195 lines
4.9 KiB
C
195 lines
4.9 KiB
C
/*
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* Copyright (C) 2011-2014 Andreas Steffen
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* HSR Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "pts_meas_algo.h"
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#include <utils/debug.h>
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ENUM_BEGIN(pts_meas_algorithm_names, PTS_MEAS_ALGO_NONE, PTS_MEAS_ALGO_NONE,
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"None");
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ENUM_NEXT(pts_meas_algorithm_names, PTS_MEAS_ALGO_SHA384, PTS_MEAS_ALGO_SHA384,
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PTS_MEAS_ALGO_NONE,
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"SHA384");
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ENUM_NEXT(pts_meas_algorithm_names, PTS_MEAS_ALGO_SHA256, PTS_MEAS_ALGO_SHA256,
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PTS_MEAS_ALGO_SHA384,
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"SHA256");
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ENUM_NEXT(pts_meas_algorithm_names, PTS_MEAS_ALGO_SHA1, PTS_MEAS_ALGO_SHA1,
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PTS_MEAS_ALGO_SHA256,
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"SHA1");
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ENUM_END(pts_meas_algorithm_names, PTS_MEAS_ALGO_SHA1);
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/**
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* Described in header.
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*/
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bool pts_meas_algo_probe(pts_meas_algorithms_t *algorithms)
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{
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enumerator_t *enumerator;
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hash_algorithm_t hash_alg;
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const char *plugin_name;
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char format1[] = " %s PTS measurement algorithm %N[%s] available";
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char format2[] = " %s PTS measurement algorithm %N not available";
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*algorithms = 0;
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enumerator = lib->crypto->create_hasher_enumerator(lib->crypto);
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while (enumerator->enumerate(enumerator, &hash_alg, &plugin_name))
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{
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if (hash_alg == HASH_SHA1)
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{
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*algorithms |= PTS_MEAS_ALGO_SHA1;
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DBG2(DBG_PTS, format1, "mandatory", hash_algorithm_names, hash_alg,
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plugin_name);
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}
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else if (hash_alg == HASH_SHA256)
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{
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*algorithms |= PTS_MEAS_ALGO_SHA256;
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DBG2(DBG_PTS, format1, "mandatory", hash_algorithm_names, hash_alg,
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plugin_name);
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}
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else if (hash_alg == HASH_SHA384)
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{
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*algorithms |= PTS_MEAS_ALGO_SHA384;
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DBG2(DBG_PTS, format1, "optional ", hash_algorithm_names, hash_alg,
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plugin_name);
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}
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}
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enumerator->destroy(enumerator);
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if (!(*algorithms & PTS_MEAS_ALGO_SHA384))
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{
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DBG1(DBG_PTS, format2, "optional ", hash_algorithm_names, HASH_SHA384);
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}
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if ((*algorithms & PTS_MEAS_ALGO_SHA1) &&
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(*algorithms & PTS_MEAS_ALGO_SHA256))
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{
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return TRUE;
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}
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if (!(*algorithms & PTS_MEAS_ALGO_SHA1))
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{
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DBG1(DBG_PTS, format2, "mandatory", hash_algorithm_names, HASH_SHA1);
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}
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if (!(*algorithms & PTS_MEAS_ALGO_SHA256))
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{
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DBG1(DBG_PTS, format2, "mandatory", hash_algorithm_names, HASH_SHA256);
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}
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return FALSE;
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}
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/**
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* Described in header.
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*/
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bool pts_meas_algo_update(char *hash_alg, pts_meas_algorithms_t *algorithms)
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{
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if (strcaseeq(hash_alg, "sha384") || strcaseeq(hash_alg, "sha2_384"))
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{
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/* nothing to update, all algorithms are supported */
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return TRUE;
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}
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if (strcaseeq(hash_alg, "sha256") || strcaseeq(hash_alg, "sha2_256"))
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{
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/* remove SHA384algorithm */
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*algorithms &= ~PTS_MEAS_ALGO_SHA384;
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return TRUE;
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}
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if (strcaseeq(hash_alg, "sha1"))
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{
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/* remove SHA384 and SHA256 algorithms */
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*algorithms &= ~(PTS_MEAS_ALGO_SHA384 | PTS_MEAS_ALGO_SHA256);
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return TRUE;
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}
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DBG1(DBG_PTS, "unknown hash algorithm '%s' configured", hash_alg);
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return FALSE;
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}
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/**
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* Described in header.
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*/
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pts_meas_algorithms_t pts_meas_algo_select(pts_meas_algorithms_t supported_algos,
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pts_meas_algorithms_t offered_algos)
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{
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if ((supported_algos & PTS_MEAS_ALGO_SHA384) &&
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(offered_algos & PTS_MEAS_ALGO_SHA384))
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{
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return PTS_MEAS_ALGO_SHA384;
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}
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if ((supported_algos & PTS_MEAS_ALGO_SHA256) &&
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(offered_algos & PTS_MEAS_ALGO_SHA256))
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{
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return PTS_MEAS_ALGO_SHA256;
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}
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if ((supported_algos & PTS_MEAS_ALGO_SHA1) &&
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(offered_algos & PTS_MEAS_ALGO_SHA1))
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{
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return PTS_MEAS_ALGO_SHA1;
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}
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return PTS_MEAS_ALGO_NONE;
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}
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/**
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* Described in header.
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*/
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hash_algorithm_t pts_meas_algo_to_hash(pts_meas_algorithms_t algorithm)
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{
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switch (algorithm)
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{
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case PTS_MEAS_ALGO_SHA1:
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return HASH_SHA1;
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case PTS_MEAS_ALGO_SHA256:
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return HASH_SHA256;
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case PTS_MEAS_ALGO_SHA384:
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return HASH_SHA384;
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default:
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return HASH_UNKNOWN;
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}
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}
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/**
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* Described in header.
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*/
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pts_meas_algorithms_t pts_meas_algo_from_hash(hash_algorithm_t algorithm)
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{
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switch (algorithm)
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{
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case HASH_SHA1:
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return PTS_MEAS_ALGO_SHA1;
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case HASH_SHA256:
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return PTS_MEAS_ALGO_SHA256;
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case HASH_SHA384:
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return PTS_MEAS_ALGO_SHA384;
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default:
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return PTS_MEAS_ALGO_NONE;
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}
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}
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/**
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* Described in header.
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*/
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size_t pts_meas_algo_hash_size(pts_meas_algorithms_t algorithm)
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{
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switch (algorithm)
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{
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case PTS_MEAS_ALGO_SHA1:
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return HASH_SIZE_SHA1;
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case PTS_MEAS_ALGO_SHA256:
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return HASH_SIZE_SHA256;
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case PTS_MEAS_ALGO_SHA384:
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return HASH_SIZE_SHA384;
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case PTS_MEAS_ALGO_NONE:
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default:
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return 0;
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}
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}
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