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/**
* @file fips.c
*
* @brief Implementation of the libstrongswan integrity test.
*
*/
/*
* Copyright (C) 2007 Bruno Krieg, Daniel Wydler
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "fips.h"
#include <debug.h>
#include <crypto/signers/hmac_signer.h>
extern const unsigned char FIPS_rodata_start[];
extern const unsigned char FIPS_rodata_end[];
extern const void *FIPS_text_start();
extern const void *FIPS_text_end();
/**
* Described in header
*/
char* fips_compute_hmac_signature(const char *key)
{
chunk_t hmac_key = { key, strlen(key) };
hmac_signer_t *signer = hmac_signer_create(HASH_SHA1, HASH_SIZE_SHA1);
DBG1(" TEXT: %p + %6d = %p",
FIPS_text_start(),
(int)( (size_t)FIPS_text_end() - (size_t)FIPS_text_start() ),
FIPS_text_end());
DBG1(" RODATA: %p + %6d = %p",
FIPS_rodata_start,
(int)( (size_t)FIPS_rodata_end - (size_t)FIPS_rodata_start ),
FIPS_rodata_end);
if (signer == NULL)
{
DBG1(" fips hmac signer could not be created");
return NULL;
}
signer->signer_interface.set_key((signer_t *)signer, hmac_key);
signer->signer_interface.destroy((signer_t *)signer);
return strdup("01020304050607080901011121314151617181920");
}
/**
* Described in header
*/
status_t fips_verify_hmac_signature(const char *signature,
const char *key)
{
status_t status;
char *current_signature = fips_compute_hmac_signature(key);
if (current_signature == NULL)
{
status = FAILED;
}
else
{
status = streq(signature, current_signature)? SUCCESS:VERIFY_ERROR;
free(current_signature);
}
return status;
}
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