(SBOX1): Renamed arguments. Eliminated temporaries.

Rev: nettle/ChangeLog:1.178
Rev: nettle/serpent-encrypt.c:1.3

ChangeLog

@@ -2,6 +2,7 @@
 
 	* serpent-encrypt.c (SBOX0): Renamed arguments. Eliminated
 	temporaries.
+	(SBOX1): Likewise.
 
 2011-06-06  Niels Mller  <nisse@lysator.liu.se>
 

serpent-encrypt.c

@@ -95,28 +95,26 @@
   } while (0)
 
 /* S1: 15 12  2  7  9  0  5 10  1 11 14  8  6 13  3  4 */
-#define SBOX1(type, a, b, c, d, w, x, y, z)	\
-  do { \
-    type t02, t03, t04, t05, t06, t07, t08; \
-    type t10, t11, t12, t13, t16, t17, t01; \
-    t01 = a   | d  ; \
-    t02 = c   ^ d  ; \
-    t03 =     ~ b  ; \
-    t04 = a   ^ c  ; \
-    t05 = a   | t03; \
-    t06 = d   & t04; \
-    t07 = t01 & t02; \
-    t08 = b   | t06; \
-    y   = t02 ^ t05; \
-    t10 = t07 ^ t08; \
-    t11 = t01 ^ t10; \
-    t12 = y   ^ t11; \
-    t13 = b   & d  ; \
-    z   =     ~ t10; \
-    x   = t13 ^ t12; \
-    t16 = t10 | x  ; \
-    t17 = t05 & t16; \
-    w   = c   ^ t17; \
+#define SBOX1(type, x0, x1, x2, x3, y0, y1, y2, y3)	\
+  do {							\
+    y1  = x0 | x3;					\
+    y2  = x2 ^ x3;					\
+    y0  = ~ x1;						\
+    y3  = x0   ^ x2;					\
+    y0 |= x0;						\
+    y3 &= x3;						\
+    x0 = y1 & y2;					\
+    y3 |= x1;						\
+    y2 ^= y0;						\
+    y3 ^= x0;						\
+    x0  = y1 ^ y3;					\
+    x0 ^= y2;						\
+    y1  = x1   & x3;					\
+    y1 ^= x0;						\
+    x3  = y3 | y1;					\
+    y3  = ~ y3;						\
+    y0 &= x3;						\
+    y0 ^= x2;						\
   } while (0)
 
 /* S2:  8  6  7  9  3 12 10 15 13  1 14  4  0 11  5  2 */