153 lines
3.7 KiB
C
153 lines
3.7 KiB
C
/*
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* Copyright (C) 2008 Martin Willi
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* 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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* $Id$
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*/
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#include "sha1_prf.h"
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#include "sha1_hasher.h"
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#include <arpa/inet.h>
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typedef struct private_sha1_prf_t private_sha1_prf_t;
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typedef struct private_sha1_hasher_t private_sha1_hasher_t;
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/**
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* Private data structure with hasing context.
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*/
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struct private_sha1_hasher_t {
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/**
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* Public interface for this hasher.
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*/
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sha1_hasher_t public;
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/*
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* State of the hasher. From sha1_hasher.c, do not change it!
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*/
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u_int32_t state[5];
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u_int32_t count[2];
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u_int8_t buffer[64];
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};
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/**
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* Private data structure with keyed prf context.
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*/
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struct private_sha1_prf_t {
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/**
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* public prf interface
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*/
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sha1_prf_t public;
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/**
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* internal used hasher
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*/
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private_sha1_hasher_t *hasher;
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};
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/**
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* From sha1_hasher.c
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*/
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extern void SHA1Update(private_sha1_hasher_t* this, u_int8_t *data, u_int32_t len);
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/**
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* Implementation of prf_t.get_bytes.
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*/
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static void get_bytes(private_sha1_prf_t *this, chunk_t seed, u_int8_t *bytes)
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{
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u_int32_t *hash = (u_int32_t*)bytes;
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SHA1Update(this->hasher, seed.ptr, seed.len);
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hash[0] = htonl(this->hasher->state[0]);
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hash[1] = htonl(this->hasher->state[1]);
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hash[2] = htonl(this->hasher->state[2]);
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hash[3] = htonl(this->hasher->state[3]);
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hash[4] = htonl(this->hasher->state[4]);
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}
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/**
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* Implementation of prf_t.get_block_size.
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*/
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static size_t get_block_size(private_sha1_prf_t *this)
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{
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return HASH_SIZE_SHA1;
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}
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/**
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* Implementation of prf_t.allocate_bytes.
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*/
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static void allocate_bytes(private_sha1_prf_t *this, chunk_t seed, chunk_t *chunk)
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{
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*chunk = chunk_alloc(HASH_SIZE_SHA1);
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get_bytes(this, seed, chunk->ptr);
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}
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/**
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* Implementation of prf_t.get_key_size.
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*/
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static size_t get_key_size(private_sha1_prf_t *this)
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{
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return sizeof(this->hasher->state);
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}
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/**
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* Implementation of prf_t.set_key.
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*/
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static void set_key(private_sha1_prf_t *this, chunk_t key)
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{
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int i, rounds;
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u_int32_t *iv = (u_int32_t*)key.ptr;
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this->hasher->public.hasher_interface.reset(&this->hasher->public.hasher_interface);
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rounds = min(key.len/sizeof(u_int32_t), sizeof(this->hasher->state));
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for (i = 0; i < rounds; i++)
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{
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this->hasher->state[i] ^= htonl(iv[i]);
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}
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}
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/**
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* Implementation of prf_t.destroy.
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*/
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static void destroy(private_sha1_prf_t *this)
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{
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this->hasher->public.hasher_interface.destroy(&this->hasher->public.hasher_interface);
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free(this);
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}
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/**
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* see header
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*/
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sha1_prf_t *sha1_prf_create(pseudo_random_function_t algo)
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{
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private_sha1_prf_t *this;
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if (algo != PRF_KEYED_SHA1)
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{
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return NULL;
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}
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this = malloc_thing(private_sha1_prf_t);
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this->public.prf_interface.get_bytes = (void (*) (prf_t *,chunk_t,u_int8_t*))get_bytes;
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this->public.prf_interface.allocate_bytes = (void (*) (prf_t*,chunk_t,chunk_t*))allocate_bytes;
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this->public.prf_interface.get_block_size = (size_t (*) (prf_t*))get_block_size;
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this->public.prf_interface.get_key_size = (size_t (*) (prf_t*))get_key_size;
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this->public.prf_interface.set_key = (void (*) (prf_t *,chunk_t))set_key;
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this->public.prf_interface.destroy = (void (*) (prf_t *))destroy;
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this->hasher = (private_sha1_hasher_t*)sha1_hasher_create(HASH_SHA1);
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return &this->public;
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}
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