CS代考计算机代写 use strict;

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;