crypto: aes - Move key_length in struct crypto_aes_ctx to be the last field

The Intel AES-NI AES acceleration instructions need key_enc, key_dec
in struct crypto_aes_ctx to be 16 byte aligned, it make this easier to
move key_length to be the last one.

Signed-off-by: Huang Ying <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

arch/x86/crypto/aes-i586-asm_32.S

···
 #define in_blk 16
 
 /* offsets in crypto_tfm structure */
-#define klen (crypto_tfm_ctx_offset + 0)
-#define ekey (crypto_tfm_ctx_offset + 4)
-#define dkey (crypto_tfm_ctx_offset + 244)
+#define klen (crypto_tfm_ctx_offset + 480)
+#define ekey (crypto_tfm_ctx_offset + 0)
+#define dkey (crypto_tfm_ctx_offset + 240)
 
 // register mapping for encrypt and decrypt subroutines
 

arch/x86/crypto/aes-x86_64-asm_64.S

···
 	.align	8;			\
 FUNC:	movq	r1,r2;			\
 	movq	r3,r4;			\
-	leaq	BASE+KEY+48+4(r8),r9;	\
+	leaq	BASE+KEY+48(r8),r9;	\
 	movq	r10,r11;		\
 	movl	(r7),r5 ## E;		\
 	movl	4(r7),r1 ## E;		\
 	movl	8(r7),r6 ## E;		\
 	movl	12(r7),r7 ## E;		\
-	movl	BASE+0(r8),r10 ## E;	\
+	movl	BASE+480(r8),r10 ## E;	\
 	xorl	-48(r9),r5 ## E;	\
 	xorl	-44(r9),r1 ## E;	\
 	xorl	-40(r9),r6 ## E;	\

include/crypto/aes.h

···
 #define AES_MAX_KEYLENGTH	(15 * 16)
 #define AES_MAX_KEYLENGTH_U32	(AES_MAX_KEYLENGTH / sizeof(u32))
 
+/*
+ * Please ensure that the first two fields are 16-byte aligned
+ * relative to the start of the structure, i.e., don't move them!
+ */
 struct crypto_aes_ctx {
-	u32 key_length;
 	u32 key_enc[AES_MAX_KEYLENGTH_U32];
 	u32 key_dec[AES_MAX_KEYLENGTH_U32];
+	u32 key_length;
 };
 
 extern const u32 crypto_ft_tab[4][256];