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 <string.h>
60#include <time.h>
61
62#include <openssl/asn1t.h>
63#include <openssl/buf.h>
64#include <openssl/err.h>
65#include <openssl/mem.h>
66
67#include "asn1_locl.h"
68
69/*
70 * This is an implementation of the ASN1 Time structure which is: Time ::=
71 * CHOICE { utcTime UTCTime, generalTime GeneralizedTime } written by Steve
72 * Henson.
73 */
74
75IMPLEMENT_ASN1_MSTRING(ASN1_TIME, B_ASN1_TIME)
76
77IMPLEMENT_ASN1_FUNCTIONS(ASN1_TIME)
78
79ASN1_TIME *ASN1_TIME_set(ASN1_TIME *s, time_t t)
80{
81    return ASN1_TIME_adj(s, t, 0, 0);
82}
83
84ASN1_TIME *ASN1_TIME_adj(ASN1_TIME *s, time_t t,
85                         int offset_day, long offset_sec)
86{
87    struct tm *ts;
88    struct tm data;
89
90    ts = OPENSSL_gmtime(&t, &data);
91    if (ts == NULL) {
92        OPENSSL_PUT_ERROR(ASN1, ASN1_R_ERROR_GETTING_TIME);
93        return NULL;
94    }
95    if (offset_day || offset_sec) {
96        if (!OPENSSL_gmtime_adj(ts, offset_day, offset_sec))
97            return NULL;
98    }
99    if ((ts->tm_year >= 50) && (ts->tm_year < 150))
100        return ASN1_UTCTIME_adj(s, t, offset_day, offset_sec);
101    return ASN1_GENERALIZEDTIME_adj(s, t, offset_day, offset_sec);
102}
103
104int ASN1_TIME_check(ASN1_TIME *t)
105{
106    if (t->type == V_ASN1_GENERALIZEDTIME)
107        return ASN1_GENERALIZEDTIME_check(t);
108    else if (t->type == V_ASN1_UTCTIME)
109        return ASN1_UTCTIME_check(t);
110    return 0;
111}
112
113/* Convert an ASN1_TIME structure to GeneralizedTime */
114ASN1_GENERALIZEDTIME *ASN1_TIME_to_generalizedtime(ASN1_TIME *t,
115                                                   ASN1_GENERALIZEDTIME **out)
116{
117    ASN1_GENERALIZEDTIME *ret = NULL;
118    char *str;
119    int newlen;
120
121    if (!ASN1_TIME_check(t))
122        return NULL;
123
124    if (!out || !*out) {
125        if (!(ret = ASN1_GENERALIZEDTIME_new()))
126            goto err;
127    } else {
128        ret = *out;
129    }
130
131    /* If already GeneralizedTime just copy across */
132    if (t->type == V_ASN1_GENERALIZEDTIME) {
133        if (!ASN1_STRING_set(ret, t->data, t->length))
134            goto err;
135        goto done;
136    }
137
138    /* grow the string */
139    if (!ASN1_STRING_set(ret, NULL, t->length + 2))
140        goto err;
141    /* ASN1_STRING_set() allocated 'len + 1' bytes. */
142    newlen = t->length + 2 + 1;
143    str = (char *)ret->data;
144    /* Work out the century and prepend */
145    if (t->data[0] >= '5')
146        BUF_strlcpy(str, "19", newlen);
147    else
148        BUF_strlcpy(str, "20", newlen);
149
150    BUF_strlcat(str, (char *)t->data, newlen);
151
152 done:
153   if (out != NULL && *out == NULL)
154       *out = ret;
155   return ret;
156
157 err:
158    if (out == NULL || *out != ret)
159        ASN1_GENERALIZEDTIME_free(ret);
160    return NULL;
161}
162
163
164int ASN1_TIME_set_string(ASN1_TIME *s, const char *str)
165{
166    ASN1_TIME t;
167
168    t.length = strlen(str);
169    t.data = (unsigned char *)str;
170    t.flags = 0;
171
172    t.type = V_ASN1_UTCTIME;
173
174    if (!ASN1_TIME_check(&t)) {
175        t.type = V_ASN1_GENERALIZEDTIME;
176        if (!ASN1_TIME_check(&t))
177            return 0;
178    }
179
180    if (s && !ASN1_STRING_copy((ASN1_STRING *)s, (ASN1_STRING *)&t))
181        return 0;
182
183    return 1;
184}
185
186static int asn1_time_to_tm(struct tm *tm, const ASN1_TIME *t)
187{
188    if (t == NULL) {
189        time_t now_t;
190        time(&now_t);
191        if (OPENSSL_gmtime(&now_t, tm))
192            return 1;
193        return 0;
194    }
195
196    if (t->type == V_ASN1_UTCTIME)
197        return asn1_utctime_to_tm(tm, t);
198    else if (t->type == V_ASN1_GENERALIZEDTIME)
199        return asn1_generalizedtime_to_tm(tm, t);
200
201    return 0;
202}
203
204int ASN1_TIME_diff(int *pday, int *psec,
205                   const ASN1_TIME *from, const ASN1_TIME *to)
206{
207    struct tm tm_from, tm_to;
208    if (!asn1_time_to_tm(&tm_from, from))
209        return 0;
210    if (!asn1_time_to_tm(&tm_to, to))
211        return 0;
212    return OPENSSL_gmtime_diff(pday, psec, &tm_from, &tm_to);
213}
214