[onerng talk] OneRNG for Windows

[Paul Campbell]

On Thu, 09 Apr 2015 10:43:10 AyrA wrote:
> I started a C# Project (.NET 2.0) to simplify OneRNG usage on Windows.
> 
> Since Windows lacks a global random device, I have written this application
> to serve as said device.
> 
> Project: https://github.com/AyrA/WinOneRNG


great!

There is a windows kernel API for  providing entropy  we just haven't found 
anyone with the knowledge to do the work - docs are here

http://csrc.nist.gov/groups/STM/cmvp/documents/140-1/140sp/140sp1328.pdf

I wrote the following code skeleton as an (untested) start to a daemon to copy 
onerng entropy into windows

	Paul

main(int argc, char **argv)
{

	ENTROPY_SOURCE_HANDLE h;
	unsigned char buff[256];
	int fd = open(argv[1], O_RDWR); // get the name of the OneRNG device 
                                                   //from some plug script	

	// do something to turn off echo/etc
	write(fd, "cmd0", 4);
	write(fd, "cmdO", 4);
	EntropyRegisterSource(&h, some-type-value, "OneRNG");

	for (;;) {
        	l = read(fd, buff, sizeof(buff));
        	if (l < 0)
                	break;
        
        	EntropyProvideData(h, &buff[0], l, l*75/80); // assuming 
7.5bits/byte
	}

	EntropyUnregisterSource(h);
	exit(0);
}