pal_plat_rot_insecure.c

/*
 * Copyright (c) 2016-2018 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.
 */

#include "pal.h"
#include "mbed-trace/mbed_trace.h"

#define TRACE_GROUP "ROT"

#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 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
    static bool runOnce = true;
    if (runOnce) {

        tr_warn("You are using insecure Root Of Trust implementation");
        runOnce = false;
    }

    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;
}