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Add entropy pool and strong random number generator

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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.
This commit is contained in:
Jussi Kivilinna
2017-03-30 07:38:37 -06:00
committed by Gregory Nutt
parent 21545ab643
commit dffb8a67e3
50 changed files with 2005 additions and 9 deletions
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include/sys/syscall.h
+12 -3
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@@ -524,10 +524,19 @@
/* The following is defined only if CONFIG_TASK_NAME_SIZE > 0 */
#if CONFIG_TASK_NAME_SIZE > 0
# define SYS_prctl (SYS_nnetsocket+0)
# define SYS_maxsyscall (SYS_nnetsocket+1)
# define SYS_prctl (SYS_nnetsocket+1)
#else
# define SYS_maxsyscall SYS_nnetsocket
# define SYS_prctl SYS_nnetsocket
#endif
/* The following is defined only if entropy pool random number generator
* is enabled. */
#ifdef CONFIG_CRYPTO_RANDOM_POOL
# define SYS_getrandom (SYS_prctl+1)
# define SYS_maxsyscall (SYS_prctl+2)
#else
# define SYS_maxsyscall SYS_prctl
#endif
/* Note that the reported number of system calls does *NOT* include the