a_gentm.c revision 331638 
1/* crypto/asn1/a_gentm.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/*
60 * GENERALIZEDTIME implementation, written by Steve Henson. Based on UTCTIME
61 */
62
63#include <stdio.h>
64#include <time.h>
65#include "cryptlib.h"
66#include "o_time.h"
67#include <openssl/asn1.h>
68#include "asn1_locl.h"
69
70#if 0
71
72int i2d_ASN1_GENERALIZEDTIME(ASN1_GENERALIZEDTIME *a, unsigned char **pp)
73{
74# ifdef CHARSET_EBCDIC
75    /* KLUDGE! We convert to ascii before writing DER */
76    int len;
77    char tmp[24];
78    ASN1_STRING tmpstr = *(ASN1_STRING *)a;
79
80    len = tmpstr.length;
81    ebcdic2ascii(tmp, tmpstr.data, (len >= sizeof(tmp)) ? sizeof(tmp) : len);
82    tmpstr.data = tmp;
83
84    a = (ASN1_GENERALIZEDTIME *)&tmpstr;
85# endif
86    return (i2d_ASN1_bytes((ASN1_STRING *)a, pp,
87                           V_ASN1_GENERALIZEDTIME, V_ASN1_UNIVERSAL));
88}
89
90ASN1_GENERALIZEDTIME *d2i_ASN1_GENERALIZEDTIME(ASN1_GENERALIZEDTIME **a,
91                                               unsigned char **pp,
92                                               long length)
93{
94    ASN1_GENERALIZEDTIME *ret = NULL;
95
96    ret =
97        (ASN1_GENERALIZEDTIME *)d2i_ASN1_bytes((ASN1_STRING **)a, pp, length,
98                                               V_ASN1_GENERALIZEDTIME,
99                                               V_ASN1_UNIVERSAL);
100    if (ret == NULL) {
101        ASN1err(ASN1_F_D2I_ASN1_GENERALIZEDTIME, ERR_R_NESTED_ASN1_ERROR);
102        return (NULL);
103    }
104# ifdef CHARSET_EBCDIC
105    ascii2ebcdic(ret->data, ret->data, ret->length);
106# endif
107    if (!ASN1_GENERALIZEDTIME_check(ret)) {
108        ASN1err(ASN1_F_D2I_ASN1_GENERALIZEDTIME, ASN1_R_INVALID_TIME_FORMAT);
109        goto err;
110    }
111
112    return (ret);
113 err:
114    if ((ret != NULL) && ((a == NULL) || (*a != ret)))
115        M_ASN1_GENERALIZEDTIME_free(ret);
116    return (NULL);
117}
118
119#endif
120
121int asn1_generalizedtime_to_tm(struct tm *tm, const ASN1_GENERALIZEDTIME *d)
122{
123    static const int min[9] = { 0, 0, 1, 1, 0, 0, 0, 0, 0 };
124    static const int max[9] = { 99, 99, 12, 31, 23, 59, 59, 12, 59 };
125    char *a;
126    int n, i, l, o;
127
128    if (d->type != V_ASN1_GENERALIZEDTIME)
129        return (0);
130    l = d->length;
131    a = (char *)d->data;
132    o = 0;
133    /*
134     * GENERALIZEDTIME is similar to UTCTIME except the year is represented
135     * as YYYY. This stuff treats everything as a two digit field so make
136     * first two fields 00 to 99
137     */
138    if (l < 13)
139        goto err;
140    for (i = 0; i < 7; i++) {
141        if ((i == 6) && ((a[o] == 'Z') || (a[o] == '+') || (a[o] == '-'))) {
142            i++;
143            if (tm)
144                tm->tm_sec = 0;
145            break;
146        }
147        if ((a[o] < '0') || (a[o] > '9'))
148            goto err;
149        n = a[o] - '0';
150        if (++o > l)
151            goto err;
152
153        if ((a[o] < '0') || (a[o] > '9'))
154            goto err;
155        n = (n * 10) + a[o] - '0';
156        if (++o > l)
157            goto err;
158
159        if ((n < min[i]) || (n > max[i]))
160            goto err;
161        if (tm) {
162            switch (i) {
163            case 0:
164                tm->tm_year = n * 100 - 1900;
165                break;
166            case 1:
167                tm->tm_year += n;
168                break;
169            case 2:
170                tm->tm_mon = n - 1;
171                break;
172            case 3:
173                tm->tm_mday = n;
174                break;
175            case 4:
176                tm->tm_hour = n;
177                break;
178            case 5:
179                tm->tm_min = n;
180                break;
181            case 6:
182                tm->tm_sec = n;
183                break;
184            }
185        }
186    }
187    /*
188     * Optional fractional seconds: decimal point followed by one or more
189     * digits.
