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Diffstat (limited to '')
| -rw-r--r-- | src/tpm2/crypto/openssl/ConsttimeUtils.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/src/tpm2/crypto/openssl/ConsttimeUtils.h b/src/tpm2/crypto/openssl/ConsttimeUtils.h new file mode 100644 index 0000000..3364bee --- /dev/null +++ b/src/tpm2/crypto/openssl/ConsttimeUtils.h @@ -0,0 +1,117 @@ +/********************************************************************************/ +/* */ +/* 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 */ |