#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdint.h>

#ifdef _WIN32
#include <windows.h>
#include <wincrypt.h>
#endif

int libscrypt_salt_gen(uint8_t *salt, size_t len)
{
    unsigned char buf[len];
#ifdef _WIN32
    static HCRYPTPROV provider;
    if (!CryptAcquireContext(&provider, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
    {
        return -1;
    }

    if (!CryptGenRandom(provider, len, buf))
    {
        return -1;
    }
#else
    int urandom = open("/dev/urandom", O_RDONLY);

    if (urandom < 0)
    {
        return -1;
    }

    ssize_t result = read(urandom, buf, len);

    if (result < 0)
    {
        return -1;
    }
#endif
    memcpy(salt, buf, len);
    return 0;
}