Python基础第10课-Python加密解密

佚名 6年前 (2019-04-08) 随笔 933人围观抢沙发百度已收录

安装加解密模块 pip3 install pycryptodome -i https://pypi.tuna.tsinghua.edu.cn/simple 库参考文档： https://pycryptodome.readthedocs.io/en/latest/ 密码学概述：对称加密Symmetric：流密码： ChaCha20 、 Salsa20、RC4…… 块密码： DES，3DES，AES…… 非对称加密： RSA,ECC…… 哈希Hash MD5，SHA1，SHA2，SHA256…… AES加密算法： https://blog.csdn.net/u011502387/article/details/77799835 AES加密模式： https://www.cnblogs.com/starwolf/p/3365834.html AES类与使用： https://pycryptodome.readthedocs.io/en/latest/src/cipher/aes.html

AES函数库：

首先要new一个AES加密（或解密）对象，传入密钥，加密模式，初始向量等

 AES.new(key, AES.MODE_CFB, iv)

然后，加密

cipher.encrypt(str)

注意点： 1.AES是块加密，加密前要pad一下，解密后要unpad一下 2.AES字节加密，Bytes串传入底层C模块，要从String转换一下附上自写的加解密模块代码

from Crypto.Cipher import AES
from Crypto.Util.Padding import pad, unpad
from Crypto.Hash import SHA256


class MyAesEncrypt:
cipher = None

#  初始化 ，传入Key，用key的sha256作AES密钥，再取密钥的前**位的哈希作初始向量
def __init__(self, key, iv=None):
key = bytes(key, encoding="UTF-8")
        key = SHA256.new(data=key).digest()
        if (iv == None):
iv = SHA256.new(data=key).digest()[:AES.block_size]
        # self.peepBytes(key, "key")
        # self.peepBytes(iv, "iv")
self.cipher = AES.new(key, AES.MODE_CFB, iv)

    #  静态方法，查看密钥
@staticmethod
def peepBytes(a, str="peepBytes"):
print(str, end=":")
        for i in a:
print("%02x" % i, end="")
        print("")

    #  加密方法
def Encrypt(self, str):
str = bytes(str, encoding="UTF-8")
        str = pad(str, AES.block_size)
        return self.cipher.encrypt(str)


class MyAesDecrypt:
uncipher = None

    def __init__(self, key, iv=None):
key = bytes(key, encoding="UTF-8")
        key = SHA256.new(data=key).digest()
        if (iv == None):
iv = SHA256.new(data=key).digest()[:AES.block_size]
        self.uncipher = AES.new(key, AES.MODE_CFB, iv)

    # 解密方法
def Decrypt(self, byte_str):
str = unpad(self.uncipher.decrypt(byte_str), AES.block_size)
        return str.decode("UTF-8")


if __name__ == "__main__":
a = MyAesEncrypt("hello")
    str = a.Encrypt("ä½ å¥½hello world")

    b = MyAesDecrypt("hello")
    print(b.Decrypt(str))