From 011628d3ce40918b84c160cdc493cf0da8eec210 Mon Sep 17 00:00:00 2001
From: Stephen Heumann <stephenheumann@gmail.com>
Date: Mon, 3 Jul 2017 15:45:18 -0500
Subject: [PATCH] More rotate optimizations for SHA-256.

---
 sha256.macros | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/sha256.macros b/sha256.macros
index 1005ec0..213be00 100644
--- a/sha256.macros
+++ b/sha256.macros
@@ -362,8 +362,8 @@
 	sta	temp1+2
 	lda	&e+1
 	sta	temp1
-	ROTL4CONT temp1,2
-	ROTR4MOVE temp2,temp1,5
+	ROTR4MOVE temp2,temp1,3
+	ROTL4	temp1,2
 	lda	&e-1
 	and	#$FF00
 	sta	temp3
@@ -437,7 +437,16 @@
 	lda	&a+2
 	sta	temp3
 	ROTL4CONT temp3,3
-	ROTR4MOVE temp4,&a,22
+	lda	&a+1
+	sta	temp4+2
+	lda	&a-1
+	and	#$FF00
+	sta	temp4
+	lda	&a+3
+	and	#$00FF
+	ora	temp4
+	sta	temp4
+	ROTL4CONT temp4,2
 	lda	temp2
 	eor	temp3
 	eor	temp4