190     */
191    if (a[o] == '.') {
192        if (++o > l)
193            goto err;
194        i = o;
195        while ((a[o] >= '0') && (a[o] <= '9') && (o <= l))
196            o++;
197        /* Must have at least one digit after decimal point */
198        if (i == o)
199            goto err;
200    }
201
202    if (a[o] == 'Z')
203        o++;
204    else if ((a[o] == '+') || (a[o] == '-')) {
205        int offsign = a[o] == '-' ? 1 : -1, offset = 0;
206        o++;
207        if (o + 4 > l)
208            goto err;
209        for (i = 7; i < 9; i++) {
210            if ((a[o] < '0') || (a[o] > '9'))
211                goto err;
212            n = a[o] - '0';
213            o++;
214            if ((a[o] < '0') || (a[o] > '9'))
215                goto err;
216            n = (n * 10) + a[o] - '0';
217            if ((n < min[i]) || (n > max[i]))
218                goto err;
219            if (tm) {
220                if (i == 7)
221                    offset = n * 3600;
222                else if (i == 8)
223                    offset += n * 60;
224            }
225            o++;
226        }
227        if (offset && !OPENSSL_gmtime_adj(tm, 0, offset * offsign))
228            return 0;
229    } else if (a[o]) {
230        /* Missing time zone information. */
231        goto err;
232    }
233    return (o == l);
234 err:
235    return (0);
236}
237
238int ASN1_GENERALIZEDTIME_check(const ASN1_GENERALIZEDTIME *d)
239{
240    return asn1_generalizedtime_to_tm(NULL, d);
241}
242
243int ASN1_GENERALIZEDTIME_set_string(ASN1_GENERALIZEDTIME *s, const char *str)
244{
245    ASN1_GENERALIZEDTIME t;
246
247    t.type = V_ASN1_GENERALIZEDTIME;
248    t.length = strlen(str);
249    t.data = (unsigned char *)str;
250    if (ASN1_GENERALIZEDTIME_check(&t)) {
251        if (s != NULL) {
252            if (!ASN1_STRING_set((ASN1_STRING *)s,
253                                 (unsigned char *)str, t.length))
254                return 0;
255            s->type = V_ASN1_GENERALIZEDTIME;
256        }
257        return (1);
258    } else
259        return (0);
260}
261
262ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_set(ASN1_GENERALIZEDTIME *s,
263                                               time_t t)
264{
265    return ASN1_GENERALIZEDTIME_adj(s, t, 0, 0);
266}
267
268ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_adj(ASN1_GENERALIZEDTIME *s,
269                                               time_t t, int offset_day,
270                                               long offset_sec)
271{
272    char *p;
273    struct tm *ts;
274    struct tm data;
275    size_t len = 20;
276
277    if (s == NULL)
278        s = M_ASN1_GENERALIZEDTIME_new();
279    if (s == NULL)
280        return (NULL);
281
282    ts = OPENSSL_gmtime(&t, &data);
283    if (ts == NULL)
284        return (NULL);
285
286    if (offset_day || offset_sec) {
287        if (!OPENSSL_gmtime_adj(ts, offset_day, offset_sec))
288            return NULL;
289    }
290
291    p = (char *)s->data;
292    if ((p == NULL) || ((size_t)s->length < len)) {
293        p = OPENSSL_malloc(len);
294        if (p == NULL) {
295            ASN1err(ASN1_F_ASN1_GENERALIZEDTIME_ADJ, ERR_R_MALLOC_FAILURE);
296            return (NULL);
297        }
298        if (s->data != NULL)
299            OPENSSL_free(s->data);
300        s->data = (unsigned char *)p;
301    }
302
303    BIO_snprintf(p, len, "%04d%02d%02d%02d%02d%02dZ", ts->tm_year + 1900,
304                 ts->tm_mon + 1, ts->tm_mday, ts->tm_hour, ts->tm_min,
305                 ts->tm_sec);
306    s->length = strlen(p);
307    s->type = V_ASN1_GENERALIZEDTIME;
308#ifdef CHARSET_EBCDIC_not
309    ebcdic2ascii(s->data, s->data, s->length);
310#endif
311    return (s);
312}
313