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/*
* Copyright (C) 2008 Martin Willi
* 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 "sha1_prf.h"
#include "sha1_hasher.h"
#include <library.h>
typedef struct private_sha1_prf_t private_sha1_prf_t;
typedef struct private_sha1_hasher_t private_sha1_hasher_t;
/**
* Private data structure with hasing context.
*/
struct private_sha1_hasher_t {
/**
* Public interface for this hasher.
*/
sha1_hasher_t public;
/*
* State of the hasher. From sha1_hasher.c, do not change it!
*/
uint32_t state[5];
uint32_t count[2];
uint8_t buffer[64];
};
/**
* Private data structure with keyed prf context.
*/
struct private_sha1_prf_t {
/**
* public prf interface
*/
sha1_prf_t public;
/**
* internal used hasher
*/
private_sha1_hasher_t *hasher;
};
/**
* From sha1_hasher.c
*/
extern void SHA1Update(private_sha1_hasher_t* this, uint8_t *data, uint32_t len);
METHOD(prf_t, get_bytes, bool,
private_sha1_prf_t *this, chunk_t seed, uint8_t *bytes)
{
uint32_t *hash = (uint32_t*)bytes;
SHA1Update(this->hasher, seed.ptr, seed.len);
hash[0] = htonl(this->hasher->state[0]);
hash[1] = htonl(this->hasher->state[1]);
hash[2] = htonl(this->hasher->state[2]);
hash[3] = htonl(this->hasher->state[3]);
hash[4] = htonl(this->hasher->state[4]);
return TRUE;
}
METHOD(prf_t, get_block_size, size_t,
private_sha1_prf_t *this)
{
return HASH_SIZE_SHA1;
}
METHOD(prf_t, allocate_bytes, bool,
private_sha1_prf_t *this, chunk_t seed, chunk_t *chunk)
{
*chunk = chunk_alloc(HASH_SIZE_SHA1);
return get_bytes(this, seed, chunk->ptr);
}
METHOD(prf_t, get_key_size, size_t,
private_sha1_prf_t *this)
{
return sizeof(this->hasher->state);
}
METHOD(prf_t, set_key, bool,
private_sha1_prf_t *this, chunk_t key)
{
int i, rounds;
uint32_t *iv = (uint32_t*)key.ptr;
if (!this->hasher->public.hasher_interface.reset(
&this->hasher->public.hasher_interface))
{
return FALSE;
}
rounds = min(key.len/sizeof(uint32_t), sizeof(this->hasher->state));
for (i = 0; i < rounds; i++)
{
this->hasher->state[i] ^= htonl(iv[i]);
}
return TRUE;
}
METHOD(prf_t, destroy, void,
private_sha1_prf_t *this)
{
this->hasher->public.hasher_interface.destroy(&this->hasher->public.hasher_interface);
free(this);
}
/**
* see header
*/
sha1_prf_t *sha1_prf_create(pseudo_random_function_t algo)
{
private_sha1_prf_t *this;
if (algo != PRF_KEYED_SHA1)
{
return NULL;
}
INIT(this,
.public = {
.prf_interface = {
.get_bytes = _get_bytes,
.allocate_bytes = _allocate_bytes,
.get_block_size = _get_block_size,
.get_key_size = _get_key_size,
.set_key = _set_key,
.destroy = _destroy,
},
},
.hasher = (private_sha1_hasher_t*)sha1_hasher_create(HASH_SHA1),
);
return &this->public;
}
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