Long Range
LR Initial Publish
Dependencies: X_NUCLEO_IKS01A2 driver_mbed_TH02 mbed LoRaWAN-lib-v1_0_1 SX1272Lib
Fork of
Training-Aug2018-SX1272-X-NUCLEO-IKS01A2
by 
Uttam Bhat
Diff: system/crypto/aes.cpp
- Revision:
- 0:6cc76d70e2a1
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/system/crypto/aes.cpp Thu Apr 06 21:59:50 2017 +0000
@@ -0,0 +1,936 @@
+/*
+ ---------------------------------------------------------------------------
+ Copyright (c) 1998-2008, Brian Gladman, Worcester, UK. All rights reserved.
+
+ LICENSE TERMS
+
+ The redistribution and use of this software (with or without changes)
+ is allowed without the payment of fees or royalties provided that:
+
+ 1. source code distributions include the above copyright notice, this
+ list of conditions and the following disclaimer;
+
+ 2. binary distributions include the above copyright notice, this list
+ of conditions and the following disclaimer in their documentation;
+
+ 3. the name of the copyright holder is not used to endorse products
+ built using this software without specific written permission.
+
+ DISCLAIMER
+
+ This software is provided 'as is' with no explicit or implied warranties
+ in respect of its properties, including, but not limited to, correctness
+ and/or fitness for purpose.
+ ---------------------------------------------------------------------------
+ Issue 09/09/2006
+
+ This is an AES implementation that uses only 8-bit byte operations on the
+ cipher state (there are options to use 32-bit types if available).
+
+ The combination of mix columns and byte substitution used here is based on
+ that developed by Karl Malbrain. His contribution is acknowledged.
+ */
+
+/* define if you have a fast memcpy function on your system */
+#if 0
+# define HAVE_MEMCPY
+# include <string.h>
+# if defined( _MSC_VER )
+# include <intrin.h>
+# pragma intrinsic( memcpy )
+# endif
+#endif
+
+
+#include <stdlib.h>
+#include <stdint.h>
+
+/* define if you have fast 32-bit types on your system */
+#if ( __CORTEX_M != 0 ) // if Cortex is different from M0/M0+
+# define HAVE_UINT_32T
+#endif
+
+/* define if you don't want any tables */
+#if 1
+# define USE_TABLES
+#endif
+
+/* On Intel Core 2 duo VERSION_1 is faster */
+
+/* alternative versions (test for performance on your system) */
+#if 1
+# define VERSION_1
+#endif
+
+#include "aes.h"
+
+//#if defined( HAVE_UINT_32T )
+// typedef unsigned long uint32_t;
+//#endif
+
+/* functions for finite field multiplication in the AES Galois field */
+
+#define WPOLY 0x011b
+#define BPOLY 0x1b
+#define DPOLY 0x008d
+
+#define f1(x) (x)
+#define f2(x) ((x << 1) ^ (((x >> 7) & 1) * WPOLY))
+#define f4(x) ((x << 2) ^ (((x >> 6) & 1) * WPOLY) ^ (((x >> 6) & 2) * WPOLY))
+#define f8(x) ((x << 3) ^ (((x >> 5) & 1) * WPOLY) ^ (((x >> 5) & 2) * WPOLY) \
+ ^ (((x >> 5) & 4) * WPOLY))
+#define d2(x) (((x) >> 1) ^ ((x) & 1 ? DPOLY : 0))
+
+#define f3(x) (f2(x) ^ x)
+#define f9(x) (f8(x) ^ x)
+#define fb(x) (f8(x) ^ f2(x) ^ x)
+#define fd(x) (f8(x) ^ f4(x) ^ x)
+#define fe(x) (f8(x) ^ f4(x) ^ f2(x))
+
+#if defined( USE_TABLES )
+
+#define sb_data(w) { /* S Box data values */ \
+ w(0x63), w(0x7c), w(0x77), w(0x7b), w(0xf2), w(0x6b), w(0x6f), w(0xc5),\
+ w(0x30), w(0x01), w(0x67), w(0x2b), w(0xfe), w(0xd7), w(0xab), w(0x76),\
+ w(0xca), w(0x82), w(0xc9), w(0x7d), w(0xfa), w(0x59), w(0x47), w(0xf0),\
+ w(0xad), w(0xd4), w(0xa2), w(0xaf), w(0x9c), w(0xa4), w(0x72), w(0xc0),\
+ w(0xb7), w(0xfd), w(0x93), w(0x26), w(0x36), w(0x3f), w(0xf7), w(0xcc),\
+ w(0x34), w(0xa5), w(0xe5), w(0xf1), w(0x71), w(0xd8), w(0x31), w(0x15),\
+ w(0x04), w(0xc7), w(0x23), w(0xc3), w(0x18), w(0x96), w(0x05), w(0x9a),\
+ w(0x07), w(0x12), w(0x80), w(0xe2), w(0xeb), w(0x27), w(0xb2), w(0x75),\
+ w(0x09), w(0x83), w(0x2c), w(0x1a), w(0x1b), w(0x6e), w(0x5a), w(0xa0),\
