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/********************************************************************************/
/* */
/* Constant time debugging helper functions */
/* Written by Stefan Berger */
/* IBM Thomas J. Watson Research Center */
/* */
/* 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, 2020 */
/* */
/********************************************************************************/
#ifndef CONSTTIME_UTILS_H
#define CONSTTIME_UTILS_H
#include <assert.h>
#include <stdio.h>
#include "BnValues.h"
#include <openssl/bn.h>
static __inline__ unsigned long long rdtsc() {
unsigned long h, l;
__asm__ __volatile__ ("rdtsc" : "=a"(l), "=d"(h));
return (unsigned long long)l |
((unsigned long long)h << 32 );
}
// Make sure that the given BIGNUM has the given number of expected bytes.
// Skip over any leading zeros the BIGNUM may have.
static inline void assert_ossl_num_bytes(const BIGNUM *a,
unsigned int num_bytes,
int verbose,
const char *caller) {
unsigned char buffer[LARGEST_NUMBER] = { 0, };
int len, i;
len = BN_bn2bin(a, buffer);
for (i = 0; i < len; i++) {
if (buffer[i])
break;
}
len -= i;
if (num_bytes != (unsigned int)len) {
printf("%s: Expected %u bytes but found %d (caller: %s)\n", __func__, num_bytes, len, caller);
} else {
if (verbose)
printf("%s: check passed; num_bytes = %d (caller: %s)\n",__func__, num_bytes, caller);
}
assert(num_bytes == (unsigned int)len);
}
// Make sure that the bigNum has the expected number of bytes after it was
// converted to an OpenSSL BIGNUM.
static inline void assert_bn_ossl_num_bytes(bigNum tpmb,
unsigned int num_bytes,
int verbose,
const char *caller) {
BIG_INITIALIZED(osslb, tpmb);
assert_ossl_num_bytes(osslb, num_bytes, verbose, caller);
BN_free(osslb);
}
#endif /* CONSTTIME_UTILS_H */
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