Merge branch 'master' of git+ssh://metalzone.distorted.org.uk/~mdw/public-git/catacomb/

[u/mdw/catacomb] / square-mktab.c

diff --git a/square-mktab.c b/square-mktab.c
index 5c2610e..ba2c539 100644 (file)
--- a/square-mktab.c
+++ b/square-mktab.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: square-mktab.c,v 1.1 2000/07/27 18:10:27 mdw Exp $
+ * $Id: square-mktab.c,v 1.3 2004/04/08 01:36:15 mdw Exp $
  *
  * Build precomputed tables for the Square block cipher
  *
@@ -27,14 +27,6 @@
  * MA 02111-1307, USA.
  */
 
-/*----- Revision history --------------------------------------------------* 
- *
- * $Log: square-mktab.c,v $
- * Revision 1.1  2000/07/27 18:10:27  mdw
- * Build precomuted tables for Square.
- *
- */
-
 /*----- Header files ------------------------------------------------------*/
 
 #include <assert.h>
@@ -84,9 +76,9 @@ static unsigned mul(unsigned x, unsigned y, unsigned m)
  * Build the S-box.
  *
  * This is built from inversion in the multiplicative group of
- * %$\gf{2^8}[x]/(p(x))$%, where %$p(x) = x^8 + x^4 + x^3 + x + 1$%, followed
- * by an affine transformation treating inputs as vectors over %$\gf{2}$%.
- * The result is a horrible function.
+ * %$\gf{2^8}[x]/(p(x))$%, where %$p(x) = x^8+x^7+x^6+x^5+x^4+x^2+1$%,
+ * followed by an affine transformation treating inputs as vectors over
+ * %$\gf{2}$%.  The result is a horrible function.
  *
  * The inversion is done slightly sneakily, by building log and antilog
  * tables.  Let %$a$% be an element of the finite field.  If the inverse of