+ w(0x52), w(0x3b), w(0xd6), w(0xb3), w(0x29), w(0xe3), w(0x2f), w(0x84),\
+ w(0x53), w(0xd1), w(0x00), w(0xed), w(0x20), w(0xfc), w(0xb1), w(0x5b),\
+ w(0x6a), w(0xcb), w(0xbe), w(0x39), w(0x4a), w(0x4c), w(0x58), w(0xcf),\
+ w(0xd0), w(0xef), w(0xaa), w(0xfb), w(0x43), w(0x4d), w(0x33), w(0x85),\
+ w(0x45), w(0xf9), w(0x02), w(0x7f), w(0x50), w(0x3c), w(0x9f), w(0xa8),\
+ w(0x51), w(0xa3), w(0x40), w(0x8f), w(0x92), w(0x9d), w(0x38), w(0xf5),\
+ w(0xbc), w(0xb6), w(0xda), w(0x21), w(0x10), w(0xff), w(0xf3), w(0xd2),\
+ w(0xcd), w(0x0c), w(0x13), w(0xec), w(0x5f), w(0x97), w(0x44), w(0x17),\
+ w(0xc4), w(0xa7), w(0x7e), w(0x3d), w(0x64), w(0x5d), w(0x19), w(0x73),\
+ w(0x60), w(0x81), w(0x4f), w(0xdc), w(0x22), w(0x2a), w(0x90), w(0x88),\
+ w(0x46), w(0xee), w(0xb8), w(0x14), w(0xde), w(0x5e), w(0x0b), w(0xdb),\
+ w(0xe0), w(0x32), w(0x3a), w(0x0a), w(0x49), w(0x06), w(0x24), w(0x5c),\
+ w(0xc2), w(0xd3), w(0xac), w(0x62), w(0x91), w(0x95), w(0xe4), w(0x79),\
+ w(0xe7), w(0xc8), w(0x37), w(0x6d), w(0x8d), w(0xd5), w(0x4e), w(0xa9),\
+ w(0x6c), w(0x56), w(0xf4), w(0xea), w(0x65), w(0x7a), w(0xae), w(0x08),\
+ w(0xba), w(0x78), w(0x25), w(0x2e), w(0x1c), w(0xa6), w(0xb4), w(0xc6),\
+ w(0xe8), w(0xdd), w(0x74), w(0x1f), w(0x4b), w(0xbd), w(0x8b), w(0x8a),\
+ w(0x70), w(0x3e), w(0xb5), w(0x66), w(0x48), w(0x03), w(0xf6), w(0x0e),\
+ w(0x61), w(0x35), w(0x57), w(0xb9), w(0x86), w(0xc1), w(0x1d), w(0x9e),\
+ w(0xe1), w(0xf8), w(0x98), w(0x11), w(0x69), w(0xd9), w(0x8e), w(0x94),\
+ w(0x9b), w(0x1e), w(0x87), w(0xe9), w(0xce), w(0x55), w(0x28), w(0xdf),\
+ w(0x8c), w(0xa1), w(0x89), w(0x0d), w(0xbf), w(0xe6), w(0x42), w(0x68),\
+ w(0x41), w(0x99), w(0x2d), w(0x0f), w(0xb0), w(0x54), w(0xbb), w(0x16) }
+
+#define isb_data(w) { /* inverse S Box data values */ \
+ w(0x52), w(0x09), w(0x6a), w(0xd5), w(0x30), w(0x36), w(0xa5), w(0x38),\
+ w(0xbf), w(0x40), w(0xa3), w(0x9e), w(0x81), w(0xf3), w(0xd7), w(0xfb),\
+ w(0x7c), w(0xe3), w(0x39), w(0x82), w(0x9b), w(0x2f), w(0xff), w(0x87),\
+ w(0x34), w(0x8e), w(0x43), w(0x44), w(0xc4), w(0xde), w(0xe9), w(0xcb),\
+ w(0x54), w(0x7b), w(0x94), w(0x32), w(0xa6), w(0xc2), w(0x23), w(0x3d),\
+ w(0xee), w(0x4c), w(0x95), w(0x0b), w(0x42), w(0xfa), w(0xc3), w(0x4e),\
+ w(0x08), w(0x2e), w(0xa1), w(0x66), w(0x28), w(0xd9), w(0x24), w(0xb2),\
+ w(0x76), w(0x5b), w(0xa2), w(0x49), w(0x6d), w(0x8b), w(0xd1), w(0x25),\
+ w(0x72), w(0xf8), w(0xf6), w(0x64), w(0x86), w(0x68), w(0x98), w(0x16),\
+ w(0xd4), w(0xa4), w(0x5c), w(0xcc), w(0x5d), w(0x65), w(0xb6), w(0x92),\
+ w(0x6c), w(0x70), w(0x48), w(0x50), w(0xfd), w(0xed), w(0xb9), w(0xda),\
+ w(0x5e), w(0x15), w(0x46), w(0x57), w(0xa7), w(0x8d), w(0x9d), w(0x84),\
+ w(0x90), w(0xd8), w(0xab), w(0x00), w(0x8c), w(0xbc), w(0xd3), w(0x0a),\
+ w(0xf7), w(0xe4), w(0x58), w(0x05), w(0xb8), w(0xb3), w(0x45), w(0x06),\
+ w(0xd0), w(0x2c), w(0x1e), w(0x8f), w(0xca), w(0x3f), w(0x0f), w(0x02),\
+ w(0xc1), w(0xaf), w(0xbd), w(0x03), w(0x01), w(0x13), w(0x8a), w(0x6b),\
+ w(0x3a), w(0x91), w(0x11), w(0x41), w(0x4f), w(0x67), w(0xdc), w(0xea),\
+ w(0x97), w(0xf2), w(0xcf), w(0xce), w(0xf0), w(0xb4), w(0xe6), w(0x73),\
+ w(0x96), w(0xac), w(0x74), w(0x22), w(0xe7), w(0xad), w(0x35), w(0x85),\
+ w(0xe2), w(0xf9), w(0x37), w(0xe8), w(0x1c), w(0x75), w(0xdf), w(0x6e),\
+ w(0x47), w(0xf1), w(0x1a), w(0x71), w(0x1d), w(0x29), w(0xc5), w(0x89),\
+ w(0x6f), w(0xb7), w(0x62), w(0x0e), w(0xaa), w(0x18), w(0xbe), w(0x1b),\
+ w(0xfc), w(0x56), w(0x3e), w(0x4b), w(0xc6), w(0xd2), w(0x79), w(0x20),\
+ w(0x9a), w(0xdb), w(0xc0), w(0xfe), w(0x78), w(0xcd), w(0x5a), w(0xf4),\
+ w(0x1f), w(0xdd), w(0xa8), w(0x33), w(0x88), w(0x07), w(0xc7), w(0x31),\
+ w(0xb1), w(0x12), w(0x10), w(0x59), w(0x27), w(0x80), w(0xec), w(0x5f),\
