diff options
| -rw-r--r-- | configure.ac | 7 | ||||
| -rw-r--r-- | src/random.cpp | 20 |
2 files changed, 8 insertions, 19 deletions
diff --git a/configure.ac b/configure.ac index 078e113e95..6b172959f4 100644 --- a/configure.ac +++ b/configure.ac @@ -1112,13 +1112,6 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <unistd.h> [ AC_MSG_RESULT([no])] ) -AC_MSG_CHECKING([for getentropy]) -AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <unistd.h>]], - [[ getentropy(nullptr, 32) ]])], - [ AC_MSG_RESULT([yes]); AC_DEFINE([HAVE_GETENTROPY], [1], [Define this symbol if the BSD getentropy system call is available]) ], - [ AC_MSG_RESULT([no])] -) - AC_MSG_CHECKING([for getentropy via random.h]) AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <unistd.h> #include <sys/random.h>]], diff --git a/src/random.cpp b/src/random.cpp index 5dae80fe31..b862510524 100644 --- a/src/random.cpp +++ b/src/random.cpp @@ -32,10 +32,8 @@ #include <sys/syscall.h> #include <linux/random.h> #endif -#if defined(HAVE_GETENTROPY) || (defined(HAVE_GETENTROPY_RAND) && defined(MAC_OSX)) -#include <unistd.h> -#endif #if defined(HAVE_GETENTROPY_RAND) && defined(MAC_OSX) +#include <unistd.h> #include <sys/random.h> #endif #ifdef HAVE_SYSCTL_ARND @@ -305,16 +303,14 @@ void GetOSRand(unsigned char *ent32) RandFailure(); } } -#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. +#elif defined(__OpenBSD__) + /* OpenBSD. From the arc4random(3) man page: + "Use of these functions is encouraged for almost all random number + consumption because the other interfaces are deficient in either + quality, portability, standardization, or availability." + The function call is always successful. */ - if (getentropy(ent32, NUM_OS_RANDOM_BYTES) != 0) { - RandFailure(); - } + arc4random_buf(ent32, NUM_OS_RANDOM_BYTES); // Silence a compiler warning about unused function. (void)GetDevURandom; #elif defined(HAVE_GETENTROPY_RAND) && defined(MAC_OSX) |