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/********************************************************************************/
/* */
/* Nonce Handler */
/* Written by Ken Goldman */
/* IBM Thomas J. Watson Research Center */
/* $Id: tpm_nonce.c 4071 2010-04-29 19:26:45Z kgoldman $ */
/* */
/* (c) Copyright IBM Corporation 2006, 2010. */
/* */
/* All rights reserved. */
/* */
/* Redistribution and use in source and binary forms, with or without */
/* modification, are permitted provided that the following conditions are */
/* met: */
/* */
/* Redistributions of source code must retain the above copyright notice, */
/* this list of conditions and the following disclaimer. */
/* */
/* Redistributions in binary form must reproduce the above copyright */
/* notice, this list of conditions and the following disclaimer in the */
/* documentation and/or other materials provided with the distribution. */
/* */
/* Neither the names of the IBM Corporation nor the names of its */
/* contributors may be used to endorse or promote products derived from */
/* this software without specific prior written permission. */
/* */
/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS */
/* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT */
/* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR */
/* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT */
/* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT */
/* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, */
/* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY */
/* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT */
/* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE */
/* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/********************************************************************************/
#include <stdio.h>
#include <string.h>
#include "tpm_crypto.h"
#include "tpm_debug.h"
#include "tpm_error.h"
#include "tpm_structures.h"
#include "tpm_nonce.h"
/* TPM_Nonce_Init resets a nonce structure to zeros */
void TPM_Nonce_Init(TPM_NONCE tpm_nonce)
{
size_t i;
printf(" TPM_Nonce_Init:\n");
for (i = 0 ; i < TPM_NONCE_SIZE ; i++) {
tpm_nonce[i] = 0;
}
return;
}
/* TPM_Nonce_Load()
deserialize the structure from a 'stream'
'stream_size' is checked for sufficient data
returns 0 or error codes
*/
TPM_RESULT TPM_Nonce_Load(TPM_NONCE tpm_nonce,
unsigned char **stream,
uint32_t *stream_size)
{
TPM_RESULT rc = 0;
printf(" TPM_Nonce_Load:\n");
rc = TPM_Loadn(tpm_nonce, TPM_NONCE_SIZE, stream, stream_size);
return rc;
}
/* TPM_Nonce_Store()
serialize the structure to a stream contained in 'sbuffer'
returns 0 or error codes
After use, call TPM_Sbuffer_Delete() to free memory
*/
TPM_RESULT TPM_Nonce_Store(TPM_STORE_BUFFER *sbuffer,
const TPM_NONCE tpm_nonce)
{
TPM_RESULT rc = 0;
printf(" TPM_Nonce_Store:\n");
rc = TPM_Sbuffer_Append(sbuffer, tpm_nonce, TPM_NONCE_SIZE);
return rc;
}
/* TPM_Nonce_Copy() copies the source to the destination
*/
void TPM_Nonce_Copy(TPM_NONCE destination, const TPM_NONCE source)
{
printf(" TPM_Nonce_Copy:\n");
memcpy(destination, source, TPM_NONCE_SIZE);
return;
}
/* TPM_Nonce_Compare() compares the source to the destination.
Returns TPM_AUTHFAIL if the nonces are not equal
*/
TPM_RESULT TPM_Nonce_Compare(TPM_NONCE expect, const TPM_NONCE actual)
{
TPM_RESULT rc = 0;
printf(" TPM_Nonce_Compare:\n");
rc = memcmp(expect, actual, TPM_NONCE_SIZE);
if (rc != 0) {
printf("TPM_Nonce_Compare: Error comparing nonce\n");
TPM_PrintFour(" TPM_Nonce_Compare: Expect", expect);
TPM_PrintFour(" TPM_Nonce_Compare: Actual", actual);
rc = TPM_AUTHFAIL;
}
return rc;
}
/* TPM_Nonce_Generate() generates a new nonce from the random number generator
*/
TPM_RESULT TPM_Nonce_Generate(TPM_NONCE tpm_nonce)
{
TPM_RESULT rc = 0;
printf(" TPM_Nonce_Generate:\n");
rc = TPM_Random(tpm_nonce, TPM_NONCE_SIZE);
return rc;
}
/* TPM_Nonce_IsZero() returns 'isZero' TRUE is all bytes 'tpm_nonce' are 0x00
*/
void TPM_Nonce_IsZero(TPM_BOOL *isZero, TPM_NONCE tpm_nonce)
{
size_t i;
printf(" TPM_Nonce_IsZero:\n");
for (i = 0, *isZero = TRUE ; (i < TPM_NONCE_SIZE) && *isZero ; i++) {
if (tpm_nonce[i] != 0) {
*isZero = FALSE;
}
}
return;
}
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