ctr_eFuse/cr_keyPair.c

/* ====================================================================
 * Copyright (c) 1998-2008 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
 *    openssl-core@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 (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR 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.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <time.h>
#include <sys/time.h>
#include <string.h>

#include <openssl/err.h>
#include <openssl/ec.h>
#include <openssl/ecdsa.h>

#include "cr_generate_id.h"
#include "cr_generate_id_private.h"

static int generate_EC_private_key( EC_KEY *eckey, u8 *privKey );
static int generate_EC_public_key( EC_KEY *eckey );


// ECCキーペアの生成
int GenarateECCKeyPair( EC_KEY **ppECkey, u8 *pECPrivkey )
{
	int openssl_result = 0;

	// 楕円を選択   ( NID_X9_62_prime256v1 -> 32bytesまで、 NID_sect571r1 -> 71bytesまで 署名にデータを含められる )
	*ppECkey = EC_KEY_new_by_curve_name( NID_sect233r1 );
	if( *ppECkey == NULL )
	{
		return CR_GENID_ERROR_EC_KEY_NEW_1;
	}

	// 秘密鍵生成
	openssl_result = generate_EC_private_key( *ppECkey, pECPrivkey );
	if( openssl_result != 0 )
	{
		return CR_GENID_ERROR_EC_GENERATE_PRIVATE_KEY;
	}

	// 公開鍵生成
	openssl_result = generate_EC_public_key( *ppECkey );
	if ( openssl_result == 0 )
	{
		return CR_GENID_ERROR_EC_GENERATE_PUBLIC_KEY;
	}

	// ASN.1 形式指定フラグをセットする
	// (これをセットしないと色々変なフィールドが入ってしまうため)
	EC_KEY_set_asn1_flag( *ppECkey, 1 );

	return CR_GENID_SUCCESS;
}


// EC秘密鍵を生成
static int generate_EC_private_key( EC_KEY *eckey, u8 *privKey )
{
	int ret_code = CR_GENID_SUCCESS;
	BIGNUM *bn_privkey = NULL;

	// 乱数を取得して、秘密鍵にする。
	ret_code = GenerateRandom( privKey, EC_PRIVATE_KEY_LENGTH );
	if ( ret_code != CR_GENID_SUCCESS ) {
		return ret_code;
	}

	// ECC233 で30バイトだけ利用するので、後ろ2バイトは0で埋める
	// (DER(BER) が big endian なので、ここでは先頭2byte)
	// 最後に3バイト目の7ビットをクリアする
	privKey[ 0 ] = 0;
	privKey[ 1 ] = 0;
	privKey[ 2 ] &= 0x01;
	
	// 生成した秘密鍵をBNに変換して、eckeyにセット
	// ※bn_privkeyは、生成に成功した場合、ここではBN_freeされずにeckey要素の一つになって引き渡されます。
	bn_privkey = BN_new();
	if( bn_privkey == NULL ) 
	{
	    return CR_GENID_ERROR_BN_NEW_0;
	}
	BN_init( bn_privkey ); /* memset(a,0,sizeof(BIGNUM)); */
	(void)BN_bin2bn( privKey, EC_PRIVATE_KEY_LENGTH, bn_privkey );
	eckey->priv_key = bn_privkey;

	DEBUG_PRINT_ARRAY( "ec private key:", (const char *)privKey, EC_PRIVATE_KEY_LENGTH );

	return ret_code;
}	// generate_EC_private_key


// EC公開鍵を生成	※opensslコードから抜粋し、一部改変
static int generate_EC_public_key( EC_KEY *eckey )
{
  int	ok = 0;
  BN_CTX	*ctx = NULL;
  BIGNUM	*priv_key = NULL, *order = NULL;
  EC_POINT *pub_key = NULL;

  if (!eckey || !eckey->group)
    {
      ECerr(EC_F_EC_KEY_GENERATE_KEY, ERR_R_PASSED_NULL_PARAMETER);
      return 0;
    }

  if ((order = BN_new()) == NULL) goto err;
  if ((ctx = BN_CTX_new()) == NULL) goto err;

  if (eckey->priv_key == NULL)
    {
      priv_key = BN_new();
      if (priv_key == NULL) {
	goto err;
      }
    }
  else {
    priv_key = eckey->priv_key;
  }

  if (!EC_GROUP_get_order(eckey->group, order, ctx)) {
    goto err;
  }

#if 0	// 2009.09.25 これが実行されると、秘密鍵が乱数化されてしまい、指定した秘密鍵と変わってしまうためコメントアウトする。
  do
    if (!BN_rand_range(priv_key, order))
      goto err;
  while (BN_is_zero(priv_key));
#endif

  if (eckey->pub_key == NULL)
    {
      pub_key = EC_POINT_new(eckey->group);
      if (pub_key == NULL) {
	goto err;
      }
    }
  else
    pub_key = eckey->pub_key;

  if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, ctx)) {
    goto err;
  }

  eckey->priv_key = priv_key;
  eckey->pub_key  = pub_key;

  ok=1;

 err:	
  if (order)
    BN_free(order);
  if (pub_key  != NULL && eckey->pub_key  == NULL)
    EC_POINT_free(pub_key);
  if (priv_key != NULL && eckey->priv_key == NULL)
    BN_free(priv_key);
  if (ctx != NULL)
    BN_CTX_free(ctx);
    
  return(ok);
}	// generate_EC_public_key


// 鍵ペアをECDSAで検証
int TestECDSA( EC_KEY *pECkey )
{
#define CR_ECDSA_BUF_SIZE       29
#define CR_ECDSA_SIGN_BUF_SIZE  256

	unsigned char ecdsa_test_buf[CR_ECDSA_BUF_SIZE];
	unsigned char ecdsasig[CR_ECDSA_SIGN_BUF_SIZE];
	unsigned int  ecdsasiglen = 0;
	int openssl_result = 0;
	int i;
	
	// ダミー署名データ作成
	for( i = 0 ; i < CR_ECDSA_BUF_SIZE ; i++ ) {
		ecdsa_test_buf[i] = (u8)(0xff & i );
	}
	memset( ecdsasig, 0, CR_ECDSA_SIGN_BUF_SIZE );
	
	openssl_result = ECDSA_sign( 0, ecdsa_test_buf, CR_ECDSA_BUF_SIZE, ecdsasig, 
                          &ecdsasiglen, pECkey );
	if (openssl_result == 0) {
		return CR_GENID_ERROR_ECDSA_SIGN;
	}
	
	openssl_result = ECDSA_verify( 0, ecdsa_test_buf, CR_ECDSA_BUF_SIZE, ecdsasig, ecdsasiglen, pECkey );
    if( openssl_result != 1) {
		return CR_GENID_ERROR_ECDSA_VERIFY;
	}
	
	return CR_GENID_SUCCESS;
}