From: mdw <mdw>
Date: Sat, 17 Jun 2000 10:48:29 +0000 (+0000)
Subject: CAST round function macros.
X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/commitdiff_plain/c54131f4f7ba19632d52f3f56b1fbc69d08732f1

CAST round function macros.
---

diff --git a/cast-base.h b/cast-base.h
new file mode 100644
index 0000000..841f221
--- /dev/null
+++ b/cast-base.h
@@ -0,0 +1,75 @@
+/* -*-c-*-
+ *
+ * $Id: cast-base.h,v 1.1 2000/06/17 10:48:29 mdw Exp $
+ *
+ * Basic macros and definitions for CAST-128 and CAST-256
+ *
+ * (c) 2000 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------* 
+ *
+ * This file is part of Catacomb.
+ *
+ * Catacomb is free software; you can redistribute it and/or modify
+ * 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: cast-base.h,v $
+ * Revision 1.1  2000/06/17 10:48:29  mdw
+ * CAST round function macros.
+ *
+ */
+
+#ifndef CATACOMB_CAST_BASE_H
+#define CATACOMB_CAST_BASE_H
+
+#ifdef __cplusplus
+  extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <mLib/bits.h>
+
+/*----- Round functions ---------------------------------------------------*/
+
+#define CAST_R_guts(km, kr, xx, yy, aop, bop, cop) do {			\
+  uint32 i = km aop yy;							\
+  unsigned _r = kr;							\
+  i = ROL32(i, _r);							\
+  xx ^= ((cast_s[0][U8(i >> 24)] bop					\
+	  cast_s[1][U8(i >> 16)]) cop					\
+	  cast_s[2][U8(i >>  8)]) aop					\
+	  cast_s[3][U8(i >>  0)];					\
+} while (0)
+
+#define CAST_R1(km, kr, xx, yy) CAST_R_guts(km, kr, xx, yy, +, ^, -)
+#define CAST_R2(km, kr, xx, yy) CAST_R_guts(km, kr, xx, yy, ^, -, +)
+#define CAST_R3(km, kr, xx, yy) CAST_R_guts(km, kr, xx, yy, -, +, ^)
+
+/*----- Global variables --------------------------------------------------*/
+
+extern uint32 cast_s[4][256], cast_sk[4][256];
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+  }
+#endif
+
+#endif