Added Ethereum Sign/Verify Message (#35)

protob/messages.proto

@@ -72,6 +72,9 @@ enum MessageType {
 	MessageType_GetECDHSessionKey = 61 [(wire_in) = true];
 	MessageType_ECDHSessionKey = 62 [(wire_out) = true];
 	MessageType_SetU2FCounter = 63 [(wire_in) = true];
+	MessageType_EthereumSignMessage = 64 [(wire_in) = true];
+	MessageType_EthereumVerifyMessage = 65 [(wire_in) = true];
+	MessageType_EthereumMessageSignature = 66 [(wire_out) = true];
 	MessageType_DebugLinkDecision = 100 [(wire_debug_in) = true, (wire_tiny) = true];
 	MessageType_DebugLinkGetState = 101 [(wire_debug_in) = true];
 	MessageType_DebugLinkState = 102 [(wire_debug_out) = true];
@@ -659,6 +662,40 @@ message EthereumTxAck {
 	optional bytes data_chunk = 1;			// Bytes from transaction payload (<= 1024 bytes)
 }
 
+////////////////////////////////////////
+// Ethereum: Message signing messages //
+////////////////////////////////////////
+
+/**
+ * Request: Ask device to sign message
+ * @next EthereumMessageSignature
+ * @next Failure
+ */
+message EthereumSignMessage {
+	repeated uint32 address_n = 1;				// BIP-32 path to derive the key from master node
+	required bytes message = 2;				// message to be signed
+}
+
+/**
+ * Request: Ask device to verify message
+ * @next Success
+ * @next Failure
+ */
+message EthereumVerifyMessage {
+	optional bytes address = 1;				// address to verify
+	optional bytes signature = 2;				// signature to verify
+	optional bytes message = 3;				// message to verify
+}
+
+/**
+ * Response: Signed message
+ * @prev EthereumSignMessage
+ */
+message EthereumMessageSignature {
+	optional bytes address = 1;				// address used to sign the message
+	optional bytes signature = 2;				// signature of the message
+}
+
 ///////////////////////
 // Identity messages //
 ///////////////////////