INNER CODE UNIT · Go

generateKey

lightningnetwork/lightning-onion · crypto.go:136

func generateKey(keyType string, sharedKey *Hash256) [keyLen]byte {
	mac := hmac.New(sha256.New, []byte(keyType))
	mac.Write(sharedKey[:])
	h := mac.Sum(nil)

	var key [keyLen]byte
	copy(key[:], h[:keyLen])

	return key
}

// generateCipherStream generates a stream of cryptographic psuedo-random bytes
// intended to be used to encrypt a message using a one-time-pad like
// construction.
func generateCipherStream(key [keyLen]byte, numBytes uint) []byte {
	var (
		nonce [8]byte
	)

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