1 files changed, 34 insertions, 20 deletions

diff --git a/src/lib/libcrypto/asn1/a_utctm.c b/src/lib/libcrypto/asn1/a_utctm.c
index fa6f40cdc9..02d511789a 100644
--- a/src/lib/libcrypto/asn1/a_utctm.c
+++ b/src/lib/libcrypto/asn1/a_utctm.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: a_utctm.c,v 1.30 2015/10/08 02:26:31 beck Exp $ */
+/* $OpenBSD: a_utctm.c,v 1.31 2015/10/08 02:29:11 beck Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -151,23 +151,37 @@ ASN1_UTCTIME_adj(ASN1_UTCTIME *s, time_t t, int offset_day, long offset_sec)
 int
 ASN1_UTCTIME_cmp_time_t(const ASN1_UTCTIME *s, time_t t)
 {
-        struct tm tm1;
-        time_t time1;
-
-        /*
-         * This funciton has never handled failure conditions properly
-         * and should be deprecated. BoringSSL makes it return -2 on
-         * failures, the OpenSSL version follows NULL pointers instead.
-         */
-        if (asn1_time_parse(s->data, s->length, &tm1, V_ASN1_UTCTIME) == -1)
-                return (-2); /* XXX */
-
-        if ((time1 = timegm(&tm1)) == -1)
-                return (-2); /* XXX */
-
-        if (time1 < t)
-                return (-1);
-        if (time1 > t)
-                return (1);
-        return (0);
+        struct tm *tm;
+        struct tm data;
+        int offset;
+        int year;
+
+#define g2(p) (((p)[0]-'0')*10+(p)[1]-'0')
+
+        if (s->data[12] == 'Z')
+                offset = 0;
+        else {
+                offset = g2(s->data + 13)*60 + g2(s->data + 15);
+                if (s->data[12] == '-')
+                        offset = -offset;
+        }
+
+        t -= offset * 60; /* FIXME: may overflow in extreme cases */
+
+        tm = gmtime_r(&t, &data);
+
+#define return_cmp(a,b) if ((a)<(b)) return -1; else if ((a)>(b)) return 1
+        year = g2(s->data);
+        if (year < 50)
+                year += 100;
+        return_cmp(year, tm->tm_year);
+        return_cmp(g2(s->data + 2) - 1, tm->tm_mon);
+        return_cmp(g2(s->data + 4), tm->tm_mday);
+        return_cmp(g2(s->data + 6), tm->tm_hour);
+        return_cmp(g2(s->data + 8), tm->tm_min);
+        return_cmp(g2(s->data + 10), tm->tm_sec);
+#undef g2
+#undef return_cmp
+
+        return 0;
 }