/* asn_pack.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.h>

#ifndef NO_ASN1_OLD

/* ASN1 packing and unpacking functions */

/* Turn an ASN1 encoded SEQUENCE OF into a STACK of structures */

EXPORT_C STACK *ASN1_seq_unpack(const unsigned char *buf, int len,

		       d2i_of_void *d2i,void (*free_func)(void *))

{

    STACK *sk;

    const unsigned char *pbuf;

    pbuf =  buf;

    if (!(sk = d2i_ASN1_SET(NULL, &pbuf, len, d2i, free_func,

					V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL)))

		 ASN1err(ASN1_F_ASN1_SEQ_UNPACK,ASN1_R_DECODE_ERROR);

    return sk;

}

/* Turn a STACK structures into an ASN1 encoded SEQUENCE OF structure in a

 * OPENSSL_malloc'ed buffer

 */

EXPORT_C unsigned char *ASN1_seq_pack(STACK *safes, i2d_of_void *i2d,

			     unsigned char **buf, int *len)

{

	int safelen;

	unsigned char *safe, *p;

	if (!(safelen = i2d_ASN1_SET(safes, NULL, i2d, V_ASN1_SEQUENCE,

					      V_ASN1_UNIVERSAL, IS_SEQUENCE))) {

		ASN1err(ASN1_F_ASN1_SEQ_PACK,ASN1_R_ENCODE_ERROR);

		return NULL;

	}

	if (!(safe = OPENSSL_malloc (safelen))) {

		ASN1err(ASN1_F_ASN1_SEQ_PACK,ERR_R_MALLOC_FAILURE);

		return NULL;

	}

	p = safe;

	i2d_ASN1_SET(safes, &p, i2d, V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL,

								 IS_SEQUENCE);

	if (len) *len = safelen;

	if (buf) *buf = safe;

	return safe;

}

/* Extract an ASN1 object from an ASN1_STRING */

EXPORT_C void *ASN1_unpack_string(ASN1_STRING *oct, d2i_of_void *d2i)

{

	const unsigned char *p;

	char *ret;

	p = oct->data;

	if(!(ret = d2i(NULL, &p, oct->length)))

		ASN1err(ASN1_F_ASN1_UNPACK_STRING,ASN1_R_DECODE_ERROR);

	return ret;

}

/* Pack an ASN1 object into an ASN1_STRING */

EXPORT_C ASN1_STRING *ASN1_pack_string(void *obj, i2d_of_void *i2d, ASN1_STRING **oct)

{

	unsigned char *p;

	ASN1_STRING *octmp;

	if (!oct || !*oct) {

		if (!(octmp = ASN1_STRING_new ())) {

			ASN1err(ASN1_F_ASN1_PACK_STRING,ERR_R_MALLOC_FAILURE);

			return NULL;

		}

		if (oct) *oct = octmp;

	} else octmp = *oct;

	if (!(octmp->length = i2d(obj, NULL))) {

		ASN1err(ASN1_F_ASN1_PACK_STRING,ASN1_R_ENCODE_ERROR);

		return NULL;

	}

	if (!(p = OPENSSL_malloc (octmp->length))) {

		ASN1err(ASN1_F_ASN1_PACK_STRING,ERR_R_MALLOC_FAILURE);

		return NULL;

	}

	octmp->data = p;

	i2d (obj, &p);

	return octmp;

}

#endif

/* ASN1_ITEM versions of the above */

EXPORT_C ASN1_STRING *ASN1_item_pack(void *obj, const ASN1_ITEM *it, ASN1_STRING **oct)

{

	ASN1_STRING *octmp;

	if (!oct || !*oct) {

		if (!(octmp = ASN1_STRING_new ())) {

			ASN1err(ASN1_F_ASN1_ITEM_PACK,ERR_R_MALLOC_FAILURE);

			return NULL;

		}

		if (oct) *oct = octmp;

	} else octmp = *oct;

	if(octmp->data) {

		OPENSSL_free(octmp->data);

		octmp->data = NULL;

	}

	if (!(octmp->length = ASN1_item_i2d(obj, &octmp->data, it))) {

		ASN1err(ASN1_F_ASN1_ITEM_PACK,ASN1_R_ENCODE_ERROR);

		return NULL;

	}

	if (!octmp->data) {

		ASN1err(ASN1_F_ASN1_ITEM_PACK,ERR_R_MALLOC_FAILURE);

		return NULL;

	}

	return octmp;

}

/* Extract an ASN1 object from an ASN1_STRING */

EXPORT_C void *ASN1_item_unpack(ASN1_STRING *oct, const ASN1_ITEM *it)

{

	const unsigned char *p;

	void *ret;

	p = oct->data;

	if(!(ret = ASN1_item_d2i(NULL, &p, oct->length, it)))

		ASN1err(ASN1_F_ASN1_ITEM_UNPACK,ASN1_R_DECODE_ERROR);

	return ret;

}