python实现des加密算法

时间: 2023-11-28 15:46:21 浏览: 75

python之des加密算法

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根据提供的文件信息，本文将重点介绍Python中的DES加密算法，并简要提及MD5加密算法。同时，文中还将涉及Python中的图形界面编程库Tkinter的基本用法。以下是对这些知识点的详细解析。 ### 一、Python中的DES加密算法 **DES（Data Encryption Standard）**是一种对称加密算法，它使用一个56位的密钥来加密和解密数据。在对称加密算法中，加密和解密都使用相同的密钥。DES算法虽然现在已经被AES等更安全的算法所取代，但在了解加密技术的发展历程上仍然具有重要意义。在Python中实现DES加密主要依赖于第三方库`pycryptodome`。下面是一个简单的Python代码示例，展示如何使用`pycryptodome`库进行DES加密和解密： ```python from Crypto.Cipher import DES from Crypto.Random import get_random_bytes def pad(s): return s + (8 - len(s) % 8) * chr(8 - len(s) % 8) def unpad(s): return s[:-ord(s[len(s)-1:])] def encrypt(message, key): cipher = DES.new(key, DES.MODE_ECB) padded_message = pad(message) ciphertext = cipher.encrypt(padded_message.encode()) return ciphertext def decrypt(ciphertext, key): cipher = DES.new(key, DES.MODE_ECB) plaintext = cipher.decrypt(ciphertext) unpadded_message = unpad(plaintext.decode()) return unpadded_message key = get_random_bytes(8) message = "Hello, DES!" ciphertext = encrypt(message, key) decrypted_message = decrypt(ciphertext, key) print("Original Message:", message) print("Encrypted Message:", ciphertext) print("Decrypted Message:", decrypted_message) ``` ### 二、Python中的MD5加密算法 **MD5（Message-Digest Algorithm 5）**是一种散列函数，用于生成一个固定长度（通常是128位）的散列值或摘要。虽然MD5不再推荐用于安全性要求高的场景，但其在某些应用场景下仍有一定的价值，比如用于文件完整性校验。在Python中，可以使用内置模块`hashlib`来实现MD5加密： ```python import hashlib def md5_hash(message): hash_object = hashlib.md5() hash_object.update(message.encode('utf-8')) return hash_object.hexdigest() message = "Hello, MD5!" hashed_message = md5_hash(message) print("Original Message:", message) print("Hashed Message:", hashed_message) ``` ### 三、Python中的图形界面编程库Tkinter 除了加密算法外，提供的部分代码还涉及了Python的图形界面编程库Tkinter。Tkinter是Python的一个标准GUI库，提供了创建窗口应用程序所需的基本工具集。以下是Tkinter的一些基本用法示例： #### 1. 使用`pack`布局管理器创建简单窗口 ```python from tkinter import * root = Tk() Label(root, text='Hello, Tkinter!').pack() root.mainloop() ``` #### 2. 设置窗口大小并使用`pack`布局管理器 ```python from tkinter import * root = Tk() root.geometry('200x100') Label(root, text='Hello, Tkinter!').pack() root.mainloop() ``` #### 3. 使用`pack`布局管理器添加多个组件 ```python from tkinter import * root = Tk() root.geometry('200x100') for i in range(5): Label(root, text=f'Label {i}').pack() root.mainloop() ``` #### 4. 使用`fill`选项控制组件填充方式 ```python from tkinter import * root = Tk() root.geometry('200x100') Label(root, text='Top Label', bg='red').pack(fill=BOTH) Label(root, text='Middle Label', bg='blue').pack(fill=BOTH) Label(root, text='Bottom Label', bg='green').pack(fill=BOTH) root.mainloop() ``` 通过以上示例，我们可以看到Python在加密算法以及图形界面编程方面的强大功能。无论是加密算法的应用还是图形界面的设计，Python都提供了丰富的工具和支持，使得开发者能够快速高效地完成任务。

以下是Python实现DES加密算法的示例代码： ```python from typing import List # 初始置换表IP IP_TABLE = [58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4, 62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8, 57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3, 61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7] # 逆初始置换表IP^-1 IP_INV_TABLE = [40, 8, 48, 16, 56, 24, 64, 32, 39, 7, 47, 15, 55, 23, 63, 31, 38, 6, 46, 14, 54, 22, 62, 30, 37, 5, 45, 13, 53, 21, 61, 29, 36, 4, 44, 12, 52, 20, 60, 28, 35, 3, 43, 11, 51, 19, 59, 27, 34, 2, 42, 10, 50, 18, 58, 26, 33, 1, 41, 9, 49, 17, 57, 25] # 扩展置换表E E_TABLE = [32, 1, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9, 8, 9, 10, 11, 12, 13, 12, 13, 14, 15, 16, 17, 16, 17, 18, 19, 20, 21, 20, 21, 22, 23, 24, 25, 24, 25, 26, 27, 28, 29, 28, 29, 30, 31, 32, 1] # 置换函数P P_TABLE = [16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10, 2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25] # S盒 S_BOX = [ # S1 [ [14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7], [0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8], [4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0], [15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13] ], # S2 [ [15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10], [3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5], [0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15], [13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9] ], # S3 [ [10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8], [13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1], [13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7], [1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12] ], # S4 [ [7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15], [13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9], [10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4], [3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14] ], # S5 [ [2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9], [14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6], [4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14], [11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3] ], # S6 [ [12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11], [10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8], [9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6], [4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13] ], # S7 [ [4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1], [13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6], [1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2], [6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12] ], # S8 [ [13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7], [1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2], [7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8], [2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11] ] ] # 置换选择1 PC1_TABLE = [57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36, 63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4] # 置换选择2 PC2_TABLE = [14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10, 23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2, 41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48, 44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32] # 左移位数表 SHIFT_TABLE = [1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2,

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python实现des加密算法

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