DES加密算法java实现代码

以下是一个简单的DES加密算法的Java实现代码：

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class DES {
    private static final String ALGORITHM = "DES";

    public static byte[] encrypt(byte[] input, byte[] key) throws Exception {
        SecretKey secretKey = new SecretKeySpec(key, ALGORITHM);
        Cipher cipher = Cipher.getInstance(ALGORITHM);
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        return cipher.doFinal(input);
    }

    public static byte[] decrypt(byte[] input, byte[] key) throws Exception {
        SecretKey secretKey = new SecretKeySpec(key, ALGORITHM);
        Cipher cipher = Cipher.getInstance(ALGORITHM);
        cipher.init(Cipher.DECRYPT_MODE, secretKey);
        return cipher.doFinal(input);
    }

    public static byte[] generateKey() throws Exception {
        KeyGenerator keyGenerator = KeyGenerator.getInstance(ALGORITHM);
        keyGenerator.init(56);
        SecretKey secretKey = keyGenerator.generateKey();
        return secretKey.getEncoded();
    }
}

这个代码可以用来加密和解密数据，同时也可以生成一个随机的DES密钥。