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random: only use getentropy on openbsd

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This commit is contained in:
Cory Fields 2017-07-17 13:14:53 -04:00
parent 0b019357ff
commit 077d01f2fc
1 changed files with 3 additions and 1 deletions
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4
src/random.cpp
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@ -227,10 +227,12 @@ void GetOSRand(unsigned char *ent32)
RandFailure();
}
}
#elif defined(HAVE_GETENTROPY)
#elif defined(HAVE_GETENTROPY) && defined(__OpenBSD__)
/* On OpenBSD this can return up to 256 bytes of entropy, will return an
* error if more are requested.
* The call cannot return less than the requested number of bytes.
getentropy is explicitly limited to openbsd here, as a similar (but not
the same) function may exist on other platforms via glibc.
*/
if (getentropy(ent32, NUM_OS_RANDOM_BYTES) != 0) {
RandFailure();