Rabbit stream cipher implementation http://tools.ietf.org/rfc/rfc4503.txt

Rabbit is a stream cipher algorithm that has been designed for high performance in software implementations. Both key setup and encryption are very fast, making the algorithm particularly suited for all applications where large amounts of data or large numbers of data packages have to be encrypted.

Usage:

    byte[] msg = "Hello World!".getBytes();
    RabbitCipher cipher = new RabbitCipher();
    cipher.setupKey(key);
    cipher.crypt(msg);

Currently IV usage not implemented.