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88 lines
3.5 KiB
88 lines
3.5 KiB
7 months ago
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/* Microsoft Reference Implementation for TPM 2.0
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*
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* The copyright in this software is being made available under the BSD License,
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* included below. This software may be subject to other third party and
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* contributor rights, including patent rights, and no such rights are granted
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* under this license.
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*
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* Copyright (c) Microsoft Corporation
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*
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* All rights reserved.
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*
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* BSD License
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this list
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* of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ""AS IS""
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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//** Introduction
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// In some implementations of the TPM, the hardware can provide a secret
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// value to the TPM. This secret value is statistically unique to the
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// instance of the TPM. Typical uses of this value are to provide
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// personalization to the random number generation and as a shared secret
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// between the TPM and the manufacturer.
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//** Includes
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#include "Platform.h"
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const char notReallyUnique[] =
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"This is not really a unique value. A real unique value should"
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" be generated by the platform.";
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//** _plat__GetUnique()
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// This function is used to access the platform-specific unique value.
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// This function places the unique value in the provided buffer ('b')
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// and returns the number of bytes transferred. The function will not
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// copy more data than 'bSize'.
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// NOTE: If a platform unique value has unequal distribution of uniqueness
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// and 'bSize' is smaller than the size of the unique value, the 'bSize'
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// portion with the most uniqueness should be returned.
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LIB_EXPORT uint32_t
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_plat__GetUnique(
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uint32_t which, // authorities (0) or details
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uint32_t bSize, // size of the buffer
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unsigned char *b // output buffer
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)
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{
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const char *from = notReallyUnique;
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uint32_t retVal = 0;
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if(which == 0) // the authorities value
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{
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for(retVal = 0;
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*from != 0 && retVal < bSize;
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retVal++)
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{
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*b++ = *from++;
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}
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}
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else
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{
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#define uSize sizeof(notReallyUnique)
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b = &b[((bSize < uSize) ? bSize : uSize) - 1];
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for(retVal = 0;
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*from != 0 && retVal < bSize;
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retVal++)
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{
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*b-- = *from++;
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}
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}
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return retVal;
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}
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