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u-boot/lib/aes.c
Marek Vasut a8a752c084 env: Implement support for AES encryption into fw_* tools 
Implement support for encrypting/decrypting the environment block
into the tools/env/fw_* tools. The cipher used is AES 128 CBC and
the implementation depends solely on components internal to U-Boot.

To allow building against the internal AES library, the library did
need minor adjustments to not include U-Boot's headers which are not
wanted to be included and define missing types.

Signed-off-by: Marek Vasut <marex@denx.de>
2014-03-21 16:44:08 -04:00

666 lines
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/*
* Copyright (c) 2011 The Chromium OS Authors.
* (C) Copyright 2011 NVIDIA Corporation www.nvidia.com
*
* SPDX-License-Identifier: GPL-2.0+
*/
/*
* advanced encryption standard
* author: karl malbrain, malbrain@yahoo.com
*
* This work, including the source code, documentation
* and related data, is placed into the public domain.
*
* The orginal author is Karl Malbrain.
*
* THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY
* OF ANY KIND, NOT EVEN THE IMPLIED WARRANTY OF
* MERCHANTABILITY. THE AUTHOR OF THIS SOFTWARE,
* ASSUMES _NO_ RESPONSIBILITY FOR ANY CONSEQUENCE
* RESULTING FROM THE USE, MODIFICATION, OR
* REDISTRIBUTION OF THIS SOFTWARE.
*/
#ifndef USE_HOSTCC
#include <common.h>
#else
#include <string.h>
#endif
#include "aes.h"
/* forward s-box */
static const u8 sbox[256] = {
0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5,
0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0,
0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc,
0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a,
0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0,
0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b,
0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85,
0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5,
0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17,
0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88,
0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c,
0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9,
0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6,
0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e,
0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94,
0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68,
0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
};
/* inverse s-box */
static const u8 inv_sbox[256] = {
0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38,
0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87,
0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d,
0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2,
0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16,
0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda,
0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a,
0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02,
