Get rid of ethereum framework dependency for Windows users, point to split contract

README.md

@@ -3,9 +3,13 @@ Ethereum wallet application framework for Ledger Blue and Nano S
 
 This follows the specification available in the doc/ folder
 
-To use the generic wallet (disabling all data transaction) refer to signTx.py (requires at least ethereum==1.1.0) or Ledger Ethereum Wallet Chrome application available on Github at https://github.com/LedgerHQ/ledger-wallet-ethereum-chrome or the Chrome Web store at https://chrome.google.com/webstore/detail/ledger-wallet-ethereum/hmlhkialjkaldndjnlcdfdphcgeadkkm    
+To use the generic wallet (which disables all data transaction) refer to signTx.py (requires rlp package) or Ledger Ethereum Wallet Chrome application available on Github at https://github.com/LedgerHQ/ledger-wallet-ethereum-chrome or the Chrome Web store at https://chrome.google.com/webstore/detail/ledger-wallet-ethereum/hmlhkialjkaldndjnlcdfdphcgeadkkm 
 
-An example application reusing the Ethereum parsing framework to implement some advanced use case (transfering The DAO (RIP) tokens) is also provided for historical reasons - not supported on Nano S and probably not compiling on Blue with the new SDK. 
+Other examples are provided reusing the Ethereum parsing framwork to implement some advanced use cases : 
 
-For more information you can refer to https://medium.com/@Ledger/dynamic-secure-applications-with-bolos-and-ledger-blue-a-use-case-with-ethereum-and-the-dao-6be91260e89f#.204qgmogo 
+  * An ETH/ETC splitting contract - see src_chainsplit, splitEther.py
+  * An unsupported use case (transferring The DAO (RIP) tokens), using deprecated code - see src_daosend 
+
+
+For more information about the parsing framework you can refer to https://medium.com/@Ledger/dynamic-secure-applications-with-bolos-and-ledger-blue-a-use-case-with-ethereum-and-the-dao-6be91260e89f#.204qgmogo 
 

ethBase.py

@@ -0,0 +1,51 @@
+#!/usr/bin/env python
+"""
+*******************************************************************************
+*   Ledger Blue
+*   (c) 2016 Ledger
+*
+*  Licensed under the Apache License, Version 2.0 (the "License");
+*  you may not use this file except in compliance with the License.
+*  You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+*  Unless required by applicable law or agreed to in writing, software
+*  distributed under the License is distributed on an "AS IS" BASIS,
+*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+*  See the License for the specific language governing permissions and
+*  limitations under the License.
+********************************************************************************
+"""
+
+from rlp.sedes import big_endian_int, binary, Binary
+from rlp import Serializable
+
+try:
+	from Crypto.Hash import keccak
+	sha3_256 = lambda x: keccak.new(digest_bits=256, data=x).digest()
+except:
+	import sha3 as _sha3
+	sha3_256 = lambda x: _sha3.sha3_256(x).digest()
+address = Binary.fixed_length(20, allow_empty=True)
+
+def sha3(seed):
+	return sha3_256(str(seed))
+
+class Transaction(Serializable):
+	fields = [
+		('nonce', big_endian_int),
+		('gasprice', big_endian_int),
+		('startgas', big_endian_int),
+		('to', address),
+		('value', big_endian_int),
+		('data', binary),
+		('v', big_endian_int),
+		('r', big_endian_int),
+		('s', big_endian_int),
+	]	
+
+	def __init__(self, nonce, gasprice, startgas, to, value, data, v=0, r=0, s=0):
+		super(Transaction, self).__init__(nonce, gasprice, startgas, to, value, data, v, r, s)
+
+UnsignedTransaction = Transaction.exclude(['v', 'r', 's'])

signTx.py

@@ -22,12 +22,10 @@ from ledgerblue.commException import CommException
 import argparse
 import struct
 from decimal import Decimal
-from ethereum.transactions import Transaction, UnsignedTransaction
+from ethBase import Transaction, UnsignedTransaction
 from rlp import encode
 from rlp.utils import decode_hex, encode_hex, str_to_bytes
 
-from ethereum import utils
-
 def parse_bip32_path(path):
 	if len(path) == 0:
 		return ""

splitEther.py

@@ -24,11 +24,9 @@ import struct
 import requests
 import json
 from decimal import Decimal
-from ethereum.transactions import Transaction, UnsignedTransaction
 from rlp import encode
 from rlp.utils import decode_hex, encode_hex, str_to_bytes
-
-from ethereum import utils
+from ethBase import Transaction, UnsignedTransaction, sha3
 
 # https://etherscan.io/address/0x5dc8108fc79018113a58328f5283b376b83922ef#code
 SPLIT_CONTRACT_FUNCTION = decode_hex("9c709343")
@@ -39,7 +37,7 @@ def rpc_call(http, url, methodDebug):
 	if req.status_code == 200:
 		result = json.loads(req.text)
 		if 'error' in result:
-			raise Exception("Server error " + methodDebug + " " + result['error']['message'])
+			raise Exception("Server error - " + methodDebug + " - " + result['error']['message'])
 		return result
 	else:
 		raise Exception("Server error - " + methodDebug + " got status " + req.status)
@@ -92,14 +90,14 @@ dongle.exchange(bytes(apdu))
 apdu = "e0020000".decode('hex') + chr(len(donglePath) + 1) + chr(len(donglePath) / 4) + donglePath
 result = dongle.exchange(bytes(apdu))
 publicKey = str(result[1 : 1 + result[0]])
-encodedPublicKey = utils.sha3(publicKey[1:])[12:]
+encodedPublicKey = sha3(publicKey[1:])[12:]
 
 if (args.nonce == None) or (args.amount == None):
 	donglePathFrom = parse_bip32_path(args.path)
 	apdu = "e0020000".decode('hex') + chr(len(donglePathFrom) + 1) + chr(len(donglePathFrom) / 4) + donglePathFrom
 	result = dongle.exchange(bytes(apdu))
 	publicKeyFrom = str(result[1 : 1 + result[0]])
-	encodedPublicKeyFrom = utils.sha3(publicKeyFrom[1:])[12:]
+	encodedPublicKeyFrom = sha3(publicKeyFrom[1:])[12:]
 
 
 http = None