2 * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 * This is an implementation of the ASN1 Time structure which is:
14 * generalTime GeneralizedTime }
19 #include "internal/cryptlib.h"
20 #include <openssl/asn1t.h>
21 #include "asn1_locl.h"
23 IMPLEMENT_ASN1_MSTRING(ASN1_TIME, B_ASN1_TIME)
25 IMPLEMENT_ASN1_FUNCTIONS(ASN1_TIME)
27 ASN1_TIME *ASN1_TIME_set(ASN1_TIME *s, time_t t)
29 return ASN1_TIME_adj(s, t, 0, 0);
32 ASN1_TIME *ASN1_TIME_adj(ASN1_TIME *s, time_t t,
33 int offset_day, long offset_sec)
38 ts = OPENSSL_gmtime(&t, &data);
40 ASN1err(ASN1_F_ASN1_TIME_ADJ, ASN1_R_ERROR_GETTING_TIME);
43 if (offset_day || offset_sec) {
44 if (!OPENSSL_gmtime_adj(ts, offset_day, offset_sec))
47 if ((ts->tm_year >= 50) && (ts->tm_year < 150))
48 return ASN1_UTCTIME_adj(s, t, offset_day, offset_sec);
49 return ASN1_GENERALIZEDTIME_adj(s, t, offset_day, offset_sec);
52 int ASN1_TIME_check(const ASN1_TIME *t)
54 if (t->type == V_ASN1_GENERALIZEDTIME)
55 return ASN1_GENERALIZEDTIME_check(t);
56 else if (t->type == V_ASN1_UTCTIME)
57 return ASN1_UTCTIME_check(t);
61 /* Convert an ASN1_TIME structure to GeneralizedTime */
62 ASN1_GENERALIZEDTIME *ASN1_TIME_to_generalizedtime(const ASN1_TIME *t,
63 ASN1_GENERALIZEDTIME **out)
65 ASN1_GENERALIZEDTIME *ret = NULL;
68 if (!ASN1_TIME_check(t))
71 if (out == NULL || *out == NULL) {
72 if ((ret = ASN1_GENERALIZEDTIME_new()) == NULL)
77 /* If already GeneralizedTime just copy across */
78 if (t->type == V_ASN1_GENERALIZEDTIME) {
79 if (!ASN1_STRING_set(ret, t->data, t->length))
85 if (!ASN1_STRING_set(ret, NULL, t->length + 2))
87 str = (char *)ret->data;
88 /* Work out the century and prepend */
89 if (t->data[0] >= '5')
94 strcat(str, (const char *)t->data);
97 if (out != NULL && *out == NULL)
102 if (out == NULL || *out != ret)
103 ASN1_GENERALIZEDTIME_free(ret);
107 int ASN1_TIME_set_string(ASN1_TIME *s, const char *str)
111 t.length = strlen(str);
112 t.data = (unsigned char *)str;
115 t.type = V_ASN1_UTCTIME;
117 if (!ASN1_TIME_check(&t)) {
118 t.type = V_ASN1_GENERALIZEDTIME;
119 if (!ASN1_TIME_check(&t))
123 if (s && !ASN1_STRING_copy((ASN1_STRING *)s, (ASN1_STRING *)&t))
129 int ASN1_TIME_set_string_X509(ASN1_TIME *s, const char *str)
135 t.length = strlen(str);
136 t.data = (unsigned char *)str;
137 t.flags = ASN1_STRING_FLAG_X509_TIME;
139 t.type = V_ASN1_UTCTIME;
141 if (!ASN1_TIME_check(&t)) {
142 t.type = V_ASN1_GENERALIZEDTIME;
143 if (!ASN1_TIME_check(&t))
148 * Per RFC 5280 (section 4.1.2.5.), the valid input time
149 * strings should be encoded with the following rules:
151 * 1. UTC: YYMMDDHHMMSSZ, if YY < 50 (20YY) --> UTC: YYMMDDHHMMSSZ
152 * 2. UTC: YYMMDDHHMMSSZ, if YY >= 50 (19YY) --> UTC: YYMMDDHHMMSSZ
153 * 3. G'd: YYYYMMDDHHMMSSZ, if YYYY >= 2050 --> G'd: YYYYMMDDHHMMSSZ
154 * 4. G'd: YYYYMMDDHHMMSSZ, if YYYY < 2050 --> UTC: YYMMDDHHMMSSZ
156 * Only strings of the 4th rule should be reformatted, but since a
157 * UTC can only present [1950, 2050), so if the given time string
158 * is less than 1950 (e.g. 19230419000000Z), we do nothing...
161 if (s != NULL && t.type == V_ASN1_GENERALIZEDTIME) {
162 if (!asn1_generalizedtime_to_tm(&tm, &t))
164 if (tm.tm_year >= 50 && tm.tm_year < 150) {
167 * it's OK to let original t.data go since that's assigned
168 * to a piece of memory allocated outside of this function.
169 * new t.data would be freed after ASN1_STRING_copy is done.
171 t.data = OPENSSL_zalloc(t.length + 1);
174 memcpy(t.data, str + 2, t.length);
175 t.type = V_ASN1_UTCTIME;
179 if (s == NULL || ASN1_STRING_copy((ASN1_STRING *)s, (ASN1_STRING *)&t))
182 if (t.data != (unsigned char *)str)
183 OPENSSL_free(t.data);
188 int ASN1_TIME_to_tm(const ASN1_TIME *s, struct tm *tm)
194 memset(tm, 0, sizeof(*tm));
195 if (OPENSSL_gmtime(&now_t, tm))
200 if (s->type == V_ASN1_UTCTIME) {
201 memset(tm, 0, sizeof(*tm));
202 return asn1_utctime_to_tm(tm, s);
204 if (s->type == V_ASN1_GENERALIZEDTIME) {
205 memset(tm, 0, sizeof(*tm));
206 return asn1_generalizedtime_to_tm(tm, s);
212 int ASN1_TIME_diff(int *pday, int *psec,
213 const ASN1_TIME *from, const ASN1_TIME *to)
215 struct tm tm_from, tm_to;
217 if (!ASN1_TIME_to_tm(from, &tm_from))
219 if (!ASN1_TIME_to_tm(to, &tm_to))
221 return OPENSSL_gmtime_diff(pday, psec, &tm_from, &tm_to);
224 int ASN1_TIME_print(BIO *bp, const ASN1_TIME *tm)
226 if (tm->type == V_ASN1_UTCTIME)
227 return ASN1_UTCTIME_print(bp, tm);
228 if (tm->type == V_ASN1_GENERALIZEDTIME)
229 return ASN1_GENERALIZEDTIME_print(bp, tm);
230 BIO_write(bp, "Bad time value", 14);