/* -*-c-*-
*
- * $Id: rc5.h,v 1.1 1999/09/03 08:41:12 mdw Exp $
+ * $Id: rc5.h,v 1.4 2004/04/08 01:36:15 mdw Exp $
*
* The RC5-32/12 block cipher
*
* (c) 1999 Straylight/Edgeware
*/
-/*----- Licensing notice --------------------------------------------------*
+/*----- Licensing notice --------------------------------------------------*
*
* This file is part of Catacomb.
*
* it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
- *
+ *
* Catacomb is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
- *
+ *
* You should have received a copy of the GNU Library General Public
* License along with Catacomb; if not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
-/*----- Revision history --------------------------------------------------*
- *
- * $Log: rc5.h,v $
- * 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 RC5_H
-#define RC5_H
+#ifndef CATACOMB_RC5_H
+#define CATACOMB_RC5_H
#ifdef __cplusplus
extern "C" {
/*----- 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 {