+ w(0x60), w(0x51), w(0x7f), w(0xa9), w(0x19), w(0xb5), w(0x4a), w(0x0d),\
+ w(0x2d), w(0xe5), w(0x7a), w(0x9f), w(0x93), w(0xc9), w(0x9c), w(0xef),\
+ w(0xa0), w(0xe0), w(0x3b), w(0x4d), w(0xae), w(0x2a), w(0xf5), w(0xb0),\
+ w(0xc8), w(0xeb), w(0xbb), w(0x3c), w(0x83), w(0x53), w(0x99), w(0x61),\
+ w(0x17), w(0x2b), w(0x04), w(0x7e), w(0xba), w(0x77), w(0xd6), w(0x26),\
+ w(0xe1), w(0x69), w(0x14), w(0x63), w(0x55), w(0x21), w(0x0c), w(0x7d) }
+
+#define mm_data(w) { /* basic data for forming finite field tables */ \
+ w(0x00), w(0x01), w(0x02), w(0x03), w(0x04), w(0x05), w(0x06), w(0x07),\
+ w(0x08), w(0x09), w(0x0a), w(0x0b), w(0x0c), w(0x0d), w(0x0e), w(0x0f),\
+ w(0x10), w(0x11), w(0x12), w(0x13), w(0x14), w(0x15), w(0x16), w(0x17),\
+ w(0x18), w(0x19), w(0x1a), w(0x1b), w(0x1c), w(0x1d), w(0x1e), w(0x1f),\
+ w(0x20), w(0x21), w(0x22), w(0x23), w(0x24), w(0x25), w(0x26), w(0x27),\
+ w(0x28), w(0x29), w(0x2a), w(0x2b), w(0x2c), w(0x2d), w(0x2e), w(0x2f),\
+ w(0x30), w(0x31), w(0x32), w(0x33), w(0x34), w(0x35), w(0x36), w(0x37),\
+ w(0x38), w(0x39), w(0x3a), w(0x3b), w(0x3c), w(0x3d), w(0x3e), w(0x3f),\
+ w(0x40), w(0x41), w(0x42), w(0x43), w(0x44), w(0x45), w(0x46), w(0x47),\
+ w(0x48), w(0x49), w(0x4a), w(0x4b), w(0x4c), w(0x4d), w(0x4e), w(0x4f),\
+ w(0x50), w(0x51), w(0x52), w(0x53), w(0x54), w(0x55), w(0x56), w(0x57),\
+ w(0x58), w(0x59), w(0x5a), w(0x5b), w(0x5c), w(0x5d), w(0x5e), w(0x5f),\
+ w(0x60), w(0x61), w(0x62), w(0x63), w(0x64), w(0x65), w(0x66), w(0x67),\
+ w(0x68), w(0x69), w(0x6a), w(0x6b), w(0x6c), w(0x6d), w(0x6e), w(0x6f),\
+ w(0x70), w(0x71), w(0x72), w(0x73), w(0x74), w(0x75), w(0x76), w(0x77),\
+ w(0x78), w(0x79), w(0x7a), w(0x7b), w(0x7c), w(0x7d), w(0x7e), w(0x7f),\
+ w(0x80), w(0x81), w(0x82), w(0x83), w(0x84), w(0x85), w(0x86), w(0x87),\
+ w(0x88), w(0x89), w(0x8a), w(0x8b), w(0x8c), w(0x8d), w(0x8e), w(0x8f),\
+ w(0x90), w(0x91), w(0x92), w(0x93), w(0x94), w(0x95), w(0x96), w(0x97),\
+ w(0x98), w(0x99), w(0x9a), w(0x9b), w(0x9c), w(0x9d), w(0x9e), w(0x9f),\
+ w(0xa0), w(0xa1), w(0xa2), w(0xa3), w(0xa4), w(0xa5), w(0xa6), w(0xa7),\
+ w(0xa8), w(0xa9), w(0xaa), w(0xab), w(0xac), w(0xad), w(0xae), w(0xaf),\
+ w(0xb0), w(0xb1), w(0xb2), w(0xb3), w(0xb4), w(0xb5), w(0xb6), w(0xb7),\
+ w(0xb8), w(0xb9), w(0xba), w(0xbb), w(0xbc), w(0xbd), w(0xbe), w(0xbf),\
+ w(0xc0), w(0xc1), w(0xc2), w(0xc3), w(0xc4), w(0xc5), w(0xc6), w(0xc7),\
+ w(0xc8), w(0xc9), w(0xca), w(0xcb), w(0xcc), w(0xcd), w(0xce), w(0xcf),\
+ w(0xd0), w(0xd1), w(0xd2), w(0xd3), w(0xd4), w(0xd5), w(0xd6), w(0xd7),\
+ w(0xd8), w(0xd9), w(0xda), w(0xdb), w(0xdc), w(0xdd), w(0xde), w(0xdf),\
+ w(0xe0), w(0xe1), w(0xe2), w(0xe3), w(0xe4), w(0xe5), w(0xe6), w(0xe7),\
+ w(0xe8), w(0xe9), w(0xea), w(0xeb), w(0xec), w(0xed), w(0xee), w(0xef),\
+ w(0xf0), w(0xf1), w(0xf2), w(0xf3), w(0xf4), w(0xf5), w(0xf6), w(0xf7),\
+ w(0xf8), w(0xf9), w(0xfa), w(0xfb), w(0xfc), w(0xfd), w(0xfe), w(0xff) }
+
+static const uint8_t sbox[256] = sb_data(f1);
+
+#if defined( AES_DEC_PREKEYED )
+static const uint8_t isbox[256] = isb_data(f1);
+#endif
+
+static const uint8_t gfm2_sbox[256] = sb_data(f2);
+static const uint8_t gfm3_sbox[256] = sb_data(f3);
+
+#if defined( AES_DEC_PREKEYED )
+static const uint8_t gfmul_9[256] = mm_data(f9);
+static const uint8_t gfmul_b[256] = mm_data(fb);
+static const uint8_t gfmul_d[256] = mm_data(fd);
+static const uint8_t gfmul_e[256] = mm_data(fe);
+#endif
+
+#define s_box(x) sbox[(x)]
+#if defined( AES_DEC_PREKEYED )
+#define is_box(x) isbox[(x)]
+#endif
+#define gfm2_sb(x) gfm2_sbox[(x)]
+#define gfm3_sb(x) gfm3_sbox[(x)]
+#if defined( AES_DEC_PREKEYED )
+#define gfm_9(x) gfmul_9[(x)]
+#define gfm_b(x) gfmul_b[(x)]
+#define gfm_d(x) gfmul_d[(x)]
+#define gfm_e(x) gfmul_e[(x)]
+#endif
+#else
+
+/* this is the high bit of x right shifted by 1 */
