AES,MD5加密

MD5加密不可逆

手机号码，密码等用AES加密

public class AESUtil {

    /**
     * 默认的密匙（服务端接口失败时使用）
     */
    public static final String SECRETKEY = "c98be79a4347bc97";
    /**
     * 偏移量
     */
    private static final String IV = "93x0ue23c2c9h8km";
    

    /**
     * AES加密
     *
     * @param data 要加密的数据
     * @param key  加密所使用的密钥
     * @return 加密后的数据
     * @throws GeneralSecurityException
     */
    public static byte[] encrypt(byte[] data, byte[] key) throws GeneralSecurityException {
        //根据给定的enCodeFormat字节数组构造一个用AES算法加密的密钥。
        SecretKey secretKey = new SecretKeySpec(key, "AES");
        // 创建密码器
        Cipher cipher = Cipher.getInstance("AES");
        // 以加密的方式用密钥初始化此 Cipher
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        //按byteContent单部分操作加密指定的byte, 返回加密过后的byteContent
        return cipher.doFinal(data);
    }

    public static String encrypt(byte[] data, String key) throws GeneralSecurityException {
        SecretKey secretKey = new SecretKeySpec(hexStringToBytes(key), "AES");
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        byte[] bytes = cipher.doFinal(data);
        //返回加密后的字符串
        return fromBytesToHex(bytes);
    }

    public static String encrypt(String content, String key) throws Exception{
        SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(), "AES");
        // "算法/模式/填充"
        Cipher cipher = Cipher.getInstance("AES/CBC/Pkcs5Padding");
        IvParameterSpec iv = new IvParameterSpec(IV.getBytes());
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
        byte[] encrypted = cipher.doFinal(content.getBytes("UTF-8"));
        String encode = Base64.encodeToString(encrypted, Base64.NO_WRAP);
        return encode;
    }
    

    public static String decrypt(String content, String key) throws Exception {
        SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(), "AES");
        // "算法/模式/填充"
        Cipher cipher = Cipher.getInstance("AES/CBC/Pkcs5Padding");
        IvParameterSpec iv = new IvParameterSpec(IV.getBytes());
        cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
        byte[] encrypted = cipher.doFinal(Base64.decode(content, Base64.DEFAULT));
        return new String(encrypted);
    }

    private static String fromBytesToHex(byte[] resultBytes) {
        StringBuilder builder = new StringBuilder();
        for (byte resultByte : resultBytes) {
            if (Integer.toHexString(0xFF & resultByte).length() == 1) {
                builder.append(0).append(Integer.toHexString(0xFF & resultByte));
            } else {
                builder.append(Integer.toHexString(0xFF & resultByte));
            }
        }
        return builder.toString();
    }

    private static byte[] hexStringToBytes(String str) {
        if (StringUtils.isNullOrEmpty(str)) {
            return new byte[0];
        }
        byte[] bytes = new byte[str.length() / 2];
        for (int i = 0; i < str.length() / 2; i++) {
            String subStr = str.substring(i * 2, i * 2 + 2);
            bytes[i] = (byte) Integer.parseInt(subStr, 16);
        }
        return bytes;
    }

}