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Improve struct tm population

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Using Zeller's congruence to fill the day of week field,
Also populate the day of year field.

Add unit test to cover a number of cases.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3999)
This commit is contained in:
Pauli 2017-07-24 09:10:13 +10:00
parent 3d0f1cb9fd
commit 1a68e5b0d9
3 changed files with 117 additions and 4 deletions
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33
crypto/asn1/a_time.c
View File

@ -31,6 +31,38 @@ static int leap_year(const int year)
return 0;
}
/*
* Compute the day of the week and the day of the year from the year, month
* and day. The day of the year is straightforward, the day of the week uses
* a form of Zeller's congruence. For this months start with March and are
* numbered 4 through 15.
*/
static void determine_days(struct tm *tm)
{
static const int ydays[12] = {
0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
};
int y = tm->tm_year + 1900;
int m = tm->tm_mon;
int d = tm->tm_mday;
int c;
tm->tm_yday = ydays[m] + d - 1;
if (m >= 2) {
/* March and onwards can be one day further into the year */
tm->tm_yday += leap_year(y);
m += 2;
} else {
/* Treat January and February as part of the previous year */
m += 14;
y--;
}
c = y / 100;
y %= 100;
/* Zeller's congruance */
tm->tm_wday = (d + (13 * m) / 5 + y + y / 4 + c / 4 + 5 * c + 6) % 7;
}
int asn1_time_to_tm(struct tm *tm, const ASN1_TIME *d)
{
static const int min[9] = { 0, 0, 1, 1, 0, 0, 0, 0, 0 };
@ -127,6 +159,7 @@ int asn1_time_to_tm(struct tm *tm, const ASN1_TIME *d)
if (n > md)
goto err;
tmp.tm_mday = n;
determine_days(&tmp);
break;
case 4:
tmp.tm_hour = n;

8
doc/man3/ASN1_TIME_set.pod
View File

@ -55,10 +55,10 @@ an error.
ASN1_TIME_to_tm() converts the time B<s> to the standard B<tm> structure.
If B<s> is NULL, then the current time is converted. The output time is GMT.
The B<tm_sec>, B<tm_min>, B<tm_hour>, B<tm_mday>, B<tm_mon> and B<tm_year>
fields of B<tm> structure are set to proper values, whereas all other fields
are set to 0. If B<tm> is NULL this function performs a format check on B<s>
only.
The B<tm_sec>, B<tm_min>, B<tm_hour>, B<tm_mday>, B<tm_wday>, B<tm_yday>,
B<tm_mon> and B<tm_year> fields of B<tm> structure are set to proper values,
whereas all other fields are set to 0. If B<tm> is NULL this function performs
a format check on B<s> only.
ASN1_TIME_diff() sets B<*pday> and B<*psec> to the time difference between
B<from> and B<to>. If B<to> represents a time later than B<from> then

80
test/x509_time_test.c
View File

@ -345,9 +345,89 @@ out:
return rv;
}
static const struct {
int y, m, d;
int yd, wd;
} day_of_week_tests[] = {
/*YYYY MM DD DoY DoW */
{ 1900, 1, 1, 0, 1 },
{ 1900, 2, 28, 58, 3 },
{ 1900, 3, 1, 59, 4 },
{ 1900, 12, 31, 364, 1 },
{ 1901, 1, 1, 0, 2 },
{ 1970, 1, 1, 0, 4 },
{ 1999, 1, 10, 9, 0 },
{ 1999, 12, 31, 364, 5 },
{ 2000, 1, 1, 0, 6 },
{ 2000, 2, 28, 58, 1 },
{ 2000, 2, 29, 59, 2 },
{ 2000, 3, 1, 60, 3 },
{ 2000, 12, 31, 365, 0 },
{ 2001, 1, 1, 0, 1 },
{ 2008, 1, 1, 0, 2 },
{ 2008, 2, 28, 58, 4 },
{ 2008, 2, 29, 59, 5 },
{ 2008, 3, 1, 60, 6 },
{ 2008, 12, 31, 365, 3 },
{ 2009, 1, 1, 0, 4 },
{ 2011, 1, 1, 0, 6 },
{ 2011, 2, 28, 58, 1 },
{ 2011, 3, 1, 59, 2 },
{ 2011, 12, 31, 364, 6 },
{ 2012, 1, 1, 0, 0 },
{ 2019, 1, 2, 1, 3 },
{ 2019, 2, 2, 32, 6 },
{ 2019, 3, 2, 60, 6 },
{ 2019, 4, 2, 91, 2 },
{ 2019, 5, 2, 121, 4 },
{ 2019, 6, 2, 152, 0 },
{ 2019, 7, 2, 182, 2 },
{ 2019, 8, 2, 213, 5 },
{ 2019, 9, 2, 244, 1 },
{ 2019, 10, 2, 274, 3 },
{ 2019, 11, 2, 305, 6 },
{ 2019, 12, 2, 335, 1 },
{ 2020, 1, 2, 1, 4 },
{ 2020, 2, 2, 32, 0 },
{ 2020, 3, 2, 61, 1 },
{ 2020, 4, 2, 92, 4 },
{ 2020, 5, 2, 122, 6 },
{ 2020, 6, 2, 153, 2 },
{ 2020, 7, 2, 183, 4 },
{ 2020, 8, 2, 214, 0 },
{ 2020, 9, 2, 245, 3 },
{ 2020, 10, 2, 275, 5 },
{ 2020, 11, 2, 306, 1 },
{ 2020, 12, 2, 336, 3 }
};
static int test_days(int n)
{
char d[16];
ASN1_TIME *a = NULL;
struct tm t;
int r;
BIO_snprintf(d, sizeof(d), "%04d%02d%02d050505Z",
day_of_week_tests[n].y, day_of_week_tests[n].m,
day_of_week_tests[n].d);
if (!TEST_ptr(a = ASN1_TIME_new()))
return 0;
r = TEST_true(ASN1_TIME_set_string(a, d))
&& TEST_true(ASN1_TIME_to_tm(a, &t))
&& TEST_int_eq(t.tm_yday, day_of_week_tests[n].yd)
&& TEST_int_eq(t.tm_wday, day_of_week_tests[n].wd);
ASN1_TIME_free(a);
return r;
}
void register_tests()
{
ADD_TEST(test_x509_cmp_time_current);
ADD_ALL_TESTS(test_x509_cmp_time, OSSL_NELEM(x509_cmp_tests));
ADD_ALL_TESTS(test_x509_time, OSSL_NELEM(x509_format_tests));
ADD_ALL_TESTS(test_days, OSSL_NELEM(day_of_week_tests));
}