X-Git-Url: https://git.cryptolib.org/?p=avr-crypto-lib.git;a=blobdiff_plain;f=gf256mul%2Fgf256mul.S;h=36991aed0c5bd2d6269ba929663e8fa5a8f9a0cc;hp=b269d3a4a1b760d2d372598bb0cbfdf87de1009c;hb=4b5da1dc27a791b5c448274a3db09cd035b33493;hpb=924aa320bef6f192feecdb67d209c790bd49ea49

diff --git a/gf256mul/gf256mul.S b/gf256mul/gf256mul.S
index b269d3a..36991ae 100644
--- a/gf256mul/gf256mul.S
+++ b/gf256mul/gf256mul.S
@@ -1,7 +1,7 @@
 /* gf256mul.S */
 /*
     This file is part of the AVR-Crypto-Lib.
-    Copyright (C) 2008  Daniel Otte (daniel.otte@rub.de)
+    Copyright (C) 2006-2015 Daniel Otte (bg@nerilex.org)
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -62,8 +62,26 @@ gf256mul:
 
 #else
 
+/*
+
+uint8_t gf256mul(uint8_t a, uint8_t b, uint8_t p) {
+	uint8_t r = 0, c = 8;
+	do {
+	    if (a & 1) {
+	        r ^= b;
+	    }
+	    a >>= 1;
+	    if (b & 0x80) {
+	        b ^= p;
+	    }
+	    b <<= 1;
+	} while (--c);
+	return r;
+}
+
+ */
 gf256mul:
-	mov r21, r24
+	mov A, r24
 	clr r24
 	ldi r25, 8
 1: