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Diffstat (limited to 'src/tpm2/BnMemory.c')
| -rw-r--r-- | src/tpm2/BnMemory.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/src/tpm2/BnMemory.c b/src/tpm2/BnMemory.c new file mode 100644 index 0000000..620ca99 --- /dev/null +++ b/src/tpm2/BnMemory.c @@ -0,0 +1,205 @@ +/********************************************************************************/ +/* */ +/* */ +/* Written by Ken Goldman */ +/* IBM Thomas J. Watson Research Center */ +/* $Id: BnMemory.c 1262 2018-07-11 21:03:43Z 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 */ +/* */ +/********************************************************************************/ + +/* 10.2.5 BnMemory.c */ +/* 10.2.5.1 Introduction */ +/* This file contains the memory setup functions used by the bigNum functions in CryptoEngine() */ +/* 10.2.5.2 Includes */ +#include "Tpm.h" +/* 10.2.5.3 Functions */ +/* 10.2.5.3.1 BnSetTop() */ +/* This function is used when the size of a bignum_t is changed. It makes sure that the unused words + are set to zero and that any significant words of zeros are eliminated from the used size + indicator. */ +LIB_EXPORT bigNum +BnSetTop( + bigNum bn, // IN/OUT: number to clean + crypt_uword_t top // IN: the new top + ) +{ + if(bn != NULL) + { + pAssert(top <= bn->allocated); + // If forcing the size to be decreased, make sure that the words being + // discarded are being set to 0 + while(bn->size > top) + bn->d[--bn->size] = 0; + bn->size = top; + // Now make sure that the words that are left are 'normalized' (no high-order + // words of zero. + while((bn->size > 0) && (bn->d[bn->size - 1] == 0)) + bn->size -= 1; + } + return bn; +} +#if 0 /* libtpms added */ +/* 10.2.5.3.2 BnClearTop() */ +/* This function will make sure that all unused words are zero. */ +LIB_EXPORT bigNum +BnClearTop( + bigNum bn + ) +{ + crypt_uword_t i; + // + if(bn != NULL) + { + for(i = bn->size; i < bn->allocated; i++) + bn->d[i] = 0; + while((bn->size > 0) && (bn->d[bn->size] == 0)) + bn->size -= 1; + } + return bn; +} +#endif /* libtpms added */ +/* 10.2.5.3.3 BnInitializeWord() */ +/* This function is used to initialize an allocated bigNum with a word value. The bigNum does not + have to be allocated with a single word. */ +LIB_EXPORT bigNum +BnInitializeWord( + bigNum bn, // IN: + crypt_uword_t allocated, // IN: + crypt_uword_t word // IN: + ) +{ + bn->allocated = allocated; + bn->size = (word != 0); + bn->d[0] = word; + while(allocated > 1) + bn->d[--allocated] = 0; + return bn; +} +/* 10.2.5.3.4 BnInit() */ +/* This function initializes a stack allocated bignum_t. It initializes allocated and size and zeros + the words of d. */ +LIB_EXPORT bigNum +BnInit( + bigNum bn, + crypt_uword_t allocated + ) +{ + if(bn != NULL) + { + bn->allocated = allocated; + bn->size = 0; + while(allocated != 0) + bn->d[--allocated] = 0; + } + return bn; +} +/* 10.2.5.3.5 BnCopy() */ +/* Function to copy a bignum_t. If the output is NULL, then nothing happens. If the input is NULL, + the output is set to zero. */ +LIB_EXPORT BOOL +BnCopy( + bigNum out, + bigConst in + ) +{ + if(in == out) + BnSetTop(out, BnGetSize(out)); + else if(out != NULL) + { + if(in != NULL) + { + unsigned int i; + pAssert(BnGetAllocated(out) >= BnGetSize(in)); + for(i = 0; i < BnGetSize(in); i++) + out->d[i] = in->d[i]; + BnSetTop(out, BnGetSize(in)); + } + else + BnSetTop(out, 0); + } + return TRUE; +} +#if ALG_ECC +#if 0 /* libtpms added */ +/* 10.2.5.3.6 BnPointCopy() */ +/* Function to copy a bn point. */ +LIB_EXPORT BOOL +BnPointCopy( + bigPoint pOut, + pointConst pIn + ) +{ + return BnCopy(pOut->x, pIn->x) + && BnCopy(pOut->y, pIn->y) + && BnCopy(pOut->z, pIn->z); +} +#endif /* libtpms added */ +/* 10.2.5.3.7 BnInitializePoint() */ +/* This function is used to initialize a point structure with the addresses of the coordinates. */ +LIB_EXPORT bn_point_t * +BnInitializePoint( + bigPoint p, // OUT: structure to receive pointers + bigNum x, // IN: x coordinate + bigNum y, // IN: y coordinate + bigNum z // IN: x coordinate + ) +{ + p->x = x; + p->y = y; + p->z = z; + BnSetWord(z, 1); + return p; +} +#endif // TPM_ALG_ECC |