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      1 /* asn_pack.c */
      2 /* Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL
      3  * project 1999.
      4  */
      5 /* ====================================================================
      6  * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  *
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  *
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in
     17  *    the documentation and/or other materials provided with the
     18  *    distribution.
     19  *
     20  * 3. All advertising materials mentioning features or use of this
     21  *    software must display the following acknowledgment:
     22  *    "This product includes software developed by the OpenSSL Project
     23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
     24  *
     25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
     26  *    endorse or promote products derived from this software without
     27  *    prior written permission. For written permission, please contact
     28  *    licensing (at) OpenSSL.org.
     29  *
     30  * 5. Products derived from this software may not be called "OpenSSL"
     31  *    nor may "OpenSSL" appear in their names without prior written
     32  *    permission of the OpenSSL Project.
     33  *
     34  * 6. Redistributions of any form whatsoever must retain the following
     35  *    acknowledgment:
     36  *    "This product includes software developed by the OpenSSL Project
     37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
     38  *
     39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
     40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
     43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
     50  * OF THE POSSIBILITY OF SUCH DAMAGE.
     51  * ====================================================================
     52  *
     53  * This product includes cryptographic software written by Eric Young
     54  * (eay (at) cryptsoft.com).  This product includes software written by Tim
     55  * Hudson (tjh (at) cryptsoft.com).
     56  *
     57  */
     58 
     59 #include <stdio.h>
     60 #include "cryptlib.h"
     61 #include <openssl/asn1.h>
     62 
     63 #ifndef NO_ASN1_OLD
     64 
     65 /* ASN1 packing and unpacking functions */
     66 
     67 /* Turn an ASN1 encoded SEQUENCE OF into a STACK of structures */
     68 
     69 STACK_OF(OPENSSL_BLOCK) *ASN1_seq_unpack(const unsigned char *buf, int len,
     70 			 d2i_of_void *d2i, void (*free_func)(OPENSSL_BLOCK))
     71 {
     72     STACK_OF(OPENSSL_BLOCK) *sk;
     73     const unsigned char *pbuf;
     74     pbuf =  buf;
     75     if (!(sk = d2i_ASN1_SET(NULL, &pbuf, len, d2i, free_func,
     76 					V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL)))
     77 		 ASN1err(ASN1_F_ASN1_SEQ_UNPACK,ASN1_R_DECODE_ERROR);
     78     return sk;
     79 }
     80 
     81 /* Turn a STACK structures into an ASN1 encoded SEQUENCE OF structure in a
     82  * OPENSSL_malloc'ed buffer
     83  */
     84 
     85 unsigned char *ASN1_seq_pack(STACK_OF(OPENSSL_BLOCK) *safes, i2d_of_void *i2d,
     86 			     unsigned char **buf, int *len)
     87 {
     88 	int safelen;
     89 	unsigned char *safe, *p;
     90 	if (!(safelen = i2d_ASN1_SET(safes, NULL, i2d, V_ASN1_SEQUENCE,
     91 					      V_ASN1_UNIVERSAL, IS_SEQUENCE))) {
     92 		ASN1err(ASN1_F_ASN1_SEQ_PACK,ASN1_R_ENCODE_ERROR);
     93 		return NULL;
     94 	}
     95 	if (!(safe = OPENSSL_malloc (safelen))) {
     96 		ASN1err(ASN1_F_ASN1_SEQ_PACK,ERR_R_MALLOC_FAILURE);
     97 		return NULL;
     98 	}
     99 	p = safe;
    100 	i2d_ASN1_SET(safes, &p, i2d, V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL,
    101 								 IS_SEQUENCE);
    102 	if (len) *len = safelen;
    103 	if (buf) *buf = safe;
    104 	return safe;
    105 }
    106 
    107 /* Extract an ASN1 object from an ASN1_STRING */
    108 
    109 void *ASN1_unpack_string(ASN1_STRING *oct, d2i_of_void *d2i)
    110 {
    111 	const unsigned char *p;
    112 	char *ret;
    113 
    114 	p = oct->data;
    115 	if(!(ret = d2i(NULL, &p, oct->length)))
    116 		ASN1err(ASN1_F_ASN1_UNPACK_STRING,ASN1_R_DECODE_ERROR);
    117 	return ret;
    118 }
    119 
    120 /* Pack an ASN1 object into an ASN1_STRING */
    121 
    122 ASN1_STRING *ASN1_pack_string(void *obj, i2d_of_void *i2d, ASN1_STRING **oct)
    123 {
    124 	unsigned char *p;
    125 	ASN1_STRING *octmp;
    126 
    127 	if (!oct || !*oct) {
    128 		if (!(octmp = ASN1_STRING_new ())) {
    129 			ASN1err(ASN1_F_ASN1_PACK_STRING,ERR_R_MALLOC_FAILURE);
    130 			return NULL;
    131 		}
    132 		if (oct) *oct = octmp;
    133 	} else octmp = *oct;
    134 
    135 	if (!(octmp->length = i2d(obj, NULL))) {
    136 		ASN1err(ASN1_F_ASN1_PACK_STRING,ASN1_R_ENCODE_ERROR);
    137 		goto err;
    138 	}
    139 	if (!(p = OPENSSL_malloc (octmp->length))) {
    140 		ASN1err(ASN1_F_ASN1_PACK_STRING,ERR_R_MALLOC_FAILURE);
    141 		goto err;
    142 	}
    143 	octmp->data = p;
    144 	i2d (obj, &p);
    145 	return octmp;
    146 	err:
    147 	if (!oct || !*oct)
    148 		{
    149 		ASN1_STRING_free(octmp);
    150 		if (oct)
    151 			*oct = NULL;
    152 		}
    153 	return NULL;
    154 }
    155 
    156 #endif
    157 
    158 /* ASN1_ITEM versions of the above */
    159 
    160 ASN1_STRING *ASN1_item_pack(void *obj, const ASN1_ITEM *it, ASN1_STRING **oct)
    161 {
    162 	ASN1_STRING *octmp;
    163 
    164 	if (!oct || !*oct) {
    165 		if (!(octmp = ASN1_STRING_new ())) {
    166 			ASN1err(ASN1_F_ASN1_ITEM_PACK,ERR_R_MALLOC_FAILURE);
    167 			return NULL;
    168 		}
    169 		if (oct) *oct = octmp;
    170 	} else octmp = *oct;
    171 
    172 	if(octmp->data) {
    173 		OPENSSL_free(octmp->data);
    174 		octmp->data = NULL;
    175 	}
    176 
    177 	if (!(octmp->length = ASN1_item_i2d(obj, &octmp->data, it))) {
    178 		ASN1err(ASN1_F_ASN1_ITEM_PACK,ASN1_R_ENCODE_ERROR);
    179 		return NULL;
    180 	}
    181 	if (!octmp->data) {
    182 		ASN1err(ASN1_F_ASN1_ITEM_PACK,ERR_R_MALLOC_FAILURE);
    183 		return NULL;
    184 	}
    185 	return octmp;
    186 }
    187 
    188 /* Extract an ASN1 object from an ASN1_STRING */
    189 
    190 void *ASN1_item_unpack(ASN1_STRING *oct, const ASN1_ITEM *it)
    191 {
    192 	const unsigned char *p;
    193 	void *ret;
    194 
    195 	p = oct->data;
    196 	if(!(ret = ASN1_item_d2i(NULL, &p, oct->length, it)))
    197 		ASN1err(ASN1_F_ASN1_ITEM_UNPACK,ASN1_R_DECODE_ERROR);
    198 	return ret;
    199 }
    200