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