File content as of revision 4:e518dde96e59:

// ----------------------------------------------------------------------------
// Copyright 2016-2018 ARM Ltd.
//
// 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_plat_rtos.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_osGetRoT128Bit(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) {

        PAL_LOG(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;
}