java hmac加盐加密

    // 生成加密key:64个字节
        KeyGenerator keyGen = KeyGenerator.getInstance("HmacMD5");
        SecretKey secretKey = keyGen.generateKey();
        // 查看key
        byte[] encoded = secretKey.getEncoded();
        BigInteger bigInteger = new BigInteger(1, encoded);
        String s = bigInteger.toString(16);
        //加密：你好hmac
        Mac hmacMD5 = Mac.getInstance("hmacMD5");
        hmacMD5.init(secretKey);
        hmacMD5.update("bob".getBytes(StandardCharsets.UTF_8));
        byte[] bytes = hmacMD5.doFinal();
        String s1 = new BigInteger(1, bytes).toString(16);
        System.out.println(s1);
        // 根据64个字节数组恢复key
        SecretKeySpec mykey = new SecretKeySpec(encoded, "HmacMD5");
        Mac hmacMD52 = Mac.getInstance("hmacMD5");
        hmacMD52.init(mykey);
        hmacMD52.update("bob".getBytes(StandardCharsets.UTF_8));
        byte[] bytes2 = hmacMD5.doFinal();
        String s12 = new BigInteger(1, bytes2).toString(16);
        System.out.println(s12);