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Annotation of embedaddon/strongswan/src/libstrongswan/plugins/sha1/sha1_prf.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (C) 2008 Martin Willi
        !             3:  * HSR Hochschule fuer Technik Rapperswil
        !             4:  *
        !             5:  * This program is free software; you can redistribute it and/or modify it
        !             6:  * under the terms of the GNU General Public License as published by the
        !             7:  * Free Software Foundation; either version 2 of the License, or (at your
        !             8:  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
        !             9:  *
        !            10:  * This program is distributed in the hope that it will be useful, but
        !            11:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            12:  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
        !            13:  * for more details.
        !            14:  */
        !            15: 
        !            16: #include "sha1_prf.h"
        !            17: #include "sha1_hasher.h"
        !            18: 
        !            19: #include <library.h>
        !            20: 
        !            21: typedef struct private_sha1_prf_t private_sha1_prf_t;
        !            22: typedef struct private_sha1_hasher_t private_sha1_hasher_t;
        !            23: 
        !            24: /**
        !            25:  * Private data structure with hashing context.
        !            26:  */
        !            27: struct private_sha1_hasher_t {
        !            28:        /**
        !            29:         * Public interface for this hasher.
        !            30:         */
        !            31:        sha1_hasher_t public;
        !            32: 
        !            33:        /*
        !            34:         * State of the hasher. From sha1_hasher.c, do not change it!
        !            35:         */
        !            36:        uint32_t state[5];
        !            37:        uint32_t count[2];
        !            38:        uint8_t buffer[64];
        !            39: };
        !            40: 
        !            41: /**
        !            42:  * Private data structure with keyed prf context.
        !            43:  */
        !            44: struct private_sha1_prf_t {
        !            45: 
        !            46:        /**
        !            47:         * public prf interface
        !            48:         */
        !            49:        sha1_prf_t public;
        !            50: 
        !            51:        /**
        !            52:         * internal used hasher
        !            53:         */
        !            54:        private_sha1_hasher_t *hasher;
        !            55: };
        !            56: 
        !            57: /**
        !            58:  * From sha1_hasher.c
        !            59:  */
        !            60: extern void SHA1Update(private_sha1_hasher_t* this, uint8_t *data, uint32_t len);
        !            61: 
        !            62: METHOD(prf_t, get_bytes, bool,
        !            63:        private_sha1_prf_t *this, chunk_t seed, uint8_t *bytes)
        !            64: {
        !            65:        uint32_t *hash = (uint32_t*)bytes;
        !            66: 
        !            67:        SHA1Update(this->hasher, seed.ptr, seed.len);
        !            68: 
        !            69:        hash[0] = htonl(this->hasher->state[0]);
        !            70:        hash[1] = htonl(this->hasher->state[1]);
        !            71:        hash[2] = htonl(this->hasher->state[2]);
        !            72:        hash[3] = htonl(this->hasher->state[3]);
        !            73:        hash[4] = htonl(this->hasher->state[4]);
        !            74: 
        !            75:        return TRUE;
        !            76: }
        !            77: 
        !            78: METHOD(prf_t, get_block_size, size_t,
        !            79:        private_sha1_prf_t *this)
        !            80: {
        !            81:        return HASH_SIZE_SHA1;
        !            82: }
        !            83: 
        !            84: METHOD(prf_t, allocate_bytes, bool,
        !            85:        private_sha1_prf_t *this, chunk_t seed, chunk_t *chunk)
        !            86: {
        !            87:        *chunk = chunk_alloc(HASH_SIZE_SHA1);
        !            88:        return get_bytes(this, seed, chunk->ptr);
        !            89: }
        !            90: 
        !            91: METHOD(prf_t, get_key_size, size_t,
        !            92:        private_sha1_prf_t *this)
        !            93: {
        !            94:        return sizeof(this->hasher->state);
        !            95: }
        !            96: 
        !            97: METHOD(prf_t, set_key, bool,
        !            98:        private_sha1_prf_t *this, chunk_t key)
        !            99: {
        !           100:        int i, rounds;
        !           101:        uint32_t *iv = (uint32_t*)key.ptr;
        !           102: 
        !           103:        if (!this->hasher->public.hasher_interface.reset(
        !           104:                                                                                &this->hasher->public.hasher_interface))
        !           105:        {
        !           106:                return FALSE;
        !           107:        }
        !           108:        rounds = min(key.len/sizeof(uint32_t), sizeof(this->hasher->state));
        !           109:        for (i = 0; i < rounds; i++)
        !           110:        {
        !           111:                this->hasher->state[i] ^= htonl(iv[i]);
        !           112:        }
        !           113:        return TRUE;
        !           114: }
        !           115: 
        !           116: METHOD(prf_t, destroy, void,
        !           117:        private_sha1_prf_t *this)
        !           118: {
        !           119:        this->hasher->public.hasher_interface.destroy(&this->hasher->public.hasher_interface);
        !           120:        free(this);
        !           121: }
        !           122: 
        !           123: /**
        !           124:  * see header
        !           125:  */
        !           126: sha1_prf_t *sha1_prf_create(pseudo_random_function_t algo)
        !           127: {
        !           128:        private_sha1_prf_t *this;
        !           129: 
        !           130:        if (algo != PRF_KEYED_SHA1)
        !           131:        {
        !           132:                return NULL;
        !           133:        }
        !           134: 
        !           135:        INIT(this,
        !           136:                .public = {
        !           137:                        .prf_interface = {
        !           138:                                .get_bytes = _get_bytes,
        !           139:                                .allocate_bytes = _allocate_bytes,
        !           140:                                .get_block_size = _get_block_size,
        !           141:                                .get_key_size = _get_key_size,
        !           142:                                .set_key = _set_key,
        !           143:                                .destroy = _destroy,
        !           144:                        },
        !           145:                },
        !           146:                .hasher = (private_sha1_hasher_t*)sha1_hasher_create(HASH_SHA1),
        !           147:        );
        !           148: 
        !           149:        return &this->public;
        !           150: }