INNER CODE UNIT · Go

calcMac

lightningnetwork/lightning-onion · crypto.go:108

func calcMac(key [keyLen]byte, msg []byte) [HMACSize]byte {
	hmac := hmac.New(sha256.New, key[:])
	hmac.Write(msg)
	h := hmac.Sum(nil)

	var mac [HMACSize]byte
	copy(mac[:], h[:HMACSize])

	return mac
}

// xor computes the byte wise XOR of a and b, storing the result in dst. Only
// the frist `min(len(a), len(b))` bytes will be xor'd.
func xor(dst, a, b []byte) int {
	n := len(a)
	if len(b) < n {
		n = len(b)
	}

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