Python 的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
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 + ('\0' * 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('\0') 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)
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 + ('\0' * 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('\0') 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)
