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diff --git a/src/tpm2/crypto/openssl/ConsttimeUtils.h b/src/tpm2/crypto/openssl/ConsttimeUtils.h
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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 */