Style fixes

.travis.yml

@@ -43,6 +43,10 @@ matrix:
         env: TOX_ENV=py37
         dist: xenial
         sudo: true
+      - python: 3.8
+        env: TOX_ENV=codechecks
+        dist: xenial
+        sudo: true
       - python: 3.8
         env: TOX_ENV=py38
         dist: xenial

setup.py

@@ -42,7 +42,7 @@
       ],
       install_requires=['six>=1.9.0'],
       extras_require={
-            'gmpy2': 'gmpy2',
-            'gmpy': 'gmpy',
-          },
+          'gmpy2': 'gmpy2',
+          'gmpy': 'gmpy',
+      },
       )

speed.py

@@ -14,7 +14,8 @@ def do(setup_statements, statement):
             break
     return x / number
 
-prnt_form = ("{name:>16}{sep:1} {siglen:>6} {keygen:>9{form}}{unit:1} "
+prnt_form = (
+    "{name:>16}{sep:1} {siglen:>6} {keygen:>9{form}}{unit:1} "
     "{keygen_inv:>9{form_inv}} {sign:>9{form}}{unit:1} "
     "{sign_inv:>9{form_inv}} {verify:>9{form}}{unit:1} "
     "{verify_inv:>9{form_inv}}")
@@ -49,7 +50,8 @@ def do(setup_statements, statement):
 
 print('')
 
-ecdh_form = ("{name:>16}{sep:1} {ecdh:>9{form}}{unit:1} "
+ecdh_form = (
+    "{name:>16}{sep:1} {ecdh:>9{form}}{unit:1} "
     "{ecdh_inv:>9{form_inv}}")
 
 print(ecdh_form.format(ecdh="ecdh", ecdh_inv="ecdh/s", name="", sep="",

src/ecdsa/__init__.py

@@ -1,8 +1,8 @@
 from .keys import SigningKey, VerifyingKey, BadSignatureError, BadDigestError,\
-        MalformedPointError
+    MalformedPointError
 from .curves import NIST192p, NIST224p, NIST256p, NIST384p, NIST521p,\
-        SECP256k1, BRAINPOOLP160r1, BRAINPOOLP192r1, BRAINPOOLP224r1,\
-        BRAINPOOLP256r1, BRAINPOOLP320r1, BRAINPOOLP384r1, BRAINPOOLP512r1
+    SECP256k1, BRAINPOOLP160r1, BRAINPOOLP192r1, BRAINPOOLP224r1,\
+    BRAINPOOLP256r1, BRAINPOOLP320r1, BRAINPOOLP384r1, BRAINPOOLP512r1
 from .ecdh import ECDH, NoKeyError, NoCurveError, InvalidCurveError, \
     InvalidSharedSecretError
 from .der import UnexpectedDER

src/ecdsa/_compat.py

@@ -16,7 +16,8 @@ def str_idx_as_int(string, index):
 if sys.version_info < (3, 0):
     def normalise_bytes(buffer_object):
         """Cast the input into array of bytes."""
-        return buffer(buffer_object)
+        # flake8 runs on py3 where `buffer` indeed doesn't exist...
+        return buffer(buffer_object)  # noqa: F821
 
     def hmac_compat(ret):
         return ret

src/ecdsa/curves.py

@@ -9,7 +9,7 @@
 __all__ = ["UnknownCurveError", "orderlen", "Curve", "NIST192p",
            "NIST224p", "NIST256p", "NIST384p", "NIST521p", "curves",
            "find_curve", "SECP256k1", "BRAINPOOLP160r1", "BRAINPOOLP192r1",
-           "BRAINPOOLP224r1", "BRAINPOOLP256r1" "BRAINPOOLP320r1",
+           "BRAINPOOLP224r1", "BRAINPOOLP256r1", "BRAINPOOLP320r1",
            "BRAINPOOLP384r1", "BRAINPOOLP512r1"]
 
 
@@ -115,7 +115,7 @@ def __repr__(self):
 
 
 curves = [NIST192p, NIST224p, NIST256p, NIST384p, NIST521p, SECP256k1,
-          BRAINPOOLP160r1, BRAINPOOLP192r1,  BRAINPOOLP224r1, BRAINPOOLP256r1,
+          BRAINPOOLP160r1, BRAINPOOLP192r1, BRAINPOOLP224r1, BRAINPOOLP256r1,
           BRAINPOOLP320r1, BRAINPOOLP384r1, BRAINPOOLP512r1]
 
