f_int.c revision 296465 
1/* crypto/asn1/f_int.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
64int i2a_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *a)
65{
66    int i, n = 0;
67    static const char *h = "0123456789ABCDEF";
68    char buf[2];
69
70    if (a == NULL)
71        return (0);
72
73    if (a->type & V_ASN1_NEG) {
74        if (BIO_write(bp, "-", 1) != 1)
75            goto err;
76        n = 1;
77    }
78
79    if (a->length == 0) {
80        if (BIO_write(bp, "00", 2) != 2)
81            goto err;
82        n += 2;
83    } else {
84        for (i = 0; i < a->length; i++) {
85            if ((i != 0) && (i % 35 == 0)) {
86                if (BIO_write(bp, "\\\n", 2) != 2)
87                    goto err;
88                n += 2;
89            }
90            buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f];
91            buf[1] = h[((unsigned char)a->data[i]) & 0x0f];
92            if (BIO_write(bp, buf, 2) != 2)
93                goto err;
94            n += 2;
95        }
96    }
97    return (n);
98 err:
99    return (-1);
100}
101
102int a2i_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *bs, char *buf, int size)
103{
104    int ret = 0;
105    int i, j, k, m, n, again, bufsize;
106    unsigned char *s = NULL, *sp;
107    unsigned char *bufp;
108    int num = 0, slen = 0, first = 1;
109
110    bs->type = V_ASN1_INTEGER;
111
112    bufsize = BIO_gets(bp, buf, size);
113    for (;;) {
114        if (bufsize < 1)
115            goto err_sl;
116        i = bufsize;
117        if (buf[i - 1] == '\n')
118            buf[--i] = '\0';
119        if (i == 0)
120            goto err_sl;
121        if (buf[i - 1] == '\r')
122            buf[--i] = '\0';
123        if (i == 0)
124            goto err_sl;
125        again = (buf[i - 1] == '\\');
126
127        for (j = 0; j < i; j++) {
128#ifndef CHARSET_EBCDIC
129            if (!(((buf[j] >= '0') && (buf[j] <= '9')) ||
130                  ((buf[j] >= 'a') && (buf[j] <= 'f')) ||
131                  ((buf[j] >= 'A') && (buf[j] <= 'F'))))
132#else
133            /*
134             * This #ifdef is not strictly necessary, since the characters
135             * A...F a...f 0...9 are contiguous (yes, even in EBCDIC - but
136             * not the whole alphabet). Nevertheless, isxdigit() is faster.
137             */
138            if (!isxdigit(buf[j]))
139#endif
140            {
141                i = j;
142                break;
143            }
144        }
145        buf[i] = '\0';
146        /*
147         * We have now cleared all the crap off the end of the line
148         */
149        if (i < 2)
150            goto err_sl;
151
152        bufp = (unsigned char *)buf;
153        if (first) {
154            first = 0;
155            if ((bufp[0] == '0') && (buf[1] == '0')) {
156                bufp += 2;
157                i -= 2;
158            }
159        }
160        k = 0;
161        i -= again;
162        if (i % 2 != 0) {
163            ASN1err(ASN1_F_A2I_ASN1_INTEGER, ASN1_R_ODD_NUMBER_OF_CHARS);
164            goto err;
165        }
166        i /= 2;
167        if (num + i > slen) {
168            if (s == NULL)
169                sp = (unsigned char *)OPENSSL_malloc((unsigned int)num +
170                                                     i * 2);
171            else
172                sp = OPENSSL_realloc_clean(s, slen, num + i * 2);
173            if (sp == NULL) {
174                ASN1err(ASN1_F_A2I_ASN1_INTEGER, ERR_R_MALLOC_FAILURE);
175                if (s != NULL)
176                    OPENSSL_free(s);
177                goto err;
178            }
179            s = sp;
180            slen = num + i * 2;
181        }
182        for (j = 0; j < i; j++, k += 2) {
183            for (n = 0; n < 2; n++) {
184                m = bufp[k + n];
185                if ((m >= '0') && (m <= '9'))
186                    m -= '0';
187                else if ((m >= 'a') && (m <= 'f'))
188                    m = m - 'a' + 10;
189                else if ((m >= 'A') && (m <= 'F'))
190                    m = m - 'A' + 10;
191                else {
192                    ASN1err(ASN1_F_A2I_ASN1_INTEGER,
193                            ASN1_R_NON_HEX_CHARACTERS);
194                    goto err;
195                }
196                s[num + j] <<= 4;
197                s[num + j] |= m;
198            }
199        }
200        num += i;
201        if (again)
202            bufsize = BIO_gets(bp, buf, size);
203        else
204            break;
205    }
206    bs->length = num;
207    bs->data = s;
208    ret = 1;
209 err:
210    if (0) {
211 err_sl:
212        ASN1err(ASN1_F_A2I_ASN1_INTEGER, ASN1_R_SHORT_LINE);
213    }
214    return (ret);
215}
216