a_time.c revision 325335 
1/* crypto/asn1/a_time.c */
2/* ====================================================================
3 * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in
14 *    the documentation and/or other materials provided with the
15 *    distribution.
16 *
17 * 3. All advertising materials mentioning features or use of this
18 *    software must display the following acknowledgment:
19 *    "This product includes software developed by the OpenSSL Project
20 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
21 *
22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23 *    endorse or promote products derived from this software without
24 *    prior written permission. For written permission, please contact
25 *    licensing@OpenSSL.org.
26 *
27 * 5. Products derived from this software may not be called "OpenSSL"
28 *    nor may "OpenSSL" appear in their names without prior written
29 *    permission of the OpenSSL Project.
30 *
31 * 6. Redistributions of any form whatsoever must retain the following
32 *    acknowledgment:
33 *    "This product includes software developed by the OpenSSL Project
34 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
35 *
36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47 * OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
49 *
50 * This product includes cryptographic software written by Eric Young
51 * (eay@cryptsoft.com).  This product includes software written by Tim
52 * Hudson (tjh@cryptsoft.com).
53 *
54 */
55
56/*-
57 * This is an implementation of the ASN1 Time structure which is:
58 *    Time ::= CHOICE {
59 *      utcTime        UTCTime,
60 *      generalTime    GeneralizedTime }
61 * written by Steve Henson.
62 */
63
64#include <stdio.h>
65#include <time.h>
66#include "cryptlib.h"
67#include "o_time.h"
68#include <openssl/asn1t.h>
69#include "asn1_locl.h"
70
71IMPLEMENT_ASN1_MSTRING(ASN1_TIME, B_ASN1_TIME)
72
73IMPLEMENT_ASN1_FUNCTIONS(ASN1_TIME)
74
75#if 0
76int i2d_ASN1_TIME(ASN1_TIME *a, unsigned char **pp)
77{
78# ifdef CHARSET_EBCDIC
79    /* KLUDGE! We convert to ascii before writing DER */
80    char tmp[24];
81    ASN1_STRING tmpstr;
82
83    if (a->type == V_ASN1_UTCTIME || a->type == V_ASN1_GENERALIZEDTIME) {
84        int len;
85
86        tmpstr = *(ASN1_STRING *)a;
87        len = tmpstr.length;
88        ebcdic2ascii(tmp, tmpstr.data,
89                     (len >= sizeof tmp) ? sizeof tmp : len);
90        tmpstr.data = tmp;
91        a = (ASN1_GENERALIZEDTIME *)&tmpstr;
92    }
93# endif
94    if (a->type == V_ASN1_UTCTIME || a->type == V_ASN1_GENERALIZEDTIME)
95        return (i2d_ASN1_bytes((ASN1_STRING *)a, pp,
96                               a->type, V_ASN1_UNIVERSAL));
97    ASN1err(ASN1_F_I2D_ASN1_TIME, ASN1_R_EXPECTING_A_TIME);
98    return -1;
99}
100#endif
101
102ASN1_TIME *ASN1_TIME_set(ASN1_TIME *s, time_t t)
103{
104    return ASN1_TIME_adj(s, t, 0, 0);
105}
106
107ASN1_TIME *ASN1_TIME_adj(ASN1_TIME *s, time_t t,
108                         int offset_day, long offset_sec)
109{
110    struct tm *ts;
111    struct tm data;
112
113    ts = OPENSSL_gmtime(&t, &data);
114    if (ts == NULL) {
115        ASN1err(ASN1_F_ASN1_TIME_ADJ, ASN1_R_ERROR_GETTING_TIME);
116        return NULL;
117    }
118    if (offset_day || offset_sec) {
