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/*
* Copyright (C) 2011 Andreas Steffen
* HSR 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 "pts_meas_algo.h"
#include <debug.h>
ENUM(pts_meas_algorithm_names, PTS_MEAS_ALGO_NONE, PTS_MEAS_ALGO_SHA384,
"None",
"SHA1",
"SHA256",
"SHA384"
);
/**
* Described in header.
*/
bool pts_meas_algo_probe(pts_meas_algorithms_t *algorithms)
{
enumerator_t *enumerator;
hash_algorithm_t hash_alg;
const char *plugin_name;
char format1[] = " %s PTS measurement algorithm %N[%s] available";
char format2[] = " %s PTS measurement algorithm %N not available";
*algorithms = 0;
enumerator = lib->crypto->create_hasher_enumerator(lib->crypto);
while (enumerator->enumerate(enumerator, &hash_alg, &plugin_name))
{
if (hash_alg == HASH_SHA1)
{
*algorithms |= PTS_MEAS_ALGO_SHA1;
DBG2(DBG_PTS, format1, "mandatory", hash_algorithm_names, hash_alg,
plugin_name);
}
else if (hash_alg == HASH_SHA256)
{
*algorithms |= PTS_MEAS_ALGO_SHA256;
DBG2(DBG_PTS, format1, "mandatory", hash_algorithm_names, hash_alg,
plugin_name);
}
else if (hash_alg == HASH_SHA384)
{
*algorithms |= PTS_MEAS_ALGO_SHA384;
DBG2(DBG_PTS, format1, "optional ", hash_algorithm_names, hash_alg,
plugin_name);
}
}
enumerator->destroy(enumerator);
if (!(*algorithms & PTS_MEAS_ALGO_SHA384))
{
DBG1(DBG_PTS, format2, "optional ", hash_algorithm_names, HASH_SHA384);
}
if ((*algorithms & PTS_MEAS_ALGO_SHA1) &&
(*algorithms & PTS_MEAS_ALGO_SHA256))
{
return TRUE;
}
if (!(*algorithms & PTS_MEAS_ALGO_SHA1))
{
DBG1(DBG_PTS, format2, "mandatory", hash_algorithm_names, HASH_SHA1);
}
if (!(*algorithms & PTS_MEAS_ALGO_SHA256))
{
DBG1(DBG_PTS, format2, "mandatory", hash_algorithm_names, HASH_SHA256);
}
return FALSE;
}
/**
* Described in header.
*/
bool pts_meas_algo_update(char *hash_alg, pts_meas_algorithms_t *algorithms)
{
if (strcaseeq(hash_alg, "sha384") || strcaseeq(hash_alg, "sha2_384"))
{
/* nothing to update, all algorithms are supported */
return TRUE;
}
if (strcaseeq(hash_alg, "sha256") || strcaseeq(hash_alg, "sha2_256"))
{
/* remove SHA384algorithm */
*algorithms &= ~PTS_MEAS_ALGO_SHA384;
return TRUE;
}
if (strcaseeq(hash_alg, "sha1"))
{
/* remove SHA384 and SHA256 algorithms */
*algorithms &= ~(PTS_MEAS_ALGO_SHA384 | PTS_MEAS_ALGO_SHA256);
return TRUE;
}
DBG1(DBG_PTS, "unknown hash algorithm '%s' configured", hash_alg);
return FALSE;
}
/**
* Described in header.
*/
pts_meas_algorithms_t pts_meas_algo_select(pts_meas_algorithms_t supported_algos,
pts_meas_algorithms_t offered_algos)
{
if ((supported_algos & PTS_MEAS_ALGO_SHA384) &&
(offered_algos & PTS_MEAS_ALGO_SHA384))
{
return PTS_MEAS_ALGO_SHA384;
}
if ((supported_algos & PTS_MEAS_ALGO_SHA256) &&
(offered_algos & PTS_MEAS_ALGO_SHA256))
{
return PTS_MEAS_ALGO_SHA256;
}
if ((supported_algos & PTS_MEAS_ALGO_SHA1) &&
(offered_algos & PTS_MEAS_ALGO_SHA1))
{
return PTS_MEAS_ALGO_SHA1;
}
return PTS_MEAS_ALGO_NONE;
}
/**
* Described in header.
*/
hash_algorithm_t pts_meas_algo_to_hash(pts_meas_algorithms_t algorithm)
{
switch (algorithm)
{
case PTS_MEAS_ALGO_SHA1:
return HASH_SHA1;
case PTS_MEAS_ALGO_SHA256:
return HASH_SHA256;
case PTS_MEAS_ALGO_SHA384:
return HASH_SHA384;
default:
return HASH_UNKNOWN;
}
}
/**
* Described in header.
*/
size_t pts_meas_algo_hash_size(pts_meas_algorithms_t algorithm)
{
switch (algorithm)
{
case PTS_MEAS_ALGO_SHA1:
return HASH_SIZE_SHA1;
case PTS_MEAS_ALGO_SHA256:
return HASH_SIZE_SHA256;
case PTS_MEAS_ALGO_SHA384:
return HASH_SIZE_SHA384;
case PTS_MEAS_ALGO_NONE:
default:
return 0;
}
}
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