leon-mbs / dstusign Goto Github PK

// Add trusted timestamp attribute (example: OID for timestamp)
attrnWriter.PushSequence(); // Attribute sequence
attrnWriter.WriteObjectIdentifier("1.2.840.113549.1.9.16.2.14");
                                                             
byte[] trustedTimestamp = GetTrustedTimestampFromTSA(); 
attrnWriter.PushSetOf(); // SetOf for attribute value
attrnWriter.WriteOctetString(trustedTimestamp); // Include trusted timestamp
attrnWriter.PopSetOf();
attrnWriter.PopSequence();


asnWriter.PushSequence(); 
asnWriter.WriteObjectIdentifier("1.2.840.113549.1.9.16.2.14"); 
asnWriter.WriteOctetString(trustedTimestamp);
asnWriter.PopSequence();


 private static byte[] GetTrustedTimestampFromTSA()
{
    var timestamp = DateTimeOffset.UtcNow.ToString("yyyy-MM-ddTHH:mm:ssZ");
    return Encoding.ASCII.GetBytes(timestamp);
}