+/* position. Since the starting polynomial has */
+/* 9 bits (0x11b), this right shift keeps the */
+/* values of all top bits within a byte */
+
+static uint8_t hibit(const uint8_t x)
+{ uint8_t r = (uint8_t)((x >> 1) | (x >> 2));
+
+ r |= (r >> 2);
+ r |= (r >> 4);
+ return (r + 1) >> 1;
+}
+
+/* return the inverse of the finite field element x */
+
+static uint8_t gf_inv(const uint8_t x)
+{ uint8_t p1 = x, p2 = BPOLY, n1 = hibit(x), n2 = 0x80, v1 = 1, v2 = 0;
+
+ if(x < 2)
+ return x;
+
+ for( ; ; )
+ {
+ if(n1)
+ while(n2 >= n1) /* divide polynomial p2 by p1 */
+ {
+ n2 /= n1; /* shift smaller polynomial left */
+ p2 ^= (p1 * n2) & 0xff; /* and remove from larger one */
+ v2 ^= (v1 * n2); /* shift accumulated value and */
+ n2 = hibit(p2); /* add into result */
+ }
+ else
+ return v1;
+
+ if(n2) /* repeat with values swapped */
+ while(n1 >= n2)
+ {
+ n1 /= n2;
+ p1 ^= p2 * n1;
+ v1 ^= v2 * n1;
+ n1 = hibit(p1);
+ }
+ else
+ return v2;
+ }
+}
+
+/* The forward and inverse affine transformations used in the S-box */
+uint8_t fwd_affine(const uint8_t x)
+{
+#if defined( HAVE_UINT_32T )
+ uint32_t w = x;
+ w ^= (w << 1) ^ (w << 2) ^ (w << 3) ^ (w << 4);
+ return 0x63 ^ ((w ^ (w >> 8)) & 0xff);
+#else
+ return 0x63 ^ x ^ (x << 1) ^ (x << 2) ^ (x << 3) ^ (x << 4)
+ ^ (x >> 7) ^ (x >> 6) ^ (x >> 5) ^ (x >> 4);
+#endif
+}
+
+uint8_t inv_affine(const uint8_t x)
+{
+#if defined( HAVE_UINT_32T )
+ uint32_t w = x;
+ w = (w << 1) ^ (w << 3) ^ (w << 6);
+ return 0x05 ^ ((w ^ (w >> 8)) & 0xff);
+#else
+ return 0x05 ^ (x << 1) ^ (x << 3) ^ (x << 6)
+ ^ (x >> 7) ^ (x >> 5) ^ (x >> 2);
+#endif
+}
+
+#define s_box(x) fwd_affine(gf_inv(x))
+#define is_box(x) gf_inv(inv_affine(x))
+#define gfm2_sb(x) f2(s_box(x))
+#define gfm3_sb(x) f3(s_box(x))
+#define gfm_9(x) f9(x)
+#define gfm_b(x) fb(x)
+#define gfm_d(x) fd(x)
+#define gfm_e(x) fe(x)
+
+#endif
+
+#if defined( HAVE_MEMCPY )
+# define block_copy_nn(d, s, l) memcpy(d, s, l)
+# define block_copy(d, s) memcpy(d, s, N_BLOCK)
+#else
+# define block_copy_nn(d, s, l) copy_block_nn(d, s, l)
+# define block_copy(d, s) copy_block(d, s)
+#endif
+
+static void copy_block( void *d, const void *s )
+{
+#if defined( HAVE_UINT_32T )
+ ((uint32_t*)d)[ 0] = ((uint32_t*)s)[ 0];
+ ((uint32_t*)d)[ 1] = ((uint32_t*)s)[ 1];
+ ((uint32_t*)d)[ 2] = ((uint32_t*)s)[ 2];
+ ((uint32_t*)d)[ 3] = ((uint32_t*)s)[ 3];
+#else
+ ((uint8_t*)d)[ 0] = ((uint8_t*)s)[ 0];
+ ((uint8_t*)d)[ 1] = ((uint8_t*)s)[ 1];
+ ((uint8_t*)d)[ 2] = ((uint8_t*)s)[ 2];
+ ((uint8_t*)d)[ 3] = ((uint8_t*)s)[ 3];
+ ((uint8_t*)d)[ 4] = ((uint8_t*)s)[ 4];
+ ((uint8_t*)d)[ 5] = ((uint8_t*)s)[ 5];
+ ((uint8_t*)d)[ 6] = ((uint8_t*)s)[ 6];
+ ((uint8_t*)d)[ 7] = ((uint8_t*)s)[ 7];
+ ((uint8_t*)d)[ 8] = ((uint8_t*)s)[ 8];
+ ((uint8_t*)d)[ 9] = ((uint8_t*)s)[ 9];
+ ((uint8_t*)d)[10] = ((uint8_t*)s)[10];
+ ((uint8_t*)d)[11] = ((uint8_t*)s)[11];
+ ((uint8_t*)d)[12] = ((uint8_t*)s)[12];
+ ((uint8_t*)d)[13] = ((uint8_t*)s)[13];
+ ((uint8_t*)d)[14] = ((uint8_t*)s)[14];
+ ((uint8_t*)d)[15] = ((uint8_t*)s)[15];
+#endif
+}
+
+static void copy_block_nn( uint8_t * d, const uint8_t *s, uint8_t nn )
+{
+ while( nn-- )
+ //*((uint8_t*)d)++ = *((uint8_t*)s)++;
+ *d++ = *s++;
+}
+
+static void xor_block( void *d, const void *s )
+{
+#if defined( HAVE_UINT_32T )
+ ((uint32_t*)d)[ 0] ^= ((uint32_t*)s)[ 0];
+ ((uint32_t*)d)[ 1] ^= ((uint32_t*)s)[ 1];
+ ((uint32_t*)d)[ 2] ^= ((uint32_t*)s)[ 2];
+ ((uint32_t*)d)[ 3] ^= ((uint32_t*)s)[ 3];
+#else
+ ((uint8_t*)d)[ 0] ^= ((uint8_t*)s)[ 0];
+ ((uint8_t*)d)[ 1] ^= ((uint8_t*)s)[ 1];
+ ((uint8_t*)d)[ 2] ^= ((uint8_t*)s)[ 2];
+ ((uint8_t*)d)[ 3] ^= ((uint8_t*)s)[ 3];
+ ((uint8_t*)d)[ 4] ^= ((uint8_t*)s)[ 4];
+ ((uint8_t*)d)[ 5] ^= ((uint8_t*)s)[ 5];
+ ((uint8_t*)d)[ 6] ^= ((uint8_t*)s)[ 6];
+ ((uint8_t*)d)[ 7] ^= ((uint8_t*)s)[ 7];
