From 71a4c5f0a397c8a34211ca269356198a0e91da17 Mon Sep 17 00:00:00 2001 From: bg Date: Sun, 21 Sep 2008 21:22:23 +0000 Subject: [PATCH] --- memxor.S | 3 -- shabea.c | 84 ++++++++++++++++++++++++++++++++------------------------ shabea.h | 48 ++++++++++++++------------------ 3 files changed, 69 insertions(+), 66 deletions(-) diff --git a/memxor.S b/memxor.S index cb3d0e8..b89fccd 100644 --- a/memxor.S +++ b/memxor.S @@ -26,9 +26,6 @@ * */ -#include -#include "avr-asm-macros.S" - /* * void memxor(void* dest, const void* src, uint16_t n); */ diff --git a/shabea.c b/shabea.c index 52c9461..b59e138 100644 --- a/shabea.c +++ b/shabea.c @@ -1,21 +1,24 @@ /* shabea.c */ /* - This file is part of the Crypto-avr-lib/microcrypt-lib. - Copyright (C) 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. + * 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 . + */ - You should have received a copy of the GNU General Public License - along with this program. If not, see . -*/ /** * \file shabea.c * \author Daniel Otte @@ -33,8 +36,6 @@ #include "sha256.h" #include "config.h" -#include "uart.h" -#include "debug.h" #include "memxor.h" @@ -42,36 +43,47 @@ * SHABEA256-n */ -#define BLOCKSIZE 256 -#define BLOCKSIZEB (BLOCKSIZE/8) -#define HALFSIZEB (BLOCKSIZEB/2) -#define HALFSIZE (BLOCKSIZE/2) +#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){ - int8_t r; /**/ - uint8_t tb[HALFSIZEB+2+(keysize_b+7)/8]; /**/ + 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; - - r = (enc?0:(rounds-1)); + 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+HALFSIZEB+2, key, kbs); /* copy key to temporary block */ - tb[HALFSIZEB+0] = 0; /* set round counter high value to zero */ + 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!=(enc?(rounds):-1);enc?r++:r--){ /* enc: 0..(rounds-1) ; !enc: (rounds-1)..0 */ - memcpy(tb, R, HALFSIZEB); /* copy right half into tb */ - tb[HALFSIZEB+1] = r; - sha256(&hash, tb, HALFSIZE+16+keysize_b); - if(!(r==(enc?(rounds-1):0))){ + 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, HALFSIZEB); - memcpy(L, R, HALFSIZEB); - memcpy(R, hash, HALFSIZEB); + memxor(hash, L, SHABEA_HALFSIZEB); + memcpy(L, R, SHABEA_HALFSIZEB); + memcpy(R, hash, SHABEA_HALFSIZEB); } else { + /* last round */ /* no swap */ - memxor(L, hash, HALFSIZEB); + memxor(L, hash, SHABEA_HALFSIZEB); + return; } } } diff --git a/shabea.h b/shabea.h index 28432a2..fdb4916 100644 --- a/shabea.h +++ b/shabea.h @@ -1,27 +1,32 @@ /* shabea.h */ /* - This file is part of the Crypto-avr-lib/microcrypt-lib. - Copyright (C) 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 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 . + */ - 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 . -*/ /** * \file shabea.h * \author Daniel Otte * \date 2007-06-07 * \brief SHABEA - a SHA Based Encryption Algorithm declarations - * \license GPLv3 or later + * \par License + * GPL * * SHABEAn-r where n is the blocksize and r the number of round used * @@ -30,16 +35,5 @@ #ifndef SHABEA_H_ #define SHABEA_H_ -/** \fn void shabea256(void * block, const void * key, uint16_t keysize_b, uint8_t enc, uint8_t rounds); - * \brief shabea256 encryption/decryption - * - * \param block pointer to a 256 bit (32 byte block) to en/decrypt - * \param key pointer to the key material - * \param keysize_b length of the key in bits - * \param enc controls if encryption (1) or decryption (0) is done - * \param rounds rounds to be done by the cipher (it is not recommended to use less then four rounds) - */ -void shabea256(void * block, const void * key, uint16_t keysize_b, - uint8_t enc, uint8_t rounds); - +void shabea256(void * block, void * key, uint16_t keysize_b, uint8_t enc, uint8_t rounds); #endif /*SHABEA_H_*/ -- 2.39.5