Function EncryptDecryptUserData

cryptography/crypto/userdata.go:29–41

default discard all logs, someone needs to set this up this function is used to encrypt/decrypt payment id,srcid and other userdata as the operation is symmetric XOR, is the same in both direction

(key [32]byte, inputs ...[]byte)

// this function is used to encrypt/decrypt payment id,srcid and other userdata
// as the operation is symmetric XOR, is the same in both direction
func EncryptDecryptUserData(key [32]byte, inputs ...[]byte) {
	var nonce [24]byte // nonce is 24 bytes, we will use xchacha20

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

	for _, input := range inputs {
		cipher.XORKeyStream(input, input)
	}
	return
}

// does an ECDH and generates a shared secret
// https://en.wikipedia.org/wiki/Elliptic_curve_Diffie%E2%80%93Hellman