public static object ParseRequest(byte[] request)
{
if (request.Length < 1)
{
Console.Error.WriteLine("Received request with no bytes");
return(new Common.InvalidRequest());
}
if (request[0] == 1)
{
return(Common.GetQuoteRequest.ParseRequest(request));
}
if (request[0] == 2)
{
return(CreateCounterRequest.ParseRequest(request));
}
if (request[0] == 3)
{
return(AdvanceCounterRequest.ParseRequest(request));
}
Console.Error.WriteLine("Received request with invalid type");
return(new Common.InvalidRequest());
}
public byte[] HandleRequest(byte[] requestBytes)
{
object request = TrIncRequest.ParseRequest(requestBytes);
if (request is Common.GetQuoteRequest)
{
GetQuoteResponse getQuoteResponse = new GetQuoteResponse(0, key_pair);
return(getQuoteResponse.Encode());
}
if (request is CreateCounterRequest)
{
CreateCounterRequest r = (CreateCounterRequest)request;
RSACryptoServiceProvider public_key = CommonRoutines.DecodePublicKey(r.public_key);
if (public_key == null)
{
return(TrIncSrvResponse.EncodeCreateCounterResponse(3, 0));
}
TrIncCounter counter = new TrIncCounter(public_key);
counters.Add(counter);
UInt32 counter_index = (UInt32)(counters.Count - 1);
return(TrIncSrvResponse.EncodeCreateCounterResponse(0, counter_index));
}
if (request is AdvanceCounterRequest)
{
AdvanceCounterRequest r = (AdvanceCounterRequest)request;
if (r.counter_index < 0 || r.counter_index >= counters.Count)
{
Console.Error.WriteLine("Received request for invalid counter index {0}", r.counter_index);
return(TrIncSrvResponse.EncodeAdvanceCounterResponse(1, new byte[0], new byte[0]));
}
TrIncCounter counter = counters[(int)r.counter_index];
byte[] req = CommonRoutines.CombineByteArrays(r.new_counter_value, r.message);
if (!counter.PublicKey.VerifyData(req, CryptoConfig.MapNameToOID("SHA256"), r.request_attestation))
{
Console.Error.WriteLine("Received invalid request attestation");
return(TrIncSrvResponse.EncodeAdvanceCounterResponse(5, new byte[0], new byte[0]));
}
int offset = 0;
BigInteger new_counter_value = CommonRoutines.DecodeMPBigInteger(r.new_counter_value, ref offset);
if (new_counter_value < 0 || offset != r.new_counter_value.Length)
{
Console.Error.WriteLine("Received invalid new counter value encoding");
return(TrIncSrvResponse.EncodeAdvanceCounterResponse(6, new byte[0], new byte[0]));
}
if (new_counter_value < counter.Value)
{
Console.Error.WriteLine("New counter value requested {0} is smaller than current counter value {1}", new_counter_value, counter.Value);
return(TrIncSrvResponse.EncodeAdvanceCounterResponse(7, new byte[0], new byte[0]));
}
BigInteger old_counter_value = counter.Value;
counter.Value = new_counter_value;
byte[] header = new byte[1];
header[0] = 34;
byte[] counter_index_encoding = CommonRoutines.EncodeBEWord(r.counter_index);
byte[] old_counter_value_encoding = CommonRoutines.EncodeMPBigInteger(old_counter_value);
byte[] new_counter_value_encoding = CommonRoutines.EncodeMPBigInteger(new_counter_value);
byte[] trinc_statement = CommonRoutines.CombineByteArrays(header, counter_index_encoding, old_counter_value_encoding, new_counter_value_encoding, r.message);
byte[] trinc_attestation = key_pair.SignData(trinc_statement, CryptoConfig.MapNameToOID("SHA256"));
return(TrIncSrvResponse.EncodeAdvanceCounterResponse(0, trinc_statement, trinc_attestation));
}
return(InvalidResponse.Encode());
}