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Alex Rivera
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I tried to implement in .NET C# an utility similar to signtool.exe. To digitally sign a file, I used the classes SignedCms and CmsSigner. CmsSigner signer; ... SignedCms content = new SignedCms(new ContentInfo(File.ReadAllBytes(aFileToSign))); content.ComputeSignature(signer, true); However, I am not sure how to add a timestamp received from a time server. signtool.exe has the option signtool sign /t "time server url" ... One possibility seems to consist in using Pkcs9SigningTime class, but I don't know how to use it correctly in conjuction with a timestamp server. All of the examples use Pkcs9SigningTime and the current time of the system. With a time server, it may be more complicated because the time server has its own certificate, and the answer will contain the time and a hash used as a countersignature. Can anyone provide some clues about that?
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