initial pintos checkin

1 files changed, 29 insertions, 0 deletions

diff --git a/pintos-progos/tests/arc4.pm b/pintos-progos/tests/arc4.pm
new file mode 100644
index 0000000..df19216
--- /dev/null
+++ b/pintos-progos/tests/arc4.pm
@@ -0,0 +1,29 @@
+use strict;
+use warnings;
+
+sub arc4_init {
+    my ($key) = @_;
+    my (@s) = 0...255;
+    my ($j) = 0;
+    for my $i (0...255) {
+        $j = ($j + $s[$i] + ord (substr ($key, $i % length ($key), 1))) & 0xff;
+        @s[$i, $j] = @s[$j, $i];
+    }
+    return (0, 0, @s);
+}
+
+sub arc4_crypt {
+    my ($arc4, $buf) = @_;
+    my ($i, $j, @s) = @$arc4;
+    my ($out) = "";
+    for my $c (split (//, $buf)) {
+        $i = ($i + 1) & 0xff;
+        $j = ($j + $s[$i]) & 0xff;
+        @s[$i, $j] = @s[$j, $i];
+        $out .= chr (ord ($c) ^ $s[($s[$i] + $s[$j]) & 0xff]);
+    }
+    @$arc4 = ($i, $j, @s);
+    return $out;
+}
+
+1;