/* 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;

}