Some basic hash functions for Go. I wrote this as my first attempt at Go.

hash.go

package hash

type Hasher interface {
    Update(uint8)
	UpdateArray([]uint8)
	Hash() uint32
	Reset()
}

const (
fnvprime	uint32 = 0x01000193
fnvoffset	uint32 = 0x811C9DC5
)

// Fowler Noll Vo hash function

type FowlerNollVo struct {
	hash 	uint32
}

func NewFowlerNollVo() *FowlerNollVo {
    return &FowlerNollVo{fnvoffset}
}

func (h *FowlerNollVo) Update(b uint8) {
	h.hash ^= uint32(b)
	h.hash *= fnvprime
}

func (h *FowlerNollVo) UpdateArray(b []uint8) {
	for _,e := range b {
		h.hash ^= uint32(e)
		h.hash *= fnvprime
	}
}

func (h *FowlerNollVo) Hash() uint32 {
	return h.hash
}

func (h *FowlerNollVo) Reset() {
	h.hash = fnvoffset
}

// Jenkins hash function

type Jenkins struct {
	hash	uint32
}

func NewJenkins() *Jenkins {
    return &Jenkins{}
}

func (h *Jenkins) Update(b uint8) {
	h.hash += uint32(b)
	h.hash += (h.hash << 10)
	h.hash ^= (h.hash >> 6)
}

func (h *Jenkins) UpdateArray(b []uint8) {
	for _,e := range b {
		h.hash += uint32(e)
		h.hash += (h.hash << 10)
		h.hash ^= (h.hash >> 6)
	}
}

func (h *Jenkins) Hash() uint32 {
	hout := h.hash
	hout += hout << 3
	hout ^= hout >> 11
	hout += hout << 15
	return hout
}

func (h *Jenkins) Reset() {
	h.hash = 0
}