fix: extra whitespace and other linting issues

Author: lapets

src/blindfold/blindfold.py

@@ -267,7 +267,7 @@ def __init__(self: Cluster, cluster: dict):
 
         if len(cluster['nodes']) < 1:
             raise ValueError('cluster configuration must contain at least one node')
-        
+
         self.update(cluster)
 
 class Operations(dict):
@@ -817,7 +817,7 @@ def generate( # pylint: disable=arguments-differ # Seeds not supported.
             )
 
         _validate_key_attributes(cluster, operations, threshold)
-        
+
         cluster_key = _Key({'cluster': cluster, 'operations': operations})
         cluster_key.__class__ = ClusterKey # Constructor disabled to mirror TypeScript.
         if threshold is not None:
@@ -934,9 +934,9 @@ def generate(secret_key: SecretKey) -> PublicKey:
           ...
         TypeError: secret key expected
         """
-        # No internal validation of the supplied secret key is performed 
-        # beyond what is necessary for the generation of this public key. 
-        # It is also assumed that the encapsulated key from the Paillier 
+        # No internal validation of the supplied secret key is performed
+        # beyond what is necessary for the generation of this public key.
+        # It is also assumed that the encapsulated key from the Paillier
         # cryptosystem library has valid internal structure.
 
         if not isinstance(secret_key, SecretKey):
@@ -960,7 +960,6 @@ def dump(self: PublicKey) -> dict:
         instance. This method complements the :obj:`load` method.
         """
         return {
-            'material': {},
             'cluster': self['cluster'],
             'operations': self['operations'],
 
@@ -1262,7 +1261,10 @@ def encrypt(
             # divided by four to determine the length of its hex representation.
             # The ciphertext is then padded to always have the same length (in case
             # the underlying integer happens to have a shorter representation).
-            return ciphertext.zfill((SecretKey._paillier_prime_bit_length * 4) // 4)
+            return ciphertext.zfill(
+                # pylint: disable=protected-access
+                (SecretKey._paillier_prime_bit_length * 4) // 4
+            )
 
         # For multiple-node clusters and no threshold, additive secret sharing is used.
         if 'threshold' not in key: