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#ifdef _WIN32
#include <Wincrypt.h>
#else
#include <fcntl.h>
#include <unistd.h>
/* for defined(BSD) */
#include <sys/param.h>
#ifdef BSD
/* for SYS_getentropy */
#include <sys/syscall.h>
#endif
#ifdef __APPLE__
#include <sys/random.h>
/* To support weak linking we need to declare this as a weak import even if
* it's not present in sys/random (e.g. macOS < 10.12). */
extern int getentropy(void *buffer, size_t size) __attribute((weak_import));
#endif
#ifdef __linux__
/* for SYS_getrandom */
#include <sys/syscall.h>
#ifndef GRND_NONBLOCK
#define GRND_NONBLOCK 0x0001
#endif /* GRND_NONBLOCK */
#endif /* __linux__ */
#endif /* _WIN32 */
#define CRYPTOGRAPHY_OSRANDOM_ENGINE_CRYPTGENRANDOM 1
#define CRYPTOGRAPHY_OSRANDOM_ENGINE_GETENTROPY 2
#define CRYPTOGRAPHY_OSRANDOM_ENGINE_GETRANDOM 3
#define CRYPTOGRAPHY_OSRANDOM_ENGINE_DEV_URANDOM 4
#ifndef CRYPTOGRAPHY_OSRANDOM_ENGINE
#if defined(_WIN32)
/* Windows */
#define CRYPTOGRAPHY_OSRANDOM_ENGINE CRYPTOGRAPHY_OSRANDOM_ENGINE_CRYPTGENRANDOM
#elif defined(BSD) && defined(SYS_getentropy)
/* OpenBSD 5.6+ & macOS with SYS_getentropy defined, although < 10.12 will fallback
* to urandom */
#define CRYPTOGRAPHY_OSRANDOM_ENGINE CRYPTOGRAPHY_OSRANDOM_ENGINE_GETENTROPY
#elif defined(__linux__) && defined(SYS_getrandom)
/* Linux 3.4.17+ */
#define CRYPTOGRAPHY_OSRANDOM_ENGINE CRYPTOGRAPHY_OSRANDOM_ENGINE_GETRANDOM
#else
/* Keep this as last entry, fall back to /dev/urandom */
#define CRYPTOGRAPHY_OSRANDOM_ENGINE CRYPTOGRAPHY_OSRANDOM_ENGINE_DEV_URANDOM
#endif
#endif /* CRYPTOGRAPHY_OSRANDOM_ENGINE */
/* Fallbacks need /dev/urandom helper functions. */
#if CRYPTOGRAPHY_OSRANDOM_ENGINE == CRYPTOGRAPHY_OSRANDOM_ENGINE_GETRANDOM || \
CRYPTOGRAPHY_OSRANDOM_ENGINE == CRYPTOGRAPHY_OSRANDOM_ENGINE_DEV_URANDOM || \
(CRYPTOGRAPHY_OSRANDOM_ENGINE == CRYPTOGRAPHY_OSRANDOM_ENGINE_GETENTROPY && \
defined(__APPLE__))
#define CRYPTOGRAPHY_OSRANDOM_NEEDS_DEV_URANDOM 1
#endif
enum {
CRYPTOGRAPHY_OSRANDOM_GETRANDOM_INIT_FAILED = -2,
CRYPTOGRAPHY_OSRANDOM_GETRANDOM_NOT_INIT,
CRYPTOGRAPHY_OSRANDOM_GETRANDOM_FALLBACK,
CRYPTOGRAPHY_OSRANDOM_GETRANDOM_WORKS
};
enum {
CRYPTOGRAPHY_OSRANDOM_GETENTROPY_NOT_INIT,
CRYPTOGRAPHY_OSRANDOM_GETENTROPY_FALLBACK,
CRYPTOGRAPHY_OSRANDOM_GETENTROPY_WORKS
};
/* engine ctrl */
#define CRYPTOGRAPHY_OSRANDOM_GET_IMPLEMENTATION ENGINE_CMD_BASE
/* error reporting */
static void ERR_load_Cryptography_OSRandom_strings(void);
static void ERR_Cryptography_OSRandom_error(int function, int reason,
char *file, int line);
#define CRYPTOGRAPHY_OSRANDOM_F_INIT 100
#define CRYPTOGRAPHY_OSRANDOM_F_RAND_BYTES 101
#define CRYPTOGRAPHY_OSRANDOM_F_FINISH 102
#define CRYPTOGRAPHY_OSRANDOM_F_DEV_URANDOM_FD 300
#define CRYPTOGRAPHY_OSRANDOM_F_DEV_URANDOM_READ 301
#define CRYPTOGRAPHY_OSRANDOM_R_CRYPTACQUIRECONTEXT 100
#define CRYPTOGRAPHY_OSRANDOM_R_CRYPTGENRANDOM 101
#define CRYPTOGRAPHY_OSRANDOM_R_CRYPTRELEASECONTEXT 102
#define CRYPTOGRAPHY_OSRANDOM_R_GETENTROPY_FAILED 200
#define CRYPTOGRAPHY_OSRANDOM_R_DEV_URANDOM_OPEN_FAILED 300
#define CRYPTOGRAPHY_OSRANDOM_R_DEV_URANDOM_READ_FAILED 301
#define CRYPTOGRAPHY_OSRANDOM_R_GETRANDOM_INIT_FAILED 400
#define CRYPTOGRAPHY_OSRANDOM_R_GETRANDOM_INIT_FAILED_UNEXPECTED 402
#define CRYPTOGRAPHY_OSRANDOM_R_GETRANDOM_FAILED 403
#define CRYPTOGRAPHY_OSRANDOM_R_GETRANDOM_NOT_INIT 404
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