144 lines
2.7 KiB
C
144 lines
2.7 KiB
C
/*
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* Copyright (C) 2010 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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#include "openssl_sha1_prf.h"
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#include <openssl/sha.h>
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typedef struct private_openssl_sha1_prf_t private_openssl_sha1_prf_t;
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/**
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* Private data of an openssl_sha1_prf_t object.
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*/
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struct private_openssl_sha1_prf_t {
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/**
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* Public openssl_sha1_prf_t interface.
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*/
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openssl_sha1_prf_t public;
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/**
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* SHA1 context
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*/
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SHA_CTX ctx;
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};
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METHOD(prf_t, get_bytes, bool,
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private_openssl_sha1_prf_t *this, chunk_t seed, u_int8_t *bytes)
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{
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SHA1_Update(&this->ctx, seed.ptr, seed.len);
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if (bytes)
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{
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u_int32_t *hash = (u_int32_t*)bytes;
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hash[0] = htonl(this->ctx.h0);
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hash[1] = htonl(this->ctx.h1);
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hash[2] = htonl(this->ctx.h2);
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hash[3] = htonl(this->ctx.h3);
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hash[4] = htonl(this->ctx.h4);
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}
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return TRUE;
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}
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METHOD(prf_t, get_block_size, size_t,
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private_openssl_sha1_prf_t *this)
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{
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return HASH_SIZE_SHA1;
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}
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METHOD(prf_t, allocate_bytes, void,
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private_openssl_sha1_prf_t *this, chunk_t seed, chunk_t *chunk)
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{
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if (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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else
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{
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get_bytes(this, seed, NULL);
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}
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}
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METHOD(prf_t, get_key_size, size_t,
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private_openssl_sha1_prf_t *this)
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{
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return HASH_SIZE_SHA1;
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}
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METHOD(prf_t, set_key, void,
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private_openssl_sha1_prf_t *this, chunk_t key)
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{
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SHA1_Init(&this->ctx);
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if (key.len >= 4)
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{
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this->ctx.h0 ^= untoh32(key.ptr);
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}
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if (key.len >= 8)
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{
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this->ctx.h1 ^= untoh32(key.ptr + 4);
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}
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if (key.len >= 12)
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{
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this->ctx.h2 ^= untoh32(key.ptr + 8);
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}
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if (key.len >= 16)
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{
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this->ctx.h3 ^= untoh32(key.ptr + 12);
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}
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if (key.len >= 20)
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{
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this->ctx.h4 ^= untoh32(key.ptr + 16);
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}
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}
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METHOD(prf_t, destroy, void,
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private_openssl_sha1_prf_t *this)
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{
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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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openssl_sha1_prf_t *openssl_sha1_prf_create(pseudo_random_function_t algo)
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{
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private_openssl_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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INIT(this,
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.public = {
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.prf = {
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.get_block_size = _get_block_size,
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.get_bytes = _get_bytes,
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.allocate_bytes = _allocate_bytes,
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.get_key_size = _get_key_size,
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.set_key = _set_key,
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.destroy = _destroy,
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},
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},
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);
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return &this->public;
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}
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