Tutorial on various cryptographic modules for python cryptography

In this chapter, you will learn more about the various cryptographic modules in Python.

cryptographic module

It contains all recipes and primitives and provides an advanced coding interface in Python. You can install the encryption module using the following command :

 pip install cryptography

coding

You can implement the encryption module using the following code :

from  import Fernet
key = Fernet.generate_key()
cipher_suite = Fernet(key)
cipher_text = cipher_suite.encrypt("This example is used to demonstrate cryptography module")
plain_text = cipher_suite.decrypt(cipher_text)

exports

The code given above produces the following output :.

The code given here is used to validate the password and create its hash value.

It also includes logic for verifying passwords for authentication purposes.

import uuid
import hashlib
def hash_password(password):
   # uuid is used to generate a random number of the specified password
   salt = uuid.uuid4().hex
   return hashlib.sha256(() + ()).hexdigest() + ':' + salt
def check_password(hashed_password, user_password):
   password, salt = hashed_password.split(':')
   return password == hashlib.sha256(() + user_password.encode()).hexdigest()
new_pass = input('Please enter a password: ')
hashed_password = hash_password(new_pass)
print('The string to store in the db is: ' + hashed_password)
old_pass = input('Now please enter the password again to check: ')
if check_password(hashed_password, old_pass):
   print('You entered the right password')
else:
   print('Passwords do not match')

exports

Scenario 1 : If you have entered the correct password, you can find the following outputs :

Scenario 2 : If we enter the wrong password, you can find the following outputs :

clarification

The Hashlib package is used to store passwords in a database. In this program, salt is used to add a random sequence to the password string before implementing the hash function.

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