0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea,
0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85,
0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89,
0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20,
0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31,
0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d,
0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0,
0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26,
0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d
};
/* combined Xtimes2[Sbox[]] */
static const u8 x2_sbox[256] = {
0xc6, 0xf8, 0xee, 0xf6, 0xff, 0xd6, 0xde, 0x91,
0x60, 0x02, 0xce, 0x56, 0xe7, 0xb5, 0x4d, 0xec,
0x8f, 0x1f, 0x89, 0xfa, 0xef, 0xb2, 0x8e, 0xfb,
0x41, 0xb3, 0x5f, 0x45, 0x23, 0x53, 0xe4, 0x9b,
0x75, 0xe1, 0x3d, 0x4c, 0x6c, 0x7e, 0xf5, 0x83,
0x68, 0x51, 0xd1, 0xf9, 0xe2, 0xab, 0x62, 0x2a,
0x08, 0x95, 0x46, 0x9d, 0x30, 0x37, 0x0a, 0x2f,
0x0e, 0x24, 0x1b, 0xdf, 0xcd, 0x4e, 0x7f, 0xea,
0x12, 0x1d, 0x58, 0x34, 0x36, 0xdc, 0xb4, 0x5b,
0xa4, 0x76, 0xb7, 0x7d, 0x52, 0xdd, 0x5e, 0x13,
0xa6, 0xb9, 0x00, 0xc1, 0x40, 0xe3, 0x79, 0xb6,
0xd4, 0x8d, 0x67, 0x72, 0x94, 0x98, 0xb0, 0x85,
0xbb, 0xc5, 0x4f, 0xed, 0x86, 0x9a, 0x66, 0x11,
0x8a, 0xe9, 0x04, 0xfe, 0xa0, 0x78, 0x25, 0x4b,
0xa2, 0x5d, 0x80, 0x05, 0x3f, 0x21, 0x70, 0xf1,
0x63, 0x77, 0xaf, 0x42, 0x20, 0xe5, 0xfd, 0xbf,
0x81, 0x18, 0x26, 0xc3, 0xbe, 0x35, 0x88, 0x2e,
0x93, 0x55, 0xfc, 0x7a, 0xc8, 0xba, 0x32, 0xe6,
0xc0, 0x19, 0x9e, 0xa3, 0x44, 0x54, 0x3b, 0x0b,
0x8c, 0xc7, 0x6b, 0x28, 0xa7, 0xbc, 0x16, 0xad,
0xdb, 0x64, 0x74, 0x14, 0x92, 0x0c, 0x48, 0xb8,
0x9f, 0xbd, 0x43, 0xc4, 0x39, 0x31, 0xd3, 0xf2,
0xd5, 0x8b, 0x6e, 0xda, 0x01, 0xb1, 0x9c, 0x49,
0xd8, 0xac, 0xf3, 0xcf, 0xca, 0xf4, 0x47, 0x10,
0x6f, 0xf0, 0x4a, 0x5c, 0x38, 0x57, 0x73, 0x97,
0xcb, 0xa1, 0xe8, 0x3e, 0x96, 0x61, 0x0d, 0x0f,
0xe0, 0x7c, 0x71, 0xcc, 0x90, 0x06, 0xf7, 0x1c,
0xc2, 0x6a, 0xae, 0x69, 0x17, 0x99, 0x3a, 0x27,
0xd9, 0xeb, 0x2b, 0x22, 0xd2, 0xa9, 0x07, 0x33,
0x2d, 0x3c, 0x15, 0xc9, 0x87, 0xaa, 0x50, 0xa5,
0x03, 0x59, 0x09, 0x1a, 0x65, 0xd7, 0x84, 0xd0,
0x82, 0x29, 0x5a, 0x1e, 0x7b, 0xa8, 0x6d, 0x2c
};
/* combined Xtimes3[Sbox[]] */
static const u8 x3_sbox[256] = {
0xa5, 0x84, 0x99, 0x8d, 0x0d, 0xbd, 0xb1, 0x54,
0x50, 0x03, 0xa9, 0x7d, 0x19, 0x62, 0xe6, 0x9a,
0x45, 0x9d, 0x40, 0x87, 0x15, 0xeb, 0xc9, 0x0b,
0xec, 0x67, 0xfd, 0xea, 0xbf, 0xf7, 0x96, 0x5b,
0xc2, 0x1c, 0xae, 0x6a, 0x5a, 0x41, 0x02, 0x4f,
0x5c, 0xf4, 0x34, 0x08, 0x93, 0x73, 0x53, 0x3f,
0x0c, 0x52, 0x65, 0x5e, 0x28, 0xa1, 0x0f, 0xb5,
0x09, 0x36, 0x9b, 0x3d, 0x26, 0x69, 0xcd, 0x9f,
0x1b, 0x9e, 0x74, 0x2e, 0x2d, 0xb2, 0xee, 0xfb,
0xf6, 0x4d, 0x61, 0xce, 0x7b, 0x3e, 0x71, 0x97,
0xf5, 0x68, 0x00, 0x2c, 0x60, 0x1f, 0xc8, 0xed,
0xbe, 0x46, 0xd9, 0x4b, 0xde, 0xd4, 0xe8, 0x4a,
0x6b, 0x2a, 0xe5, 0x16, 0xc5, 0xd7, 0x55, 0x94,
0xcf, 0x10, 0x06, 0x81, 0xf0, 0x44, 0xba, 0xe3,
0xf3, 0xfe, 0xc0, 0x8a, 0xad, 0xbc, 0x48, 0x04,
