/* p12_decr.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 "cryptlib.h"

#include <openssl/pkcs12.h>

/* Define this to dump decrypted output to files called DERnnn */

/*#define DEBUG_DECRYPT*/

/* Encrypt/Decrypt a buffer based on password and algor, result in a

 * OPENSSL_malloc'ed buffer

 */

EXPORT_C unsigned char * PKCS12_pbe_crypt(X509_ALGOR *algor, const char *pass,

	     int passlen, unsigned char *in, int inlen, unsigned char **data,

	     int *datalen, int en_de)

{

	unsigned char *out;

	int outlen, i;

	EVP_CIPHER_CTX ctx;

	EVP_CIPHER_CTX_init(&ctx);

	/* Decrypt data */

        if (!EVP_PBE_CipherInit(algor->algorithm, pass, passlen,

					 algor->parameter, &ctx, en_de)) {

		PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT,PKCS12_R_PKCS12_ALGOR_CIPHERINIT_ERROR);

		return NULL;

	}

	if(!(out = OPENSSL_malloc(inlen + EVP_CIPHER_CTX_block_size(&ctx)))) {

		PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT,ERR_R_MALLOC_FAILURE);

		goto err;

	}

	EVP_CipherUpdate(&ctx, out, &i, in, inlen);

	outlen = i;

	if(!EVP_CipherFinal_ex(&ctx, out + i, &i)) {

		OPENSSL_free(out);

		out = NULL;

		PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT,PKCS12_R_PKCS12_CIPHERFINAL_ERROR);

		goto err;

	}

	outlen += i;

	if (datalen) *datalen = outlen;

	if (data) *data = out;

	err:

	EVP_CIPHER_CTX_cleanup(&ctx);

	return out;

}

/* Decrypt an OCTET STRING and decode ASN1 structure 

 * if zbuf set zero buffer after use.

 */

EXPORT_C void * PKCS12_item_decrypt_d2i(X509_ALGOR *algor, const ASN1_ITEM *it,

	     const char *pass, int passlen, ASN1_OCTET_STRING *oct, int zbuf)

{

	unsigned char *out;

	const unsigned char *p;

	void *ret;

	int outlen;

	if (!PKCS12_pbe_crypt(algor, pass, passlen, oct->data, oct->length,

			       &out, &outlen, 0)) {

		PKCS12err(PKCS12_F_PKCS12_ITEM_DECRYPT_D2I,PKCS12_R_PKCS12_PBE_CRYPT_ERROR);

		return NULL;

	}

	p = out;

#ifdef DEBUG_DECRYPT

	{

		FILE *op;

		char fname[30];

		static int fnm = 1;

		sprintf(fname, "DER%d", fnm++);

		op = fopen(fname, "wb");

		fwrite (p, 1, outlen, op);

		fclose(op);

	}

#endif

	ret = ASN1_item_d2i(NULL, &p, outlen, it);

	if (zbuf) OPENSSL_cleanse(out, outlen);

	if(!ret) PKCS12err(PKCS12_F_PKCS12_ITEM_DECRYPT_D2I,PKCS12_R_DECODE_ERROR);

	OPENSSL_free(out);

	return ret;

}

/* Encode ASN1 structure and encrypt, return OCTET STRING 

 * if zbuf set zero encoding.

 */

EXPORT_C ASN1_OCTET_STRING *PKCS12_item_i2d_encrypt(X509_ALGOR *algor, const ASN1_ITEM *it,

				       const char *pass, int passlen,

				       void *obj, int zbuf)

{

	ASN1_OCTET_STRING *oct;

	unsigned char *in = NULL;

	int inlen;

	if (!(oct = M_ASN1_OCTET_STRING_new ())) {

		PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT,ERR_R_MALLOC_FAILURE);

		return NULL;

	}

	inlen = ASN1_item_i2d(obj, &in, it);

	if (!in) {

		PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT,PKCS12_R_ENCODE_ERROR);

		return NULL;

	}

	if (!PKCS12_pbe_crypt(algor, pass, passlen, in, inlen, &oct->data,

				 &oct->length, 1)) {

		PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT,PKCS12_R_ENCRYPT_ERROR);

		OPENSSL_free(in);

		return NULL;

	}

	if (zbuf) OPENSSL_cleanse(in, inlen);

	OPENSSL_free(in);

	return oct;

}

IMPLEMENT_PKCS12_STACK_OF(PKCS7)