From 4e46f352f85f2a424bd4990c4a8355d9cceeb4d9 Mon Sep 17 00:00:00 2001
From: fishsoupisgood <github@madingley.org>
Date: Thu, 10 May 2018 11:12:43 +0100
Subject: only decode if the minuite is right

---
 decode.pl | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/decode.pl b/decode.pl
index 9d25ffc..2f7dc43 100755
--- a/decode.pl
+++ b/decode.pl
@@ -714,8 +714,6 @@ for ( my $i = 0 ; $i < ( $n - 2 ) ; ++$i ) {
     my ( $data_bits, $key_bits ) =
       extract( $d->[$i], $d->[ $i + 1 ], $d->[ $i + 2 ] );
 
-    my $plain = decrypt( $data_bits, $key_bits );
-    next unless defined($plain);
 
     my $min   = le_bcd_to_int( substr( $key_bits, 0,  8 ) );
     my $hour  = le_bcd_to_int( substr( $key_bits, 8,  8 ) );
@@ -726,6 +724,12 @@ for ( my $i = 0 ; $i < ( $n - 2 ) ; ++$i ) {
 
     my $mins_since_midnight = $min + ( $hour * 60 );
 
+    next unless ( $mins_since_midnight %3) == 2;
+
+    my $plain = decrypt( $data_bits, $key_bits );
+
+    next unless defined $plain ;
+
     my $dt = DateTime->new(
         year  => $year,
         month => $month,
-- 
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