choose_tx_from account, and use deterministic signatures (issue #323)

gui/qt/main_window.py

@@ -794,7 +794,7 @@ class ElectrumWindow(QMainWindow):
             if self.amount_e.is_shortcut:
                 self.amount_e.is_shortcut = False
                 c, u = self.wallet.get_account_balance(self.current_account)
-                inputs, total, fee = self.wallet.choose_tx_inputs( c + u, 0, self.current_account)
+                inputs, total, fee = self.wallet.choose_tx_inputs_from_account( c + u, 0, self.current_account)
                 fee = self.wallet.estimated_fee(inputs)
                 amount = c + u - fee
                 self.amount_e.setText( self.format_amount(amount) )
@@ -807,7 +807,7 @@ class ElectrumWindow(QMainWindow):
             if not is_fee: fee = None
             if amount is None:
                 return
-            inputs, total, fee = self.wallet.choose_tx_inputs( amount, fee, self.current_account )
+            inputs, total, fee = self.wallet.choose_tx_inputs_from_account( amount, fee, self.current_account )
             if not is_fee:
                 self.fee_e.setText( self.format_amount( fee ) )
             if inputs:
@@ -1676,7 +1676,7 @@ class ElectrumWindow(QMainWindow):
         def do_verify():
             message = unicode(verify_message.toPlainText())
             message = message.encode('utf-8')
-            if self.wallet.verify_message(verify_address.text(), str(verify_signature.toPlainText()), message):
+            if bitcoin.verify_message(verify_address.text(), str(verify_signature.toPlainText()), message):
                 self.show_message(_("Signature verified"))
             else:
                 self.show_message(_("Error: wrong signature"))

lib/bitcoin.py

@@ -272,18 +272,9 @@ def is_valid(addr):
 
 ########### end pywallet functions #######################
 
-# secp256k1, http://www.oid-info.com/get/1.3.132.0.10
-_p = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2FL
-_r = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141L
-_b = 0x0000000000000000000000000000000000000000000000000000000000000007L
-_a = 0x0000000000000000000000000000000000000000000000000000000000000000L
-_Gx = 0x79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798L
-_Gy = 0x483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8L
-curve_secp256k1 = ecdsa.ellipticcurve.CurveFp( _p, _a, _b )
-generator_secp256k1 = ecdsa.ellipticcurve.Point( curve_secp256k1, _Gx, _Gy, _r )
-oid_secp256k1 = (1,3,132,0,10)
-SECP256k1 = ecdsa.curves.Curve("SECP256k1", curve_secp256k1, generator_secp256k1, oid_secp256k1 ) 
 
+from ecdsa.ecdsa import curve_secp256k1, generator_secp256k1
+from ecdsa.curves import SECP256k1
 from ecdsa.util import string_to_number, number_to_string
 
 def msg_magic(message):
@@ -293,6 +284,16 @@ def msg_magic(message):
     return "\x18Bitcoin Signed Message:\n" + encoded_varint + message
 
 
+def verify_message(address, signature, message):
+    try:
+        EC_KEY.verify_message(address, signature, message)
+        return True
+    except BaseException as e:
+        print_error("Verification error: {0}".format(e))
+        return False
+
+
+
 class EC_KEY(object):
     def __init__( self, secret ):
         self.pubkey = ecdsa.ecdsa.Public_key( generator_secp256k1, generator_secp256k1 * secret )
@@ -302,7 +303,7 @@ class EC_KEY(object):
     def sign_message(self, message, compressed, address):
         private_key = ecdsa.SigningKey.from_secret_exponent( self.secret, curve = SECP256k1 )
         public_key = private_key.get_verifying_key()
-        signature = private_key.sign_digest( Hash( msg_magic(message) ), sigencode = ecdsa.util.sigencode_string )
+        signature = private_key.sign_digest_deterministic( Hash( msg_magic(message) ), hashfunc=hashlib.sha256, sigencode = ecdsa.util.sigencode_string )
         assert public_key.verify_digest( signature, Hash( msg_magic(message) ), sigdecode = ecdsa.util.sigdecode_string)
         for i in range(4):
             sig = base64.b64encode( chr(27 + i + (4 if compressed else 0)) + signature )

lib/commands.py

@@ -233,7 +233,7 @@ class Commands:
 
 
     def verifymessage(self, address, signature, message):
-        return self.wallet.verify_message(address, signature, message)
+        return bitcoin.verify_message(address, signature, message)
 
 
     def _mktx(self, outputs, fee = None, change_addr = None, domain = None):

lib/transaction.py

@@ -524,7 +524,7 @@ class Transaction:
                     secexp = pkey.secret
                     private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
                     public_key = private_key.get_verifying_key()
-                    sig = private_key.sign_digest( Hash( tx_for_sig.decode('hex') ), sigencode = ecdsa.util.sigencode_der )
+                    sig = private_key.sign_digest_deterministic( Hash( tx_for_sig.decode('hex') ), hashfunc=hashlib.sha256, sigencode = ecdsa.util.sigencode_der )
                     assert public_key.verify_digest( sig, Hash( tx_for_sig.decode('hex') ), sigdecode = ecdsa.util.sigdecode_der)
                     signatures.append( sig.encode('hex') )
                     print_error("adding signature for", pubkey)

lib/wallet.py

@@ -673,14 +673,6 @@ class Wallet:
         compressed = is_compressed(sec)
         return key.sign_message(message, compressed, address)
 
-    def verify_message(self, address, signature, message):
-        try:
-            EC_KEY.verify_message(address, signature, message)
-            return True
-        except BaseException as e:
-            print_error("Verification error: {0}".format(e))
-            return False
-
 
     def change_gap_limit(self, value):
         if value >= self.gap_limit:
@@ -1005,6 +997,11 @@ class Wallet:
 
 
 
+    def choose_tx_inputs_from_account( self, amount, fixed_fee, account ):
+        domain = self.get_account_addresses(account) if account else None
+        return self.choose_tx_inputs( amount, fixed_fee, domain )
+
+
     def choose_tx_inputs( self, amount, fixed_fee, domain = None ):
         """ todo: minimize tx size """
         total = 0