Python AES 加密 pycrypto‎

安装

有多种方式：

1. Windows 下 exe 文件，下载地址，如果有报错，可以下载 VCForPython27
2. pip install pycrypto，可能会报错 microsoft visual c++ 14.0 is required，查看 https://wiki.python.org/moin/WindowsCompilers ，需要下载 Visual Studio，最后采用了第三种方法。
3. pip install pycrypto‎dome，GitHub ：https://github.com/Legrandin/pycryptodome

使用

python 2.7

参考 https://stackoverflow.com/questions/12524994/encrypt-decrypt-using-pycrypto-aes-256/12525165#12525165

# -*- coding: utf-8 -*
import time
from binascii import b2a_hex, a2b_hex
from Crypto.Cipher import AES

BS = AES.block_size
# 加密算法
pad = lambda s: s + (BS - len(s) % BS) * chr(BS - len(s) % BS)
# 解密算法
unpad = lambda s: s[:-ord(s[len(s) - 1:])]

class AESCipher:
    def __init__(self, key):
        self.key = key
        self.iv = b'0102030405060708'

    # 加密
    def encrypt(self, raw):
        raw = pad(raw)
        cipher = AES.new(self.key, AES.MODE_CBC, self.iv)
        return b2a_hex(cipher.encrypt(raw))

    # 解密
    def decrypt(self, enc):
        cipher = AES.new(self.key, AES.MODE_CBC, self.iv)
        return unpad(cipher.decrypt(a2b_hex(enc)))

timeStamp = str(int(time.time()))
key = b'AD0001' + timeStamp
aa = AESCipher(key)
s = aa.encrypt('123456')
print("加密：" + s)
ss = aa.decrypt(s)
print("解密：" + ss)

python 3.6

# -*- coding: utf-8 -*
import time
from binascii import b2a_hex, a2b_hex
from Crypto.Cipher import AES

BS = AES.block_size
# 加密算法
pad = lambda s: s + (BS - len(s) % BS) * chr(BS - len(s) % BS)
# 解密算法
unpad = lambda s: s[:-ord(s[len(s) - 1:])]

class AESCipher:
    def __init__(self, key):
        self.key = key
        self.iv = b'0102030405060708'

    # 加密
    def encrypt(self, raw):
        raw = pad(raw).encode("utf-8") # 1
        cipher = AES.new(self.key, AES.MODE_CBC, self.iv)
        return b2a_hex(cipher.encrypt(raw))

    # 解密
    def decrypt(self, enc):
        cipher = AES.new(self.key, AES.MODE_CBC, self.iv)
        return unpad(cipher.decrypt(a2b_hex(enc)))

timeStamp = str(int(time.time()))
key = bytes("AD0001"+timeStamp,'utf-8') # 2
aa = AESCipher(key)
s = aa.encrypt('123456')
print("加密：" + str(s, encoding="utf-8")) # 3
ss = aa.decrypt(s)
print("解密：" + str(ss, encoding="utf-8")) # 4

由 python 2.7 版本修改至 python 3.6 版本。

• 注释 1，如果不修改会报错 TypeError: Object type <class 'str'> cannot be passed to C code，感谢 https://stackoverflow.com/questions/46052752/using-aes-encrypt-get-raise-typeerroronly-byte-strings-can-be-passed-to-c-code
• 注释 2，报错同注释 1，key 的类型需要是 bytes。
• 注释 3，4，如果不修改会报错 TypeError: must be str, not bytes，类型转换下即可。