Java实现DES编码加解密 - 密钥为: Text

编写工具类

public class DesPasswordUtil {

    public static final String WIFI_DES_KEY = "TmuhP9PD";

    /**
     * 生成密钥
     *
     * @return {@link String }
     * @throws Exception 例外
     */
    public static SecretKeySpec createKeyFromText(String keyStr) throws Exception {
        if (keyStr.length() != 8) {
            throw new IllegalArgumentException("密钥长度必须为8个字符");
        }
        byte[] keyBytes = new byte[8];
        for (int i = 0; i < 8; i++) {
            keyBytes[i] = (byte) keyStr.charAt(i);
        }
        return new SecretKeySpec(keyBytes, "DES");
    }

    /**
     * 加密
     *
     * @param data 数据
     * @param key  钥匙
     * @return {@link String }
     * @throws Exception 例外
     */
    public static String encrypt(String data, SecretKeySpec key) throws Exception {
        Cipher cipher = Cipher.getInstance("DES");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        byte[] encryptedBytes = cipher.doFinal(data.getBytes("UTF-8"));
        return Base64.getEncoder().encodeToString(encryptedBytes);
    }

    public static String decrypt(String encryptedData, SecretKeySpec key) throws Exception {
        Cipher cipher = Cipher.getInstance("DES");
        cipher.init(Cipher.DECRYPT_MODE, key);
        byte[] decodedBytes = Base64.getDecoder().decode(encryptedData);
        byte[] decryptedBytes = cipher.doFinal(decodedBytes);
        return new String(decryptedBytes, "UTF-8");
    }

测试用例

public static void main(String[] args) {
    try {
        String key = DesPasswordUtil.WIFI_DES_KEY;
        System.out.println("生成的密钥：" + DesPasswordUtil.WIFI_DES_KEY);

        SecretKeySpec keySpec = DesPasswordUtil.createKeyFromText(key);

        String data = "qwe123456!";
        String encryptedData = DesPasswordUtil.encrypt(data, keySpec);
        System.out.println("加密后的数据：" + encryptedData);

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

输出结果

生成的密钥：TmuhP9PD
加密后的数据：G/uUbLmmnTFL1S9oEUzsNw==
解密后的数据：qwe123456!