+ ((uint8_t*)d)[ 8] ^= ((uint8_t*)s)[ 8];
+ ((uint8_t*)d)[ 9] ^= ((uint8_t*)s)[ 9];
+ ((uint8_t*)d)[10] ^= ((uint8_t*)s)[10];
+ ((uint8_t*)d)[11] ^= ((uint8_t*)s)[11];
+ ((uint8_t*)d)[12] ^= ((uint8_t*)s)[12];
+ ((uint8_t*)d)[13] ^= ((uint8_t*)s)[13];
+ ((uint8_t*)d)[14] ^= ((uint8_t*)s)[14];
+ ((uint8_t*)d)[15] ^= ((uint8_t*)s)[15];
+#endif
+}
+
+static void copy_and_key( void *d, const void *s, const void *k )
+{
+#if defined( HAVE_UINT_32T )
+ ((uint32_t*)d)[ 0] = ((uint32_t*)s)[ 0] ^ ((uint32_t*)k)[ 0];
+ ((uint32_t*)d)[ 1] = ((uint32_t*)s)[ 1] ^ ((uint32_t*)k)[ 1];
+ ((uint32_t*)d)[ 2] = ((uint32_t*)s)[ 2] ^ ((uint32_t*)k)[ 2];
+ ((uint32_t*)d)[ 3] = ((uint32_t*)s)[ 3] ^ ((uint32_t*)k)[ 3];
+#elif 1
+ ((uint8_t*)d)[ 0] = ((uint8_t*)s)[ 0] ^ ((uint8_t*)k)[ 0];
+ ((uint8_t*)d)[ 1] = ((uint8_t*)s)[ 1] ^ ((uint8_t*)k)[ 1];
+ ((uint8_t*)d)[ 2] = ((uint8_t*)s)[ 2] ^ ((uint8_t*)k)[ 2];
+ ((uint8_t*)d)[ 3] = ((uint8_t*)s)[ 3] ^ ((uint8_t*)k)[ 3];
+ ((uint8_t*)d)[ 4] = ((uint8_t*)s)[ 4] ^ ((uint8_t*)k)[ 4];
+ ((uint8_t*)d)[ 5] = ((uint8_t*)s)[ 5] ^ ((uint8_t*)k)[ 5];
+ ((uint8_t*)d)[ 6] = ((uint8_t*)s)[ 6] ^ ((uint8_t*)k)[ 6];
+ ((uint8_t*)d)[ 7] = ((uint8_t*)s)[ 7] ^ ((uint8_t*)k)[ 7];
+ ((uint8_t*)d)[ 8] = ((uint8_t*)s)[ 8] ^ ((uint8_t*)k)[ 8];
+ ((uint8_t*)d)[ 9] = ((uint8_t*)s)[ 9] ^ ((uint8_t*)k)[ 9];
+ ((uint8_t*)d)[10] = ((uint8_t*)s)[10] ^ ((uint8_t*)k)[10];
+ ((uint8_t*)d)[11] = ((uint8_t*)s)[11] ^ ((uint8_t*)k)[11];
+ ((uint8_t*)d)[12] = ((uint8_t*)s)[12] ^ ((uint8_t*)k)[12];
+ ((uint8_t*)d)[13] = ((uint8_t*)s)[13] ^ ((uint8_t*)k)[13];
+ ((uint8_t*)d)[14] = ((uint8_t*)s)[14] ^ ((uint8_t*)k)[14];
+ ((uint8_t*)d)[15] = ((uint8_t*)s)[15] ^ ((uint8_t*)k)[15];
+#else
+ block_copy(d, s);
+ xor_block(d, k);
+#endif
+}
+
+static void add_round_key( uint8_t d[N_BLOCK], const uint8_t k[N_BLOCK] )
+{
+ xor_block(d, k);
+}
+
+static void shift_sub_rows( uint8_t st[N_BLOCK] )
+{ uint8_t tt;
+
+ st[ 0] = s_box(st[ 0]); st[ 4] = s_box(st[ 4]);
+ st[ 8] = s_box(st[ 8]); st[12] = s_box(st[12]);
+
+ tt = st[1]; st[ 1] = s_box(st[ 5]); st[ 5] = s_box(st[ 9]);
+ st[ 9] = s_box(st[13]); st[13] = s_box( tt );
+
+ tt = st[2]; st[ 2] = s_box(st[10]); st[10] = s_box( tt );
+ tt = st[6]; st[ 6] = s_box(st[14]); st[14] = s_box( tt );
+
+ tt = st[15]; st[15] = s_box(st[11]); st[11] = s_box(st[ 7]);
+ st[ 7] = s_box(st[ 3]); st[ 3] = s_box( tt );
+}
+
+#if defined( AES_DEC_PREKEYED )
+
+static void inv_shift_sub_rows( uint8_t st[N_BLOCK] )
+{ uint8_t tt;
+
+ st[ 0] = is_box(st[ 0]); st[ 4] = is_box(st[ 4]);
+ st[ 8] = is_box(st[ 8]); st[12] = is_box(st[12]);
+
+ tt = st[13]; st[13] = is_box(st[9]); st[ 9] = is_box(st[5]);
+ st[ 5] = is_box(st[1]); st[ 1] = is_box( tt );
+
+ tt = st[2]; st[ 2] = is_box(st[10]); st[10] = is_box( tt );
+ tt = st[6]; st[ 6] = is_box(st[14]); st[14] = is_box( tt );
+
+ tt = st[3]; st[ 3] = is_box(st[ 7]); st[ 7] = is_box(st[11]);
+ st[11] = is_box(st[15]); st[15] = is_box( tt );
+}
+
+#endif
+
+#if defined( VERSION_1 )
+ static void mix_sub_columns( uint8_t dt[N_BLOCK] )
+ { uint8_t st[N_BLOCK];
+ block_copy(st, dt);
+#else
+ static void mix_sub_columns( uint8_t dt[N_BLOCK], uint8_t st[N_BLOCK] )
+ {
+#endif
+ dt[ 0] = gfm2_sb(st[0]) ^ gfm3_sb(st[5]) ^ s_box(st[10]) ^ s_box(st[15]);
+ dt[ 1] = s_box(st[0]) ^ gfm2_sb(st[5]) ^ gfm3_sb(st[10]) ^ s_box(st[15]);
+ dt[ 2] = s_box(st[0]) ^ s_box(st[5]) ^ gfm2_sb(st[10]) ^ gfm3_sb(st[15]);
+ dt[ 3] = gfm3_sb(st[0]) ^ s_box(st[5]) ^ s_box(st[10]) ^ gfm2_sb(st[15]);
+
+ dt[ 4] = gfm2_sb(st[4]) ^ gfm3_sb(st[9]) ^ s_box(st[14]) ^ s_box(st[3]);
+ dt[ 5] = s_box(st[4]) ^ gfm2_sb(st[9]) ^ gfm3_sb(st[14]) ^ s_box(st[3]);
+ dt[ 6] = s_box(st[4]) ^ s_box(st[9]) ^ gfm2_sb(st[14]) ^ gfm3_sb(st[3]);
+ dt[ 7] = gfm3_sb(st[4]) ^ s_box(st[9]) ^ s_box(st[14]) ^ gfm2_sb(st[3]);
