From: Niels Möller <nisse@lysator.liu.se>
Date: Tue, 14 May 2002 17:27:19 +0000 (+0200)
Subject: (aes_encrypt): Deleted xchgl instruction in final round, by
X-Git-Tag: nettle_1.6_release_20021003~194
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cba53182d4dac3f63a8ce310a3a0b56f7d93fc1e;p=thirdparty%2Fnettle.git

(aes_encrypt): Deleted xchgl instruction in final round, by
reordering the second and fourth round.

Rev: src/nettle/x86/aes-encrypt.asm:1.6
---

diff --git a/x86/aes-encrypt.asm b/x86/aes-encrypt.asm
index fddf0a16..a76ec156 100644
--- a/x86/aes-encrypt.asm
+++ b/x86/aes-encrypt.asm
@@ -187,7 +187,7 @@ C .Laes_got_t:
 	pushl	%edi
 
 	C second column
-	AES_LAST_ROUND(d,a,b,c)
+	AES_LAST_ROUND(b,c,d,a)
 	pushl	%edi
 
 	C third column
@@ -195,13 +195,12 @@ C .Laes_got_t:
 	pushl	%edi
 
 	C fourth column
-	AES_LAST_ROUND(b,c,d,a)
+	AES_LAST_ROUND(d,a,b,c)
 	movl	%edi,%edx
 	
 	popl	%ecx
 	popl	%ebx
 	popl	%eax
-	xchgl	%ebx,%edx
 
 	C // S-box substitution
 	mov	$4,%edi