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    /**
     * @Description: 签名(私钥加密)
     * @Param: oriData 待签名数据
     * @return: byte[] 数字签名
     */
    public byte[] sign(String oriData) throws Exception {
        byte[] data = oriData.getBytes();
        // 对数据加密
        KeyFactory keyFactory = KeyFactory.getInstance(keyAlgorithm);
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.ENCRYPT_MODE, privateKey);
        byte[] encrypted = cipher.doFinal(data);
        return encrypted;
    }


    /**
     * @Description: 验签(公钥解密)
     * @Param: sign 签名
     * @return: String 待校验数据
     */
    public String verify(byte[] sign) throws Exception {
        // 对数据解密
        KeyFactory keyFactory = KeyFactory.getInstance(keyAlgorithm);
        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.DECRYPT_MODE, publicKey);
        byte[] original = cipher.doFinal(sign);
        String originalString = new String(original);
        return originalString;
    }