void
rust_win32_rand_release(HCRYPTPROV hProv) {
win32_require
(_T("CryptReleaseContext"), CryptReleaseContext(hProv, 0));
}
void
rust_win32_rand_acquire(HCRYPTPROV* phProv) {
win32_require
(_T("CryptAcquireContext"),
// changes to the parameters here should be reflected in the docs of
// std::rand::os::OSRng
CryptAcquireContext(phProv, NULL, NULL, PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT|CRYPT_SILENT));
}
void
rng_gen_seed(uint8_t* dest, size_t size) {
#ifdef __WIN32__
HCRYPTPROV hProv;
win32_require
(_T("CryptAcquireContext"),
CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT|CRYPT_SILENT));
win32_require
(_T("CryptGenRandom"), CryptGenRandom(hProv, size, (BYTE*) dest));
win32_require
(_T("CryptReleaseContext"), CryptReleaseContext(hProv, 0));
#else
int fd = open("/dev/urandom", O_RDONLY);
if (fd == -1) {
fprintf(stderr, "error opening /dev/urandom: %s", strerror(errno));
abort();
}
size_t amount = 0;
do {
ssize_t ret = read(fd, dest+amount, size-amount);
if (ret < 0) {
fprintf(stderr, "error reading /dev/urandom: %s", strerror(errno));
abort();
}
else if (ret == 0) {
fprintf(stderr, "somehow hit eof reading from /dev/urandom");
abort();
}
amount += (size_t)ret;
} while (amount < size);
int ret = close(fd);
if (ret != 0) {
fprintf(stderr, "error closing /dev/urandom: %s", strerror(errno));
// FIXME #3697: Why does this fail sometimes?
// abort();
}
#endif
}
void
rust_win32_rand_gen(HCRYPTPROV hProv, DWORD dwLen, BYTE* pbBuffer) {
win32_require
(_T("CryptGenRandom"), CryptGenRandom(hProv, dwLen, pbBuffer));
}
