string mcrypt_ofb (int cipher, string key, string data, int mode, string iv)
Mcrypt_ofb() encrypts or decrypts (depending on mode) the data with cipher and key in OFB cipher mode and returns the resulting string.
Cipher is one of the MCRYPT_ciphername constants.
Key is the key supplied to the algorithm. It must be kept secret.
Data is the data which shall be encrypted/decrypted.
Mode is MCRYPT_ENCRYPT or MCRYPT_DECRYPT.
IV is the initialization vector.
See also: mcrypt_cbc(), mcrypt_cfb(), and mcrypt_ecb().