ledger: send derivation for change output

plugins/ledger/ledger.py

@@ -418,7 +418,12 @@ class Ledger_KeyStore(Hardware_KeyStore):
             if segwitTransaction:
                 self.get_client().startUntrustedTransaction(True, inputIndex,
                                                             chipInputs, redeemScripts[inputIndex])
-                outputData = self.get_client().finalizeInputFull(txOutput)
+                if changePath:
+                    # we don't set meaningful outputAddress, amount and fees
+                    # as we only care about the alternateEncoding==True branch
+                    outputData = self.get_client().finalizeInput(b'', 0, 0, changePath, bfh(rawTx))
+                else:
+                    outputData = self.get_client().finalizeInputFull(txOutput)
                 outputData['outputData'] = txOutput
                 transactionOutput = outputData['outputData']
                 if outputData['confirmationNeeded']:
@@ -441,7 +446,12 @@ class Ledger_KeyStore(Hardware_KeyStore):
                 while inputIndex < len(inputs):
                     self.get_client().startUntrustedTransaction(firstTransaction, inputIndex,
                                                             chipInputs, redeemScripts[inputIndex])
-                    outputData = self.get_client().finalizeInputFull(txOutput)
+                    if changePath:
+                        # we don't set meaningful outputAddress, amount and fees
+                        # as we only care about the alternateEncoding==True branch
+                        outputData = self.get_client().finalizeInput(b'', 0, 0, changePath, bfh(rawTx))
+                    else:
+                        outputData = self.get_client().finalizeInputFull(txOutput)
                     outputData['outputData'] = txOutput
                     if firstTransaction:
                         transactionOutput = outputData['outputData']