使用PyCrypto做AES加密详解编程语言

#!/usr/bin/env python 
 
from Crypto.Cipher import AES 
import base64 
import os 
 
# the block size for the cipher object; must be 16, 24, or 32 for AES 
BLOCK_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_SIZE 
PADDING = '{' 
 
# one-liner to sufficiently pad the text to be encrypted 
pad = 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 base64 
EncodeAES = lambda c, s: base64.b64encode(c.encrypt(pad(s))) 
DecodeAES = lambda c, e: c.decrypt(base64.b64decode(e)).rstrip(PADDING) 
 
# generate a random secret key 
secret = os.urandom(BLOCK_SIZE) 
 
# create a cipher object using the random secret 
cipher = AES.new(secret) 
 
# encode a string 
encoded = EncodeAES(cipher, 'password') 
print 'Encrypted string:', encoded 
 
# decode the encoded string 
decoded = DecodeAES(cipher, encoded) 
print 'Decrypted string:', decoded