asn_pack.c revision 55714 
1/* asn_pack.c */
2/* Written by Dr Stephen N Henson (shenson@bigfoot.com) 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@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@cryptsoft.com).  This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59#include <stdio.h>
60#include "cryptlib.h"
61#include <openssl/asn1.h>
62
63/* ASN1 packing and unpacking functions */
64
65/* Turn an ASN1 encoded SEQUENCE OF into a STACK of structures */
66
67STACK *ASN1_seq_unpack(unsigned char *buf, int len, char *(*d2i)(),
68	     void (*free_func)())
69{
70    STACK *sk;
71    unsigned char *pbuf;
72    pbuf =  buf;
73    if (!(sk = d2i_ASN1_SET(NULL, &pbuf, len, d2i, free_func,
74					V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL)))
75		 ASN1err(ASN1_F_ASN1_SEQ_UNPACK,ASN1_R_DECODE_ERROR);
76    return sk;
77}
78
79/* Turn a STACK structures into an ASN1 encoded SEQUENCE OF structure in a
80 * Malloc'ed buffer
81 */
82
83unsigned char *ASN1_seq_pack(STACK *safes, int (*i2d)(), unsigned char **buf,
84	     int *len)
85{
86	int safelen;
87	unsigned char *safe, *p;
88	if (!(safelen = i2d_ASN1_SET(safes, NULL, i2d, V_ASN1_SEQUENCE,
89					      V_ASN1_UNIVERSAL, IS_SEQUENCE))) {
90		ASN1err(ASN1_F_ASN1_SEQ_PACK,ASN1_R_ENCODE_ERROR);
91		return NULL;
92	}
93	if (!(safe = Malloc (safelen))) {
94		ASN1err(ASN1_F_ASN1_SEQ_PACK,ERR_R_MALLOC_FAILURE);
95		return NULL;
96	}
97	p = safe;
98	i2d_ASN1_SET(safes, &p, i2d, V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL,
99								 IS_SEQUENCE);
100	if (len) *len = safelen;
101	if (buf) *buf = safe;
102	return safe;
103}
104
105/* Extract an ASN1 object from an ASN1_STRING */
106
107void *ASN1_unpack_string (ASN1_STRING *oct, char *(*d2i)())
108{
109	unsigned char *p;
110	char *ret;
111
112	p = oct->data;
113	if(!(ret = d2i(NULL, &p, oct->length)))
114		ASN1err(ASN1_F_ASN1_UNPACK_STRING,ASN1_R_DECODE_ERROR);
115	return ret;
116}
117
118/* Pack an ASN1 object into an ASN1_STRING */
119
120ASN1_STRING *ASN1_pack_string (void *obj, int (*i2d)(), ASN1_STRING **oct)
121{
122	unsigned char *p;
123	ASN1_STRING *octmp;
124
125	if (!oct || !*oct) {
126		if (!(octmp = ASN1_STRING_new ())) {
127			ASN1err(ASN1_F_ASN1_PACK_STRING,ERR_R_MALLOC_FAILURE);
128			return NULL;
129		}
130		if (oct) *oct = octmp;
131	} else octmp = *oct;
132
133	if (!(octmp->length = i2d(obj, NULL))) {
134		ASN1err(ASN1_F_ASN1_PACK_STRING,ASN1_R_ENCODE_ERROR);
135		return NULL;
136	}
137	if (!(p = Malloc (octmp->length))) {
138		ASN1err(ASN1_F_ASN1_PACK_STRING,ERR_R_MALLOC_FAILURE);
139		return NULL;
140	}
141	octmp->data = p;
142	i2d (obj, &p);
143	return octmp;
144}
145
146