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#include "secure_random.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#if defined(_WIN32) && !defined(__CYGWIN__)
# ifndef WIN32_LEAN_AND_MEAN
# define WIN32_LEAN_AND_MEAN 1
# endif
# include <windows.h>
# include <wincrypt.h>
#else
# include <unistd.h>
#endif
kit_status_t kit_secure_random(i64 size, void *data) {
assert(size >= 0);
assert(data != NULL);
if (size <= 0 || data == NULL)
return KIT_ERROR_INVALID_ARGUMENT;
#if defined(_WIN32) && !defined(__CYGWIN__)
HCRYPTPROV prov = 0;
if (!CryptAcquireContextW(&prov, NULL, NULL, PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT | CRYPT_SILENT) ||
!CryptGenRandom(prov, (DWORD) size, (BYTE *) data) ||
!CryptReleaseContext(prov, 0))
return KIT_ERROR_RESOURCE_UNAVAILABLE;
#else
FILE *f = fopen("/dev/urandom", "rb");
if (f == NULL)
return KIT_ERROR_RESOURCE_UNAVAILABLE;
i64 n = (i64) fread(data, 1, size, f);
fclose(f);
if (n != size)
return KIT_ERROR_RESOURCE_UNAVAILABLE;
#endif
return KIT_OK;
}
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