asn1: Support dates before 1970-01-01 (i.e. when time_t gets negative)

On x86 we allow "overflows" around 1969/1970 but not for other dates. Fixes #509.
2014-02-12 13:54:05 +01:00
parent addc34d5f0
commit ebc665be4d
3 changed files with 29 additions and 4 deletions
@@ -191,6 +191,13 @@ void asn1_debug_simple_object(chunk_t object, asn1_t type, bool private);
 /**
 * Converts an ASN.1 UTCTIME or GENERALIZEDTIME string to time_t
 *
+ * On systems where sizeof(time_t) == 4 there will be an overflow
+ * for dates
+ *   > Tue, 19 Jan 2038 03:14:07 UTC (0x7fffffff)
+ * and
+ *   < Fri, 13 Dec 1901 20:45:52 UTC (0x80000000)
+ * in both cases TIME_32_BIT_SIGNED_MAX is returned.
+ *
 * @param utctime	body of an ASN.1 coded time object
 * @param type		ASN1_UTCTIME or ASN1_GENERALIZEDTIME
 * @return			time_t in UTC