python AES 加密

pad: ZeroPadding

mode: cbc

 

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# 这里使用pycrypto‎库
# 按照方法:easy_install pycrypto‎

from Crypto.Cipher import AES
import base64

class prpcrypt():

def __init__(self, key, iv):
self.key = key
self.mode = AES.MODE_CBC
self.iv = iv

# 加密函数，如果text不足16位就用空格补足为16位，
# 如果大于16当时不是16的倍数，那就补足为16的倍数。
def encrypt(self, text):
cryptor = AES.new('123454536f667445454d537973576562',
self.mode, IV=self.iv)
# 这里密钥key 长度必须为16（AES-128）,
# 24（AES-192）,或者32 （AES-256）Bytes 长度
# 目前AES-128 足够目前使用
length = 16
count = len(text)
if count < length:
add = (length - count)
#\0 backspace
text = text + ('\0' * add)
elif count > length:
add = (length - (count % length))
text = text + ('\0' * add)
self.ciphertext = cryptor.encrypt(text)
# 因为AES加密时候得到的字符串不一定是ascii字符集的，输出到终端或者保存时候可能存在问题
# 所以这里统一把加密后的字符串转化为16进制字符串
return base64.b64encode(self.ciphertext)

# 解密后，去掉补足的空格用strip() 去掉
def decrypt(self, text):
cryptor = AES.new(self.key, self.mode, IV=self.iv)
plain_text = cryptor.decrypt(base64.b64decode(text))
return plain_text.rstrip('\0')

if __name__ == '__main__':
pc = prpcrypt('123454536f667445454d537973576562',
'1234577290ABCDEF1264147890ACAE45'[0:16]) # 初始化密钥

e = pc.encrypt('T10515') # 加密
print "加密:", e

d = pc.decrypt(e) # 解密
print "解密:", d

 

AES:

pad pkcs7

mode cbc

# -*- coding: utf-8 -*-
from Crypto.Cipher import AES
import base64
import os

BS = AES.block_size
pad = lambda s: s + (BS - len(s) % BS) * chr(BS - len(s) % BS)
unpad = lambda s: s[0:-ord(s[-1])]

key = os.urandom(16) # the length can be (16, 24, 32)
text = '123456'

cipher = AES.new(key)
cipher = AES.new('33b21adee1b8620a7ba81aea1a80c724',
AES.MODE_CBC, IV='1234567812345678')

encrypted = cipher.encrypt(pad(text))
encrypted = base64.b64encode(encrypted)
print encrypted # will be something like 'f456a6b0e54e35f2711a9fa078a76d16'