119        if (!OPENSSL_gmtime_adj(ts, offset_day, offset_sec))
120            return NULL;
121    }
122    if ((ts->tm_year >= 50) && (ts->tm_year < 150))
123        return ASN1_UTCTIME_adj(s, t, offset_day, offset_sec);
124    return ASN1_GENERALIZEDTIME_adj(s, t, offset_day, offset_sec);
125}
126
127int ASN1_TIME_check(ASN1_TIME *t)
128{
129    if (t->type == V_ASN1_GENERALIZEDTIME)
130        return ASN1_GENERALIZEDTIME_check(t);
131    else if (t->type == V_ASN1_UTCTIME)
132        return ASN1_UTCTIME_check(t);
133    return 0;
134}
135
136/* Convert an ASN1_TIME structure to GeneralizedTime */
137ASN1_GENERALIZEDTIME *ASN1_TIME_to_generalizedtime(ASN1_TIME *t,
138                                                   ASN1_GENERALIZEDTIME **out)
139{
140    ASN1_GENERALIZEDTIME *ret = NULL;
141    char *str;
142    int newlen;
143
144    if (!ASN1_TIME_check(t))
145        return NULL;
146
147    if (!out || !*out) {
148        if (!(ret = ASN1_GENERALIZEDTIME_new()))
149            goto err;
150    } else {
151        ret = *out;
152    }
153
154    /* If already GeneralizedTime just copy across */
155    if (t->type == V_ASN1_GENERALIZEDTIME) {
156        if (!ASN1_STRING_set(ret, t->data, t->length))
157            goto err;
158        goto done;
159    }
160
161    /* grow the string */
162    if (!ASN1_STRING_set(ret, NULL, t->length + 2))
163        goto err;
164    /* ASN1_STRING_set() allocated 'len + 1' bytes. */
165    newlen = t->length + 2 + 1;
166    str = (char *)ret->data;
167    /* Work out the century and prepend */
168    if (t->data[0] >= '5')
169        BUF_strlcpy(str, "19", newlen);
170    else
171        BUF_strlcpy(str, "20", newlen);
172
173    BUF_strlcat(str, (char *)t->data, newlen);
174
175 done:
176   if (out != NULL && *out == NULL)
177       *out = ret;
178   return ret;
179
180 err:
181    if (out == NULL || *out != ret)
182        ASN1_GENERALIZEDTIME_free(ret);
183    return NULL;
184}
185
186
187int ASN1_TIME_set_string(ASN1_TIME *s, const char *str)
188{
189    ASN1_TIME t;
190
191    t.length = strlen(str);
192    t.data = (unsigned char *)str;
193    t.flags = 0;
194
195    t.type = V_ASN1_UTCTIME;
196
197    if (!ASN1_TIME_check(&t)) {
198        t.type = V_ASN1_GENERALIZEDTIME;
199        if (!ASN1_TIME_check(&t))
200            return 0;
201    }
202
203    if (s && !ASN1_STRING_copy((ASN1_STRING *)s, (ASN1_STRING *)&t))
204        return 0;
205
206    return 1;
207}
208
209static int asn1_time_to_tm(struct tm *tm, const ASN1_TIME *t)
210{
211    if (t == NULL) {
212        time_t now_t;
213        time(&now_t);
214        if (OPENSSL_gmtime(&now_t, tm))
215            return 1;
216        return 0;
217    }
218
219    if (t->type == V_ASN1_UTCTIME)
220        return asn1_utctime_to_tm(tm, t);
221    else if (t->type == V_ASN1_GENERALIZEDTIME)
222        return asn1_generalizedtime_to_tm(tm, t);
223
224    return 0;
225}
226
227int ASN1_TIME_diff(int *pday, int *psec,
228                   const ASN1_TIME *from, const ASN1_TIME *to)
229{
230    struct tm tm_from, tm_to;
231    if (!asn1_time_to_tm(&tm_from, from))
232        return 0;
233    if (!asn1_time_to_tm(&tm_to, to))
234        return 0;
235    return OPENSSL_gmtime_diff(pday, psec, &tm_from, &tm_to);
236}
237