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etherhash.go

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package outscript

import (

"hash"

"golang.org/x/crypto/sha3"

)

type etherHash struct {

h hash.Hash

}

func newEtherHash() hash.Hash {

return &etherHash{}

}

func (e *etherHash) Reset() {

e.h = nil

}

func (e *etherHash) Write(b []byte) (int, error) {

if len(b) == 0 {

return 0, nil

}

if e.h == nil {

e.h = sha3.NewLegacyKeccak256()

n, err := e.h.Write(b[1:])

return n + 1, err

}

return e.h.Write(b)

}

func (e *etherHash) Sum(b []byte) []byte {

return append(b, e.h.Sum(nil)[12:]...)

}

func (e *etherHash) Size() int {

return 20

}

func (e *etherHash) BlockSize() int {

if e.h != nil {

return e.h.BlockSize()

}

return 136

}