9 commits

Author	SHA1	Message	Date
Jussi Kivilinna	dffb8a67e3	Add entropy pool and strong random number generator ... Entropy pool gathers environmental noise from device drivers, user-space, etc., and returns good random numbers, suitable for cryptographic use. Based on entropy pool design from *BSDs and uses BLAKE2Xs algorithm for CSPRNG output. Patch also adds /dev/urandom support for using entropy pool RNG and new 'getrandom' system call for getting randomness without file-descriptor usage (thus avoiding file-descriptor exhaustion attacks). The 'getrandom' interface is similar as 'getentropy' and 'getrandom' available on OpenBSD and Linux respectively.	2017-03-30 07:38:37 -06:00
Gregory Nutt	60b70f7dbb	Make xorshift128 re-entrant so that we do do have to suffer the overhad of serialization controls.	2016-08-21 07:47:53 -06:00
Gregory Nutt	6f833be9d5	Separate XorShift128 PRNG from /dev/urandom and make it generally available.	2016-08-20 11:36:02 -06:00
Gregory Nutt	7370d3171a	Move include/nuttx/lib.h to include/nuttx/lib/lib.h	2016-07-21 14:05:44 -06:00
Gregory Nutt	4b4dbc79a2	Move driver related prototypes out of include/nuttx/fs/fs.h and into new include/drivers/drivers.h	2016-07-20 13:15:37 -06:00
Gregory Nutt	e0aaa168aa	/dev/urandom: Add option to replace software PRNG with hardware TRNG.	2016-07-18 07:03:47 -06:00
Gregory Nutt	07e20479ad	/dev/random: Add configuration option to use the congruential PRNG.	2016-07-17 07:56:25 -06:00
Gregory Nutt	ffd3a31649	Rename lib_rand.c to lib_srand.c	2016-07-17 07:11:09 -06:00
David Alessio	6cefbc0c3f	This change provides an option to add /dev/urandom to all architectures. The pseudo-random algorithm I choose strikes an arguably-good balance between being "random" and small/fast enough for 8/16 bit MCUs. It’s the well-documented xorshift128 algorithm. It has an internal state of 128 bits that can be [re-]seeded with a write.	2016-07-17 06:42:26 -06:00