mcrypt_ofb Encrypt/decrypt data in OFB mode stringmcrypt_ofb intcipher stringkey stringdata intmode stringiv stringmcrypt_ofb stringcipher stringkey stringdata intmode stringiv The first prototype is when linked against libmcrypt 2.2.x, the second when linked against libmcrypt 2.4.x. 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.