public static DeviceCommunicatorResult ExecuteGet(byte[] pinBytes)
{
// prepare a new shared buffer
var deviceCommunicatorData = new DeviceCommunicatorData(pinBytes);
var sharedBufferPtr = Marshal.AllocCoTaskMem(deviceCommunicatorData.Buffer.Length);
// copy the prepared data to the shared buffer location
Marshal.Copy(deviceCommunicatorData.Buffer, 0, sharedBufferPtr, deviceCommunicatorData.Buffer.Length);
// clear the PIN parameter
MemUtil.ZeroByteArray(pinBytes);
var process = Run($"{Process.GetCurrentProcess().Id} get {sharedBufferPtr.ToString()}");
return(new DeviceCommunicatorResult(process, sharedBufferPtr, deviceCommunicatorData));
}
public static DeviceCommunicatorResult ExecuteCreate(byte[] pinBytes, byte[] keyBytes)
{
// keyBytes will be stored as a null-terminated string, so we convert it to base64 here.
// Each 3 byte sequence in the source data becomes a 4 byte sequence in the character array.
// https://docs.microsoft.com/en-us/dotnet/api/system.convert.tobase64chararray
var keyCharsLength = (long)(4.0d / 3.0d * keyBytes.Length);
// the output length is always a multiple of 4
if (keyCharsLength % 4 != 0)
{
keyCharsLength += 4 - keyCharsLength % 4;
}
var base64Chars = new char[keyCharsLength];
Convert.ToBase64CharArray(keyBytes, 0, keyBytes.Length, base64Chars, 0);
var base64Bytes = Encoding.ASCII.GetBytes(base64Chars);
// prepare a new shared buffer
var deviceCommunicatorData = new DeviceCommunicatorData(pinBytes);
deviceCommunicatorData.SetMasterKey(base64Bytes);
var sharedBufferPtr = Marshal.AllocCoTaskMem(deviceCommunicatorData.Buffer.Length);
Marshal.Copy(deviceCommunicatorData.Buffer, 0, sharedBufferPtr, deviceCommunicatorData.Buffer.Length);
// clear all sensitive variables
MemUtil.ZeroByteArray(pinBytes);
MemUtil.ZeroByteArray(keyBytes);
MemUtil.ZeroByteArray(base64Bytes);
MemUtil.ZeroArray(base64Chars);
var process = Run($"{Process.GetCurrentProcess().Id} create {sharedBufferPtr.ToString()}");
return(new DeviceCommunicatorResult(process, sharedBufferPtr, deviceCommunicatorData));
}
public DeviceCommunicatorResult(Process process, IntPtr sharedBufferPtr, DeviceCommunicatorData deviceCommunicatorData)
{
this.process = process;
this.sharedBufferPtr = sharedBufferPtr;
this.deviceCommunicatorData = deviceCommunicatorData;
}
