encrypt_cipher.py

#! /usr/bin/env python

##  Encryption and decryption using AES algorithm
##  with a salting function
##  two-one way functions defined - encrypt() / decrypt()


import hashlib
import random
import os
import base64

"""

def getInput():
    print "Enter message to encrypt: "
    message = raw_input()
    return message


message = getInput()
some_len = len(message)
"""

from Crypto.Cipher import AES

# key generator
public_key = os.urandom(16)

print "## Store this key ##"
print public_key

# random key generator + salt
cipher = AES.new(os.urandom(32), AES.MODE_CTR, counter=lambda: public_key)


def encrypt(message):
    """
    func to receive a message encrypt and store in a file, for reading
    """
    encryptedMessage = cipher.encrypt(message)
    return encryptedMessage


def decrypt(encryptedMessage):
    """
    func to decrypt a message and store in a file
    """
    message = cipher.decrypt(str(encryptedMessage))
    return message


x = encrypt("bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb")
print x

y = decrypt(x)
print y


"""

The ideal cryptographic hash function has four main properties:

    1. it is easy to compute the hash value for any given message
    2. it is infeasible to generate a message that has a given hash
    3. it is infeasible to modify a message without changing the hash
    4. it is infeasible to find two different messages with the same hash.

"""