+Grain +corrected orthograpic some errors

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

diff --git a/grain_h_lutgen.c b/grain_h_lutgen.c
new file mode 100644 (file)
index 0000000..4b5ede0
--- /dev/null
+++ b/grain_h_lutgen.c
@@ -0,0 +1,60 @@
+/**
+ * 
+ * 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; 
+}
+