+
+ dt[ 8] = gfm2_sb(st[8]) ^ gfm3_sb(st[13]) ^ s_box(st[2]) ^ s_box(st[7]);
+ dt[ 9] = s_box(st[8]) ^ gfm2_sb(st[13]) ^ gfm3_sb(st[2]) ^ s_box(st[7]);
+ dt[10] = s_box(st[8]) ^ s_box(st[13]) ^ gfm2_sb(st[2]) ^ gfm3_sb(st[7]);
+ dt[11] = gfm3_sb(st[8]) ^ s_box(st[13]) ^ s_box(st[2]) ^ gfm2_sb(st[7]);
+
+ dt[12] = gfm2_sb(st[12]) ^ gfm3_sb(st[1]) ^ s_box(st[6]) ^ s_box(st[11]);
+ dt[13] = s_box(st[12]) ^ gfm2_sb(st[1]) ^ gfm3_sb(st[6]) ^ s_box(st[11]);
+ dt[14] = s_box(st[12]) ^ s_box(st[1]) ^ gfm2_sb(st[6]) ^ gfm3_sb(st[11]);
+ dt[15] = gfm3_sb(st[12]) ^ s_box(st[1]) ^ s_box(st[6]) ^ gfm2_sb(st[11]);
+ }
+
+#if defined( AES_DEC_PREKEYED )
+
+#if defined( VERSION_1 )
+ static void inv_mix_sub_columns( uint8_t dt[N_BLOCK] )
+ { uint8_t st[N_BLOCK];
+ block_copy(st, dt);
+#else
+ static void inv_mix_sub_columns( uint8_t dt[N_BLOCK], uint8_t st[N_BLOCK] )
+ {
+#endif
+ dt[ 0] = is_box(gfm_e(st[ 0]) ^ gfm_b(st[ 1]) ^ gfm_d(st[ 2]) ^ gfm_9(st[ 3]));
+ dt[ 5] = is_box(gfm_9(st[ 0]) ^ gfm_e(st[ 1]) ^ gfm_b(st[ 2]) ^ gfm_d(st[ 3]));
+ dt[10] = is_box(gfm_d(st[ 0]) ^ gfm_9(st[ 1]) ^ gfm_e(st[ 2]) ^ gfm_b(st[ 3]));
+ dt[15] = is_box(gfm_b(st[ 0]) ^ gfm_d(st[ 1]) ^ gfm_9(st[ 2]) ^ gfm_e(st[ 3]));
+
+ dt[ 4] = is_box(gfm_e(st[ 4]) ^ gfm_b(st[ 5]) ^ gfm_d(st[ 6]) ^ gfm_9(st[ 7]));
+ dt[ 9] = is_box(gfm_9(st[ 4]) ^ gfm_e(st[ 5]) ^ gfm_b(st[ 6]) ^ gfm_d(st[ 7]));
+ dt[14] = is_box(gfm_d(st[ 4]) ^ gfm_9(st[ 5]) ^ gfm_e(st[ 6]) ^ gfm_b(st[ 7]));
+ dt[ 3] = is_box(gfm_b(st[ 4]) ^ gfm_d(st[ 5]) ^ gfm_9(st[ 6]) ^ gfm_e(st[ 7]));
+
+ dt[ 8] = is_box(gfm_e(st[ 8]) ^ gfm_b(st[ 9]) ^ gfm_d(st[10]) ^ gfm_9(st[11]));
+ dt[13] = is_box(gfm_9(st[ 8]) ^ gfm_e(st[ 9]) ^ gfm_b(st[10]) ^ gfm_d(st[11]));
+ dt[ 2] = is_box(gfm_d(st[ 8]) ^ gfm_9(st[ 9]) ^ gfm_e(st[10]) ^ gfm_b(st[11]));
+ dt[ 7] = is_box(gfm_b(st[ 8]) ^ gfm_d(st[ 9]) ^ gfm_9(st[10]) ^ gfm_e(st[11]));
+
+ dt[12] = is_box(gfm_e(st[12]) ^ gfm_b(st[13]) ^ gfm_d(st[14]) ^ gfm_9(st[15]));
+ dt[ 1] = is_box(gfm_9(st[12]) ^ gfm_e(st[13]) ^ gfm_b(st[14]) ^ gfm_d(st[15]));
+ dt[ 6] = is_box(gfm_d(st[12]) ^ gfm_9(st[13]) ^ gfm_e(st[14]) ^ gfm_b(st[15]));
+ dt[11] = is_box(gfm_b(st[12]) ^ gfm_d(st[13]) ^ gfm_9(st[14]) ^ gfm_e(st[15]));
+ }
+
+#endif
+
+#if defined( AES_ENC_PREKEYED ) || defined( AES_DEC_PREKEYED )
+
+/* Set the cipher key for the pre-keyed version */
+
+return_type aes_set_key( const uint8_t key[], length_type keylen, aes_context ctx[1] )
+{
+ uint8_t cc, rc, hi;
+
+ switch( keylen )
+ {
+ case 16:
+ case 24:
+ case 32:
+ break;
+ default:
+ ctx->rnd = 0;
+ return ( uint8_t )-1;
+ }
+ block_copy_nn(ctx->ksch, key, keylen);
+ hi = (keylen + 28) << 2;
+ ctx->rnd = (hi >> 4) - 1;
+ for( cc = keylen, rc = 1; cc < hi; cc += 4 )
+ { uint8_t tt, t0, t1, t2, t3;
+
+ t0 = ctx->ksch[cc - 4];
+ t1 = ctx->ksch[cc - 3];
+ t2 = ctx->ksch[cc - 2];
+ t3 = ctx->ksch[cc - 1];
+ if( cc % keylen == 0 )
+ {
+ tt = t0;
+ t0 = s_box(t1) ^ rc;
+ t1 = s_box(t2);
+ t2 = s_box(t3);
+ t3 = s_box(tt);
+ rc = f2(rc);
+ }
+ else if( keylen > 24 && cc % keylen == 16 )
+ {
+ t0 = s_box(t0);
+ t1 = s_box(t1);
+ t2 = s_box(t2);
+ t3 = s_box(t3);
+ }
+ tt = cc - keylen;
+ ctx->ksch[cc + 0] = ctx->ksch[tt + 0] ^ t0;
+ ctx->ksch[cc + 1] = ctx->ksch[tt + 1] ^ t1;
+ ctx->ksch[cc + 2] = ctx->ksch[tt + 2] ^ t2;
+ ctx->ksch[cc + 3] = ctx->ksch[tt + 3] ^ t3;
+ }
+ return 0;
+}
+
+#endif
+
+#if defined( AES_ENC_PREKEYED )
+
+/* Encrypt a single block of 16 bytes */
+
+return_type aes_encrypt( const uint8_t in[N_BLOCK], uint8_t out[N_BLOCK], const aes_context ctx[1] )
+{
+ if( ctx->rnd )
+ {
+ uint8_t s1[N_BLOCK], r;
+ copy_and_key( s1, in, ctx->ksch );
+
+ for( r = 1 ; r < ctx->rnd ; ++r )
+#if defined( VERSION_1 )
+ {
+ mix_sub_columns( s1 );
+ add_round_key( s1, ctx->ksch + r * N_BLOCK);
+ }
+#else
