验证URL有效性，返回字符串不匹配

java版接入isv 创建套件时回调URL提示 错误原因: 返回字符串不匹配
1. 按照 https://bbs.aliyun.com/read/291640.html?spm=5176.bbsl276.0.0.i3kF8H 这里的文档，下载了 [font="]ISV版Demo https://github.com/hetaoZhong/ding-isv-access
2. 编写修改 SuiteCallBackController：
·@ResponseBody
    @RequestMapping(value = "/suite/callback", method = { RequestMethod.POST })
    public Map<String, String> suiteCallback(
            @RequestParam(value = "signature", required = false) String signature,
            @RequestParam(value = "timestamp", required = false) String timestamp,
            @RequestParam(value = "nonce", required = false) String nonce,
            @RequestBody(required = false) JSONObject json) {
        try {
            String token = "HRSSCdingtoken";
            String aseKey = "501c90wn13nkc799vv58h1boefaezw7tuu3q8u20twz";
            String suitkey="suite4xxxxxxxxxxxxxxx";
            
            DingTalkEncryptor dingTalkEncryptor = new DingTalkEncryptor(token,aseKey, suitkey);
            String encryptMsg = json.getString("encrypt");
            String plainText = dingTalkEncryptor.getDecryptMsg(signature,timestamp, nonce, encryptMsg);
            JSONObject callbackMsgJson = JSONObject.parseObject(plainText);
            String random = callbackMsgJson.getString("Random");
            String responseEncryMsg = random;
            Map<String, String> encryptedMap = dingTalkEncryptor.getEncryptedMap(
                    responseEncryMsg,
                    System.currentTimeMillis(),
                    com.dingtalk.oapi.lib.aes.Utils.getRandomStr(8));
            return encryptedMap;
        } catch (Exception e) {
            e.printStackTrace();
            Map<String, String> errmap =new HashMap<String, String>();
            errmap.put("error", e.getMessage());
            return errmap;
        }
3.替换jdk 7的 local_policy.jar, US_export_policy.jar
4.开发者平台验证url有效性:
[attachment=122904]

提示 错误原因: 返回字符创不匹配
后台日志:

输入参数
signature: 948bcf4badf14ca07a7adc61b39a013df9888662
timestamp: 1490342383125
nonce: B26fpDKl
json:  
{
"encrypt": "PGXmyG3F7FvVm9ezRzjujy20FlMj8dP+b4r1MKW4O2rTxQpna/B942i6fSuoY1ZTTLS0hie5Si0aC4KNYT/mOZ1Upv+X1DeLGLsJ2XoE1kOVubx9ZUHQg6pw3O5IfqKZcQrCdgfYDmE/dyOKvzankNktNSuuSyxOzXnKYNtxhfPh7u5IJ04VBwcqVjn7aTbPVWyh3URZDtBCOVc7htM+kg=="
}
token: HRSSCdingtoken
aseKey: 501c90wn13nkc799vv58h1boefaezw7tuu3q8u20twz
suitkey: suite4xxxxxxxxxxxxxxx


返回的参数:
encryptedMap
{
timeStamp=1490343658926,
nonce=AGq8nznr, encrypt=F93VGofK/hTysDyjoCeO1rXa2cibpzt6EPB+3Tuol4uTYsBjz7riLeFTq4jjnEdjQedPxDOuH1k4uV5CYYdolg==, msg_signature=3c1b3cbe0c40eb99b29d1dc3dacfc09c25e6e61a
}
已经搞了一天了，求大神解决！