python实现加密

1、md5加密

hashlib 库中包括如SHA1、SHA224、SHA256、SHA384、SHA512和MD5算法等

>>> import hashlib
>>> hashlib.md5('123'.encode('utf-8')).hexdigest()
'202cb962ac59075b964b07152d234b70'

　　

2、base64

import base64

str = 'hello world'.encode(encoding='utf-8')

#加密
encodestr = base64.b64encode(str)
print(encodestr) #b'aGVsbG8gd29ybGQ='
print(encodestr.decode())  #aGVsbG8gd29ybGQ=

#解密

decodestr = base64.b64decode(encodestr)
print(decodestr)  #b'hello world'
print(decodestr.decode())  #hello world

　　

3、AES

#AES-demo

import base64
from Crypto.Cipher import AES

'''
采用AES对称加密算法
'''
# str不是16的倍数那就补足为16的倍数
def add_to_16(value):
    while len(value) % 16 != 0:
        value += '\0'
    return str.encode(value)  # 返回bytes
#加密方法
def encrypt_oracle():
    # 秘钥
    key = ''
    # 待加密文本
    text = 'abc123def456'
    # 初始化加密器
    aes = AES.new(add_to_16(key), AES.MODE_ECB)
    #先进行aes加密
    encrypt_aes = aes.encrypt(add_to_16(text))
    #用base64转成字符串形式
    encrypted_text = str(base64.encodebytes(encrypt_aes), encoding='utf-8')  # 执行加密并转码返回bytes
    print(encrypted_text)
#解密方法
def decrypt_oralce():
    # 秘钥
    key = ''
    # 密文
    text = 'qR/TQk4INsWeXdMSbCDDdA=='
    # 初始化加密器
    aes = AES.new(add_to_16(key), AES.MODE_ECB)
    #优先逆向解密base64成bytes
    base64_decrypted = base64.decodebytes(text.encode(encoding='utf-8'))
    #
    decrypted_text = str(aes.decrypt(base64_decrypted),encoding='utf-8') # 执行解密密并转码返回str
    print(decrypted_text)

if __name__ == '__main__':
   # encrypt_oracle()
    decrypt_oralce()

4、RSA

pip install rsa  //安装rsa模块

 import rsa
 key = rsa.newkeys(3000)#生成随机秘钥
 privateKey = key[1]#私钥
 publicKey = key[0]#公钥
 message ='sanxi Now is better than never.'
 print('Before encrypted:',message)
 message = message.encode()
 cryptedMessage = rsa.encrypt(message, publicKey)
 print('After encrypted:\n',cryptedMessage)
 message = rsa.decrypt(cryptedMessage, privateKey)
 message = message.decode()
 print('After decrypted:',message)