From dad75b54f090a45a23a2979446920e2911d7979e Mon Sep 17 00:00:00 2001
From: Rob De Feo <robdefeo@gmail.com>
Date: Sun, 5 Jan 2020 15:24:54 +0000
Subject: [PATCH] feat: create key exchange (#497)

* create key exchange

* missing import statement
---
 crypto/cipher/keyexchange.go | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 crypto/cipher/keyexchange.go

diff --git a/crypto/cipher/keyexchange.go b/crypto/cipher/keyexchange.go
new file mode 100644
index 000000000..b55e81302
--- /dev/null
+++ b/crypto/cipher/keyexchange.go
@@ -0,0 +1,13 @@
+package cipher
+
+import (
+	"github.com/mailchain/mailchain/crypto"
+)
+
+type KeyExchange interface {
+	// EphemeralKey generates a private/public key pair.
+	EphemeralKey() (private crypto.PrivateKey, public crypto.PublicKey, err error)
+
+	// SharedSecret computes a secret value from ephemeralKey private key and recipientKey public key.
+	SharedSecret(ephemeralKey crypto.PrivateKey, recipientKey crypto.PublicKey) ([]byte, error)
+}