util: Add AES ShiftRows and InvShiftRows Tables

This patch adds tables that implement the Advanced Encryption Standard (AES) ShiftRows
and InvShiftRows transformations.  These are commonly used in instruction models.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Alexander Graf <agraf@suse.de>

include/qemu/aes.h

diff --git a/include/qemu/aes.h b/include/qemu/aes.h
index a4044f5..c45bc57 100644
--- a/include/qemu/aes.h
+++ b/include/qemu/aes.h
@@ -26,6 +26,10 @@
 extern const uint8_t AES_sbox[256];
 extern const uint8_t AES_isbox[256];
 
+/* AES ShiftRows and InvShiftRows */
+extern const uint8_t AES_shifts[16];
+extern const uint8_t AES_ishifts[16];
+
 /*
 AES_Te0[x] = S [x].[02, 01, 01, 03];
 AES_Te1[x] = S [x].[03, 02, 01, 01];

util/aes.c

diff --git a/util/aes.c b/util/aes.c
index eeb644b..c26cf55 100644
--- a/util/aes.c
+++ b/util/aes.c
@@ -108,6 +108,14 @@
     0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D,
 };
 
+const uint8_t AES_shifts[16] = {
+    0, 5, 10, 15, 4, 9, 14, 3, 8, 13, 2, 7, 12, 1, 6, 11
+};
+
+const uint8_t AES_ishifts[16] = {
+    0, 13, 10, 7, 4, 1, 14, 11, 8, 5, 2, 15, 12, 9, 6, 3
+};
+
 /*
 AES_Te0[x] = S [x].[02, 01, 01, 03];
 AES_Te1[x] = S [x].[03, 02, 01, 01];