diff options
Diffstat (limited to 'src/crypto/time_support.c')
-rw-r--r-- | src/crypto/time_support.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/src/crypto/time_support.c b/src/crypto/time_support.c new file mode 100644 index 0000000..bbfe303 --- /dev/null +++ b/src/crypto/time_support.c @@ -0,0 +1,200 @@ +/* Written by Richard Levitte (richard@levitte.org) for the OpenSSL + * project 2001. + * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL + * project 2008. + */ +/* ==================================================================== + * Copyright (c) 2001 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * licensing@OpenSSL.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * ==================================================================== + * + * This product includes cryptographic software written by Eric Young + * (eay@cryptsoft.com). This product includes software written by Tim + * Hudson (tjh@cryptsoft.com). */ + +#if !defined(_POSIX_C_SOURCE) +#define _POSIX_C_SOURCE 201410L /* for gmtime_r */ +#endif + +#include <openssl/time_support.h> + +#define SECS_PER_DAY (24 * 60 * 60) + +struct tm *OPENSSL_gmtime(const time_t *time, struct tm *result) { +#if defined(OPENSSL_WINDOWS) + if (gmtime_s(result, time)) { + return NULL; + } + return result; +#else + return gmtime_r(time, result); +#endif +} + +/* Convert date to and from julian day Uses Fliegel & Van Flandern algorithm */ +static long date_to_julian(int y, int m, int d) { + return (1461 * (y + 4800 + (m - 14) / 12)) / 4 + + (367 * (m - 2 - 12 * ((m - 14) / 12))) / 12 - + (3 * ((y + 4900 + (m - 14) / 12) / 100)) / 4 + d - 32075; +} + +static void julian_to_date(long jd, int *y, int *m, int *d) { + long L = jd + 68569; + long n = (4 * L) / 146097; + long i, j; + + L = L - (146097 * n + 3) / 4; + i = (4000 * (L + 1)) / 1461001; + L = L - (1461 * i) / 4 + 31; + j = (80 * L) / 2447; + *d = L - (2447 * j) / 80; + L = j / 11; + *m = j + 2 - (12 * L); + *y = 100 * (n - 49) + i + L; +} + +/* Convert tm structure and offset into julian day and seconds */ +static int julian_adj(const struct tm *tm, int off_day, long offset_sec, + long *pday, int *psec) { + int offset_hms, offset_day; + long time_jd; + int time_year, time_month, time_day; + /* split offset into days and day seconds */ + offset_day = offset_sec / SECS_PER_DAY; + /* Avoid sign issues with % operator */ + offset_hms = offset_sec - (offset_day * SECS_PER_DAY); + offset_day += off_day; + /* Add current time seconds to offset */ + offset_hms += tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec; + /* Adjust day seconds if overflow */ + if (offset_hms >= SECS_PER_DAY) { + offset_day++; + offset_hms -= SECS_PER_DAY; + } else if (offset_hms < 0) { + offset_day--; + offset_hms += SECS_PER_DAY; + } + + /* Convert date of time structure into a Julian day number. */ + + time_year = tm->tm_year + 1900; + time_month = tm->tm_mon + 1; + time_day = tm->tm_mday; + + time_jd = date_to_julian(time_year, time_month, time_day); + + /* Work out Julian day of new date */ + time_jd += offset_day; + + if (time_jd < 0) + return 0; + + *pday = time_jd; + *psec = offset_hms; + return 1; +} + +int OPENSSL_gmtime_adj(struct tm *tm, int off_day, long offset_sec) { + int time_sec, time_year, time_month, time_day; + long time_jd; + + /* Convert time and offset into julian day and seconds */ + if (!julian_adj(tm, off_day, offset_sec, &time_jd, &time_sec)) + return 0; + + /* Convert Julian day back to date */ + + julian_to_date(time_jd, &time_year, &time_month, &time_day); + + if (time_year < 1900 || time_year > 9999) + return 0; + + /* Update tm structure */ + + tm->tm_year = time_year - 1900; + tm->tm_mon = time_month - 1; + tm->tm_mday = time_day; + + tm->tm_hour = time_sec / 3600; + tm->tm_min = (time_sec / 60) % 60; + tm->tm_sec = time_sec % 60; + + return 1; +} + +int OPENSSL_gmtime_diff(int *pday, int *psec, const struct tm *from, + const struct tm *to) { + int from_sec, to_sec, diff_sec; + long from_jd, to_jd, diff_day; + + if (!julian_adj(from, 0, 0, &from_jd, &from_sec)) { + return 0; + } + if (!julian_adj(to, 0, 0, &to_jd, &to_sec)) { + return 0; + } + + diff_day = to_jd - from_jd; + diff_sec = to_sec - from_sec; + /* Adjust differences so both positive or both negative */ + if (diff_day > 0 && diff_sec < 0) { + diff_day--; + diff_sec += SECS_PER_DAY; + } + if (diff_day < 0 && diff_sec > 0) { + diff_day++; + diff_sec -= SECS_PER_DAY; + } + + if (pday) { + *pday = (int)diff_day; + } + if (psec) { + *psec = diff_sec; + } + + return 1; +} |