diff options
Diffstat (limited to 'src/libstrongswan/plugins/ntru/ntru_mgf1.c')
| -rw-r--r-- | src/libstrongswan/plugins/ntru/ntru_mgf1.c | 182 |
1 files changed, 0 insertions, 182 deletions
diff --git a/src/libstrongswan/plugins/ntru/ntru_mgf1.c b/src/libstrongswan/plugins/ntru/ntru_mgf1.c deleted file mode 100644 index 2338db208..000000000 --- a/src/libstrongswan/plugins/ntru/ntru_mgf1.c +++ /dev/null @@ -1,182 +0,0 @@ -/* - * Copyright (C) 2013 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 "ntru_mgf1.h" - -#include <crypto/hashers/hasher.h> -#include <utils/debug.h> -#include <utils/test.h> - -typedef struct private_ntru_mgf1_t private_ntru_mgf1_t; - -/** - * Private data of an ntru_mgf1_t object. - */ -struct private_ntru_mgf1_t { - - /** - * Public ntru_mgf1_t interface. - */ - ntru_mgf1_t public; - - /** - * Hasher the MGF1 Mask Generation Function is based on - */ - hasher_t *hasher; - - /** - * Counter - */ - u_int32_t counter; - - /** - * Set if counter has reached 2^32 - */ - bool overflow; - - /** - * Current state to be hashed - */ - chunk_t state; - - /** - * Position of the 4 octet counter string - */ - u_char *ctr_str; - -}; - -METHOD(ntru_mgf1_t, get_hash_size, size_t, - private_ntru_mgf1_t *this) -{ - return this->hasher->get_hash_size(this->hasher); -} - -METHOD(ntru_mgf1_t, get_mask, bool, - private_ntru_mgf1_t *this, size_t mask_len, u_char *mask) -{ - u_char buf[HASH_SIZE_SHA512]; - size_t hash_len; - - hash_len = this->hasher->get_hash_size(this->hasher); - - while (mask_len > 0) - { - /* detect overflow, set counter string and increment counter */ - if (this->overflow) - { - return FALSE; - } - htoun32(this->ctr_str, this->counter++); - if (this->counter == 0) - { - this->overflow = TRUE; - } - - /* get the next or final mask block from the hash function */ - if (!this->hasher->get_hash(this->hasher, this->state, - (mask_len < hash_len) ? buf : mask)) - { - return FALSE; - } - if (mask_len < hash_len) - { - memcpy(mask, buf, mask_len); - return TRUE; - } - mask_len -= hash_len; - mask += hash_len; - } - return TRUE; -} - -METHOD(ntru_mgf1_t, allocate_mask, bool, - private_ntru_mgf1_t *this, size_t mask_len, chunk_t *mask) -{ - if (mask_len == 0) - { - *mask = chunk_empty; - return TRUE; - } - *mask = chunk_alloc(mask_len); - - return get_mask(this, mask_len, mask->ptr); -} - -METHOD(ntru_mgf1_t, destroy, void, - private_ntru_mgf1_t *this) -{ - this->hasher->destroy(this->hasher); - chunk_clear(&this->state); - free(this); -} - -/* - * Described in header. - */ -ntru_mgf1_t *ntru_mgf1_create(hash_algorithm_t alg, chunk_t seed, - bool hash_seed) -{ - private_ntru_mgf1_t *this; - hasher_t *hasher; - size_t state_len; - - if (seed.len == 0) - { - DBG1(DBG_LIB, "empty seed for MGF1"); - return NULL; - } - - hasher = lib->crypto->create_hasher(lib->crypto, alg); - if (!hasher) - { - DBG1(DBG_LIB, "failed to create %N hasher for MGF1", - hash_algorithm_names, alg); - return NULL; - } - state_len = (hash_seed ? hasher->get_hash_size(hasher) : seed.len) + 4; - - INIT(this, - .public = { - .get_hash_size = _get_hash_size, - .allocate_mask = _allocate_mask, - .get_mask = _get_mask, - .destroy = _destroy, - }, - .hasher = hasher, - .state = chunk_alloc(state_len), - ); - - /* determine position of the 4 octet counter string */ - this->ctr_str = this->state.ptr + state_len - 4; - - if (hash_seed) - { - if (!hasher->get_hash(hasher, seed, this->state.ptr)) - { - DBG1(DBG_LIB, "failed to hash seed for MGF1"); - destroy(this); - return NULL; - } - } - else - { - memcpy(this->state.ptr, seed.ptr, seed.len); - } - - return &this->public; -} - -EXPORT_FUNCTION_FOR_TESTS(ntru, ntru_mgf1_create); |