Crypt::RC4 - phpMan

NAME
    Crypt::RC4 - Perl implementation of the RC4 encryption algorithm

SYNOPSIS
    # Functional Style use Crypt::RC4; $encrypted = RC4( $passphrase,
    $plaintext ); $decrypt = RC4( $passphrase, $encrypted );

    # OO Style use Crypt::RC4; $ref = Crypt::RC4->new( $passphrase );
    $encrypted = $ref->RC4( $plaintext );

      $ref2 = Crypt::RC4->new( $passphrase );
      $decrypted = $ref2->RC4( $encrypted );

    # process an entire file, one line at a time # (Warning: Encrypted file
    leaks line lengths.) $ref3 = Crypt::RC4->new( $passphrase ); while
    (<FILE>) { chomp; print $ref3->RC4($_), "\n"; }

DESCRIPTION
    A simple implementation of the RC4 algorithm, developed by RSA Security,
    Inc. Here is the description from RSA's website:

    RC4 is a stream cipher designed by Rivest for RSA Data Security (now RSA
    Security). It is a variable key-size stream cipher with byte-oriented
    operations. The algorithm is based on the use of a random permutation.
    Analysis shows that the period of the cipher is overwhelmingly likely to
    be greater than 10100. Eight to sixteen machine operations are required
    per output byte, and the cipher can be expected to run very quickly in
    software. Independent analysts have scrutinized the algorithm and it is
    considered secure.

    Based substantially on the "RC4 in 3 lines of perl" found at
    http://www.cypherspace.org

    A major bug in v1.0 was fixed by David Hook (dgh AT wumpus.au). Thanks,
    David.

AUTHOR
    Kurt Kincaid (sifukurt AT yahoo.com) Ronald Rivest for RSA Security, Inc.

BUGS
    Disclaimer: Strictly speaking, this module uses the "alleged" RC4
    algorithm. The Algorithm known as "RC4" is a trademark of RSA Security
    Inc., and this document makes no claims one way or another that this is
    the correct algorithm, and further, make no claims about the quality of
    the source code nor any licensing requirements for commercial use.

    There's nothing preventing you from using this module in an insecure way
    which leaks information. For example, encrypting multilple messages with
    the same passphrase may allow an attacker to decode all of them with
    little effort, even though they'll appear to be secured. If serious
    crypto is your goal, be careful. Be very careful.

    It's a pure-Perl implementation, so that rating of "Eight to sixteen
    machine operations" is good for nothing but a good laugh. If encryption
    and decryption are a bottleneck for you, please re-write this module to
    use native code wherever practical.

LICENSE
    This is free software and may be modified and/or redistributed under the
    same terms as Perl itself.

SEE ALSO
    perl, <http://www.cypherspace.org>, <http://www.rsasecurity.com>,
    <http://www.achtung.com/crypto/rc4.html>,
    <http://www.columbia.edu/~ariel/ssleay/rrc4.html>