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/********************************************************************************/
/* */
/* TPM to OpenSSL BigNum Shim Layer */
/* Written by Ken Goldman */
/* IBM Thomas J. Watson Research Center */
/* $Id: TpmToOsslMath.h 1658 2021-01-22 23:14:01Z 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 - 2021 */
/* */
/********************************************************************************/
/* B.2.2.1. TpmToOsslMath.h */
/* B.2.2.1.1. Introduction */
/* This file contains the structure definitions used for ECC in the OpenSSL version of the
code. These definitions would change, based on the library. The ECC-related structures that cross
the TPM interface are defined in TpmTypes.h */
#ifndef MATH_LIB_DEFINED
#define MATH_LIB_DEFINED
#define MATH_LIB_OSSL
#include <openssl/evp.h>
#include <openssl/ec.h>
#define SYMMETRIC_ALIGNMENT RADIX_BYTES
#if 0 // libtpms added
#if OPENSSL_VERSION_NUMBER >= 0x10200000L
// Check the bignum_st definition in crypto/bn/bn_lcl.h and either update the
// version check or provide the new definition for this version.
# error Untested OpenSSL version
#elif OPENSSL_VERSION_NUMBER >= 0x10100000L
// from crypto/bn/bn_lcl.h
struct bignum_st {
BN_ULONG *d;
int top;
int dmax;
int neg;
int flags;
};
#if 0 // libtpms added
# define EC_POINT_get_affine_coordinates EC_POINT_get_affine_coordinates_GFp
# define EC_POINT_set_affine_coordinates EC_POINT_set_affine_coordinates_GFp
#endif // libtpms added
#endif // OPENSSL_VERSION_NUMBER
#endif // libtpms added
#include <openssl/bn.h>
#if USE_OPENSSL_FUNCTIONS_ECDSA // libtpms added begin
#include <openssl/ecdsa.h>
#endif // libtpms added end
/* B.2.2.2.2. Macros and Defines */
/* Make sure that the library is using the correct size for a crypt word */
#if defined THIRTY_TWO_BIT && (RADIX_BITS != 32) \
|| ((defined SIXTY_FOUR_BIT_LONG || defined SIXTY_FOUR_BIT) \
&& (RADIX_BITS != 64))
# error Ossl library is using different radix
#endif
/* Allocate a local BIGNUM value. For the allocation, a bigNum structure is created as is a local
BIGNUM. The bigNum is initialized and then the BIGNUM is set to reference the local value. */
#define BIG_VAR(name, bits) \
BN_VAR(name##Bn, (bits)); \
BIGNUM *_##name = BN_new(); /* libtpms */ \
BIGNUM *name = BigInitialized(_##name, /* libtpms */ \
BnInit(name##Bn, \
BYTES_TO_CRYPT_WORDS(sizeof(_##name##Bn.d))))
/* Allocate a BIGNUM and initialize with the values in a bigNum initializer */
#define BIG_INITIALIZED(name, initializer) \
BIGNUM *_##name = BN_new(); /* libtpms */ \
BIGNUM *name = BigInitialized(_##name, initializer) /* libtpms */
typedef struct
{
const ECC_CURVE_DATA *C; // the TPM curve values
EC_GROUP *G; // group parameters
BN_CTX *CTX; // the context for the math (this might not be
// the context in which the curve was created>;
} OSSL_CURVE_DATA;
typedef OSSL_CURVE_DATA *bigCurve;
#define AccessCurveData(E) ((E)->C)
#include "TpmToOsslSupport_fp.h"
#define OSSL_ENTER() BN_CTX *CTX = OsslContextEnter()
#define OSSL_LEAVE() OsslContextLeave(CTX)
/* Start and end a context that spans multiple ECC functions. This is used so that the group for the
curve can persist across multiple frames. */
#define CURVE_INITIALIZED(name, initializer) \
OSSL_CURVE_DATA _##name; \
bigCurve name = BnCurveInitialize(&_##name, initializer)
#define CURVE_FREE(name) BnCurveFree(name)
/* Start and end a local stack frame within the context of the curve frame */
#if 0 /* kgold not used */
#define ECC_ENTER() BN_CTX *CTX = OsslPushContext(E->CTX)
#define ECC_LEAVE() OsslPopContext(CTX)
#endif
#define BN_NEW() BnNewVariable(CTX)
/* This definition would change if there were something to report */
#define MathLibSimulationEnd()
#endif // MATH_LIB_DEFINED
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