+ { uint8_t s2[N_BLOCK];
+ mix_sub_columns( s2, s1 );
+ copy_and_key( s1, s2, ctx->ksch + r * N_BLOCK);
+ }
+#endif
+ shift_sub_rows( s1 );
+ copy_and_key( out, s1, ctx->ksch + r * N_BLOCK );
+ }
+ else
+ return ( uint8_t )-1;
+ return 0;
+}
+
+/* CBC encrypt a number of blocks (input and return an IV) */
+
+return_type aes_cbc_encrypt( const uint8_t *in, uint8_t *out,
+ int32_t n_block, uint8_t iv[N_BLOCK], const aes_context ctx[1] )
+{
+
+ while(n_block--)
+ {
+ xor_block(iv, in);
+ if(aes_encrypt(iv, iv, ctx) != EXIT_SUCCESS)
+ return EXIT_FAILURE;
+ //memcpy(out, iv, N_BLOCK);
+ block_copy(out, iv);
+ in += N_BLOCK;
+ out += N_BLOCK;
+ }
+ return EXIT_SUCCESS;
+}
+
+#endif
+
+#if defined( AES_DEC_PREKEYED )
+
+/* Decrypt a single block of 16 bytes */
+
+return_type aes_decrypt( const uint8_t in[N_BLOCK], uint8_t out[N_BLOCK], const aes_context ctx[1] )
+{
+ if( ctx->rnd )
+ {
+ uint8_t s1[N_BLOCK], r;
+ copy_and_key( s1, in, ctx->ksch + ctx->rnd * N_BLOCK );
+ inv_shift_sub_rows( s1 );
+
+ for( r = ctx->rnd ; --r ; )
+#if defined( VERSION_1 )
+ {
+ add_round_key( s1, ctx->ksch + r * N_BLOCK );
+ inv_mix_sub_columns( s1 );
+ }
+#else
+ { uint8_t s2[N_BLOCK];
+ copy_and_key( s2, s1, ctx->ksch + r * N_BLOCK );
+ inv_mix_sub_columns( s1, s2 );
+ }
+#endif
+ copy_and_key( out, s1, ctx->ksch );
+ }
+ else
+ return -1;
+ return 0;
+}
+
+/* CBC decrypt a number of blocks (input and return an IV) */
+
+return_type aes_cbc_decrypt( const uint8_t *in, uint8_t *out,
+ int32_t n_block, uint8_t iv[N_BLOCK], const aes_context ctx[1] )
+{
+ while(n_block--)
+ { uint8_t tmp[N_BLOCK];
+
+ //memcpy(tmp, in, N_BLOCK);
+ block_copy(tmp, in);
+ if(aes_decrypt(in, out, ctx) != EXIT_SUCCESS)
+ return EXIT_FAILURE;
+ xor_block(out, iv);
+ //memcpy(iv, tmp, N_BLOCK);
+ block_copy(iv, tmp);
+ in += N_BLOCK;
+ out += N_BLOCK;
+ }
+ return EXIT_SUCCESS;
+}
+
+#endif
+
+#if defined( AES_ENC_128_OTFK )
+
+/* The 'on the fly' encryption key update for for 128 bit keys */
+
+static void update_encrypt_key_128( uint8_t k[N_BLOCK], uint8_t *rc )
+{ uint8_t cc;
+
+ k[0] ^= s_box(k[13]) ^ *rc;
+ k[1] ^= s_box(k[14]);
+ k[2] ^= s_box(k[15]);
+ k[3] ^= s_box(k[12]);
+ *rc = f2( *rc );
+
+ for(cc = 4; cc < 16; cc += 4 )
+ {
+ k[cc + 0] ^= k[cc - 4];
+ k[cc + 1] ^= k[cc - 3];
+ k[cc + 2] ^= k[cc - 2];
+ k[cc + 3] ^= k[cc - 1];
+ }
+}
+
+/* Encrypt a single block of 16 bytes with 'on the fly' 128 bit keying */
+
+void aes_encrypt_128( const uint8_t in[N_BLOCK], uint8_t out[N_BLOCK],
+ const uint8_t key[N_BLOCK], uint8_t o_key[N_BLOCK] )
+{ uint8_t s1[N_BLOCK], r, rc = 1;
+
+ if(o_key != key)
+ block_copy( o_key, key );
+ copy_and_key( s1, in, o_key );
+
+ for( r = 1 ; r < 10 ; ++r )
+#if defined( VERSION_1 )
+ {
+ mix_sub_columns( s1 );
+ update_encrypt_key_128( o_key, &rc );
+ add_round_key( s1, o_key );
+ }
+#else
+ { uint8_t s2[N_BLOCK];
+ mix_sub_columns( s2, s1 );
+ update_encrypt_key_128( o_key, &rc );
+ copy_and_key( s1, s2, o_key );
+ }
+#endif
+
+ shift_sub_rows( s1 );
+ update_encrypt_key_128( o_key, &rc );
+ copy_and_key( out, s1, o_key );
+}
+
+#endif
+
+#if defined( AES_DEC_128_OTFK )
+
+/* The 'on the fly' decryption key update for for 128 bit keys */
+
+static void update_decrypt_key_128( uint8_t k[N_BLOCK], uint8_t *rc )
+{ uint8_t cc;
+
+ for( cc = 12; cc > 0; cc -= 4 )
+ {
+ k[cc + 0] ^= k[cc - 4];
+ k[cc + 1] ^= k[cc - 3];
+ k[cc + 2] ^= k[cc - 2];
+ k[cc + 3] ^= k[cc - 1];
+ }
+ *rc = d2(*rc);
+ k[0] ^= s_box(k[13]) ^ *rc;
+ k[1] ^= s_box(k[14]);
+ k[2] ^= s_box(k[15]);
+ k[3] ^= s_box(k[12]);
+}
+
+/* Decrypt a single block of 16 bytes with 'on the fly' 128 bit keying */
+
+void aes_decrypt_128( const uint8_t in[N_BLOCK], uint8_t out[N_BLOCK],
+ const uint8_t key[N_BLOCK], uint8_t o_key[N_BLOCK] )
+{
+ uint8_t s1[N_BLOCK], r, rc = 0x6c;
