/* 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;

 }