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[avr-crypto-lib.git] / shabea.c

diff --git a/shabea.c b/shabea.c
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-/* shabea.c */
-/*
- *   This file is part of AnonAccess, an access system which can be used
- *    to open door or doing other things with an anonymity featured
- *    account managment.
- *   Copyright (C) 2006, 2007, 2008  Daniel Otte (daniel.otte@rub.de)
- *
- *   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 3 of the License, or
- *   (at your option) any later version.
- *
- *   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.
- *
- *   You should have received a copy of the GNU General Public License
- *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-/**
- * \file       shabea.c
- * \author     Daniel Otte 
- * \date       2007-06-07
- * \brief      SHABEA - a SHA Based Encryption Algorithm implementation
- * \par License        
- * GPL
- * 
- * SHABEAn-r where n is the blocksize and r the number of round used
- * 
- * 
- */
-#include <stdlib.h>
-#include <string.h>
-#include "sha256.h"
-
-#include "config.h"
-#include "memxor.h"
-
-
-/*
- * SHABEA256-n
- */ 
- 
-#define SHABEA_BLOCKSIZE 256
-#define SHABEA_BLOCKSIZEB (SHABEA_BLOCKSIZE/8)
-#define SHABEA_HALFSIZEB  (SHABEA_BLOCKSIZEB/2)
-#define SHABEA_HALFSIZE (SHABEA_BLOCKSIZE/2)
-
-#define L ((uint8_t*)block+ 0)
-#define R ((uint8_t*)block+16)
-void shabea256(void * block, void * key, uint16_t keysize_b, uint8_t enc, uint8_t rounds){
-       uint8_t r;              /**/
-       uint8_t tb[SHABEA_HALFSIZEB+2+(keysize_b+7)/8]; /**/
-       uint16_t kbs;   /* bytes used for the key / temporary block */
-       sha256_hash_t hash;
-       uint8_t termcond; 
-       int8_t dir;
-       if(enc){
-               r = 0;
-               termcond = rounds-1;
-               dir = 1;
-       } else {
-               r = rounds-1;
-               termcond = 0;
-               dir = -1;
-       }
-       kbs = (keysize_b+7)/8;
-       memcpy(tb+SHABEA_HALFSIZEB+2, key, kbs); /* copy key to temporary block */
-       tb[SHABEA_HALFSIZEB+0] = 0;     /* set round counter high value to zero */
-       
-       for(;;r+=dir){ /* enc: 0..(rounds-1) ; !enc: (rounds-1)..0 */
-               memcpy(tb, R, SHABEA_HALFSIZEB); /* copy right half into tb */
-               tb[SHABEA_HALFSIZEB+1] = r;
-               sha256(&hash, tb, SHABEA_HALFSIZE+16+keysize_b);
-               if(r!=termcond){        
-                       /* swap */
-                       memxor(hash, L, SHABEA_HALFSIZEB);
-                       memcpy(L, R, SHABEA_HALFSIZEB);
-                       memcpy(R, hash, SHABEA_HALFSIZEB);
-               } else {
-                       /* last round */
-                       /* no swap */
-                       memxor(L, hash, SHABEA_HALFSIZEB);
-                       return; 
-               }
-       }
-}
-
-