python AES对称加密示例

本是古典何须时尚 2022-09-29 05:28 177阅读 0赞

**基本概念：**

高级加密标准（英语：Advanced Encryption Standard，缩写：AES）

**注意点：**

1.字符集处理

2.秘钥的生成，建议按照某种规则产生，比如对用户id进行一定规则加工后，进行md5计算，再从中取出16个字节，这样每条数据的加密秘钥不一样，防止被碰撞

3.秘钥的长度，key可以是16/24/32 位长度， 其对应为 AES-128，AES-196 和 AES-256

4.测试源码的加密方式仅限于在服务器加解密，比如存到数据库前进行加密，防脱裤

**测试源码：**

#!/usr/bin/env python
    #coding=utf8
    
    from Crypto.Cipher import AES
    from Crypto import Random
    
    # AES根据16位对齐
    BS = 16
    
    # 转成utf8编码
    def unicode_to_utf8(s):
        if isinstance(s, unicode):
            s = s.encode("utf-8")
        return s
    
    
    # 补充字符,最少1个
    def pad(s):
        length = len(s)
        add = BS - length % BS
        byte = chr(BS - length % BS)
        return s + (add * byte)
    
    
    # 去除补充字符
    def unpad(s):
        length = len(s)
        byte = s[length-1:]
        add = ord(byte)
        return s[:-add]
    
    
    # class
    class AESCipher:
        #初始化
        def __init__(self, key):
            self.key = key
    
        #加密
        def encrypt(self, raw):
            raw = unicode_to_utf8(raw)
            raw = pad(raw)
            cipher = AES.new(self.key, AES.MODE_CBC, self.key)
            return cipher.encrypt(raw)
    
        #解密
        def decrypt(self, enc):
            cipher = AES.new(self.key, AES.MODE_CBC, self.key)
            return unpad(cipher.decrypt(enc))
    
    
    if __name__ == '__main__':
        
        #注意key是16字节长
        key = "f2c85e0140a47415"
        
        #初始化
        aes = AESCipher(key)
    
        s1 = "hello world"
        s2 = "带鱼拯救世界"
        s3 = "~!@#$%^&"
        s4 = u"~！@#￥%……&带鱼拯救world"
    
        en1 = aes.encrypt(s1)
        de1 = aes.decrypt(en1)
    
        en2 = aes.encrypt(s2)
        de2 = aes.decrypt(en2)
    
        en3 = aes.encrypt(s3)
        de3 = aes.decrypt(en3)
    
        en4 = aes.encrypt(s4)
        de4 = aes.decrypt(en4)
    
        print 's1:', de1
        print 's2:', de2
        print 's3:', de3
        print 's4:', de4

原文出自：[http://blog.csdn.net/daiyudong2020/article/details/62088583][http_blog.csdn.net_daiyudong2020_article_details_62088583]

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[http_blog.csdn.net_daiyudong2020_article_details_62088583]: http://blog.csdn.net/daiyudong2020/article/details/62088583