X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/b3f050848e5d285c2a1d7f8a4bea98984c201805..298182ad446aaced14dea7ed0e7c968946787288:/rc5.h

diff --git a/rc5.h b/rc5.h
index 877b849..93a0a9e 100644
--- a/rc5.h
+++ b/rc5.h
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: rc5.h,v 1.2 1999/12/10 23:29:48 mdw Exp $
+ * $Id: rc5.h,v 1.4 2004/04/08 01:36:15 mdw Exp $
  *
  * The RC5-32/12 block cipher
  *
@@ -27,15 +27,14 @@
  * MA 02111-1307, USA.
  */
 
-/*----- Revision history --------------------------------------------------* 
- *
- * $Log: rc5.h,v $
- * Revision 1.2  1999/12/10 23:29:48  mdw
- * Change header file guard names.
- *
- * Revision 1.1  1999/09/03 08:41:12  mdw
- * Initial import.
+/*----- Notes on the RC5 block cipher -------------------------------------*
  *
+ * RC5 was designed by Ron Rivest as a test vehicle for the use of data-
+ * dependent rotations in cryptographic transformations.  The algorithm is
+ * covered by a patent held by RSA Security Inc. (US Patent# 5,724,428).
+ * It's vulnerable to some clever differential attacks, which can break it in
+ * about %$2^{44}$% chosen plaintexts.  I don't recommend the use of this
+ * cipher.
  */
 
 #ifndef CATACOMB_RC5_H
@@ -52,10 +51,12 @@
 /*----- Magic numbers -----------------------------------------------------*/
 
 #define RC5_ROUNDS 12
-#define RC5_KEYSZ 0
+#define RC5_KEYSZ 10
 #define RC5_BLKSZ 8
 #define RC5_CLASS (N, L, 64)
 
+extern const octet rc5_keysz[];
+
 /*----- Data structures ---------------------------------------------------*/
 
 typedef struct rc5_ctx {