137 lines
3.8 KiB
C
137 lines
3.8 KiB
C
/*
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* Copyright (c) 1997 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "der_locl.h"
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#define ASN1_MAX_YEAR 2000
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static int
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is_leap(unsigned y)
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{
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y += 1900;
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return (y % 4) == 0 && ((y % 100) != 0 || (y % 400) == 0);
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}
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static const unsigned ndays[2][12] ={
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{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
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{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}};
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/*
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* This is a simplifed version of timegm(3) that doesn't accept out of
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* bound values that timegm(3) normally accepts but those are not
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* valid in asn1 encodings.
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*/
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time_t
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_der_timegm (struct tm *tm)
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{
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time_t res = 0;
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int i;
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/*
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* See comment in _der_gmtime
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*/
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if (tm->tm_year > ASN1_MAX_YEAR)
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return 0;
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if (tm->tm_year < 0)
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return -1;
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if (tm->tm_mon < 0 || tm->tm_mon > 11)
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return -1;
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if (tm->tm_mday < 1 || tm->tm_mday > (int)ndays[is_leap(tm->tm_year)][tm->tm_mon])
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return -1;
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if (tm->tm_hour < 0 || tm->tm_hour > 23)
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return -1;
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if (tm->tm_min < 0 || tm->tm_min > 59)
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return -1;
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if (tm->tm_sec < 0 || tm->tm_sec > 59)
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return -1;
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for (i = 70; i < tm->tm_year; ++i)
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res += is_leap(i) ? 366 : 365;
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for (i = 0; i < tm->tm_mon; ++i)
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res += ndays[is_leap(tm->tm_year)][i];
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res += tm->tm_mday - 1;
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res *= 24;
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res += tm->tm_hour;
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res *= 60;
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res += tm->tm_min;
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res *= 60;
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res += tm->tm_sec;
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return res;
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}
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struct tm *
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_der_gmtime(time_t t, struct tm *tm)
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{
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time_t secday = t % (3600 * 24);
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time_t days = t / (3600 * 24);
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memset(tm, 0, sizeof(*tm));
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tm->tm_sec = secday % 60;
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tm->tm_min = (secday % 3600) / 60;
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tm->tm_hour = (int)(secday / 3600);
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/*
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* Refuse to calculate time ~ 2000 years into the future, this is
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* not possible for systems where time_t is a int32_t, however,
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* when time_t is a int64_t, that can happen, and this becomes a
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* denial of sevice.
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*/
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if (days > (ASN1_MAX_YEAR * 365))
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return NULL;
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tm->tm_year = 70;
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while(1) {
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unsigned dayinyear = (is_leap(tm->tm_year) ? 366 : 365);
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if (days < dayinyear)
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break;
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tm->tm_year += 1;
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days -= dayinyear;
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}
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tm->tm_mon = 0;
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while (1) {
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unsigned daysinmonth = ndays[is_leap(tm->tm_year)][tm->tm_mon];
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if (days < daysinmonth)
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break;
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days -= daysinmonth;
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tm->tm_mon++;
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}
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tm->tm_mday = (int)(days + 1);
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return tm;
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}
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