From c5885da83814455af8341d1697d6848ddb0c1a91 Mon Sep 17 00:00:00 2001
From: mdw <mdw>
Date: Sat, 17 Jun 2000 10:47:06 +0000
Subject: [PATCH] Slight support for 96-bit ciphers.  Support for counter-mode
 ciphers.

---
 blkc.h | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 52 insertions(+), 3 deletions(-)

diff --git a/blkc.h b/blkc.h
index fcd31dd..1debf54 100644
--- a/blkc.h
+++ b/blkc.h
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: blkc.h,v 1.2 1999/12/10 23:29:48 mdw Exp $
+ * $Id: blkc.h,v 1.3 2000/06/17 10:47:06 mdw Exp $
  *
  * Common definitions for block ciphers
  *
@@ -30,6 +30,9 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: blkc.h,v $
+ * Revision 1.3  2000/06/17 10:47:06  mdw
+ * Slight support for 96-bit ciphers.  Support for counter-mode ciphers.
+ *
  * Revision 1.2  1999/12/10 23:29:48  mdw
  * Change header file guard names.
  *
@@ -47,6 +50,8 @@
 
 /*----- Header files ------------------------------------------------------*/
 
+#include <assert.h>
+
 #include <mLib/bits.h>
 
 /*----- Theory of operation -----------------------------------------------*
@@ -106,6 +111,20 @@
   BLKC_GLUE(BLKC_XMOVE_, BLKC_TYPE(PRE))				\
     (PRE, w, wx, BLKC_BITS(PRE))
 
+#define BLKC_STEP(PRE, w)						\
+  BLKC_GLUE(BLKC_STEP_X_, BLKC_ENDIAN(PRE))				\
+    (PRE, w)
+
+#define BLKC_SET(PRE, w, x)						\
+  BLKC_GLUE(BLKC_SET_X_, BLKC_ENDIAN(PRE))				\
+    (PRE, w, x)
+
+#define BLKC_SHOW(PRE, tag, w) do {					\
+  fputs(tag ": ", stdout);						\
+  BLKC_SKEL_X(PRE, BLKC_W(w);, printf("%08x ", *_w++););		\
+  fputc('\n', stdout);							\
+} while (0)
+
 /* --- General implementation skeleton --- */
 
 #define BLKC_SKEL(PRE, decl, guts) do {					\
@@ -115,12 +134,12 @@
 
 #define BLKC_P(p) register octet *_p = (octet *)(p)
 #define BLKC_W(w) register uint32 *_w = (w)
-#define BLKC_WX(wx) register uint32 *_wx = (wx);
+#define BLKC_WX(wx) register uint32 *_wx = (wx)
 
 /* --- Implementation for unusual block sizes --- */
 
 #define BLKC_SKEL_X(PRE, decl, guts)					\
-  BLKC_SKEL(PRE, int _i; decl,						\
+  BLKC_SKEL(PRE, unsigned _i; decl,					\
 	    for (_i = 0; _i < PRE##_BLKSZ / 4; _i++) {			\
 	      guts							\
 	    })
@@ -149,11 +168,41 @@
   BLKC_SKEL_X(PRE, BLKC_W(w); const BLKC_WX(wx);,			\
 	      *_w ^= *_wx; _w++; _wx++; )				\
 
+#define BLKC_STEP_X_B(PRE, w) do {					\
+  unsigned _i = PRE##_BLKSZ / 4; BLKC_W(w); uint32 _x = 0;		\
+  while (_i && !_x) { _i--; _w[_i] = _x = U32(_w[_i] + 1); }		\
+} while (0)
+
+#define BLKC_STEP_X_L(PRE, w) do {					\
+  unsigned _i = 0; BLKC_W(w); uint32 _x = 0;				\
+  while (_i < PRE##_BLKSZ / 4 && !_x)					\
+    { _w[_i] = _x = U32(_w[_i] + 1); _i++; }				\
+} while (0)
+
+#define BLKC_SET_X_B(PRE, w, x) do {					\
+  unsigned _i; BLKC_W(w); unsigned long _x = x;				\
+  for (_i = 0; _i < PRE##_BLKSZ / 4; _i++) {				\
+    *_w++ = U32(_x);							\
+    _x = ((_x & ~MASK32) >> 16) >> 16;					\
+  }									\
+} while (0)
+
+#define BLKC_SET_X_L(PRE, w, x) do {					\
+  unsigned _i; BLKC_W(w); unsigned long _x = x;	_w += PRE##_BLKSZ / 4;	\
+  for (_i = 0; _i < PRE##_BLKSZ / 4; _i++) {				\
+    *--_w = U32(_x);							\
+    _x = ((_x & ~MASK32) >> 16) >> 16;					\
+  }									\
+} while (0)
+
 /* --- Implementation for known block sizes --- */
 
 #define BLKC_SKEL_64(PRE, decl, op, guts)				\
   BLKC_SKEL(PRE, decl, guts(op, 0); guts(op, 1);)
 
+#define BLKC_SKEL_96(PRE, decl, op, guts)				\
+  BLKC_SKEL(PRE, decl, guts(op, 0); guts(op, 1); guts(op, 2);)
+
 #define BLKC_SKEL_128(PRE, decl, op, guts)				\
   BLKC_SKEL(PRE, decl, guts(op, 0); guts(op, 1); guts(op, 2); guts(op, 3);)
 
-- 
2.11.0