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Diffstat (limited to 'src/tpm2/Unique.c')
| -rw-r--r-- | src/tpm2/Unique.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/src/tpm2/Unique.c b/src/tpm2/Unique.c new file mode 100644 index 0000000..272d106 --- /dev/null +++ b/src/tpm2/Unique.c @@ -0,0 +1,109 @@ +/********************************************************************************/ +/* */ +/* Secret Value to the TPM */ +/* Written by Ken Goldman */ +/* IBM Thomas J. Watson Research Center */ +/* $Id: Unique.c 1490 2019-07-26 21:13:22Z kgoldman $ */ +/* */ +/* Licenses and Notices */ +/* */ +/* 1. Copyright Licenses: */ +/* */ +/* - Trusted Computing Group (TCG) grants to the user of the source code in */ +/* this specification (the "Source Code") a worldwide, irrevocable, */ +/* nonexclusive, royalty free, copyright license to reproduce, create */ +/* derivative works, distribute, display and perform the Source Code and */ +/* derivative works thereof, and to grant others the rights granted herein. */ +/* */ +/* - The TCG grants to the user of the other parts of the specification */ +/* (other than the Source Code) the rights to reproduce, distribute, */ +/* display, and perform the specification solely for the purpose of */ +/* developing products based on such documents. */ +/* */ +/* 2. Source Code Distribution Conditions: */ +/* */ +/* - Redistributions of Source Code must retain the above copyright licenses, */ +/* this list of conditions and the following disclaimers. */ +/* */ +/* - Redistributions in binary form must reproduce the above copyright */ +/* licenses, this list of conditions and the following disclaimers in the */ +/* documentation and/or other materials provided with the distribution. */ +/* */ +/* 3. Disclaimers: */ +/* */ +/* - THE COPYRIGHT LICENSES SET FORTH ABOVE DO NOT REPRESENT ANY FORM OF */ +/* LICENSE OR WAIVER, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, WITH */ +/* RESPECT TO PATENT RIGHTS HELD BY TCG MEMBERS (OR OTHER THIRD PARTIES) */ +/* THAT MAY BE NECESSARY TO IMPLEMENT THIS SPECIFICATION OR OTHERWISE. */ +/* Contact TCG Administration (admin@trustedcomputinggroup.org) for */ +/* information on specification licensing rights available through TCG */ +/* membership agreements. */ +/* */ +/* - THIS SPECIFICATION IS PROVIDED "AS IS" WITH NO EXPRESS OR IMPLIED */ +/* WARRANTIES WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR */ +/* FITNESS FOR A PARTICULAR PURPOSE, ACCURACY, COMPLETENESS, OR */ +/* NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS, OR ANY WARRANTY */ +/* OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR SAMPLE. */ +/* */ +/* - Without limitation, TCG and its members and licensors disclaim all */ +/* liability, including liability for infringement of any proprietary */ +/* rights, relating to use of information in this specification and to the */ +/* implementation of this specification, and TCG disclaims all liability for */ +/* cost of procurement of substitute goods or services, lost profits, loss */ +/* of use, loss of data or any incidental, consequential, direct, indirect, */ +/* or special damages, whether under contract, tort, warranty or otherwise, */ +/* arising in any way out of use or reliance upon this specification or any */ +/* information herein. */ +/* */ +/* (c) Copyright IBM Corp. and others, 2016 - 2019 */ +/* */ +/********************************************************************************/ + +/* C.12 Unique.c */ +/* C.12.1. Introduction */ +/* In some implementations of the TPM, the hardware can provide a secret value to the TPM. This + secret value is statistically unique to the instance of the TPM. Typical uses of this value are + to provide personalization to the random number generation and as a shared secret between the TPM + and the manufacturer. */ +/* C.12.2. Includes */ +#include "Platform.h" +const char notReallyUnique[] = + "This is not really a unique value. A real unique value should" + " be generated by the platform."; +/* C.12.3. _plat__GetUnique() */ +/* This function is used to access the platform-specific unique value. This function places the + unique value in the provided buffer (b) and returns the number of bytes transferred. The function + will not copy more data than bSize. */ +/* NOTE: If a platform unique value has unequal distribution of uniqueness and bSize is smaller than + the size of the unique value, the bSize portion with the most uniqueness should be returned. */ +LIB_EXPORT uint32_t +_plat__GetUnique( + uint32_t which, // authorities (0) or details + uint32_t bSize, // size of the buffer + unsigned char *b // output buffer + ) +{ + const char *from = notReallyUnique; + uint32_t retVal = 0; + if(which == 0) // the authorities value + { + for(retVal = 0; + *from != 0 && retVal < bSize; + retVal++) + { + *b++ = *from++; + } + } + else + { +#define uSize sizeof(notReallyUnique) + b = &b[((bSize < uSize) ? bSize : uSize) - 1]; + for(retVal = 0; + *from != 0 && retVal < bSize; + retVal++) + { + *b-- = *from++; + } + } + return retVal; +} |