Add ECDH support to client

trezorlib/client.py

@@ -508,6 +508,10 @@ class ProtocolMixin(object):
     def sign_identity(self, identity, challenge_hidden, challenge_visual, ecdsa_curve_name=DEFAULT_CURVE):
         return self.call(proto.SignIdentity(identity=identity, challenge_hidden=challenge_hidden, challenge_visual=challenge_visual, ecdsa_curve_name=ecdsa_curve_name))
 
+    @expect(proto.ECDHSessionKey)
+    def get_ecdh_session_key(self, identity, peer_public_key, ecdsa_curve_name=DEFAULT_CURVE):
+        return self.call(proto.GetECDHSessionKey(identity=identity, peer_public_key=peer_public_key, ecdsa_curve_name=ecdsa_curve_name))
+
     def verify_message(self, address, signature, message):
         # Convert message to UTF8 NFC (seems to be a bitcoin-qt standard)
         message = normalize_nfc(message)