diff --git a/trezorlib/client.py b/trezorlib/client.py
index da80742..f233286 100644
--- a/trezorlib/client.py
+++ b/trezorlib/client.py
@@ -423,6 +423,34 @@ class ProtocolMixin(object):
         n = self._convert_prime(n)
         return self.call(proto.EthereumGetAddress(address_n=n, show_display=show_display))
 
+    def ethereum_sign_tx(self, n, nonce, gas_price, gas_limit, to, value, data=''):
+        from rlp.utils import int_to_big_endian
+
+        n = self._convert_prime(n)
+
+        try:
+            self.transport.session_begin()
+
+            response = self.call(proto.EthereumSignTx(
+                address_n=n,
+                nonce=int_to_big_endian(nonce),
+                gas_price=int_to_big_endian(gas_price),
+                gas_limit=int_to_big_endian(gas_limit),
+                to=to,
+                value=int_to_big_endian(value)))
+            if data:
+                data, chunk = data[1024:], data[:1024]
+                response.data_initial_chunk = chunk
+                response.data_length = len(data)
+
+            while response.HasField('data_length'):
+                data, chunk = data[1024:], data[:1024]
+                response = self.call(proto.EthereumTxAck(data_chunk=chunk))
+
+            return response.signature_v, response.signature_r, response.signature_s
+        finally:
+            self.transport.session_end()
+
     @field('entropy')
     @expect(proto.Entropy)
     def get_entropy(self, size):