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/********************************************************************************/
/* */
/* */
/* 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
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