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 or higher. This function should not be used anymore, see mcrypt_generic and mdecrypt_generic for replacements.