question: @ Override public String toString ( ) { String ivString = Base64 . encodeToString ( iv , BASE64_FLAGS ) ; String cipherTextString = Base64 . encodeToString ( cipherText , BASE64_FLAGS ) ; String macString = Base64 . encodeToString ( mac , BASE64_FLAGS ) ; return String . format ( ivString + ":" + macString + ":" + cipherTextString ) ; }
target:  Encodes this ciphertext, IV, mac as a string.