Initial commit

src/common.py

@@ -0,0 +1,5 @@
+def strip_hex_prefix(hx):
+    if hx[:2] == '0x':
+        return hx[2:]
+    return hx
+

src/signer/__init__.py

@@ -0,0 +1 @@
+from signer.defaultsigner import ReferenceSigner, Signer

src/signer/defaultsigner.py

@@ -0,0 +1,39 @@
+import logging
+import sha3
+
+from eth_keys import KeyAPI
+from eth_keys.backends import NativeECCBackend
+
+keys = KeyAPI(NativeECCBackend)
+logg = logging.getLogger(__name__)
+
+
+class Signer:
+
+    def __init__(self, keyGetter):
+        self.keyGetter = keyGetter
+
+    def signTransaction(self, tx):
+        raise NotImplementedError
+
+
+class ReferenceSigner(Signer):
+    
+    def __init__(self, keyGetter):
+        super(ReferenceSigner, self).__init__(keyGetter)
+
+
+    def signTransaction(self, tx):
+        s = tx.serialize()
+        h = sha3.keccak_256()
+        h.update(s)
+        g = h.digest()
+        k = keys.PrivateKey(self.keyGetter(tx.sender))
+        z = keys.ecdsa_sign(message_hash=g, private_key=k)
+        tx.v = (tx.v * 2) + 35 + z[64]
+        tx.r = z[:32]
+        tx.s = z[32:64]
+        return z
+
+
+

src/transaction.py

@@ -0,0 +1,42 @@
+import logging
+import binascii
+
+from rlp import encode as rlp_encode
+
+from common import strip_hex_prefix
+
+logg = logging.getLogger(__name__)
+
+class Transaction:
+
+    def __init__(self, tx, nonce, chainId=1):
+       
+        to = binascii.unhexlify(strip_hex_prefix(tx['to']))
+        data = binascii.unhexlify(strip_hex_prefix(tx['data']))
+
+        self.nonce = nonce
+        self.gas_price = int(tx['gasPrice'])
+        self.start_gas = int(tx['gas'])
+        self.to = to
+        self.value = int(tx['value'])
+        self.data = data
+        self.v = chainId
+        self.r = 0
+        self.s = 0
+        self.sender = tx['from']
+
+
+    def serialize(self):
+        b = self.nonce.to_bytes(8, byteorder='little')
+        s = [
+            self.nonce,
+            self.gas_price,
+            self.start_gas,
+            self.to,
+            self.value,
+            self.data,
+            self.v,
+            self.r,
+            self.s,
+                ]
+        return rlp_encode(s)