twofish.BlockSize
// BlockSize is the constant block size of Twofish.
const BlockSize = 16
twofish.S
// Create the S[..] words
var S [4 * 4]byte
twofish.NewCipher
// NewCipher creates and returns a Cipher.
// The key argument should be the Twofish key, 16, 24 or 32 bytes.
func NewCipher(key []byte) (*Cipher, error)