Bouncy Castle - 在从 TimeStampResponse 签名之前获取哈希

Question

我正在使用 Bouncy Castle 从 TSA 获取签名哈希，就像这样-

TimeStampResponse GetSignedHashFromTsa(byte[] hash)
{
    TimeStampRequestGenerator reqGen = new TimeStampRequestGenerator();

    TimeStampRequest request = reqGen.Generate(
                TspAlgorithms.Sha1,
                hash,
                BigInteger.ValueOf(100)
            );
    byte[] reqData = request.GetEncoded();

    HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create("http://www.cryptopro.ru/tsp/tsp.srf");
    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();

    return response;
}

通过这个函数，我可以从 byte[].

得到 TimeStampResponse object (same in Java and C#)

我喜欢从另一个 class 中的 TimeStampResponse 对象获取 byte[]。有什么办法吗？

在此先感谢您的帮助。

重新

为了更好的理解Sai Ye Yan Naing Aye，我是这样调用函数的-

byte[] hashToSign = ....;
TimeStampResponse response = GetSignedHashFromTsa(hashToSign);
byte[] signedByteToSaveInFile = response.GetEncoded();

然后我将 signedByteToSaveInFile 保存在一个文件中。后来我试图找到 byte[] 签名的内容。说，我在做这个-

byte[] signedByteToSaveInFile = ....; //Read byte array from file
TimeStampResponse previouslyTsaSignedDataResponse = new TimeStampResponse(signedByteToSaveInFile);

现在我想获取在从 previouslyTsaSignedDataResponse 对象签名之前发送到 TSA 服务器的字节数组。所以，我想获取 byte[] hash 发送到 TSA 服务器进行签名的内容。换句话说，我喜欢在签名之前获取主要内容。

想想，现在问题更清楚了

Answer 1

我自己是这样解决的-

bool ValidateTimestamp(TimeStampResponse tr, byte[] hash)
{
    try
    {
        TimeStampRequestGenerator reqGen = new TimeStampRequestGenerator();
        TimeStampRequest request = reqGen.Generate(
                TspAlgorithms.Sha1,
                hash,
                BigInteger.ValueOf(100)
            );
    
        tr.Validate(request);
    }
    catch(Exception ex)
    {
        Console.WriteLine(ex.Message);
        return false;
    }
    return tr.GetFailInfo() == null;
}

Bouncy Castle - 在从 TimeStampResponse 签名之前获取哈希

Bouncy Castle - Get Hash before sign from TimeStampResponse

c#

java

asp.net

spring

bouncycastle

重新