--- md5slice.c-prev	2007-11-12 06:04:43 +0300
+++ md5slice.c	2007-11-12 23:40:53 +0300
@@ -92,6 +92,32 @@
 	} while (--i);
 }
 
+static void add32r(n, x, y, z)
+int n;
+vector *x, *y, *z;
+{
+	int i;
+	vector *yr, a, b, c, p;
+
+	i = n;
+	n = 32 - n;
+	yr = y + n;
+	c ^= c; // c = 0;
+	do {
+		a = *x++;
+		b = *yr++;
+		*z++ = (p = a ^ b) ^ c;
+		c = (p & c) | (a & b);
+	} while (--i);
+
+	do {
+		a = *x++;
+		b = *y++;
+		*z++ = (p = a ^ b) ^ c;
+		c = (p & c) | (a & b);
+	} while (--n);
+}
+
 static void F(x, y, z, f)
 vector *x, *y, *z, *f;
 {
@@ -133,23 +159,6 @@
 	} while (--i);
 }
 
-static void rol32(n, x, y)
-int n;
-vector *x, *y;
-{
-	int i, j;
-
-	j = 32 - (i = n);
-	do {
-		*y++ = x[j++];
-	} while (--i);
-
-	i = 32 - n;
-	do {
-		*y++ = *x++;
-	} while (--i);
-}
-
 static void const32(x, y)
 scalar x;
 vector *y;
@@ -181,8 +190,7 @@
 	f(b, c, d, tmp);
 	add32c(ac, x, tmp, tmp);
 	add32(a, tmp, tmp);
-	rol32(s, tmp, a);
-	add32(b, a, a);
+	add32r(s, b, tmp, a);
 }
 
 #define FF(a, b, c, d, x, s, ac) XX(F, a, b, c, d, x, s, ac)