122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
/* seed.c */
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/*
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This file is part of the Crypto-avr-lib/microcrypt-lib.
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Copyright (C) 2008 Daniel Otte (daniel.otte@rub.de)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* \file seed.c
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* \author Daniel Otte
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* \date 2007-06-1
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* \brief SEED parts in C for AVR
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* \par License
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* GPL
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*
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*/
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#include <stdint.h>
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#include <avr/pgmspace.h>
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#include <string.h>
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#include "seed.h"
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#include "uart.h"
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#include "debug.h"
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/******************************************************************************/
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typedef struct {
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uint32_t k0, k1;
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} keypair_t;
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uint64_t seed_f_function(const uint64_t* a, uint32_t k0, uint32_t k1);
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keypair_t seed_getnextkeys(uint32_t *keystate, uint8_t curround);
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keypair_t seed_getprevkeys(uint32_t *keystate, uint8_t curround);
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/******************************************************************************/
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#define L (((uint64_t*)buffer)[0])
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#define R (((uint64_t*)buffer)[1])
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void seed_enc(void * buffer, seed_ctx_t * ctx){
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uint8_t r;
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keypair_t k;
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for(r=0; r<8; ++r){
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k = seed_getnextkeys(ctx->k, 2*r);
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/*
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DEBUG_S("\r\n\tDBG ka,0: "); uart_hexdump(&k.k0, 4);
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DEBUG_S("\r\n\tDBG ka,1: "); uart_hexdump(&k.k1, 4);
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DEBUG_S("\r\n\t DBG L: "); uart_hexdump((uint8_t*)buffer+0, 8);
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DEBUG_S("\r\n\t DBG R: "); uart_hexdump((uint8_t*)buffer+8, 8);
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*/
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L ^= seed_f_function(&R,k.k0,k.k1);
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k = seed_getnextkeys(ctx->k, 2*r+1);
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/*
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DEBUG_S("\r\n\tDBG kb,0: "); uart_hexdump(&k.k0, 4);
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DEBUG_S("\r\n\tDBG kb,1: "); uart_hexdump(&k.k1, 4);
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DEBUG_S("\r\n\t DBG L: "); uart_hexdump((uint8_t*)buffer+8, 8);
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DEBUG_S("\r\n\t DBG R: "); uart_hexdump((uint8_t*)buffer+0, 8);
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*/
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R ^= seed_f_function(&L,k.k0,k.k1);
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}
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/* just an exchange without temp. variable */
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L ^= R;
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R ^= L;
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L ^= R;
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}
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/******************************************************************************/
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#define L (((uint64_t*)buffer)[0])
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#define R (((uint64_t*)buffer)[1])
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void seed_dec(void * buffer, seed_ctx_t * ctx){
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int8_t r;
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keypair_t k;
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for(r=7; r>=0; --r){
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k = seed_getprevkeys(ctx->k, 2*r+1);
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/*
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DEBUG_S("\r\n\tDBG ka,0: "); uart_hexdump(&k.k0, 4);
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DEBUG_S("\r\n\tDBG ka,1: "); uart_hexdump(&k.k1, 4);
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DEBUG_S("\r\n\t DBG L: "); uart_hexdump((uint8_t*)buffer+0, 8);
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DEBUG_S("\r\n\t DBG R: "); uart_hexdump((uint8_t*)buffer+8, 8);
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*/
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L ^= seed_f_function(&R,k.k0,k.k1);
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k = seed_getprevkeys(ctx->k, 2*r+0);
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/*
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DEBUG_S("\r\n\tDBG kb,0: "); uart_hexdump(&k.k0, 4);
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DEBUG_S("\r\n\tDBG kb,1: "); uart_hexdump(&k.k1, 4);
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DEBUG_S("\r\n\t DBG L: "); uart_hexdump((uint8_t*)buffer+8, 8);
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DEBUG_S("\r\n\t DBG R: "); uart_hexdump((uint8_t*)buffer+0, 8);
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*/
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R ^= seed_f_function(&L,k.k0,k.k1);
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}
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/* just an exchange without temp. variable */
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L ^= R;
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R ^= L;
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L ^= R;
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}
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