Java实现DES编码加解密 - 密钥为: Hex

编写工具类

public class DesPasswordUtil {

    public static final String WIFI_DES_KEY = "TmuhP9PDtcQ=";

    /**
     * 生成密钥
     *
     * @return {@link String }
     * @throws Exception 例外
     */
    public static String generateKey() throws Exception {
        KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");
        keyGenerator.init(56); // DES密钥长度为56位
        SecretKey secretKey = keyGenerator.generateKey();
        byte[] keyBytes = secretKey.getEncoded();
        // 截取前8字节
        byte[] truncatedKeyBytes = new byte[8];
        System.arraycopy(keyBytes, 0, truncatedKeyBytes, 0, 8);
        return Base64.getEncoder().encodeToString(truncatedKeyBytes);
    }

    /**
     * 加密
     *
     * @param data 数据
     * @param key  钥匙
     * @return {@link String }
     * @throws Exception 例外
     */
    public static String encrypt(String data, String key) throws Exception {
        byte[] keyBytes = Base64.getDecoder().decode(key);
        // 确保密钥长度为8字节
        if (keyBytes.length != 8) {
            throw new IllegalArgumentException("密钥长度必须为8字节");
        }
        SecretKey secretKey = new SecretKeySpec(keyBytes, "DES");
        Cipher cipher = Cipher.getInstance("DES");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        byte[] encryptedBytes = cipher.doFinal(data.getBytes("UTF-8"));
        return Base64.getEncoder().encodeToString(encryptedBytes);
    }

    /**
     * 解密
     *
     * @param encryptedData 加密数据
     * @param key           钥匙
     * @return {@link String }
     * @throws Exception 例外
     */
    public static String decrypt(String encryptedData, String key) throws Exception {
        byte[] encryptedBytes = Base64.getDecoder().decode(encryptedData);
        byte[] keyBytes = Base64.getDecoder().decode(key);
        // 确保密钥长度为8字节
        if (keyBytes.length != 8) {
            throw new IllegalArgumentException("密钥长度必须为8字节");
        }
        SecretKey secretKey = new SecretKeySpec(keyBytes, "DES");
        Cipher cipher = Cipher.getInstance("DES");
        cipher.init(Cipher.DECRYPT_MODE, secretKey);
        byte[] decryptedBytes = cipher.doFinal(encryptedBytes);
        return new String(decryptedBytes, "UTF-8");
    }
}

测试用例

public static void main(String[] args) {
        try {
            String key = "H1eP+wGDMW0=";

            System.out.println("生成的密钥：" + key);

            String data = "123456";
            String encryptedData = DesPasswordUtil.encrypt(data, key);
            System.out.println("加密后的数据：" + encryptedData);

            String decryptedData = DesPasswordUtil.decrypt(encryptedData, key);
            System.out.println("解密后的数据：" + decryptedData);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

输出结果

生成的密钥：H1eP+wGDMW0=
加密后的数据：hrKE2n/Pj0E=
解密后的数据：123456