public async Task <ECDSASignature> SignAsync(byte[] hash)
{
var ledgerManager = await GetLedger();
ledgerManager.SetCoinNumber(60);
var derivationData = Helpers.GetDerivationPathData(ledgerManager.CurrentCoin.App, ledgerManager.CurrentCoin.CoinNumber, 0, 0, false, ledgerManager.CurrentCoin.IsSegwit);
// Create base class like GetPublicKeyResponseBase and make the method more like GetAddressAsync
var firstRequest = new EthereumAppSignTransactionRequest(derivationData.Concat(hash).ToArray());
var response = await ledgerManager.SendRequestAsync <EthereumAppSignTransactionResponse, EthereumAppSignTransactionRequest>(firstRequest);
var signature = new ECDSASignature(new Org.BouncyCastle.Math.BigInteger(response.SignatureR), new Org.BouncyCastle.Math.BigInteger(response.SignatureS));
signature.V = new BigInteger(response.SignatureV).ToBytesForRLPEncoding();
return(signature);
}
private async Task <IEnumerable <byte[]> > WriteRequestAndReadAsync <TRequest>(TRequest request) where TRequest : RequestBase
{
var responseData = new List <byte[]>();
var apduChunks = request.ToAPDUChunks();
for (var i = 0; i < apduChunks.Count; i++)
{
var apduCommandChunk = apduChunks[i];
if (apduChunks.Count == 1)
{
//There is only one chunk so use the argument from the request (e.g P1_SIGN)
apduCommandChunk[2] = request.Argument1;
}
else if (apduChunks.Count > 1)
{
//There are multiple chunks so the assumption is that this is probably a transaction
if (i == 0)
{
//This is the first chunk of the transaction
apduCommandChunk[2] = Constants.P1_FIRST;
}
else if (i == (apduChunks.Count - 1))
{
//This is the last chunk of the transaction
apduCommandChunk[2] = Constants.P1_LAST;
}
else
{
//This is one of the middle chunks and there is more coming
apduCommandChunk[2] = Constants.P1_MORE;
}
}
var packetIndex = 0;
byte[] data = null;
using (var memoryStream = new MemoryStream(apduCommandChunk))
{
do
{
data = Helpers.GetRequestDataPacket(memoryStream, packetIndex);
packetIndex++;
await LedgerHidDevice.WriteAsync(data);
} while (memoryStream.Position != memoryStream.Length);
}
var responseDataChunk = await ReadAsync();
responseData.Add(responseDataChunk);
var returnCode = ResponseBase.GetReturnCode(responseDataChunk);
if (returnCode != Constants.SuccessStatusCode)
{
return(responseData);
}
}
return(responseData);
}