BouncyCastle TimeStampProtocol |如何从TimeStampToken获取原始哈希?

问题描述 投票:2回答:1

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

TSA响应了Granted响应,我得到了带有时间戳的字节数组。

如何获取原始散列数据,以便我可以验证TSA发送的TimeStamp是否是我所拥有的那个?

提前致谢。

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
c# timestamp bouncycastle
1个回答
1
投票

您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

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