evp_asn1.c revision 296465 
1/* crypto/asn1/evp_asn1.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to.  The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 *    notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 *    notice, this list of conditions and the following disclaimer in the
30 *    documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 *    must display the following acknowledgement:
33 *    "This product includes cryptographic software written by
34 *     Eric Young (eay@cryptsoft.com)"
35 *    The word 'cryptographic' can be left out if the rouines from the library
36 *    being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 *    the apps directory (application code) you must include an acknowledgement:
39 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed.  i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59#include <stdio.h>
60#include "cryptlib.h"
61#include <openssl/asn1.h>
62#include <openssl/asn1_mac.h>
63
64int ASN1_TYPE_set_octetstring(ASN1_TYPE *a, unsigned char *data, int len)
65{
66    ASN1_STRING *os;
67
68    if ((os = M_ASN1_OCTET_STRING_new()) == NULL)
69        return (0);
70    if (!M_ASN1_OCTET_STRING_set(os, data, len)) {
71        M_ASN1_OCTET_STRING_free(os);
72        return 0;
73    }
74    ASN1_TYPE_set(a, V_ASN1_OCTET_STRING, os);
75    return (1);
76}
77
78/* int max_len:  for returned value    */
79int ASN1_TYPE_get_octetstring(ASN1_TYPE *a, unsigned char *data, int max_len)
80{
81    int ret, num;
82    unsigned char *p;
83
84    if ((a->type != V_ASN1_OCTET_STRING) || (a->value.octet_string == NULL)) {
85        ASN1err(ASN1_F_ASN1_TYPE_GET_OCTETSTRING, ASN1_R_DATA_IS_WRONG);
86        return (-1);
87    }
88    p = M_ASN1_STRING_data(a->value.octet_string);
89    ret = M_ASN1_STRING_length(a->value.octet_string);
90    if (ret < max_len)
91        num = ret;
92    else
93        num = max_len;
94    memcpy(data, p, num);
95    return (ret);
96}
97
98int ASN1_TYPE_set_int_octetstring(ASN1_TYPE *a, long num, unsigned char *data,
99                                  int len)
100{
101    int n, size;
102    ASN1_OCTET_STRING os, *osp;
103    ASN1_INTEGER in;
104    unsigned char *p;
105    unsigned char buf[32];      /* when they have 256bit longs, I'll be in
106                                 * trouble */
107    in.data = buf;
108    in.length = 32;
109    os.data = data;
110    os.type = V_ASN1_OCTET_STRING;
111    os.length = len;
112    ASN1_INTEGER_set(&in, num);
113    n = i2d_ASN1_INTEGER(&in, NULL);
114    n += M_i2d_ASN1_OCTET_STRING(&os, NULL);
115
116    size = ASN1_object_size(1, n, V_ASN1_SEQUENCE);
117
118    if ((osp = ASN1_STRING_new()) == NULL)
119        return (0);
120    /* Grow the 'string' */
121    if (!ASN1_STRING_set(osp, NULL, size)) {
122        ASN1_STRING_free(osp);
123        return (0);
124    }
125
126    M_ASN1_STRING_length_set(osp, size);
127    p = M_ASN1_STRING_data(osp);
128
129    ASN1_put_object(&p, 1, n, V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL);
130    i2d_ASN1_INTEGER(&in, &p);
131    M_i2d_ASN1_OCTET_STRING(&os, &p);
132
133    ASN1_TYPE_set(a, V_ASN1_SEQUENCE, osp);
134    return (1);
135}
136
137/*
138 * we return the actual length..., num may be missing, in which case, set it
139 * to zero
140 */
141/* int max_len:  for returned value    */
142int ASN1_TYPE_get_int_octetstring(ASN1_TYPE *a, long *num,
143                                  unsigned char *data, int max_len)
144{
145    int ret = -1, n;
146    ASN1_INTEGER *ai = NULL;
147    ASN1_OCTET_STRING *os = NULL;
148    const unsigned char *p;
149    long length;
150    ASN1_const_CTX c;
151
152    if ((a->type != V_ASN1_SEQUENCE) || (a->value.sequence == NULL)) {
153        goto err;
154    }
155    p = M_ASN1_STRING_data(a->value.sequence);
156    length = M_ASN1_STRING_length(a->value.sequence);
157
158    c.pp = &p;
159    c.p = p;
160    c.max = p + length;
161    c.error = ASN1_R_DATA_IS_WRONG;
162
163    M_ASN1_D2I_start_sequence();
164    c.q = c.p;
165    if ((ai = d2i_ASN1_INTEGER(NULL, &c.p, c.slen)) == NULL)
166        goto err;
167    c.slen -= (c.p - c.q);
168    c.q = c.p;
169    if ((os = d2i_ASN1_OCTET_STRING(NULL, &c.p, c.slen)) == NULL)
170        goto err;
171    c.slen -= (c.p - c.q);
172    if (!M_ASN1_D2I_end_sequence())
173        goto err;
174
175    if (num != NULL)
176        *num = ASN1_INTEGER_get(ai);
177
178    ret = M_ASN1_STRING_length(os);
179    if (max_len > ret)
180        n = ret;
181    else
182        n = max_len;
183
184    if (data != NULL)
185        memcpy(data, M_ASN1_STRING_data(os), n);
186    if (0) {
187 err:
188        ASN1err(ASN1_F_ASN1_TYPE_GET_INT_OCTETSTRING, ASN1_R_DATA_IS_WRONG);
189    }
190    if (os != NULL)
191        M_ASN1_OCTET_STRING_free(os);
192    if (ai != NULL)
193        M_ASN1_INTEGER_free(ai);
194    return (ret);
195}
196