From: Niels Möller <nisse@lysator.liu.se>
Date: Wed, 15 May 2002 14:15:14 +0000 (+0200)
Subject: (aes_decrypt): Deleted first xchgl instruction into, permuting the
X-Git-Tag: nettle_1.6_release_20021003~144
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=49c91fe653d7f937c193b769f324d100196df591;p=thirdparty%2Fnettle.git

(aes_decrypt): Deleted first xchgl instruction into, permuting the
AES_ROUND calls instead.
(aes_decrypt): Likewise for the final round.

Rev: src/nettle/x86/aes-decrypt.asm:1.14
---

diff --git a/x86/aes-decrypt.asm b/x86/aes-decrypt.asm
index 6faec7a6..09eba870 100644
--- a/x86/aes-decrypt.asm
+++ b/x86/aes-decrypt.asm
@@ -56,9 +56,6 @@ aes_decrypt:
 .Lround_loop:
 	pushl	%esi		C  save this first: we'll clobber it later
 
-	C Why???
-	C xchgl	%ebx,%edx
-
 	AES_ROUND(_aes_decrypt_table,a,d,c,b)
 	pushl	%edi		C  save first on stack
 
@@ -85,21 +82,18 @@ aes_decrypt:
 	decl	%ebp
 	jnz	.Lround_loop
 
-	C Foo?
-	xchgl	%ebx,%edx
-
 	C last round
 
-	AES_FINAL_ROUND(a,b,c,d)
+	AES_FINAL_ROUND(a,d,c,b)
 	pushl	%edi
 
-	AES_FINAL_ROUND(b,c,d,a)
+	AES_FINAL_ROUND(d,c,b,a)
 	pushl	%edi
 
-	AES_FINAL_ROUND(c,d,a,b)
+	AES_FINAL_ROUND(c,b,a,d)
 	pushl	%edi
 
-	AES_FINAL_ROUND(d,a,b,c)
+	AES_FINAL_ROUND(b,a,d,c)
 	
 	movl	%edi,%edx
 	popl	%ecx