How do I get the signature in a TimeStampToken (Bouncy Castle)

Question

From RFC 3852 (and RFC 3161) I understand that the signature value is stored as an attribute of the SignerInfo type of the TimestampToken (which is a Signed Data content type).

How can I get that signature value from a TimeStampToken instance of Bouncy Castle (in C#)?

Answer 1

I was able to get the signature using this:

CmsSignedData tsTokenCms = timestampToken.ToCmsSignedData();
SignerInformationStore signerInfoStore = tsTokenCms.GetSignerInfos();
SignerInformation signerInfo = signerInfoStore.GetFirstSigner(timestampToken.SignerID);
byte[] signatureBytes = signerInfo.GetSignature();
string signatureString = BitConverter.ToString(signatureBytes);
Console.WriteLine("Signature is: " + signatureString);