#include "string.h"
#include "stdlib.h"
#include "mbedtls/entropy.h"

#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)

static int os_get_random(unsigned char *buf, size_t len)
{
    int i, j;
    unsigned long tmp;

    for (i = 0; i < ((len + 3) & ~3) / 4; i++) {
        tmp = rand();

        for (j = 0; j < 4; j++) {
            if ((i * 4 + j) < len) {
                buf[i * 4 + j] = (unsigned char)(tmp >> (j * 8));
            } else {
                break;
            }
        }
    }

    return 0;
}

int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len, size_t *olen)
{
    os_get_random(output, len);
    *olen = len;

    return 0;
}

#endif