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 
ASN1_seq_unpack(const unsigned char * buf,int len,d2i_of_void * d2i,void (* free_func)(void *))70 STACK *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 
ASN1_seq_pack(STACK * safes,i2d_of_void * i2d,unsigned char ** buf,int * len)87 unsigned 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 
ASN1_unpack_string(ASN1_STRING * oct,d2i_of_void * d2i)113 void *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 
ASN1_pack_string(void * obj,i2d_of_void * i2d,ASN1_STRING ** oct)126 ASN1_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 
ASN1_item_pack(void * obj,const ASN1_ITEM * it,ASN1_STRING ** oct)165 ASN1_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 
ASN1_item_unpack(ASN1_STRING * oct,const ASN1_ITEM * it)197 void *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