modified structure

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

diff --git a/serpent.c b/serpent.c
deleted file mode 100644 (file)
index 40ccecd..0000000
--- a/serpent.c
+++ /dev/null
@@ -1,140 +0,0 @@
-/* serpent.c */
-/*
-    This file is part of the AVR-Crypto-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.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-/* serpent.c
- * a bitsliced implementation of the serpent cipher for avr microcontrollers
- * author: Daniel Otte 
- * email:  daniel.otte@rub.de
- * license: GPLv3
- */
-
-#include <stdint.h>
-#include <string.h> /* memset() */
-#include <avr/pgmspace.h>
-#include "memxor.h"
-#include "serpent.h"
-#include "serpent-sboxes.h"
-
-/******************************************************************************/
-
-uint32_t rotl32(uint32_t a, uint8_t n){
-       return ((a<<n) | (a>>(32-n)));
-}
-
-
-uint32_t rotr32(uint32_t a, uint8_t n){
-       return ((a>>n) | (a<<(32-n)));
-}
-
-
-#define X0 (((uint32_t*)b)[0])
-#define X1 (((uint32_t*)b)[1])
-#define X2 (((uint32_t*)b)[2])
-#define X3 (((uint32_t*)b)[3])
-
-static void serpent_lt(uint8_t *b){
-       X0 = rotl32(X0, 13);
-       X2 = rotl32(X2,  3);
-       X1 ^= X0 ^ X2;
-       X3 ^= X2 ^ (X0 << 3);
-       X1 = rotl32(X1, 1);
-       X3 = rotl32(X3, 7);
-       X0 ^= X1 ^ X3;
-       X2 ^= X3 ^ (X1 << 7);
-       X0 = rotl32(X0, 5);
-       X2 = rotr32(X2, 10);
-}
-
-static void serpent_inv_lt(uint8_t *b){
-       X2 = rotl32(X2, 10);
-       X0 = rotr32(X0, 5);
-       X2 ^= X3 ^ (X1 << 7);
-       X0 ^= X1 ^ X3;
-       X3 = rotr32(X3, 7);
-       X1 = rotr32(X1, 1);
-       X3 ^= X2 ^ (X0 << 3);
-       X1 ^= X0 ^ X2;
-       X2 = rotr32(X2,  3);
-       X0 = rotr32(X0, 13);
-}
-
-#define GOLDEN_RATIO 0x9e3779b9l
-
-static uint32_t serpent_gen_w(uint32_t * b, uint8_t i){
-       uint32_t ret;
-       ret = b[0] ^ b[3] ^ b[5] ^ b[7] ^ GOLDEN_RATIO ^ (uint32_t)i;
-       ret = rotl32(ret, 11);
-       return ret;
-} 
-
-void serpent_init(const void* key, uint16_t keysize_b, serpent_ctx_t* ctx){
-       uint32_t buffer[8];
-       uint8_t i,j;
-       if(keysize_b<256){
-               /* keysize is less than 256 bit, padding needed */
-               memset(buffer, 0, 32);
-               memcpy(buffer, key, (keysize_b+7)/8);
-               ((uint8_t*)buffer)[keysize_b/8] |= 1<<(keysize_b%8);
-       } else {
-               /* keysize is 256 bit */
-               memcpy(buffer, key, 32); 
-       }
-       for(i=0; i<33; ++i){
-               for(j=0; j<4; ++j){
-                       ctx->k[i][j] = serpent_gen_w(buffer, i*4+j);
-                       memmove(buffer, &(buffer[1]), 7*4); /* shift buffer one to the "left" */
-                       buffer[7] = ctx->k[i][j];
-               }
-       }
-       for(i=0; i<33; ++i){
-               sbox128(ctx->k[i],3-i);
-       }
-}
-
-void serpent_enc(void* buffer, const serpent_ctx_t* ctx){
-       uint8_t i;
-       for(i=0; i<31; ++i){
-               memxor(buffer, ctx->k[i], 16);
-               sbox128(buffer, i);
-               serpent_lt((uint8_t*)buffer);
-       }
-       memxor(buffer, ctx->k[i], 16);
-       sbox128(buffer, i);
-       ++i;
-       memxor(buffer, ctx->k[i], 16);
-}
-
-void serpent_dec(void* buffer, const serpent_ctx_t* ctx){
-       int8_t i=32;
-       
-       memxor(buffer, ctx->k[i], 16);
-       --i;
-       inv_sbox128(buffer, i);
-       memxor((uint8_t*)buffer, ctx->k[i], 16);
-       --i;
-       for(; i>=0; --i){
-               serpent_inv_lt(buffer);
-               inv_sbox128(buffer, i);
-               memxor(buffer, ctx->k[i], 16);
-       }
-}
-
-
-
-
-