python实现AES加密与解密

AES加密方式有五种：ECB, CBC, CTR, CFB, OFB

从安全性角度推荐CBC加密方法，本文介绍了CBC,ECB两种加密方法的python实现

python 在 Windows下使用AES时要安装的是pycryptodome 模块  

pip install pycryptodome

python 在 Linux下使用AES时要安装的是pycrypto模块  

pip install pycrypto

CBC加密需要一个十六位的key(密钥)和一个十六位iv(偏移量)

ECB加密不需要iv

AES CBC 加密的python实现

from Crypto.Cipher import AES
from binascii import b2a_hex, a2b_hex

# 如果text不足16位的倍数就用空格补足为16位
def add_to_16(text):
if len(text.encode('utf-8')) ％ 16:
add = 16 - (len(text.encode('utf-8')) ％ 16)
else:
add = 0
text = text + ('\0' * add)
return text.encode('utf-8')

# 加密函数
def encrypt(text):
key = '9999999999999999'.encode('utf-8')
mode = AES.MODE_CBC
iv = b'qqqqqqqqqqqqqqqq'
text = add_to_16(text)
cryptos = AES.new(key, mode, iv)
cipher_text = cryptos.encrypt(text)
# 因为AES加密后的字符串不一定是ascii字符集的，输出保存可能存在问题，所以这里转为16进制字符串
return b2a_hex(cipher_text)

# 解密后，去掉补足的空格用strip() 去掉
def decrypt(text):
key = '9999999999999999'.encode('utf-8')
iv = b'qqqqqqqqqqqqqqqq'
mode = AES.MODE_CBC
cryptos = AES.new(key, mode, iv)
plain_text = cryptos.decrypt(a2b_hex(text))
return bytes.decode(plain_text).rstrip('\0')

if __name__ == '__main__':
e = encrypt("hello world") # 加密
d = decrypt(e) # 解密
print("加密:", e)
print("解密:", d)

AES ECB加密的python实现

"""
ECB没有偏移量
"""
from Crypto.Cipher import AES
from binascii import b2a_hex, a2b_hex

def add_to_16(text):
if len(text.encode('utf-8')) ％ 16:
add = 16 - (len(text.encode('utf-8')) ％ 16)
else:
add = 0
text = text + ('\0' * add)
return text.encode('utf-8')

# 加密函数
def encrypt(text):
key = '9999999999999999'.encode('utf-8')
mode = AES.MODE_ECB
text = add_to_16(text)
cryptos = AES.new(key, mode)

cipher_text = cryptos.encrypt(text)
return b2a_hex(cipher_text)

# 解密后，去掉补足的空格用strip() 去掉
def decrypt(text):
key = '9999999999999999'.encode('utf-8')
mode = AES.MODE_ECB
cryptor = AES.new(key, mode)
plain_text = cryptor.decrypt(a2b_hex(text))
return bytes.decode(plain_text).rstrip('\0')

if __name__ == '__main__':
e = encrypt("hello world") # 加密
d = decrypt(e) # 解密
print("加密:", e)
print("解密:", d)

来源：http://www.cnblogs.com/niuu/p/10107212.html