+ if(o_key != key)
+ block_copy( o_key, key );
+
+ copy_and_key( s1, in, o_key );
+ inv_shift_sub_rows( s1 );
+
+ for( r = 10 ; --r ; )
+#if defined( VERSION_1 )
+ {
+ update_decrypt_key_128( o_key, &rc );
+ add_round_key( s1, o_key );
+ inv_mix_sub_columns( s1 );
+ }
+#else
+ { uint8_t s2[N_BLOCK];
+ update_decrypt_key_128( o_key, &rc );
+ copy_and_key( s2, s1, o_key );
+ inv_mix_sub_columns( s1, s2 );
+ }
+#endif
+ update_decrypt_key_128( o_key, &rc );
+ copy_and_key( out, s1, o_key );
+}
+
+#endif
+
+#if defined( AES_ENC_256_OTFK )
+
+/* The 'on the fly' encryption key update for for 256 bit keys */
+
+static void update_encrypt_key_256( uint8_t k[2 * N_BLOCK], uint8_t *rc )
+{ uint8_t cc;
+
+ k[0] ^= s_box(k[29]) ^ *rc;
+ k[1] ^= s_box(k[30]);
+ k[2] ^= s_box(k[31]);
+ k[3] ^= s_box(k[28]);
+ *rc = f2( *rc );
+
+ for(cc = 4; cc < 16; cc += 4)
+ {
+ k[cc + 0] ^= k[cc - 4];
+ k[cc + 1] ^= k[cc - 3];
+ k[cc + 2] ^= k[cc - 2];
+ k[cc + 3] ^= k[cc - 1];
+ }
+
+ k[16] ^= s_box(k[12]);
+ k[17] ^= s_box(k[13]);
+ k[18] ^= s_box(k[14]);
+ k[19] ^= s_box(k[15]);
+
+ for( cc = 20; cc < 32; cc += 4 )
+ {
+ k[cc + 0] ^= k[cc - 4];
+ k[cc + 1] ^= k[cc - 3];
+ k[cc + 2] ^= k[cc - 2];
+ k[cc + 3] ^= k[cc - 1];
+ }
+}
+
+/* Encrypt a single block of 16 bytes with 'on the fly' 256 bit keying */
+
+void aes_encrypt_256( const uint8_t in[N_BLOCK], uint8_t out[N_BLOCK],
+ const uint8_t key[2 * N_BLOCK], uint8_t o_key[2 * N_BLOCK] )
+{
+ uint8_t s1[N_BLOCK], r, rc = 1;
+ if(o_key != key)
+ {
+ block_copy( o_key, key );
+ block_copy( o_key + 16, key + 16 );
+ }
+ copy_and_key( s1, in, o_key );
+
+ for( r = 1 ; r < 14 ; ++r )
+#if defined( VERSION_1 )
+ {
+ mix_sub_columns(s1);
+ if( r & 1 )
+ add_round_key( s1, o_key + 16 );
+ else
+ {
+ update_encrypt_key_256( o_key, &rc );
+ add_round_key( s1, o_key );
+ }
+ }
+#else
+ { uint8_t s2[N_BLOCK];
+ mix_sub_columns( s2, s1 );
+ if( r & 1 )
+ copy_and_key( s1, s2, o_key + 16 );
+ else
+ {
+ update_encrypt_key_256( o_key, &rc );
+ copy_and_key( s1, s2, o_key );
+ }
+ }
+#endif
+
+ shift_sub_rows( s1 );
+ update_encrypt_key_256( o_key, &rc );
+ copy_and_key( out, s1, o_key );
+}
+
+#endif
+
+#if defined( AES_DEC_256_OTFK )
+
+/* The 'on the fly' encryption key update for for 256 bit keys */
+
+static void update_decrypt_key_256( uint8_t k[2 * N_BLOCK], uint8_t *rc )
+{ uint8_t cc;
+
+ for(cc = 28; cc > 16; cc -= 4)
+ {
+ k[cc + 0] ^= k[cc - 4];
+ k[cc + 1] ^= k[cc - 3];
+ k[cc + 2] ^= k[cc - 2];
+ k[cc + 3] ^= k[cc - 1];
+ }
+
+ k[16] ^= s_box(k[12]);
+ k[17] ^= s_box(k[13]);
+ k[18] ^= s_box(k[14]);
+ k[19] ^= s_box(k[15]);
+
+ for(cc = 12; cc > 0; cc -= 4)
+ {
+ k[cc + 0] ^= k[cc - 4];
+ k[cc + 1] ^= k[cc - 3];
+ k[cc + 2] ^= k[cc - 2];
+ k[cc + 3] ^= k[cc - 1];
+ }
+
+ *rc = d2(*rc);
+ k[0] ^= s_box(k[29]) ^ *rc;
+ k[1] ^= s_box(k[30]);
+ k[2] ^= s_box(k[31]);
+ k[3] ^= s_box(k[28]);
+}
+
+/* Decrypt a single block of 16 bytes with 'on the fly'
+ 256 bit keying
+*/
+void aes_decrypt_256( const uint8_t in[N_BLOCK], uint8_t out[N_BLOCK],
+ const uint8_t key[2 * N_BLOCK], uint8_t o_key[2 * N_BLOCK] )
+{
+ uint8_t s1[N_BLOCK], r, rc = 0x80;
+
+ if(o_key != key)
+ {
+ block_copy( o_key, key );
+ block_copy( o_key + 16, key + 16 );
+ }
+
+ copy_and_key( s1, in, o_key );
+ inv_shift_sub_rows( s1 );
+
+ for( r = 14 ; --r ; )
+#if defined( VERSION_1 )
+ {
+ if( ( r & 1 ) )
+ {
+ update_decrypt_key_256( o_key, &rc );
+ add_round_key( s1, o_key + 16 );
+ }
+ else
+ add_round_key( s1, o_key );
+ inv_mix_sub_columns( s1 );
+ }
+#else
+ { uint8_t s2[N_BLOCK];
+ if( ( r & 1 ) )
+ {
+ update_decrypt_key_256( o_key, &rc );
+ copy_and_key( s2, s1, o_key + 16 );
+ }
+ else
+ copy_and_key( s2, s1, o_key );
+ inv_mix_sub_columns( s1, s2 );
+ }
+#endif
+ copy_and_key( out, s1, o_key );
+}
+
+#endif