hashenc

type Encoder interface {
	// Encode encodes the data at src into dst
	Encode(dst []byte, src []byte)

	// EncodedLen returns the encoded length for input data of supplied length
	EncodedLen(int) int
}

type HashEncoder interface {
	// EncodeSum calculates the hash sum of src and encodes (at most) Size() into dst
	EncodeSum(dst []byte, src []byte)

	// EncodedSum calculates the encoded hash sum of src and returns data in a newly allocated bytes.Bytes
	EncodedSum(src []byte) bytes.Bytes

	// Size returns the expected length of encoded hashes
	Size() int
}