 

src/ecdsa/ecdh.py

@@ -38,8 +38,8 @@ class InvalidSharedSecretError(Exception):
 class ECDH(object):
     """
     Elliptic-curve Diffie-Hellman (ECDH). A key agreement protocol.
-    
-    Allows two parties, each having an elliptic-curve public-private key 
+
+    Allows two parties, each having an elliptic-curve public-private key
     pair, to establish a shared secret over an insecure channel
     """""
 
@@ -283,8 +283,8 @@ def generate_sharedsecret_bytes(self):
         :rtype: byte string
         """
         return number_to_string(
-                    self.generate_sharedsecret(),
-                    self.private_key.curve.order)
+            self.generate_sharedsecret(),
+            self.private_key.curve.order)
 
     def generate_sharedsecret(self):
         """

src/ecdsa/ecdsa.py

@@ -139,10 +139,10 @@ def __init__(self, generator, point, verify=True):
       raise InvalidPointError("Generator point order is bad.")
 
   def __eq__(self, other):
-    if isinstance(other, Public_key):    
+    if isinstance(other, Public_key):
       """Return True if the points are identical, False otherwise."""
       return self.curve == other.curve \
-        and self.point == other.point
+          and self.point == other.point
     return NotImplemented
 
   def verifies(self, hash, signature):
@@ -182,12 +182,12 @@ def __init__(self, public_key, secret_multiplier):
 
     self.public_key = public_key
     self.secret_multiplier = secret_multiplier
-    
+
   def __eq__(self, other):
-    if isinstance(other, Private_key):    
+    if isinstance(other, Private_key):
       """Return True if the points are identical, False otherwise."""
       return self.public_key == other.public_key \
-        and self.secret_multiplier == other.secret_multiplier
+          and self.secret_multiplier == other.secret_multiplier
     return NotImplemented
 
   def sign(self, hash, random_k):
@@ -220,8 +220,8 @@ def sign(self, hash, random_k):
     r = p1.x() % n
     if r == 0:
       raise RSZeroError("amazingly unlucky random number r")
-    s = (numbertheory.inverse_mod(k, n) *
-         (hash + (self.secret_multiplier * r) % n)) % n
+    s = (numbertheory.inverse_mod(k, n)
+         * (hash + (self.secret_multiplier * r) % n)) % n
     if s == 0:
       raise RSZeroError("amazingly unlucky random number s")
     return Signature(r, s)
@@ -277,8 +277,8 @@ def point_is_valid(generator, x, y):
   if not curve.contains_point(x, y):
     return False
   if curve.cofactor() != 1 and \
-        not n * ellipticcurve.PointJacobi(curve, x, y, 1)\
-        == ellipticcurve.INFINITY:
+      not n * ellipticcurve.PointJacobi(curve, x, y, 1)\
+          == ellipticcurve.INFINITY:
     return False
   return True
 
@@ -361,7 +361,7 @@ def point_is_valid(generator, x, y):
 generator_secp256k1 = ellipticcurve.PointJacobi(
     curve_secp256k1, _Gx, _Gy, 1, _r, generator=True)
 
- # Brainpool P-160-r1
+# Brainpool P-160-r1
 _a = 0x340E7BE2A280EB74E2BE61BADA745D97E8F7C300
 _b = 0x1E589A8595423412134FAA2DBDEC95C8D8675E58
 _p = 0xE95E4A5F737059DC60DFC7AD95B3D8139515620F

src/ecdsa/ellipticcurve.py

@@ -37,13 +37,13 @@
 
 try:
     from gmpy2 import mpz
-    GMPY=True
+    GMPY = True
 except ImportError:
     try:
         from gmpy import mpz
-        GMPY=True
+        GMPY = True
     except ImportError:
-        GMPY=False
+        GMPY = False
 
 
 from six import python_2_unicode_compatible
@@ -84,13 +84,13 @@ def __init__(self, p, a, b, h=None):
         self.__a = a
         self.__b = b
         self.__h = h
-    
+
   def __eq__(self, other):
-    if isinstance(other, CurveFp):    
+    if isinstance(other, CurveFp):
       """Return True if the curves are identical, False otherwise."""
       return self.__p == other.__p \
-        and self.__a == other.__a \
-        and self.__b == other.__b
+          and self.__a == other.__a \
+          and self.__b == other.__b
     return NotImplemented
 
