python实现AES加密与解密

Python  /  管理员 发布于 7年前   161

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 AESfrom 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 AESfrom binascii import b2a_hex, a2b_hexdef 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)

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