1 files changed, 51 insertions, 0 deletions
diff --git a/src/noise.go b/src/noise.go
new file mode 100644
index 0000000..d13bdd6
--- /dev/null
+++ b/src/noise.go
@@ -0,0 +1,51 @@
+package main
+
+import (
+	"encoding/hex"
+	"errors"
+)
+
+const (
+	NoisePublicKeySize    = 32
+	NoisePrivateKeySize   = 32
+	NoiseSymmetricKeySize = 32
+)
+
+type (
+	NoisePublicKey    [NoisePublicKeySize]byte
+	NoisePrivateKey   [NoisePrivateKeySize]byte
+	NoiseSymmetricKey [NoiseSymmetricKeySize]byte
+	NoiseNonce        uint64 // padded to 12-bytes
+)
+
+func (key *NoisePrivateKey) FromHex(s string) error {
+	slice, err := hex.DecodeString(s)
+	if err != nil {
+		return err
+	}
+	if len(slice) != NoisePrivateKeySize {
+		return errors.New("Invalid length of hex string for curve25519 point")
+	}
+	copy(key[:], slice)
+	return nil
+}
+
+func (key *NoisePrivateKey) ToHex() string {
+	return hex.EncodeToString(key[:])
+}
+
+func (key *NoisePublicKey) FromHex(s string) error {
+	slice, err := hex.DecodeString(s)
+	if err != nil {
+		return err
+	}
+	if len(slice) != NoisePublicKeySize {
+		return errors.New("Invalid length of hex string for curve25519 scalar")
+	}
+	copy(key[:], slice)
+	return nil
+}
+
+func (key *NoisePublicKey) ToHex() string {
+	return hex.EncodeToString(key[:])
+}