INNER CODE UNIT · Go

h

lightningnetwork/lightning-onion · crypto.go:139

	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
	)
	cipher, err := chacha20.NewCipher(nonce[:], key[:])
	if err != nil {
		panic(err)

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