctx, digest, &dgst_len);

      BIO_printf(out, "testing %s: ", OBJ_nid2sn(nid));
      /* create the key */
      if ((key = EC_KEY_new_by_curve_name(nid)) == NULL)
            goto x962_int_err;
      if (!EC_KEY_generate_key(key))
            goto x962_int_err;
      BIO_printf(out, ".");
      BIO_flush(out);
      /* create the signature */
      signature = ECDSA_do_sign(digest, 20, key);
      if (signature == NULL)
            goto x962_int_err;
      BIO_printf(out, ".");
      BIO_flush(out);
      /* compare the created signature with the expected signature */
      if ((r = BN_new()) == NULL || (s = BN_new()) == NULL)
            goto x962_int_err;
      if (!BN_dec2bn(&r, r_in) ||
          !BN_dec2bn(&s, s_in))
            goto x962_int_err;
      if (BN_cmp(signature->r ,r) || BN_cmp(signature->s, s))
            goto x962_int_err;
      BIO_printf(out, ".");
      BIO_flush(out);
      /* verify the signature */
      if (ECDSA_do_verify(digest, 20, signature, key) != 1)
            goto x962_int_err;
      BIO_printf(out, ".");
      BIO_flush(out);

      BIO_printf(out, " ok\n");
      ret = 1;
x962_int_err:
      if (!ret)
            BIO_printf(out, " failed\n");
      if (key)
            EC_KEY_free(key);
      if (signature)
            ECDSA_SIG_free(signature);
      if (r)
            BN_free(r);
      if (s)
            BN_free(s);
      EVP_MD_CTX_cleanup(&md_ctx);
      return ret;
      }

int x9_62_tests(BIO *out)
      {
      int ret = 0;

      BIO_printf(out, "some tests from X9.62:\n");

      /* set own rand method */
      if (!change_rand())
            goto x962_err;

      if (!x9_62_test_internal(out, NID_X9_62_prime192v1,
            "3342403536405981729393488334694600415596881826869351677613",
            "5735822328888155254683894997897571951568553642892029982342"))
            goto x962_err;
      if (!x9_62_test_internal(out, NID_X9_62_prime239v1,
            "3086361431751678114926225473006680188549593787585317781474"
            "62058306432176",
            "3238135532097973577080787768312505059318910517550078427819"
            "78505179448783"))
            goto x962_err;
      if (!x9_62_test_internal(out, NID_X9_62_c2tnb191v1,
            "87194383164871543355722284926904419997237591535066528048",
            "308992691965804947361541664549085895292153777025772063598"))
            goto x962_err;
      if (!x9_62_test_internal(out, NID_X9_62_c2tnb239v1,
            "2159633321041961198501834003903461262881815148684178964245"
            "5876922391552",
            "1970303740007316867383349976549972270528498040721988191026"
            "49413465737174"))
            goto x962_err;

      ret = 1;
x962_err:
      if (!restore_rand())
            ret = 0;
      return ret;
      }

int test_builtin(BIO *out)
      {
      EC_builtin_curve *curves = NULL;
      size_t            crv_len = 0, n = 0;
      EC_KEY            *eckey = NULL, *wrong_eckey = NULL;
      EC_GROUP    *group;
      unsigned char     digest[20], wrong_digest[20];
      unsigned char     *signature = NULL; 
      unsigned int      sig_len;
      int         nid, ret =  0;
      
      /* fill digest values with some random data */
      if (!RAND_pseudo_bytes(digest, 20) ||
          !RAND_pseudo_bytes(wrong_digest, 20))
            {
            BIO_printf(out, "ERROR: unable to get random data\n");
            goto builtin_err;
            }

      /* create and verify a ecdsa signature with every availble curve
       * (with ) */
      BIO_printf(out, "\ntesting ECDSA_sign() and ECDSA_verify() "
            "with some internal curves:\n");

      /* get a list of all internal curves */
      crv_len = EC_get_builtin_curves(NULL, 0);

      curves = OPENSSL_malloc(sizeof(EC_builtin_curve) * crv_len);

      if (curves == NULL)
            {
            BIO_printf(out, "malloc error\n");
            goto builtin_err;
            }
      
      if (!EC_get_builtin_curves(curves, crv_len))
            {
            BIO_printf(out, "unable to get internal curves\n");
            goto builtin_err;
            }

