1/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to.  The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 *    notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 *    notice, this list of conditions and the following disclaimer in the
29 *    documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 *    must display the following acknowledgement:
32 *    "This product includes cryptographic software written by
33 *     Eric Young (eay@cryptsoft.com)"
34 *    The word 'cryptographic' can be left out if the rouines from the library
35 *    being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 *    the apps directory (application code) you must include an acknowledgement:
38 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed.  i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57#include <openssl/asn1.h>
58
59#include <limits.h>
60#include <string.h>
61
62#include <openssl/err.h>
63#include <openssl/mem.h>
64
65#include "../internal.h"
66
67
68/*
69 * Code for ENUMERATED type: identical to INTEGER apart from a different tag.
70 * for comments on encoding see a_int.c
71 */
72
73int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v)
74{
75    int j, k;
76    unsigned int i;
77    unsigned char buf[sizeof(long) + 1];
78    long d;
79
80    a->type = V_ASN1_ENUMERATED;
81    if (a->length < (int)(sizeof(long) + 1)) {
82        if (a->data != NULL)
83            OPENSSL_free(a->data);
84        if ((a->data =
85             (unsigned char *)OPENSSL_malloc(sizeof(long) + 1)) != NULL)
86            OPENSSL_memset((char *)a->data, 0, sizeof(long) + 1);
87    }
88    if (a->data == NULL) {
89        OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
90        return (0);
91    }
92    d = v;
93    if (d < 0) {
94        d = -d;
95        a->type = V_ASN1_NEG_ENUMERATED;
96    }
97
98    for (i = 0; i < sizeof(long); i++) {
99        if (d == 0)
100            break;
101        buf[i] = (int)d & 0xff;
102        d >>= 8;
103    }
104    j = 0;
105    for (k = i - 1; k >= 0; k--)
106        a->data[j++] = buf[k];
107    a->length = j;
108    return (1);
109}
110
111long ASN1_ENUMERATED_get(ASN1_ENUMERATED *a)
112{
113    int neg = 0, i;
114
115    if (a == NULL)
116        return (0L);
117    i = a->type;
118    if (i == V_ASN1_NEG_ENUMERATED)
119        neg = 1;
120    else if (i != V_ASN1_ENUMERATED)
121        return -1;
122
123    OPENSSL_COMPILE_ASSERT(sizeof(uint64_t) >= sizeof(long),
124                           long_larger_than_uint64_t);
125
126    if (a->length > (int)sizeof(uint64_t)) {
127        /* hmm... a bit ugly */
128        return -1;
129    }
130
131    uint64_t r64 = 0;
132    if (a->data != NULL) {
133      for (i = 0; i < a->length; i++) {
134          r64 <<= 8;
135          r64 |= (unsigned char)a->data[i];
136      }
137
138      if (r64 > LONG_MAX) {
139          return -1;
140      }
141    }
142
143    long r = (long) r64;
144    if (neg)
145        r = -r;
146
147    return r;
148}
149
150ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(BIGNUM *bn, ASN1_ENUMERATED *ai)
151{
152    ASN1_ENUMERATED *ret;
153    int len, j;
154
155    if (ai == NULL)
156        ret = M_ASN1_ENUMERATED_new();
157    else
158        ret = ai;
159    if (ret == NULL) {
160        OPENSSL_PUT_ERROR(ASN1, ASN1_R_NESTED_ASN1_ERROR);
161        goto err;
162    }
163    if (BN_is_negative(bn))
164        ret->type = V_ASN1_NEG_ENUMERATED;
165    else
166        ret->type = V_ASN1_ENUMERATED;
167    j = BN_num_bits(bn);
168    len = ((j == 0) ? 0 : ((j / 8) + 1));
169    if (ret->length < len + 4) {
170        unsigned char *new_data = OPENSSL_realloc(ret->data, len + 4);
171        if (!new_data) {
172            OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
173            goto err;
174        }
175        ret->data = new_data;
176    }
177
178    ret->length = BN_bn2bin(bn, ret->data);
179    return (ret);
180 err:
181    if (ret != ai)
182        M_ASN1_ENUMERATED_free(ret);
183    return (NULL);
184}
185
186BIGNUM *ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED *ai, BIGNUM *bn)
187{
188    BIGNUM *ret;
189
190    if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL)
191        OPENSSL_PUT_ERROR(ASN1, ASN1_R_BN_LIB);
192    else if (ai->type == V_ASN1_NEG_ENUMERATED)
193        BN_set_negative(ret, 1);
194    return (ret);
195}
196