Dave Paris

NAME

IDEA - Perl interface to IDEA block cipher

SYNOPSIS

    use Crypt::IDEA;
    

DESCRIPTION

This perl extension is an implementation of the IDEA block cipher algorithm. The module implements the Crypt::BlockCipher interface, which has the following methods

blocksize =item keysize =item encrypt =item decrypt

FUNCTIONS

blocksize

Returns the size (in bytes) of the block cipher.

keysize

Returns the size (in bytes) of the key.

new
        my $cipher = new IDEA $key;

This creates a new IDEA BlockCipher object, using $key, where $key is a key of keysize() bytes.

encrypt
        my $cipher = new IDEA $key;
        my $ciphertext = $cipher->encrypt($plaintext);

This function encrypts $plaintext and returns the $ciphertext where $plaintext and $ciphertext should be of blocksize() bytes.

decrypt
        my $cipher = new IDEA $key;
        my $plaintext = $cipher->decrypt($ciphertext);

This function decrypts $ciphertext and returns the $plaintext where $plaintext and $ciphertext should be of blocksize() bytes.

EXAMPLE

        my $key = pack("H32", "0123456789ABCDEF0123456789ABCDEF");
        my $cipher = new IDEA $key;
        my $ciphertext = $cipher->encrypt("plaintex");  # NB - 8 bytes
        print unpack("H16", $ciphertext), "\n";

SEE ALSO

Crypt::CBD, Crypt::DES, Crypt::Blowfish

Bruce Schneier, Applied Cryptography, 1995, Second Edition, published by John Wiley & Sons, Inc.

COPYRIGHT

This implementation is copyright Systemics Ltd ( http://www.systemics.com/ ).

The IDEA algorithm is patented in Europe and the United States by Ascom-Tech AG.

Module altered between 1999 and 2005 to allow added functionality with perl -MCPAN, Changes by Dave Paris (edited lib paths, endian issues, new tests).

Thank you to contributors for endian patches and new test suite!