   def __hash__(self):
@@ -155,7 +155,7 @@ def __init__(self, curve, x, y, z, order=None, generator=False):
           self.__y = y
           self.__z = z
           self.__order = order
-      self.__precompute=[]
+      self.__precompute = []
       if generator:
           assert order
           i = 1
@@ -192,7 +192,7 @@ def __eq__(self, other):
       # compare the fractions by bringing them to the same denominator
       # depend on short-circuit to save 4 multiplications in case of inequality
       return (x1 * zz2 - x2 * zz1) % p == 0 and \
-              (y1 * zz2 * z2 - y2 * zz1 * z1) % p == 0
+             (y1 * zz2 * z2 - y2 * zz1 * z1) % p == 0
 
   def order(self):
       """Return the order of the point.
@@ -604,10 +604,10 @@ def __init__(self, curve, x, y, order=None):
 
   def __eq__(self, other):
     """Return True if the points are identical, False otherwise."""
-    if isinstance(other, Point):  
+    if isinstance(other, Point):
       return self.__curve == other.__curve \
-        and self.__x == other.__x \
-        and self.__y == other.__y
+          and self.__x == other.__x \
+          and self.__y == other.__y
     return NotImplemented
 
   def __neg__(self):

src/ecdsa/keys.py

@@ -142,7 +142,7 @@ def __repr__(self):
 
     def __eq__(self, other):
         """Return True if the points are identical, False otherwise."""
-        if isinstance(other, VerifyingKey):  
+        if isinstance(other, VerifyingKey):
             return self.curve == other.curve \
                 and self.pubkey == other.pubkey
         return NotImplemented
@@ -245,9 +245,9 @@ def _from_hybrid(cls, string, curve, validate_point):
         point = cls._from_raw_encoding(string[1:], curve)
 
         # but validate if it's self-consistent if we're asked to do that
-        if validate_point and \
-                (point.y() & 1 and string[:1] != b('\x07') or
-                 (not point.y() & 1) and string[:1] != b('\x06')):
+        if validate_point \
+                and (point.y() & 1 and string[:1] != b('\x07')
+                     or (not point.y() & 1) and string[:1] != b('\x06')):
             raise MalformedPointError("Inconsistent hybrid point encoding")
 
         return point
@@ -677,10 +677,10 @@ def __init__(self, _error__please_use_generate=None):
         self.baselen = None
         self.verifying_key = None
         self.privkey = None
-        
+
     def __eq__(self, other):
         """Return True if the points are identical, False otherwise."""
-        if isinstance(other, SigningKey):  
+        if isinstance(other, SigningKey):
             return self.curve == other.curve \
                 and self.verifying_key == other.verifying_key \
                 and self.privkey == other.privkey
@@ -967,8 +967,7 @@ def to_der(self, point_encoding="uncompressed"):
             der.encode_integer(1),
             der.encode_octet_string(self.to_string()),
             der.encode_constructed(0, self.curve.encoded_oid),
-            der.encode_constructed(1, der.encode_bitstring(encoded_vk, 0)),
-            )
+            der.encode_constructed(1, der.encode_bitstring(encoded_vk, 0)))
 
     def get_verifying_key(self):
         """

src/ecdsa/numbertheory.py

@@ -19,15 +19,15 @@
     xrange = range
 try:
     from gmpy2 import powmod
-    GMPY2=True
-    GMPY=False
+    GMPY2 = True
+    GMPY = False
 except ImportError:
-    GMPY2=False
+    GMPY2 = False
     try:
         from gmpy import mpz
-        GMPY=True
+        GMPY = True
     except ImportError:
-        GMPY=False
+        GMPY = False
 
 import math
 import warnings

src/ecdsa/util.py

@@ -27,7 +27,8 @@ def entropy_to_bits(ent_256):
         return ''.join(bin(ord(x))[2:].zfill(8) for x in ent_256)
 
 
-if sys.version < '2.7':  #Can't add a method to a built-in type so we are stuck with this
+if sys.version < '2.7':
+    # Can't add a method to a built-in type so we are stuck with this
     def bit_length(x):
         return len(bin(x)) - 2
 else:

tox.ini

@@ -91,5 +91,7 @@ exclude = src/ecdsa/test*.py
 # E305: expected 2 blank lines after class or function definition, found 1
 # E501: line too long
 # E502: the backslash is redundant between brackets
+# E741: ambiguous variable name
 # W391: blank line at end of file
-ignore = E111,E114,E226,E231,E266,E302,E305,E501,E502,W391
+# W503: line break before binary operator
+ignore = E111,E114,E226,E231,E266,E302,E305,E501,E502,W391,E741,W503