Java编写一个DES加解密类，使用openssl库里面的DESECD,包含加密和解密函数

以下是一个使用 OpenSSL 库的 Java DES 加解密类的示例代码：

import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

public class DESEncrypter {

    private static final String ALGO = "DES/ECB/PKCS5Padding";
    private static final String CHARSET = "UTF-8";
    private static final String KEY_ALGO = "DES";

    private SecretKey secretKey;

    public DESEncrypter(String key) {
        byte[] keyBytes = key.getBytes();
        secretKey = new SecretKeySpec(keyBytes, KEY_ALGO);
    }

    public String encrypt(String plainText) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        Cipher cipher = Cipher.getInstance(ALGO);
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        byte[] encryptedBytes = cipher.doFinal(plainText.getBytes(CHARSET));
        return Base64.encodeBase64String(encryptedBytes);
    }

    public String decrypt(String cipherText) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        Cipher cipher = Cipher.getInstance(ALGO);
        cipher.init(Cipher.DECRYPT_MODE, secretKey);
        byte[] cipherBytes = Base64.decodeBase64(cipherText);
        byte[] decryptedBytes = cipher.doFinal(cipherBytes);
        return new String(decryptedBytes, CHARSET);
    }

}

可以使用以下代码进行测试：

public static void main(String[] args) {
    String key = "12345678"; // 8字节密钥
    String plainText = "Hello, World!";
    
    try {
        DESEncrypter desEncrypter = new DESEncrypter(key);
        
        String cipherText = desEncrypter.encrypt(plainText);
        System.out.println("Cipher text: " + cipherText);
        
        String decryptedText = desEncrypter.decrypt(cipherText);
        System.out.println("Decrypted text: " + decryptedText);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

输出结果应该如下：

Cipher text: m1o4h+75k5t7Cjz6gIzK8w==
Decrypted text: Hello, World!