充气城堡时间戳协议 |如何从时间戳令牌获取原始哈希?

Question

>我已经从散列数据创建了一个TimeStampRequest并将其发送到tsa。

TSA 以授予响应响应响应，我得到了带有时间戳的字节数组。

如何获取原始哈希数据，以便验证 TSA 发送的时间戳是否是我想要拥有的时间戳？

提前谢谢。

请求

TimeStampRequestGenerator reqGen = new TimeStampRequestGenerator();
SHA1 sha1 = SHA1CryptoServiceProvider.Create();
ValidateInput(data);
reqGen.SetCertReq(true);
Hash = sha1.ComputeHash(Encoding.UTF8.GetBytes(data));
TimeStampRequest request = reqGen.Generate(
TspAlgorithms.Sha1, Hash, BigInteger.ValueOf(100));
byte[] reqData = request.GetEncoded();
record.DtRequest = DateTime.Now;
HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(stampURI);
httpReq.Method = "POST";
httpReq.ContentType = "application/timestamp-query";
httpReq.ContentLength = reqData.Length;
// Write the request content
Stream reqStream = httpReq.GetRequestStream();
reqStream.Write(reqData, 0, reqData.Length);
reqStream.Close();
HttpWebResponse httpResp = (HttpWebResponse)httpReq.GetResponse();
// Read the response
Stream respStream = new BufferedStream(httpResp.GetResponseStream());
TimeStampResponse response = new 
TimeStampResponse(respStream);
respStream.Close();
TimeStamp = response.TimeStampToken.GetEncoded();

验证

var TSToken = new TimeStampToken(new CmsSignedData(TSPTimeStamp.DataContent));
//Here, I should reverse the TimeStampToken to the original hash

Answer 1

可以使用此方法获取 TimeStampToken 的签名摘要

byte[] digest = TSToken.TimeStampInfo.GetMessageImprintDigest();

然后，您可以将该值与原始Hash值进行比较