Python 实现 AES 加密/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

示例 1

 1 from Crypto.Cipher import AES
 2 from binascii import b2a_hex, a2b_hex
 3 
 4 
 5 # 如果text不足16位的倍数就用空格补足为16位
 6 def add_to_16(text):
 7     if len(text.encode('utf-8')) % 16:
 8         add = 16 - (len(text.encode('utf-8')) % 16)
 9     else:
10         add = 0
11     text = text + ('' * add)
12     return text.encode('utf-8')
13 
14 
15 # 加密函数
16 def encrypt(text):
17     key = '9999999999999999'.encode('utf-8')
18     mode = AES.MODE_CBC
19     iv = b'qqqqqqqqqqqqqqqq'
20     text = add_to_16(text)
21     cryptos = AES.new(key, mode, iv)
22     cipher_text = cryptos.encrypt(text)
23     # 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
24     return b2a_hex(cipher_text)
25 
26 
27 # 解密后，去掉补足的空格用strip() 去掉
28 def decrypt(text):
29     key = '9999999999999999'.encode('utf-8')
30     iv = b'qqqqqqqqqqqqqqqq'
31     mode = AES.MODE_CBC
32     cryptos = AES.new(key, mode, iv)
33     plain_text = cryptos.decrypt(a2b_hex(text))
34     return bytes.decode(plain_text).rstrip('')
35 
36 
37 if __name__ == '__main__':
38     e = encrypt("hello world")  # 加密
39     d = decrypt(e)  # 解密
40     print("加密:", e)
41     print("解密:", d)

 示例 2 

import base64
from Crypto.Cipher import AES
from Crypto.Util.Padding import pad, unpad

# try:
#     from Crypto.Cipher import AES
#     from Crypto.Util.Padding import pad, unpad
# except ImportError:
#     print('在Windows下使用AES时要安装的是 试试pycryptodome 模块,'
#           '在Linux下使用AES时要安装的是pycrypto模块')


class AesSample(object):
    def __init__(self):
        self.key = '*****************'.encode('utf-8')
        self.iv = self.key[0:16]
        self.mode = AES.MODE_CBC

    def encode(self, data):
        """
        AES 加密算法，模式pkcs7
        """
        cipher = AES.new(self.key, self.mode, self.iv)
        pad_pkcs7 = pad(data.encode('utf-8'), AES.block_size, style='pkcs7')
        result = base64.encodebytes(cipher.encrypt(pad_pkcs7))
        encrypted_text = str(result, encoding='utf-8').replace('
', '')
        return encrypted_text

    def decode(self, data):
        """
        AES 解密算法，模式pkcs7
        """
        cipher = AES.new(self.key, self.mode, self.iv)
        base64_decrypted = base64.decodebytes(data.encode('utf-8'))
        una_pkcs7 = unpad(cipher.decrypt(base64_decrypted), AES.block_size, style='pkcs7')
        decrypted_text = str(una_pkcs7, encoding='utf-8')
        return decrypted_text.strip('"')

#     def test(self):
#         data1 = 'hello world!'
#         data2 = '6tmL9dZljaEJUctTaJIU8g=='
#         print('加密结果：', self.encode(data1))
#         print('解密结果：', self.decode(data2))
#
#
# if __name__ == '__main__':
#     blog = AesSample()
#     blog.test()

AES ECB加密的python实现

 1 """
 2 ECB没有偏移量
 3 """
 4 from Crypto.Cipher import AES
 5 from binascii import b2a_hex, a2b_hex
 6 
 7 
 8 def add_to_16(text):
 9     if len(text.encode('utf-8')) % 16:
10         add = 16 - (len(text.encode('utf-8')) % 16)
11     else:
12         add = 0
13     text = text + ('' * add)
14     return text.encode('utf-8')
15 
16 
17 # 加密函数
18 def encrypt(text):
19     key = '9999999999999999'.encode('utf-8')
20     mode = AES.MODE_ECB
21     text = add_to_16(text)
22     cryptos = AES.new(key, mode)
23 
24     cipher_text = cryptos.encrypt(text)
25     return b2a_hex(cipher_text)
26 
27 
28 # 解密后，去掉补足的空格用strip() 去掉
29 def decrypt(text):
30     key = '9999999999999999'.encode('utf-8')
31     mode = AES.MODE_ECB
32     cryptor = AES.new(key, mode)
33     plain_text = cryptor.decrypt(a2b_hex(text))
34     return bytes.decode(plain_text).rstrip('')
35 
36 
37 if __name__ == '__main__':
38     e = encrypt("hello world")  # 加密
39     d = decrypt(e)  # 解密
40     print("加密:", e)
41     print("解密:", d)