Rip the guts out of another gibbering horror of a time comparison function, and

mark it as #ifndef LIBRESSL_INTERNAL at least we don't use this.
ok jsing@

2 files changed, 24 insertions, 37 deletions

diff --git a/lib/libcrypto/asn1/a_utctm.c b/lib/libcrypto/asn1/a_utctm.c
index 02d511789ab..495c497bc8d 100644
--- a/lib/libcrypto/asn1/a_utctm.c
+++ b/lib/libcrypto/asn1/a_utctm.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: a_utctm.c,v 1.31 2015/10/08 02:29:11 beck Exp $ */
+/* $OpenBSD: a_utctm.c,v 1.32 2015/10/08 02:42:58 beck Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -149,39 +149,25 @@ 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)
+ASN1_UTCTIME_cmp_time_t(const ASN1_UTCTIME *s, time_t t2)
 {
-	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;
+	struct tm tm1;
+	time_t t1;
+
+	/*
+	 * This function 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 ((t1 = timegm(&tm1)) == -1)
+		return (-2); /* XXX */
+
+	if (t1 < t2)
+		return (-1);
+	if (t1 > t2)
+		return (1);
+	return (0);
 }
diff --git a/lib/libcrypto/asn1/asn1.h b/lib/libcrypto/asn1/asn1.h
index d1626944b7e..9905df5f74e 100644
--- a/lib/libcrypto/asn1/asn1.h
+++ b/lib/libcrypto/asn1/asn1.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: asn1.h,v 1.32 2015/10/08 02:29:11 beck Exp $ */
+/* $OpenBSD: asn1.h,v 1.33 2015/10/08 02:42:58 beck Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -812,8 +812,9 @@ ASN1_UTCTIME *ASN1_UTCTIME_set(ASN1_UTCTIME *s, time_t t);
 ASN1_UTCTIME *ASN1_UTCTIME_adj(ASN1_UTCTIME *s, time_t t,
     int offset_day, long offset_sec);
 int ASN1_UTCTIME_set_string(ASN1_UTCTIME *s, const char *str);
+#ifndef LIBRESSL_INTERNAL
 int ASN1_UTCTIME_cmp_time_t(const ASN1_UTCTIME *s, time_t t);
-
+#endif
 int ASN1_GENERALIZEDTIME_check(ASN1_GENERALIZEDTIME *a);
 ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_set(ASN1_GENERALIZEDTIME *s,
     time_t t);