--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/notes/etc/whirlgen.c	Wed Mar 08 12:58:00 2006 +0000
@@ -0,0 +1,95 @@
+#include <stdio.h>
+
+unsigned E[16] =  { 1, 0xb, 9, 0xc, 0xd, 6, 0xf, 3, 0xe, 8, 7, 4, 0xa, 2, 5, 0 };
+unsigned Ei[16];
+unsigned R[16] =  { 7, 0xc, 0xb, 0xd, 0xe, 4, 9, 0xf, 6, 3, 8, 0xa, 2, 5, 1, 0 };
+unsigned cir[8][8] = { 
+ {1, 1, 4, 1, 8, 5, 2, 9 },
+}; 
+
+
+unsigned gf_mul(unsigned a, unsigned b)
+{
+   unsigned r;
+   
+   r = 0;
+   while (a) {
+      if (a & 1) r ^= b;
+      a >>= 1;
+      b = (b << 1) ^ (b & 0x80 ? 0x11d : 0x00);
+   }
+   return r;
+}
+
+unsigned sbox(unsigned x)
+{
+   unsigned a, b, w;
+   
+   a = x >> 4;
+   b = x & 15;
+   
+   a = E[a]; b = Ei[b];
+   w = a ^ b; w = R[w];
+   a = E[a ^ w]; b = Ei[b ^ w];
+   
+   
+   return (a << 4) | b;
+}
+
+int main(void)
+{
+   unsigned x, y;
+   
+   for (x = 0; x < 16; x++) Ei[E[x]] = x;
+   
+//   for (x = 0; x < 16; x++) printf("%2x ", sbox(x));
+   for (y = 1; y < 8; y++) {
+      for (x = 0; x < 8; x++) {
+          cir[y][x] = cir[y-1][(x-1)&7];
+      }
+   }
+
+/*   
+   printf("\n");
+   for (y = 0; y < 8; y++) {
+       for (x = 0; x < 8; x++) printf("%2d ", cir[y][x]);
+       printf("\n");
+   }
+*/
+
+   for (y = 0; y < 8; y++) {
+       printf("static const ulong64 sbox%d[] = {\n", y);
+       for (x = 0; x < 256; ) {
+           printf("CONST64(0x%02x%02x%02x%02x%02x%02x%02x%02x)",
+              gf_mul(sbox(x), cir[y][0]),
+              gf_mul(sbox(x), cir[y][1]),
+              gf_mul(sbox(x), cir[y][2]),
+              gf_mul(sbox(x), cir[y][3]),
+              gf_mul(sbox(x), cir[y][4]),
+              gf_mul(sbox(x), cir[y][5]),
+              gf_mul(sbox(x), cir[y][6]),
+              gf_mul(sbox(x), cir[y][7]));
+           if (x < 255) printf(", ");
+           if (!(++x & 3)) printf("\n");
+       }
+       printf("};\n\n");
+  }
+  
+  printf("static const ulong64 cont[] = {\n");
+  for (y = 0; y <= 10; y++) {
+      printf("CONST64(0x");
+      for (x = 0; x < 8; x++) {
+         printf("%02x", sbox((8*y + x)&255));
+      }
+      printf("),\n");
+  }
+  printf("};\n\n");
+  return 0;
+   
+}
+
+
+
+/* $Source: /cvs/libtom/libtomcrypt/notes/etc/whirlgen.c,v $ */
+/* $Revision: 1.2 $ */
+/* $Date: 2005/05/05 14:35:58 $ */