asn_pack.c revision 296465 
1/* asn_pack.c */
2/*
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
4 * 1999.
5 */
6/* ====================================================================
7 * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in
18 *    the documentation and/or other materials provided with the
19 *    distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 *    software must display the following acknowledgment:
23 *    "This product includes software developed by the OpenSSL Project
24 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 *    endorse or promote products derived from this software without
28 *    prior written permission. For written permission, please contact
29 *    licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 *    nor may "OpenSSL" appear in their names without prior written
33 *    permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 *    acknowledgment:
37 *    "This product includes software developed by the OpenSSL Project
38 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com).  This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59
60#include <stdio.h>
61#include "cryptlib.h"
62#include <openssl/asn1.h>
63
64#ifndef NO_ASN1_OLD
65
66/* ASN1 packing and unpacking functions */
67
68/* Turn an ASN1 encoded SEQUENCE OF into a STACK of structures */
69
70STACK *ASN1_seq_unpack(const unsigned char *buf, int len,
71                       d2i_of_void *d2i, void (*free_func) (void *))
72{
73    STACK *sk;
74    const unsigned char *pbuf;
75    pbuf = buf;
76    if (!(sk = d2i_ASN1_SET(NULL, &pbuf, len, d2i, free_func,
77                            V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL)))
78        ASN1err(ASN1_F_ASN1_SEQ_UNPACK, ASN1_R_DECODE_ERROR);
79    return sk;
80}
81
82/*
83 * Turn a STACK structures into an ASN1 encoded SEQUENCE OF structure in a
84 * OPENSSL_malloc'ed buffer
85 */
86
87unsigned char *ASN1_seq_pack(STACK * safes, i2d_of_void *i2d,
88                             unsigned char **buf, int *len)
89{
90    int safelen;
91    unsigned char *safe, *p;
92    if (!(safelen = i2d_ASN1_SET(safes, NULL, i2d, V_ASN1_SEQUENCE,
93                                 V_ASN1_UNIVERSAL, IS_SEQUENCE))) {
94        ASN1err(ASN1_F_ASN1_SEQ_PACK, ASN1_R_ENCODE_ERROR);
95        return NULL;
96    }
97    if (!(safe = OPENSSL_malloc(safelen))) {
98        ASN1err(ASN1_F_ASN1_SEQ_PACK, ERR_R_MALLOC_FAILURE);
99        return NULL;
100    }
101    p = safe;
102    i2d_ASN1_SET(safes, &p, i2d, V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL,
103                 IS_SEQUENCE);
104    if (len)
105        *len = safelen;
106    if (buf)
107        *buf = safe;
108    return safe;
109}
110
111/* Extract an ASN1 object from an ASN1_STRING */
112
113void *ASN1_unpack_string(ASN1_STRING *oct, d2i_of_void *d2i)
114{
115    const unsigned char *p;
116    char *ret;
117
118    p = oct->data;
119    if (!(ret = d2i(NULL, &p, oct->length)))
120        ASN1err(ASN1_F_ASN1_UNPACK_STRING, ASN1_R_DECODE_ERROR);
121    return ret;
122}
123
124/* Pack an ASN1 object into an ASN1_STRING */
125
126ASN1_STRING *ASN1_pack_string(void *obj, i2d_of_void *i2d, ASN1_STRING **oct)
127{
128    unsigned char *p;
129    ASN1_STRING *octmp;
130
131    if (!oct || !*oct) {
132        if (!(octmp = ASN1_STRING_new())) {
133            ASN1err(ASN1_F_ASN1_PACK_STRING, ERR_R_MALLOC_FAILURE);
134            return NULL;
135        }
136        if (oct)
137            *oct = octmp;
138    } else
139        octmp = *oct;
140
141    if (!(octmp->length = i2d(obj, NULL))) {
142        ASN1err(ASN1_F_ASN1_PACK_STRING, ASN1_R_ENCODE_ERROR);
143        goto err;
144    }
145    if (!(p = OPENSSL_malloc(octmp->length))) {
146        ASN1err(ASN1_F_ASN1_PACK_STRING, ERR_R_MALLOC_FAILURE);
147        goto err;
148    }
149    octmp->data = p;
150    i2d(obj, &p);
151    return octmp;
152 err:
153    if (!oct || !*oct) {
154        ASN1_STRING_free(octmp);
155        if (oct)
156            *oct = NULL;
157    }
158    return NULL;
159}
160
161#endif
162
163/* ASN1_ITEM versions of the above */
164
165ASN1_STRING *ASN1_item_pack(void *obj, const ASN1_ITEM *it, ASN1_STRING **oct)
166{
167    ASN1_STRING *octmp;
168
169    if (!oct || !*oct) {
170        if (!(octmp = ASN1_STRING_new())) {
171            ASN1err(ASN1_F_ASN1_ITEM_PACK, ERR_R_MALLOC_FAILURE);
172            return NULL;
173        }
174        if (oct)
175            *oct = octmp;
176    } else
177        octmp = *oct;
178
179    if (octmp->data) {
180        OPENSSL_free(octmp->data);
181        octmp->data = NULL;
182    }
183
184    if (!(octmp->length = ASN1_item_i2d(obj, &octmp->data, it))) {
185        ASN1err(ASN1_F_ASN1_ITEM_PACK, ASN1_R_ENCODE_ERROR);
186        return NULL;
187    }
188    if (!octmp->data) {
189        ASN1err(ASN1_F_ASN1_ITEM_PACK, ERR_R_MALLOC_FAILURE);
190        return NULL;
191    }
192    return octmp;
193}
194
195/* Extract an ASN1 object from an ASN1_STRING */
196
197void *ASN1_item_unpack(ASN1_STRING *oct, const ASN1_ITEM *it)
198{
199    const unsigned char *p;
200    void *ret;
201
202    p = oct->data;
203    if (!(ret = ASN1_item_d2i(NULL, &p, oct->length, it)))
204        ASN1err(ASN1_F_ASN1_ITEM_UNPACK, ASN1_R_DECODE_ERROR);
205    return ret;
206}
207