Function UnpackInplace

transport/shadowsocks/shadowstream/packet.go:35–42

UnpackInplace decrypts pkt using stream cipher s. Returns a slice of pkt containing decrypted plaintext. Note: The data in the input dst will be changed

(pkt []byte, s Cipher)

// Returns a slice of pkt containing decrypted plaintext.
// Note: The data in the input dst will be changed
func UnpackInplace(pkt []byte, s Cipher) ([]byte, error) {
	if len(pkt) < s.IVSize() {
		return nil, ErrShortPacket
	}
	iv, dst := pkt[:s.IVSize()], pkt[s.IVSize():]
	s.Decrypter(iv).XORKeyStream(dst, dst)
	return dst, nil
}

// Unpack decrypts pkt using stream cipher s.
// Returns a slice of dst containing decrypted plaintext.