fix the int/long type in python2.7

Author: gstarovo

src/ecdsa/der.py

@@ -282,10 +282,10 @@ def remove_boolean(string):
         )
     if body == b"\x00":
         return False, rest
-    # the workaround due to instrumental, that
-    # saves the binary data as UTF-8 string
-    # (0xff is an invalid start byte)
-    if isinstance(body, text_type):
+    #  the workaround due to instrumental, that
+    #  saves the binary data as UTF-8 string
+    #  (0xff is an invalid start byte)
+    if isinstance(body, text_type):  # pragma: no branch
         body = body.encode("utf-8")
     num = int(binascii.hexlify(body), 16)
     if num == 0xFF:

src/ecdsa/ecdsa.py

@@ -81,7 +81,19 @@ class InvalidPointError(RuntimeError):
     pass
 
 
-class RValue(int):
+#  Plain integers in Python 2 are implemented using long in C,
+#  which gives them at least 32 bits of precision.
+#  Long integers have unlimited precision.
+#  In python 3 int and long were 'unified'
+
+if sys.version_info < (3, 0):  # pragma:no branch
+    # flake8 is complaining on python3
+    INT_TYPE = long  # noqa: F821
+else:
+    INT_TYPE = int
+
+
+class RValue(INT_TYPE):
     """An r signature value that also carries the originating EC point.
 
     Behaves as a regular ``int`` (equal to ``point.x() % order``) so
@@ -91,7 +103,7 @@ class RValue(int):
     """
 
     def __new__(cls, r, point):
-        obj = super(RValue, cls).__new__(cls, r)
+        obj = super(RValue, cls).__new__(cls, INT_TYPE(r))
         obj.point = point
         return obj
 

src/ecdsa/test_der.py

@@ -573,7 +573,7 @@ def test_simple_true(self):
         self.assertEqual(len(der), 3)
         self.assertEqual(der, b"\x01\x01\xff")
 
-    def test_simle_false(self):
+    def test_simple_false(self):
         der = encode_boolean(False)
         self.assertEqual(len(der), 3)
         self.assertEqual(der, b"\x01\x01\x00")

src/ecdsa/test_malformed_sigs.py

@@ -432,7 +432,7 @@ def test_random_der_ecdsa_sig_value_y_boolean(params):  # pragma: no cover
     """
     verifying_key, sig = params
 
-    # The compressed point verification is more strict than 'raw',
+    # The 'compressed' point verification is more strict than 'raw',
     # sometimes the random numbers are producing valid point, so
     # the signature verification will fail (BadSignatureError),
     # but sometimes the test will fail with trying to create a point