new makefile and modified build process

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

diff --git a/twister/twister.c b/twister/twister.c
new file mode 100644 (file)
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--- /dev/null
+++ b/twister/twister.c
@@ -0,0 +1,116 @@
+/* twister.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/>.
+*/
+
+#include "config.h"
+#include <stdint.h>
+#include <string.h>
+#include <avr/pgmspace.h>
+#include "twister.h"
+#include "twister_tables.h"
+#include "memxor.h"
+
+//#ifndef TWISTER_MUL_TABLE
+# include "gf256mul.h"
+//#endif
+
+#define MDS(a,b)  pgm_read_byte(&(twister_mds[(a)][(b)]))
+
+//#ifdef TWISTER_MUL_TABLE
+//# define MULT(a,b) pgm_read_byte(&(twister_multab[(a)][(b)]))
+//#else
+# define MULT(a,b) gf256mul((a),(b), 0x4D)
+//#endif
+
+void twister_blank_round(twister_state_t* ctx){
+       uint8_t i,j,k;
+       uint8_t tmp[8][8];
+       /* add twist counter */
+       for(i=0; i<8; ++i){
+               ctx->s[i][1] ^= ((uint8_t*)&(ctx->counter))[7-i];
+       }
+       ctx->counter--;
+       /* sub bytes */
+       for(i=0; i<8; ++i){
+               for(j=0;j<8;++j){
+                       tmp[i][j] = pgm_read_byte(twister_sbox+ctx->s[i][j]);
+               }
+       }
+       /* mix columns with integrates shift rows */
+       for( i=0; i<8; i++ ){
+               // multiply with mds matrix
+               for( j=0; j<8; j++ ){
+                       k=(i+1)&7;
+                       ctx->s[j][i] =
+                               MULT( MDS(j,0), (tmp[0][i]) );
+                       ctx->s[j][i] ^=  
+                               MULT( MDS(j,1), (tmp[1][k]) );
+                       ctx->s[j][i] ^=  
+                               MULT( MDS(j,2), (tmp[2][((++k)&7)]) );
+                       ctx->s[j][i] ^=  
+                               MULT( MDS(j,3), (tmp[3][((++k)&7)]) );
+                       ctx->s[j][i] ^=  
+                               MULT( MDS(j,4), (tmp[4][((++k)&7)]) );
+                       ctx->s[j][i] ^=  
+                               MULT( MDS(j,5), (tmp[5][((++k)&7)]) );
+                       ctx->s[j][i] ^=  
+                               MULT( MDS(j,6), (tmp[6][((++k)&7)]) );
+                       ctx->s[j][i] ^=  
+                               MULT( MDS(j,7), (tmp[7][((++k)&7)]) );
+                               
+               }       
+       }
+}
+void twister_mini_round(twister_state_t* ctx, const void* msg){
+       /* inject message */
+       uint8_t i;
+       for(i=0; i<8; ++i){
+               ctx->s[7][7-i] ^= *((uint8_t*)msg);
+               msg = (uint8_t*)msg +1; 
+       }
+       twister_blank_round(ctx);
+}
+
+void twister_ctx2hash(void* dest, twister_state_t* ctx, uint16_t hashsize_b){
+       uint8_t tmp[8][8];
+       uint8_t j;
+       uint16_t i=hashsize_b;
+       while(i>=64){
+               i-=64;
+               memcpy(tmp,ctx->s, 64);
+               twister_blank_round(ctx);
+               memxor(ctx->s, tmp, 64);
+               twister_blank_round(ctx);
+               for(j=0; j<8; ++j){
+                       *((uint8_t*)dest) = ctx->s[7-j][0] ^ tmp[7-j][0];
+                       dest = (uint8_t*)dest + 1;
+               }
+       }
+       if(i>=32){
+               memcpy(tmp,ctx->s, 64);
+               twister_blank_round(ctx);
+               memxor(ctx->s, tmp, 64);
+               twister_blank_round(ctx);
+               for(j=0; j<4; ++j){
+                       *((uint8_t*)dest) = ctx->s[3-j][0] ^ tmp[3-j][0];
+                       dest = (uint8_t*)dest + 1;
+               }
+       }
+}
+
+