From bbdf729f289a7920c271991712558f566392af4a Mon Sep 17 00:00:00 2001
From: bg <daniel.otte@rub.de>
Date: Tue, 18 Sep 2012 17:10:35 +0200
Subject: [PATCH] few changes to aes, nothing of importance

---
 aes/aes_keyschedule.c | 26 ++++++++++++++++++--------
 aes/aes_types.h       |  2 +-
 2 files changed, 19 insertions(+), 9 deletions(-)

diff --git a/aes/aes_keyschedule.c b/aes/aes_keyschedule.c
index 30fac7d..80a5598 100644
--- a/aes/aes_keyschedule.c
+++ b/aes/aes_keyschedule.c
@@ -26,11 +26,13 @@
  */
 
 #include <stdint.h>
+#include <string.h>
+#include "memxor.h"
 #include "aes.h"
 #include "aes_keyschedule.h"
 #include "aes_sbox.h"
-#include <string.h>
 
+/*
 static
 void aes_rotword(void* a){
 	uint8_t t;
@@ -40,10 +42,12 @@ void aes_rotword(void* a){
 	((uint8_t*)a)[2] = ((uint8_t*)a)[3];
 	((uint8_t*)a)[3] = t;
 }
+*/
 
-uint8_t rc_tab[] = { 0x01, 0x02, 0x04, 0x08,
-                     0x10, 0x20, 0x40, 0x80,
-                     0x1b, 0x36 };
+const uint8_t rc_tab[] = {
+	0x01, 0x02, 0x04, 0x08,
+	0x10, 0x20, 0x40, 0x80,
+	0x1b, 0x36 };
 
 void aes_init(const void* key, uint16_t keysize_b, aes_genctx_t* ctx){
 	uint8_t hi,i,nk, next_nk;
@@ -52,12 +56,13 @@ void aes_init(const void* key, uint16_t keysize_b, aes_genctx_t* ctx){
 		uint32_t v32;
 		uint8_t  v8[4];
 	} tmp;
-	nk=keysize_b>>5; /* 4, 6, 8 */
-	hi=4*(nk+6+1);
+	nk = keysize_b >> 5; /* 4, 6, 8 */
+	hi = 4 * (nk + 6 + 1);
 	memcpy(ctx, key, keysize_b/8);
 	next_nk = nk;
 	for(i=nk; i<hi; ++i){
-		tmp.v32 = ((uint32_t*)(ctx->key[0].ks))[i-1];
+	/*	tmp.v32 = ((uint32_t*)(ctx->key[0].ks))[i-1]; */
+		memcpy(tmp.v8, ctx->key[0].ks + (i - 1) * 4, 4);
 		if(i != next_nk){
 			if(nk == 8 && i % 8 == 4){
 				tmp.v8[0] = aes_sbox[tmp.v8[0]];
@@ -67,7 +72,8 @@ void aes_init(const void* key, uint16_t keysize_b, aes_genctx_t* ctx){
 			}
 		} else {
 			next_nk += nk;
-			aes_rotword(&(tmp.v32));
+/*			aes_rotword(&(tmp.v32)); */
+			tmp.v32 = (tmp.v32 >> 8) | (tmp.v32 << 24);
 			tmp.v8[0] = aes_sbox[tmp.v8[0]];
 			tmp.v8[1] = aes_sbox[tmp.v8[1]];
 			tmp.v8[2] = aes_sbox[tmp.v8[2]];
@@ -75,8 +81,12 @@ void aes_init(const void* key, uint16_t keysize_b, aes_genctx_t* ctx){
 			tmp.v8[0] ^= rc_tab[rc];
 			rc++;
 		}
+		memcpy(ctx->key[0].ks + 4 * i, ctx->key[0].ks + (i - nk) * 4, 4);
+		memxor(ctx->key[0].ks + 4 * i, tmp.v8, 4);
+/*
 		((uint32_t*)(ctx->key[0].ks))[i] = ((uint32_t*)(ctx->key[0].ks))[i-nk]
 		                                   ^ tmp.v32;
+*/
 	}
 }
 
diff --git a/aes/aes_types.h b/aes/aes_types.h
index 2768521..6d68022 100644
--- a/aes/aes_types.h
+++ b/aes/aes_types.h
@@ -46,7 +46,7 @@ typedef struct __attribute__((packed)){
 } aes256_ctx_t;
 
 typedef struct __attribute__((packed)){
-	aes_roundkey_t key[1]; /* just to avoid the warning */
+	aes_roundkey_t key[15]; /* just to avoid the warning */
 } aes_genctx_t;
 
 typedef struct __attribute__((packed)){
-- 
2.39.5