      /* now create and verify a signature for every curve */
      for (n = 0; n < crv_len; n++)
            {
            unsigned char dirt, offset;

            nid = curves[n].nid;
            if (nid == NID_ipsec4)
                  continue;
            /* create new ecdsa key (== EC_KEY) */
            if ((eckey = EC_KEY_new()) == NULL)
                  goto builtin_err;
            group = EC_GROUP_new_by_curve_name(nid);
            if (group == NULL)
                  goto builtin_err;
            if (EC_KEY_set_group(eckey, group) == 0)
                  goto builtin_err;
            EC_GROUP_free(group);
            if (EC_GROUP_get_degree(EC_KEY_get0_group(eckey)) < 160)
                  /* drop the curve */ 
                  {
                  EC_KEY_free(eckey);
                  eckey = NULL;
                  continue;
                  }
            BIO_printf(out, "%s: ", OBJ_nid2sn(nid));
            /* create key */
            if (!EC_KEY_generate_key(eckey))
                  {
                  BIO_printf(out, " failed\n");
                  goto builtin_err;
                  }
            /* create second key */
            if ((wrong_eckey = EC_KEY_new()) == NULL)
                  goto builtin_err;
            group = EC_GROUP_new_by_curve_name(nid);
            if (group == NULL)
                  goto builtin_err;
            if (EC_KEY_set_group(wrong_eckey, group) == 0)
                  goto builtin_err;
            EC_GROUP_free(group);
            if (!EC_KEY_generate_key(wrong_eckey))
                  {
                  BIO_printf(out, " failed\n");
                  goto builtin_err;
                  }

            BIO_printf(out, ".");
            BIO_flush(out);
            /* check key */
            if (!EC_KEY_check_key(eckey))
                  {
                  BIO_printf(out, " failed\n");
                  goto builtin_err;
                  }
            BIO_printf(out, ".");
            BIO_flush(out);
            /* create signature */
            sig_len = ECDSA_size(eckey);
            if ((signature = OPENSSL_malloc(sig_len)) == NULL)
                  goto builtin_err;
                if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey))
                  {
                  BIO_printf(out, " failed\n");
                  goto builtin_err;
                  }
            BIO_printf(out, ".");
            BIO_flush(out);
            /* verify signature */
            if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1)
                  {
                  BIO_printf(out, " failed\n");
                  goto builtin_err;
                  }
            BIO_printf(out, ".");
            BIO_flush(out);
            /* verify signature with the wrong key */
            if (ECDSA_verify(0, digest, 20, signature, sig_len, 
                  wrong_eckey) == 1)
                  {
                  BIO_printf(out, " failed\n");
                  goto builtin_err;
                  }
            BIO_printf(out, ".");
            BIO_flush(out);
            /* wrong digest */
            if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len,
                  eckey) == 1)
                  {
                  BIO_printf(out, " failed\n");
                  goto builtin_err;
                  }
            BIO_printf(out, ".");
            BIO_flush(out);
            /* modify a single byte of the signature */
            offset = signature[10] % sig_len;
            dirt   = signature[11];
            signature[offset] ^= dirt ? dirt : 1; 
            if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1)
                  {
                  BIO_printf(out, " failed\n");
                  goto builtin_err;
                  }
            BIO_printf(out, ".");
            BIO_flush(out);
            
            BIO_printf(out, " ok\n");
            /* cleanup */
            OPENSSL_free(signature);
            signature = NULL;
            EC_KEY_free(eckey);
            eckey = NULL;
            EC_KEY_free(wrong_eckey);
            wrong_eckey = NULL;
            }

      ret = 1;    
builtin_err:
      if (eckey)
            EC_KEY_free(eckey);
      if (wrong_eckey)
            EC_KEY_free(wrong_eckey);
      if (signature)
            OPENSSL_free(signature);
      if (curves)
            OPENSSL_free(curves);

      return ret;
      }

int main(void)
      {
      int   ret = 1;
      BIO   *out;

      out = BIO_new_fp(stdout, BIO_NOCLOSE);
      
      /* enable memory leak checking unless explicitly disabled */
      if (!((getenv("OPENSSL_DEBUG_MEMORY") != NULL) && 
            (0 == strcmp(getenv("OPENSSL_DEBUG_MEMORY"), "off"))))
            {
            CRYPTO_malloc_debug_init();
            CRYPTO_set_mem_debug_options(V_CRYPTO_MDEBUG_ALL);
            }
      else
            {
            /* OPENSSL_DEBUG_MEMORY=off */
            CRYPTO_set_mem_debug_functions(0, 0, 0, 0, 0);
            }
      CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);

      ERR_load_crypto_strings();

      /* initialize the prng */
      RAND_seed(rnd_seed, sizeof(rnd_seed));

      /* the tests */
      if (!x9_62_tests(out))  goto err;
      if (!test_builtin(out)) goto err;
      
      ret = 0;
err:  
      if (ret)    
            BIO_printf(out, "\nECDSA test failed\n");
      else 
            BIO_printf(out, "\nECDSA test passed\n");
      if (ret)
            ERR_print_errors(out);
      CRYPTO_cleanup_all_ex_data();
      ERR_remove_state(0);
      ERR_free_strings();
      CRYPTO_mem_leaks(out);
      if (out != NULL)
            BIO_free(out);
      return ret;
      }     
#endif

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