pycrypto实现AES加密和解密

一 代码

# -*- coding: UTF-8 -*-import stringimport randomfrom Crypto.Cipher import AESdef keyGenerater(length):    '''生成指定长度的秘钥'''    if length not in (16, 24, 32):        return None    x = string.ascii_letters+string.digits    return ''.join([random.choice(x) for i in range(length)]) def encryptor_decryptor(key, mode):    return AES.new(key, mode, b'0000000000000000')#使用指定密钥和模式对给定信息进行加密def AESencrypt(key, mode, text):    encryptor = encryptor_decryptor(key, mode)    return encryptor.encrypt(text)#使用指定密钥和模式对给定信息进行解密def AESdecrypt(key, mode, text):    decryptor = encryptor_decryptor(key, mode)    return decryptor.decrypt(text)if __name__ == '__main__':    text = 'Python3.5 is excellent.'    key = keyGenerater(16)    #随机选择AES的模式    mode = random.choice((AES.MODE_CBC, AES.MODE_CFB, AES.MODE_ECB, AES.MODE_OFB))    if not key:        print('Something is wrong.')    else:        print('key:', key)        print('mode:', mode)        print('Before encryption:', text)        #明文必须以字节串形式，且长度为16的倍数        text_encoded = text.encode()        text_length = len(text_encoded)        padding_length = 16 - text_length%16        text_encoded = text_encoded + b'0'*padding_length                text_encrypted = AESencrypt(key, mode, text_encoded)        print('After encryption:', text_encrypted)        text_decrypted =AESdecrypt(key, mode, text_encrypted)        print('After decryption:', text_decrypted.decode()[:-padding_length])

 

二 运行结果

E:\python\python可以这样学\第18章 密码学编程\code>python AES_test.py

('key:', 'D5pcO6iu0HIbj3I2')

('mode:', 1)

('Before encryption:', 'Python3.5 is excellent.')

('After encryption:', '\xf4\x15\x9f\xaf\xea\xd0\n\x03\xfdf\xf6}9\xaa\xa34\xb4\x1eL2\x0e \x16\xa5 \xff?\x8bA\x8e\xdd\xa8')

('After decryption:', u'Python3.5 is excellent.')