-/**
- *
- * author: Daniel Otte
- * email: daniel.otte@rub.de
- * license: GPLv3
- *
- * this program generate a lookuptable for the h-function in grain
- */
-
-#include <stdint.h>
-#include <stdio.h>
-
-#define X(i) ((x)>>((i)))
-uint8_t h(uint8_t x){
- uint8_t h;
-
- h = (X(1)) ^ (X(4)) ^
- (X(0)&X(3)) ^ (X(2)&X(3)) ^ (X(3)&X(4)) ^
- (X(0)&X(1)&X(2)) ^ (X(0)&X(2)&X(3)) ^ (X(0)&X(2)&X(4)) ^
- (X(1)&X(2)&X(4)) ^ (X(2)&X(3)&X(4)) ;
-
- return h&1;
-}
-
-int main(void){
- uint8_t i;
- uint32_t lut;
- puts(
- "/* \n"
- " * author: Daniel Otte \n"
- " * email: daniel.otte@rub.de \n"
- " * license: GPLv3 \n"
- " * \n"
- " * this program generate a lookuptable for the h-function in grain \n"
- " * \n"
- " */ \n");
- puts("/* \n"
- " * x0 x1 x2 x3 x4 - h");
-
- for(i=0; i<0x20; ++i){
- printf(" * %c %c %c %c %c - %c\n",
- (i&0x01)?'1':'0',
- (i&0x02)?'1':'0',
- (i&0x04)?'1':'0',
- (i&0x08)?'1':'0',
- (i&0x10)?'1':'0',
- (h(i))?'1':'0' );
- lut >>=1;
- lut |= h(i)?0x80000000:0x00000000;
- if(i%4==3){
- puts(" * --");
- }
- }
- puts(" */\n");
- printf(" uint8_t lut[4]= {0x%2.2X, 0x%2.2X, 0x%2.2X, 0x%2.2X} \n",
- lut&0xFF, (lut>>8)&0xFF, (lut>>16)&0xFF, (lut>>24)&0xFF);
-
- return 0;
-}
-