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| author | Garrett D'Amore <garrett@damore.org> | 2017-01-08 15:28:37 -0800 |
|---|---|---|
| committer | Garrett D'Amore <garrett@damore.org> | 2017-01-08 17:33:05 -0800 |
| commit | c5b5bd910507520f7974a156a1de9d187f23bc2f (patch) | |
| tree | 9766716c795d88fe902c7196696c1389d76717ba /src/platform/posix/posix_config.h | |
| parent | 4b166dd8ae417b818a5ba214d8f2e648ac1d5be9 (diff) | |
| download | nng-c5b5bd910507520f7974a156a1de9d187f23bc2f.tar.gz nng-c5b5bd910507520f7974a156a1de9d187f23bc2f.tar.bz2 nng-c5b5bd910507520f7974a156a1de9d187f23bc2f.zip | |
New ISAAC pRNG. This replaces other local hacks for random data.
Platforms must seed the pRNGs by offering an nni_plat_seed_prng()
routine. Implementations for POSIX using various options (including
the /dev/urandom device) are supplied.
Diffstat (limited to 'src/platform/posix/posix_config.h')
| -rw-r--r-- | src/platform/posix/posix_config.h | 25 |
1 files changed, 20 insertions, 5 deletions
diff --git a/src/platform/posix/posix_config.h b/src/platform/posix/posix_config.h index 6d282f63..e1bafd5c 100644 --- a/src/platform/posix/posix_config.h +++ b/src/platform/posix/posix_config.h @@ -27,23 +27,38 @@ // is defined. Platforms that don't use POSIX clocks will probably // ignore any setting here. // -// #define NNG_HAVE_ARC4RANDOM -// This indicates that the platform has the superior arc4random function -// for getting entropy. -// // #define NNG_HAVE_BACKTRACE // If your system has a working backtrace(), and backtrace_symbols(), // along with <execinfo.h>, you can define this to get richer backtrace // information for debugging. +// +// #define NNG_USE_GETRANDOM +// #define NNG_USE_GETENTROPY +// #define NNG_USE_ARC4RANDOM +// #define NNG_USE_DEVURANDOM +// Thesse are options for obtaining entropy to seed the pRNG. +// All known modern UNIX variants can support NNG_USE_DEVURANDOM, +// but the other options are better still, but not portable. #include <time.h> +// These are things about systems we know about. +#ifdef __APPLE__ // MacOS X used to lack CLOCK_MONOTONIC. Now it has it, but its // buggy, condition variables set to use it wake early. -#ifdef __APPLE__ #define NNG_USE_CLOCKID CLOCK_REALTIME +// macOS 10.12 has getentropy(), but arc4random() is good enough +// and works on older releases. +#define NNG_USE_ARC4RANDOM 1 #endif // __APPLE__ +// It should never hurt to use DEVURANDOM, since if the device does not +// exist then we won't open it. (Provided: it would be bad if the device +// exists but has somehow very very different semantics. We don't know +// of any such concerns.) This won't be used if any of the other options +// are defined and work. +#define NNG_USE_DEVURANDOM 1 + #define NNG_USE_CLOCKID CLOCK_REALTIME #ifndef CLOCK_REALTIME #define NNG_USE_GETTIMEOFDAY |