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lws_tls_openssl_asn1time_to_unix: fix 13 char asn1 epoch

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Also align to struct tm's year epoch of 1900

https://github.com/warmcat/libwebsockets/issues/3341
This commit is contained in:
Andy Green 2025-02-24 11:16:20 +00:00
parent 7333fcc9cd
commit 5d1947474e
1 changed files with 5 additions and 3 deletions
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8
lib/tls/openssl/openssl-x509.c
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@ -47,11 +47,13 @@ lws_tls_openssl_asn1time_to_unix(ASN1_TIME *as)
memset(&t, 0, sizeof(t));
if (strlen(p) == 13) {
t.tm_year = (dec(p[0]) * 10) + dec(p[1]) + 100;
t.tm_year = (dec(p[0]) * 10) + dec(p[1]);
if (t.tm_year < 50) /* RFC5280: 13 char dates will break after 2049 */
t.tm_year += 100; /* struct tm year is -1900, this gives 2000..2049 */
p += 2;
} else {
t.tm_year = (dec(p[0]) * 1000) + (dec(p[1]) * 100) +
(dec(p[2]) * 10) + dec(p[3]);
t.tm_year = ((dec(p[0]) * 1000) + (dec(p[1]) * 100) +
(dec(p[2]) * 10) + dec(p[3])) - 1900; /* struct tm year is -1900 */
p += 4;
}
t.tm_mon = (dec(p[0]) * 10) + dec(p[1]) - 1;