old_contents: 
  from hashlib import sha512 # crypto-secure hashing algorithm
  from pbkdf2 import PBKDF2 # key-stretching algorithm
  from os import urandom # crypto-secure random number gen
  
  ITERATIONS = 5000
  SALT_LEN = 32
  KEY_LEN = 64
  class Password:
      def __init__(self, password):
          self.salt = urandom(SALT_LEN) # 256-bit salt
          self.key = PBKDF2(
                  passphrase=password,
                  salt=self.salt,
                  iterations=ITERATIONS,
                  digestmodule=sha512
                  ).read(KEY_LEN)
          
  
      def get_hash(self):
          return self.key
      
      def get_salt(self):
          return self.salt
  
      @staticmethod
      def check_pass(password, key, thesalt):
          return PBKDF2(
                  passphrase=password,
                  salt=thesalt,
                  iterations=ITERATIONS,
                  digestmodule=sha512
                  ).read(KEY_LEN) \
                  == \
                  key
  
  
  
  
new_contents: 
  from hashlib import sha512 # crypto-secure hashing algorithm
  from pbkdf2 import PBKDF2 # key-stretching algorithm
  from os import urandom # crypto-secure random number gen
  
  ITERATIONS = 5000
  SALT_LEN = 32 # 256-bit salt
  KEY_LEN = 64 # 512-bit key
  class Password:
      def __init__(self, password):
          self.salt = urandom(SALT_LEN) 
          self.key = PBKDF2(
                  passphrase=password,
                  salt=self.salt,
                  iterations=ITERATIONS,
                  digestmodule=sha512
                  ).read(KEY_LEN)
          
  
      def get_hash(self):
          return self.key
      
      def get_salt(self):
          return self.salt
  
      @staticmethod
      def check_pass(password, key, thesalt):
          return PBKDF2(
                  passphrase=password,
                  salt=thesalt,
                  iterations=ITERATIONS,
                  digestmodule=sha512
                  ).read(KEY_LEN) \
                  == \
                  key
  
  
  
  
subject: Add comments to secure_pass