crypto/asn1/a_time.c

   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 "internal/cryptlib.h"
  67 #include <openssl/asn1t.h>
  68 #include "asn1_locl.h"
  69
  70 IMPLEMENT_ASN1_MSTRING(ASN1_TIME, B_ASN1_TIME)
  71
  72 IMPLEMENT_ASN1_FUNCTIONS(ASN1_TIME)
  73
  74 ASN1_TIME *ASN1_TIME_set(ASN1_TIME *s, time_t t)
  75 {
  76     return ASN1_TIME_adj(s, t, 0, 0);
  77 }
  78
  79 ASN1_TIME *ASN1_TIME_adj(ASN1_TIME *s, time_t t,
  80                          int offset_day, long offset_sec)
  81 {
  82     struct tm *ts;
  83     struct tm data;
  84
  85     ts = OPENSSL_gmtime(&t, &data);
  86     if (ts == NULL) {
  87         ASN1err(ASN1_F_ASN1_TIME_ADJ, ASN1_R_ERROR_GETTING_TIME);
  88         return NULL;
  89     }
  90     if (offset_day || offset_sec) {
  91         if (!OPENSSL_gmtime_adj(ts, offset_day, offset_sec))
  92             return NULL;
  93     }
  94     if ((ts->tm_year >= 50) && (ts->tm_year < 150))
  95         return ASN1_UTCTIME_adj(s, t, offset_day, offset_sec);
  96     return ASN1_GENERALIZEDTIME_adj(s, t, offset_day, offset_sec);
  97 }
  98
  99 int ASN1_TIME_check(const ASN1_TIME *t)
 100 {
 101     if (t->type == V_ASN1_GENERALIZEDTIME)
 102         return ASN1_GENERALIZEDTIME_check(t);
 103     else if (t->type == V_ASN1_UTCTIME)
 104         return ASN1_UTCTIME_check(t);
 105     return 0;
 106 }
 107
 108 /* Convert an ASN1_TIME structure to GeneralizedTime */
 109 ASN1_GENERALIZEDTIME *ASN1_TIME_to_generalizedtime(ASN1_TIME *t,
 110                                                    ASN1_GENERALIZEDTIME **out)
 111 {
 112     ASN1_GENERALIZEDTIME *ret;
 113     char *str;
 114     int newlen;
 115
 116     if (!ASN1_TIME_check(t))
 117         return NULL;
 118
 119     if (out == NULL || *out == NULL) {
 120         if ((ret = ASN1_GENERALIZEDTIME_new()) == NULL)
 121             return NULL;
 122         if (out)
 123             *out = ret;
 124     } else
 125         ret = *out;
 126
 127     /* If already GeneralizedTime just copy across */
 128     if (t->type == V_ASN1_GENERALIZEDTIME) {
 129         if (!ASN1_STRING_set(ret, t->data, t->length))
 130             return NULL;
 131         return ret;
 132     }
 133
 134     /* grow the string */
 135     if (!ASN1_STRING_set(ret, NULL, t->length + 2))
 136         return NULL;
 137     /* ASN1_STRING_set() allocated 'len + 1' bytes. */
 138     newlen = t->length + 2 + 1;
 139     str = (char *)ret->data;
 140     /* Work out the century and prepend */
 141     if (t->data[0] >= '5')
 142         BUF_strlcpy(str, "19", newlen);
 143     else
 144         BUF_strlcpy(str, "20", newlen);
 145
 146     BUF_strlcat(str, (char *)t->data, newlen);
 147
 148     return ret;
 149 }
 150
 151 int ASN1_TIME_set_string(ASN1_TIME *s, const char *str)
 152 {
 153     ASN1_TIME t;
 154
 155     t.length = strlen(str);
 156     t.data = (unsigned char *)str;
 157     t.flags = 0;
 158
 159     t.type = V_ASN1_UTCTIME;
 160
 161     if (!ASN1_TIME_check(&t)) {
 162         t.type = V_ASN1_GENERALIZEDTIME;
 163         if (!ASN1_TIME_check(&t))
 164             return 0;
 165     }
 166
 167     if (s && !ASN1_STRING_copy((ASN1_STRING *)s, (ASN1_STRING *)&t))
 168         return 0;
 169
 170     return 1;
 171 }
 172
 173 static int asn1_time_to_tm(struct tm *tm, const ASN1_TIME *t)
 174 {
 175     if (t == NULL) {
 176         time_t now_t;
 177         time(&now_t);
 178         if (OPENSSL_gmtime(&now_t, tm))
 179             return 1;
 180         return 0;
 181     }
 182
 183     if (t->type == V_ASN1_UTCTIME)
 184         return asn1_utctime_to_tm(tm, t);
 185     else if (t->type == V_ASN1_GENERALIZEDTIME)
 186         return asn1_generalizedtime_to_tm(tm, t);
 187
 188     return 0;
 189 }
 190
 191 int ASN1_TIME_diff(int *pday, int *psec,
 192                    const ASN1_TIME *from, const ASN1_TIME *to)
 193 {
 194     struct tm tm_from, tm_to;
 195     if (!asn1_time_to_tm(&tm_from, from))
 196         return 0;
 197     if (!asn1_time_to_tm(&tm_to, to))
 198         return 0;
 199     return OPENSSL_gmtime_diff(pday, psec, &tm_from, &tm_to);
 200 }