/* p5_pbe.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/asn1_mac.h>
#include <openssl/rand.h>

/* PKCS#5 password based encryption structure */

#define PKCS5_SALT_LEN	8

int i2d_PBEPARAM(PBEPARAM *a, unsigned char **pp)
{
	M_ASN1_I2D_vars(a);
	M_ASN1_I2D_len (a->salt, i2d_ASN1_OCTET_STRING);
	M_ASN1_I2D_len (a->iter, i2d_ASN1_INTEGER);

	M_ASN1_I2D_seq_total ();

	M_ASN1_I2D_put (a->salt, i2d_ASN1_OCTET_STRING);
	M_ASN1_I2D_put (a->iter, i2d_ASN1_INTEGER);
	M_ASN1_I2D_finish();
}

PBEPARAM *PBEPARAM_new(void)
{
	PBEPARAM *ret=NULL;
	ASN1_CTX c;
	M_ASN1_New_Malloc(ret, PBEPARAM);
	M_ASN1_New(ret->iter,ASN1_INTEGER_new);
	M_ASN1_New(ret->salt,ASN1_OCTET_STRING_new);
	return (ret);
	M_ASN1_New_Error(ASN1_F_PBEPARAM_NEW);
}

PBEPARAM *d2i_PBEPARAM(PBEPARAM **a, unsigned char **pp, long length)
{
	M_ASN1_D2I_vars(a,PBEPARAM *,PBEPARAM_new);
	M_ASN1_D2I_Init();
	M_ASN1_D2I_start_sequence();
	M_ASN1_D2I_get (ret->salt, d2i_ASN1_OCTET_STRING);
	M_ASN1_D2I_get (ret->iter, d2i_ASN1_INTEGER);
	M_ASN1_D2I_Finish(a, PBEPARAM_free, ASN1_F_D2I_PBEPARAM);
}

void PBEPARAM_free (PBEPARAM *a)
{
	if(a==NULL) return;
	ASN1_OCTET_STRING_free(a->salt);
	ASN1_INTEGER_free (a->iter);
	Free ((char *)a);
}

/* Return an algorithm identifier for a PKCS#5 PBE algorithm */

X509_ALGOR *PKCS5_pbe_set(int alg, int iter, unsigned char *salt,
	     int saltlen)
{
	unsigned char *pdata, *ptmp;
	int plen;
	PBEPARAM *pbe;
	ASN1_OBJECT *al;
	X509_ALGOR *algor;
	ASN1_TYPE *astype;

	if (!(pbe = PBEPARAM_new ())) {
		ASN1err(ASN1_F_ASN1_PBE_SET,ERR_R_MALLOC_FAILURE);
		return NULL;
	}
	ASN1_INTEGER_set (pbe->iter, iter);
	if (!saltlen) saltlen = PKCS5_SALT_LEN;
	if (!(pbe->salt->data = Malloc (saltlen))) {
		ASN1err(ASN1_F_ASN1_PBE_SET,ERR_R_MALLOC_FAILURE);
		return NULL;
	}
	pbe->salt->length = saltlen;
	if (salt) memcpy (pbe->salt->data, salt, saltlen);
	else RAND_bytes (pbe->salt->data, saltlen);
	if (!(plen = i2d_PBEPARAM (pbe, NULL))) {
		ASN1err(ASN1_F_ASN1_PBE_SET,ASN1_R_ENCODE_ERROR);
		return NULL;
	}
	if (!(pdata = Malloc (plen))) {
		ASN1err(ASN1_F_ASN1_PBE_SET,ERR_R_MALLOC_FAILURE);
		return NULL;
	}
	ptmp = pdata;
	i2d_PBEPARAM (pbe, &ptmp);
	PBEPARAM_free (pbe);

	if (!(astype = ASN1_TYPE_new())) {
		ASN1err(ASN1_F_ASN1_PBE_SET,ERR_R_MALLOC_FAILURE);
		return NULL;
	}

	astype->type = V_ASN1_SEQUENCE;
	if (!(astype->value.sequence=ASN1_STRING_new())) {
		ASN1err(ASN1_F_ASN1_PBE_SET,ERR_R_MALLOC_FAILURE);
		return NULL;
	}
	ASN1_STRING_set (astype->value.sequence, pdata, plen);
	Free (pdata);
	
	al = OBJ_nid2obj(alg); /* never need to free al */
	if (!(algor = X509_ALGOR_new())) {
		ASN1err(ASN1_F_ASN1_PBE_SET,ERR_R_MALLOC_FAILURE);
		return NULL;
	}
	ASN1_OBJECT_free(algor->algorithm);
	algor->algorithm = al;
	algor->parameter = astype;

	return (algor);
}