/*
 *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
 *  SPDX-License-Identifier: Apache-2.0
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"); you may
 *  not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *  This file is part of mbed TLS (https://tls.mbed.org)
 */

#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif

#include <sys/types.h>
#include <stdlib.h>
#include <stdio.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