/*******************************************************************************
 * Copyright 2016, 2017 ARM Ltd.
 *
 * 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.
 *******************************************************************************/
#include "pal.h"
#define PAL_DEVICE_KEY_SIZE_IN_BYTES 16

//THIS CODE IS FOR TESTING PURPOSES ONLY. DO NOT USE IN PRODUCTION ENVIRONMENTS. REPLACE WITH A PROPER IMPLEMENTATION BEFORE USE
palStatus_t  __attribute__((weak)) pal_plat_osGetRoTFromHW(uint8_t *keyBuf, size_t keyLenBytes)
{
    #if defined (__CC_ARM)          /* ARM compiler. */
    #warning("PAL_INSECURE- You are using insecure Root Of Trust implementation, DO NOT USE IN PRODUCTION ENVIRONMENTS. REPLACE WITH A PROPER IMPLEMENTATION BEFORE USE")
    #else
    #pragma message ("You are using insecure Root Of Trust implementation, DO NOT USE IN PRODUCTION ENVIRONMENTS. REPLACE WITH A PROPER IMPLEMENTATION BEFORE USE")
    #endif

	PAL_LOG(WARN, "You are using insecure Root Of Trust implementation");

    if (keyLenBytes < PAL_DEVICE_KEY_SIZE_IN_BYTES)
	{
		return PAL_ERR_BUFFER_TOO_SMALL;
	}

	if (NULL == keyBuf)
	{
        return PAL_ERR_NULL_POINTER;
	}

    for (int i=0; i < PAL_DEVICE_KEY_SIZE_IN_BYTES; i++)
    {
        keyBuf[i] = i;
    }
	return PAL_SUCCESS;
}
