#include <openssl/rand.h>
#include "../bcm_support.h"
#include "../internal.h"
#include "sysrand_internal.h"
#if defined(OPENSSL_RAND_WINDOWS)
#include <limits.h>
#include <stdlib.h>
OPENSSL_MSVC_PRAGMA(warning(push, 3))
#include <windows.h>
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP) && \
!WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
#include <bcrypt.h>
OPENSSL_MSVC_PRAGMA(comment(lib, "bcrypt.lib"))
#endif
OPENSSL_MSVC_PRAGMA(warning(pop))
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP) && \
!WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
void CRYPTO_init_sysrand(void) {}
void CRYPTO_sysrand(uint8_t *out, size_t requested) {
while (requested > 0) {
ULONG output_bytes_this_pass = ULONG_MAX;
if (requested < output_bytes_this_pass) {
output_bytes_this_pass = (ULONG)requested;
}
if (!BCRYPT_SUCCESS(BCryptGenRandom(
NULL, out, output_bytes_this_pass,
BCRYPT_USE_SYSTEM_PREFERRED_RNG))) {
abort();
}
requested -= output_bytes_this_pass;
out += output_bytes_this_pass;
}
}
#else
typedef BOOL (WINAPI *ProcessPrngFunction)(PBYTE pbData, SIZE_T cbData);
static ProcessPrngFunction g_processprng_fn = NULL;
static void init_processprng(void) {
HMODULE hmod = LoadLibraryW(L"bcryptprimitives");
if (hmod == NULL) {
abort();
}
g_processprng_fn = (ProcessPrngFunction)GetProcAddress(hmod, "ProcessPrng");
if (g_processprng_fn == NULL) {
abort();
}
}
void CRYPTO_init_sysrand(void) {
static CRYPTO_once_t once = CRYPTO_ONCE_INIT;
CRYPTO_once(&once, init_processprng);
}
void CRYPTO_sysrand(uint8_t *out, size_t requested) {
CRYPTO_init_sysrand();
if (!g_processprng_fn(out, requested)) {
abort();
}
}
#endif
int CRYPTO_sysrand_if_available(uint8_t *buf, size_t len) {
CRYPTO_sysrand(buf, len);
return 1;
}
void CRYPTO_sysrand_for_seed(uint8_t *out, size_t requested) {
CRYPTO_sysrand(out, requested);
}
#endif