Python uses PyCrypto to implement the AES encryption function example, pycryptoaes

Python uses PyCrypto to implement the AES encryption function example, pycryptoaes

This example describes how Python uses PyCrypto to implement AES encryption. We will share this with you for your reference. The details are as follows:

#!/usr/bin/env pythonfrom Crypto.Cipher import AESimport base64import os# the block size for the cipher object; must be 16, 24, or 32 for AESBLOCK_SIZE = 32# the character used for padding--with a block cipher such as AES, the value# you encrypt must be a multiple of BLOCK_SIZE in length. This character is# used to ensure that your value is always a multiple of BLOCK_SIZEPADDING = '{'# one-liner to sufficiently pad the text to be encryptedpad = lambda s: s + (BLOCK_SIZE - len(s) % BLOCK_SIZE) * PADDING# one-liners to encrypt/encode and decrypt/decode a string# encrypt with AES, encode with base64EncodeAES = lambda c, s: base64.b64encode(c.encrypt(pad(s)))DecodeAES = lambda c, e: c.decrypt(base64.b64decode(e)).rstrip(PADDING)# generate a random secret keysecret = os.urandom(BLOCK_SIZE)# create a cipher object using the random secretcipher = AES.new(secret)# encode a stringencoded = EncodeAES(cipher, 'password')print 'Encrypted string:', encoded# decode the encoded stringdecoded = DecodeAES(cipher, encoded)print 'Decrypted string:', decoded

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