Remove eth_keys, web3 dependencies

crypto_dev_signer/eth/signer/defaultsigner.py

@@ -1,11 +1,15 @@
+# standard imports
 import logging
+
+# external imports
 import sha3
+import coincurve
+#from eth_keys import KeyAPI
+#from eth_keys.backends import NativeECCBackend
 
-from eth_keys import KeyAPI
-from eth_keys.backends import NativeECCBackend
-
-keys = KeyAPI(NativeECCBackend)
-logg = logging.getLogger(__name__)
+#keys = KeyAPI(NativeECCBackend)
+#logg = logging.getLogger(__name__)
+logg = logging.getLogger()
 
 
 class Signer:
@@ -31,9 +35,9 @@ class ReferenceSigner(Signer):
         s = tx.rlp_serialize()
         h = sha3.keccak_256()
         h.update(s)
-        g = h.digest()
-        k = keys.PrivateKey(self.keyGetter.get(tx.sender, password))
-        z = keys.ecdsa_sign(message_hash=g, private_key=k)
+        message_to_sign = h.digest()
+        z = self.sign(tx.sender, message_to_sign, password)
+
         vnum = int.from_bytes(tx.v, 'big')
         v = (vnum * 2) + 35 + z[64]
         byts = ((v.bit_length()-1)/8)+1
@@ -55,17 +59,30 @@ class ReferenceSigner(Signer):
 
 
     def signEthereumMessage(self, address, message, password=None):
-        #msg = b'\x19Ethereum Signed Message:\n{}{}'.format(len(message), message)
-        k = keys.PrivateKey(self.keyGetter.get(address, password))
+        
+        #k = keys.PrivateKey(self.keyGetter.get(address, password))
         #z = keys.ecdsa_sign(message_hash=g, private_key=k)
-        z = None
         if type(message).__name__ == 'str':
             logg.debug('signing message in "str" format: {}'.format(message))
-            z = k.sign_msg(bytes.fromhex(message))
+            #z = k.sign_msg(bytes.fromhex(message))
+            message = bytes.fromhex(message)
         elif type(message).__name__ == 'bytes':
             logg.debug('signing message in "bytes" format: {}'.format(message.hex()))
-            z = k.sign_msg(message)
+            #z = k.sign_msg(message)
         else:
+            logg.debug('unhandled format {}'.format(type(message).__name__))
             raise ValueError('message must be type str or bytes, received {}'.format(type(message).__name__))
+
+        ethereumed_message_header = b'\x19' + 'Ethereum Signed Message:\n{}'.format(len(message)).encode('utf-8')
+        h = sha3.keccak_256()
+        h.update(ethereumed_message_header + message)
+        message_to_sign = h.digest()
+
+        z = self.sign(address, message_to_sign, password)
         return z
 
+
+    def sign(self, address, message, password=None):
+        pk = coincurve.PrivateKey(secret=self.keyGetter.get(address, password))
+        z = pk.sign(hasher=None, message=message)
+        return z