diff options
Diffstat (limited to 'src/libpts/pts/pts_meas_algo.c')
| -rw-r--r-- | src/libpts/pts/pts_meas_algo.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/src/libpts/pts/pts_meas_algo.c b/src/libpts/pts/pts_meas_algo.c new file mode 100644 index 000000000..865857d3c --- /dev/null +++ b/src/libpts/pts/pts_meas_algo.c @@ -0,0 +1,170 @@ +/* + * 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; + } +} + |