DES加密解密编程代码python

DES (Data Encryption Standard) 是一种对称加密算法，用于数据的加密和解密。在Python中，我们可以使用`cryptography`库来进行DES操作，这是一个流行的密码学库。下面是一个简单的例子，展示如何使用`cryptography`进行DES加解密：

from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC

# 导入需要的密钥函数
def get_des_key(password):
    salt = b'some_salt'  # 这里通常会从安全来源获取盐
    kdf = PBKDF2HMAC(algorithm=algorithms.HMAC(algorithm=algorithms.SHA256(), backend=default_backend()),
                    length=16, salt=salt, iterations=100000)
    key = kdf.derive(password.encode('utf-8'))
    return key

# 加密函数
def encrypt(plaintext, key):
    cipher = Cipher(algorithms.DES(key), modes.ECB(), backend=default_backend())
    encryptor = cipher.encryptor()
    ciphertext = encryptor.update(plaintext.encode('utf-8')) + encryptor.finalize()
    return ciphertext

# 解密函数
def decrypt(ciphertext, key):
    cipher = Cipher(algorithms.DES(key), modes.ECB(), backend=default_backend())
    decryptor = cipher.decryptor()
    plaintext = decryptor.update(ciphertext) + decryptor.finalize()
    return plaintext.decode('utf-8')

# 示例用法
password = "your_password"
key = get_des_key(password)
plaintext = "Hello, DES!"
ciphertext = encrypt(plaintext, key)
print("Encrypted:", ciphertext)
decrypted_text = decrypt(ciphertext, key)
print("Decrypted:", decrypted_text)