f_enum.c revision 296465 
1/* crypto/asn1/f_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/buffer.h>
62#include <openssl/asn1.h>
63
64/* Based on a_int.c: equivalent ENUMERATED functions */
65
66int i2a_ASN1_ENUMERATED(BIO *bp, ASN1_ENUMERATED *a)
67{
68    int i, n = 0;
69    static const char *h = "0123456789ABCDEF";
70    char buf[2];
71
72    if (a == NULL)
73        return (0);
74
75    if (a->length == 0) {
76        if (BIO_write(bp, "00", 2) != 2)
77            goto err;
78        n = 2;
79    } else {
80        for (i = 0; i < a->length; i++) {
81            if ((i != 0) && (i % 35 == 0)) {
82                if (BIO_write(bp, "\\\n", 2) != 2)
83                    goto err;
84                n += 2;
85            }
86            buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f];
87            buf[1] = h[((unsigned char)a->data[i]) & 0x0f];
88            if (BIO_write(bp, buf, 2) != 2)
89                goto err;
90            n += 2;
91        }
92    }
93    return (n);
94 err:
95    return (-1);
96}
97
98int a2i_ASN1_ENUMERATED(BIO *bp, ASN1_ENUMERATED *bs, char *buf, int size)
99{
100    int ret = 0;
101    int i, j, k, m, n, again, bufsize;
102    unsigned char *s = NULL, *sp;
103    unsigned char *bufp;
104    int num = 0, slen = 0, first = 1;
105
106    bs->type = V_ASN1_ENUMERATED;
107
108    bufsize = BIO_gets(bp, buf, size);
109    for (;;) {
110        if (bufsize < 1)
111            goto err_sl;
112        i = bufsize;
113        if (buf[i - 1] == '\n')
114            buf[--i] = '\0';
115        if (i == 0)
116            goto err_sl;
117        if (buf[i - 1] == '\r')
118            buf[--i] = '\0';
119        if (i == 0)
120            goto err_sl;
121        again = (buf[i - 1] == '\\');
122
123        for (j = 0; j < i; j++) {
124            if (!(((buf[j] >= '0') && (buf[j] <= '9')) ||
125                  ((buf[j] >= 'a') && (buf[j] <= 'f')) ||
126                  ((buf[j] >= 'A') && (buf[j] <= 'F')))) {
127                i = j;
128                break;
129            }
130        }
131        buf[i] = '\0';
132        /*
133         * We have now cleared all the crap off the end of the line
134         */
135        if (i < 2)
136            goto err_sl;
137
138        bufp = (unsigned char *)buf;
139        if (first) {
140            first = 0;
141            if ((bufp[0] == '0') && (buf[1] == '0')) {
142                bufp += 2;
143                i -= 2;
144            }
145        }
146        k = 0;
147        i -= again;
148        if (i % 2 != 0) {
149            ASN1err(ASN1_F_A2I_ASN1_ENUMERATED, ASN1_R_ODD_NUMBER_OF_CHARS);
150            goto err;
151        }
152        i /= 2;
153        if (num + i > slen) {
154            if (s == NULL)
155                sp = (unsigned char *)OPENSSL_malloc((unsigned int)num +
156                                                     i * 2);
157            else
158                sp = (unsigned char *)OPENSSL_realloc(s,
159                                                      (unsigned int)num +
160                                                      i * 2);
161            if (sp == NULL) {
162                ASN1err(ASN1_F_A2I_ASN1_ENUMERATED, ERR_R_MALLOC_FAILURE);
163                if (s != NULL)
164                    OPENSSL_free(s);
165                goto err;
166            }
167            s = sp;
168            slen = num + i * 2;
169        }
170        for (j = 0; j < i; j++, k += 2) {
171            for (n = 0; n < 2; n++) {
172                m = bufp[k + n];
173                if ((m >= '0') && (m <= '9'))
174                    m -= '0';
175                else if ((m >= 'a') && (m <= 'f'))
176                    m = m - 'a' + 10;
177                else if ((m >= 'A') && (m <= 'F'))
178                    m = m - 'A' + 10;
179                else {
180                    ASN1err(ASN1_F_A2I_ASN1_ENUMERATED,
181                            ASN1_R_NON_HEX_CHARACTERS);
182                    goto err;
183                }
184                s[num + j] <<= 4;
185                s[num + j] |= m;
186            }
187        }
188        num += i;
189        if (again)
190            bufsize = BIO_gets(bp, buf, size);
191        else
192            break;
193    }
194    bs->length = num;
195    bs->data = s;
196    ret = 1;
197 err:
198    if (0) {
199 err_sl:
200        ASN1err(ASN1_F_A2I_ASN1_ENUMERATED, ASN1_R_SHORT_LINE);
201    }
202    return (ret);
203}
204