/* p5_crpt.c */

 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL

  * project 1999.

  */

 /* ====================================================================

  * Copyright (c) 1999 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).

  *

  */

 #include <stdio.h>

 #include <stdlib.h>

 #include "cryptlib.h"

 #include <openssl/x509.h>

 #include <openssl/evp.h>

 /* PKCS#5 v1.5 compatible PBE functions: see PKCS#5 v2.0 for more info.

  */

 EXPORT_C void PKCS5_PBE_add(void)

 {

 #ifndef OPENSSL_NO_DES

 #  ifndef OPENSSL_NO_MD5

 EVP_PBE_alg_add(NID_pbeWithMD5AndDES_CBC, EVP_des_cbc(), EVP_md5(),

 							 PKCS5_PBE_keyivgen);

 #  endif

 #  ifndef OPENSSL_NO_MD2

 EVP_PBE_alg_add(NID_pbeWithMD2AndDES_CBC, EVP_des_cbc(), EVP_md2(),

 							 PKCS5_PBE_keyivgen);

 #  endif

 #  ifndef OPENSSL_NO_SHA

 EVP_PBE_alg_add(NID_pbeWithSHA1AndDES_CBC, EVP_des_cbc(), EVP_sha1(),

 							 PKCS5_PBE_keyivgen);

 #  endif

 #endif

 #ifndef OPENSSL_NO_RC2

 #  ifndef OPENSSL_NO_MD5

 EVP_PBE_alg_add(NID_pbeWithMD5AndRC2_CBC, EVP_rc2_64_cbc(), EVP_md5(),

 							 PKCS5_PBE_keyivgen);

 #  endif

 #  ifndef OPENSSL_NO_MD2

 EVP_PBE_alg_add(NID_pbeWithMD2AndRC2_CBC, EVP_rc2_64_cbc(), EVP_md2(),

 							 PKCS5_PBE_keyivgen);

 #  endif

 #  ifndef OPENSSL_NO_SHA

 EVP_PBE_alg_add(NID_pbeWithSHA1AndRC2_CBC, EVP_rc2_64_cbc(), EVP_sha1(),

 							 PKCS5_PBE_keyivgen);

 #  endif

 #endif

 #ifndef OPENSSL_NO_HMAC

 EVP_PBE_alg_add(NID_pbes2, NULL, NULL, PKCS5_v2_PBE_keyivgen);

 #endif

 }

 EXPORT_C int PKCS5_PBE_keyivgen(EVP_CIPHER_CTX *cctx, const char *pass, int passlen,

 			 ASN1_TYPE *param, const EVP_CIPHER *cipher, const EVP_MD *md,

 			 int en_de)

 {

 	EVP_MD_CTX ctx;

 	unsigned char md_tmp[EVP_MAX_MD_SIZE];

 	unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];

 	int i;

 	PBEPARAM *pbe;

 	int saltlen, iter;

 	unsigned char *salt;

 	const unsigned char *pbuf;

 	/* Extract useful info from parameter */

 	if (param == NULL || param->type != V_ASN1_SEQUENCE ||

 	    param->value.sequence == NULL) {

 		EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);

 		return 0;

 	}

 	pbuf = param->value.sequence->data;

 	if (!(pbe = d2i_PBEPARAM(NULL, &pbuf, param->value.sequence->length))) {

 		EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);

 		return 0;

 	}

 	if (!pbe->iter) iter = 1;

 	else iter = ASN1_INTEGER_get (pbe->iter);

 	salt = pbe->salt->data;

 	saltlen = pbe->salt->length;

 	if(!pass) passlen = 0;

 	else if(passlen == -1) passlen = strlen(pass);

 	EVP_MD_CTX_init(&ctx);

 	EVP_DigestInit_ex(&ctx, md, NULL);

 	EVP_DigestUpdate(&ctx, pass, passlen);

 	EVP_DigestUpdate(&ctx, salt, saltlen);

 	PBEPARAM_free(pbe);

 	EVP_DigestFinal_ex(&ctx, md_tmp, NULL);

 	for (i = 1; i < iter; i++) {

 		EVP_DigestInit_ex(&ctx, md, NULL);

 		EVP_DigestUpdate(&ctx, md_tmp, EVP_MD_size(md));

 		EVP_DigestFinal_ex (&ctx, md_tmp, NULL);

 	}

 	EVP_MD_CTX_cleanup(&ctx);

 	OPENSSL_assert(EVP_CIPHER_key_length(cipher) <= (int)sizeof(md_tmp));

 	memcpy(key, md_tmp, EVP_CIPHER_key_length(cipher));

 	OPENSSL_assert(EVP_CIPHER_iv_length(cipher) <= 16);

 	memcpy(iv, md_tmp + (16 - EVP_CIPHER_iv_length(cipher)),

 						 EVP_CIPHER_iv_length(cipher));

 	EVP_CipherInit_ex(cctx, cipher, NULL, key, iv, en_de);

 	OPENSSL_cleanse(md_tmp, EVP_MAX_MD_SIZE);

 	OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH);

 	OPENSSL_cleanse(iv, EVP_MAX_IV_LENGTH);

 	return 1;

 }