asn_pack.c revision 296341 
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_OF(OPENSSL_BLOCK) *ASN1_seq_unpack(const unsigned char *buf, int len,
71                                         d2i_of_void *d2i,
72                                         void (*free_func) (OPENSSL_BLOCK))
73{
74    STACK_OF(OPENSSL_BLOCK) *sk;
75    const unsigned char *pbuf;
76    pbuf = buf;
77    if (!(sk = d2i_ASN1_SET(NULL, &pbuf, len, d2i, free_func,
78                            V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL)))
79        ASN1err(ASN1_F_ASN1_SEQ_UNPACK, ASN1_R_DECODE_ERROR);
80    return sk;
81}
82
83/*
84 * Turn a STACK structures into an ASN1 encoded SEQUENCE OF structure in a
85 * OPENSSL_malloc'ed buffer
86 */
87
88unsigned char *ASN1_seq_pack(STACK_OF(OPENSSL_BLOCK) *safes, i2d_of_void *i2d,
89                             unsigned char **buf, int *len)
90{
91    int safelen;
92    unsigned char *safe, *p;
93    if (!(safelen = i2d_ASN1_SET(safes, NULL, i2d, V_ASN1_SEQUENCE,
94                                 V_ASN1_UNIVERSAL, IS_SEQUENCE))) {
95        ASN1err(ASN1_F_ASN1_SEQ_PACK, ASN1_R_ENCODE_ERROR);
96        return NULL;
97    }
98    if (!(safe = OPENSSL_malloc(safelen))) {
99        ASN1err(ASN1_F_ASN1_SEQ_PACK, ERR_R_MALLOC_FAILURE);
100        return NULL;
101    }
102    p = safe;
103    i2d_ASN1_SET(safes, &p, i2d, V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL,
104                 IS_SEQUENCE);
105    if (len)
106        *len = safelen;
107    if (buf)
108        *buf = safe;
109    return safe;
110}
111
112/* Extract an ASN1 object from an ASN1_STRING */
113
114void *ASN1_unpack_string(ASN1_STRING *oct, d2i_of_void *d2i)
115{
116    const unsigned char *p;
117    char *ret;
118
119    p = oct->data;
120    if (!(ret = d2i(NULL, &p, oct->length)))
121        ASN1err(ASN1_F_ASN1_UNPACK_STRING, ASN1_R_DECODE_ERROR);
122    return ret;
123}
124
125/* Pack an ASN1 object into an ASN1_STRING */
126
127ASN1_STRING *ASN1_pack_string(void *obj, i2d_of_void *i2d, ASN1_STRING **oct)
128{
129    unsigned char *p;
130    ASN1_STRING *octmp;
131
132    if (!oct || !*oct) {
133        if (!(octmp = ASN1_STRING_new())) {
134            ASN1err(ASN1_F_ASN1_PACK_STRING, ERR_R_MALLOC_FAILURE);
135            return NULL;
136        }
137        if (oct)
138            *oct = octmp;
139    } else
140        octmp = *oct;
141
142    if (!(octmp->length = i2d(obj, NULL))) {
143        ASN1err(ASN1_F_ASN1_PACK_STRING, ASN1_R_ENCODE_ERROR);
144        goto err;
145    }
146    if (!(p = OPENSSL_malloc(octmp->length))) {
147        ASN1err(ASN1_F_ASN1_PACK_STRING, ERR_R_MALLOC_FAILURE);
148        goto err;
149    }
150    octmp->data = p;
151    i2d(obj, &p);
152    return octmp;
153 err:
154    if (!oct || !*oct) {
155        ASN1_STRING_free(octmp);
156        if (oct)
157            *oct = NULL;
158    }
159    return NULL;
160}
161
162#endif
163
164/* ASN1_ITEM versions of the above */
165
166ASN1_STRING *ASN1_item_pack(void *obj, const ASN1_ITEM *it, ASN1_STRING **oct)
167{
168    ASN1_STRING *octmp;
169
170    if (!oct || !*oct) {
171        if (!(octmp = ASN1_STRING_new())) {
172            ASN1err(ASN1_F_ASN1_ITEM_PACK, ERR_R_MALLOC_FAILURE);
173            return NULL;
174        }
175        if (oct)
176            *oct = octmp;
177    } else
178        octmp = *oct;
179
180    if (octmp->data) {
181        OPENSSL_free(octmp->data);
182        octmp->data = NULL;
183    }
184
185    if (!(octmp->length = ASN1_item_i2d(obj, &octmp->data, it))) {
186        ASN1err(ASN1_F_ASN1_ITEM_PACK, ASN1_R_ENCODE_ERROR);
187        return NULL;
188    }
189    if (!octmp->data) {
190        ASN1err(ASN1_F_ASN1_ITEM_PACK, ERR_R_MALLOC_FAILURE);
191        return NULL;
192    }
193    return octmp;
194}
195
196/* Extract an ASN1 object from an ASN1_STRING */
197
198void *ASN1_item_unpack(ASN1_STRING *oct, const ASN1_ITEM *it)
199{
200    const unsigned char *p;
201    void *ret;
202
203    p = oct->data;
204    if (!(ret = ASN1_item_d2i(NULL, &p, oct->length, it)))
205        ASN1err(ASN1_F_ASN1_ITEM_UNPACK, ASN1_R_DECODE_ERROR);
206    return ret;
207}
208