a_enum.c revision 296465 
1/* crypto/asn1/a_enum.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/bn.h>
63
64/*
65 * Code for ENUMERATED type: identical to INTEGER apart from a different tag.
66 * for comments on encoding see a_int.c
67 */
68
69int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v)
70{
71    int j, k;
72    unsigned int i;
73    unsigned char buf[sizeof(long) + 1];
74    long d;
75
76    a->type = V_ASN1_ENUMERATED;
77    if (a->length < (int)(sizeof(long) + 1)) {
78        if (a->data != NULL)
79            OPENSSL_free(a->data);
80        if ((a->data =
81             (unsigned char *)OPENSSL_malloc(sizeof(long) + 1)) != NULL)
82            memset((char *)a->data, 0, sizeof(long) + 1);
83    }
84    if (a->data == NULL) {
85        ASN1err(ASN1_F_ASN1_ENUMERATED_SET, ERR_R_MALLOC_FAILURE);
86        return (0);
87    }
88    d = v;
89    if (d < 0) {
90        d = -d;
91        a->type = V_ASN1_NEG_ENUMERATED;
92    }
93
94    for (i = 0; i < sizeof(long); i++) {
95        if (d == 0)
96            break;
97        buf[i] = (int)d & 0xff;
98        d >>= 8;
99    }
100    j = 0;
101    for (k = i - 1; k >= 0; k--)
102        a->data[j++] = buf[k];
103    a->length = j;
104    return (1);
105}
106
107long ASN1_ENUMERATED_get(ASN1_ENUMERATED *a)
108{
109    int neg = 0, i;
110    long r = 0;
111
112    if (a == NULL)
113        return (0L);
114    i = a->type;
115    if (i == V_ASN1_NEG_ENUMERATED)
116        neg = 1;
117    else if (i != V_ASN1_ENUMERATED)
118        return -1;
119
120    if (a->length > (int)sizeof(long)) {
121        /* hmm... a bit ugly */
122        return (0xffffffffL);
123    }
124    if (a->data == NULL)
125        return 0;
126
127    for (i = 0; i < a->length; i++) {
128        r <<= 8;
129        r |= (unsigned char)a->data[i];
130    }
131    if (neg)
132        r = -r;
133    return (r);
134}
135
136ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(BIGNUM *bn, ASN1_ENUMERATED *ai)
137{
138    ASN1_ENUMERATED *ret;
139    int len, j;
140
141    if (ai == NULL)
142        ret = M_ASN1_ENUMERATED_new();
143    else
144        ret = ai;
145    if (ret == NULL) {
146        ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED, ERR_R_NESTED_ASN1_ERROR);
147        goto err;
148    }
149    if (BN_is_negative(bn))
150        ret->type = V_ASN1_NEG_ENUMERATED;
151    else
152        ret->type = V_ASN1_ENUMERATED;
153    j = BN_num_bits(bn);
154    len = ((j == 0) ? 0 : ((j / 8) + 1));
155    if (ret->length < len + 4) {
156        unsigned char *new_data = OPENSSL_realloc(ret->data, len + 4);
157        if (!new_data) {
158            ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED, ERR_R_MALLOC_FAILURE);
159            goto err;
160        }
161        ret->data = new_data;
162    }
163
164    ret->length = BN_bn2bin(bn, ret->data);
165    return (ret);
166 err:
167    if (ret != ai)
168        M_ASN1_ENUMERATED_free(ret);
169    return (NULL);
170}
171
172BIGNUM *ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED *ai, BIGNUM *bn)
173{
174    BIGNUM *ret;
175
176    if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL)
177        ASN1err(ASN1_F_ASN1_ENUMERATED_TO_BN, ASN1_R_BN_LIB);
178    else if (ai->type == V_ASN1_NEG_ENUMERATED)
179        BN_set_negative(ret, 1);
180    return (ret);
181}
182