0xdf, 0xc1, 0x75, 0x63, 0x30, 0x1a, 0x0e, 0x6d,
0x4c, 0x14, 0x35, 0x2f, 0xe1, 0xa2, 0xcc, 0x39,
0x57, 0xf2, 0x82, 0x47, 0xac, 0xe7, 0x2b, 0x95,
0xa0, 0x98, 0xd1, 0x7f, 0x66, 0x7e, 0xab, 0x83,
0xca, 0x29, 0xd3, 0x3c, 0x79, 0xe2, 0x1d, 0x76,
0x3b, 0x56, 0x4e, 0x1e, 0xdb, 0x0a, 0x6c, 0xe4,
0x5d, 0x6e, 0xef, 0xa6, 0xa8, 0xa4, 0x37, 0x8b,
0x32, 0x43, 0x59, 0xb7, 0x8c, 0x64, 0xd2, 0xe0,
0xb4, 0xfa, 0x07, 0x25, 0xaf, 0x8e, 0xe9, 0x18,
0xd5, 0x88, 0x6f, 0x72, 0x24, 0xf1, 0xc7, 0x51,
0x23, 0x7c, 0x9c, 0x21, 0xdd, 0xdc, 0x86, 0x85,
0x90, 0x42, 0xc4, 0xaa, 0xd8, 0x05, 0x01, 0x12,
0xa3, 0x5f, 0xf9, 0xd0, 0x91, 0x58, 0x27, 0xb9,
0x38, 0x13, 0xb3, 0x33, 0xbb, 0x70, 0x89, 0xa7,
0xb6, 0x22, 0x92, 0x20, 0x49, 0xff, 0x78, 0x7a,
0x8f, 0xf8, 0x80, 0x17, 0xda, 0x31, 0xc6, 0xb8,
0xc3, 0xb0, 0x77, 0x11, 0xcb, 0xfc, 0xd6, 0x3a
};
/*
* modular multiplication tables based on:
*
* Xtime2[x] = (x & 0x80 ? 0x1b : 0) ^ (x + x)
* Xtime3[x] = x^Xtime2[x];
*/
static const u8 x_time_9[256] = {
0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f,
0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77,
0x90, 0x99, 0x82, 0x8b, 0xb4, 0xbd, 0xa6, 0xaf,
0xd8, 0xd1, 0xca, 0xc3, 0xfc, 0xf5, 0xee, 0xe7,
0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04,
0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c,
0xab, 0xa2, 0xb9, 0xb0, 0x8f, 0x86, 0x9d, 0x94,
0xe3, 0xea, 0xf1, 0xf8, 0xc7, 0xce, 0xd5, 0xdc,
0x76, 0x7f, 0x64, 0x6d, 0x52, 0x5b, 0x40, 0x49,
0x3e, 0x37, 0x2c, 0x25, 0x1a, 0x13, 0x08, 0x01,
0xe6, 0xef, 0xf4, 0xfd, 0xc2, 0xcb, 0xd0, 0xd9,
0xae, 0xa7, 0xbc, 0xb5, 0x8a, 0x83, 0x98, 0x91,
0x4d, 0x44, 0x5f, 0x56, 0x69, 0x60, 0x7b, 0x72,
0x05, 0x0c, 0x17, 0x1e, 0x21, 0x28, 0x33, 0x3a,
0xdd, 0xd4, 0xcf, 0xc6, 0xf9, 0xf0, 0xeb, 0xe2,
0x95, 0x9c, 0x87, 0x8e, 0xb1, 0xb8, 0xa3, 0xaa,
0xec, 0xe5, 0xfe, 0xf7, 0xc8, 0xc1, 0xda, 0xd3,
0xa4, 0xad, 0xb6, 0xbf, 0x80, 0x89, 0x92, 0x9b,
0x7c, 0x75, 0x6e, 0x67, 0x58, 0x51, 0x4a, 0x43,
0x34, 0x3d, 0x26, 0x2f, 0x10, 0x19, 0x02, 0x0b,
0xd7, 0xde, 0xc5, 0xcc, 0xf3, 0xfa, 0xe1, 0xe8,
0x9f, 0x96, 0x8d, 0x84, 0xbb, 0xb2, 0xa9, 0xa0,
0x47, 0x4e, 0x55, 0x5c, 0x63, 0x6a, 0x71, 0x78,
0x0f, 0x06, 0x1d, 0x14, 0x2b, 0x22, 0x39, 0x30,
0x9a, 0x93, 0x88, 0x81, 0xbe, 0xb7, 0xac, 0xa5,
0xd2, 0xdb, 0xc0, 0xc9, 0xf6, 0xff, 0xe4, 0xed,
0x0a, 0x03, 0x18, 0x11, 0x2e, 0x27, 0x3c, 0x35,
0x42, 0x4b, 0x50, 0x59, 0x66, 0x6f, 0x74, 0x7d,
0xa1, 0xa8, 0xb3, 0xba, 0x85, 0x8c, 0x97, 0x9e,
0xe9, 0xe0, 0xfb, 0xf2, 0xcd, 0xc4, 0xdf, 0xd6,
0x31, 0x38, 0x23, 0x2a, 0x15, 0x1c, 0x07, 0x0e,
0x79, 0x70, 0x6b, 0x62, 0x5d, 0x54, 0x4f, 0x46
};
static const u8 x_time_b[256] = {
0x00, 0x0b, 0x16, 0x1d, 0x2c, 0x27, 0x3a, 0x31,
0x58, 0x53, 0x4e, 0x45, 0x74, 0x7f, 0x62, 0x69,
0xb0, 0xbb, 0xa6, 0xad, 0x9c, 0x97, 0x8a, 0x81,
0xe8, 0xe3, 0xfe, 0xf5, 0xc4, 0xcf, 0xd2, 0xd9,
0x7b, 0x70, 0x6d, 0x66, 0x57, 0x5c, 0x41, 0x4a,
0x23, 0x28, 0x35, 0x3e, 0x0f, 0x04, 0x19, 0x12,
0xcb, 0xc0, 0xdd, 0xd6, 0xe7, 0xec, 0xf1, 0xfa,
0x93, 0x98, 0x85, 0x8e, 0xbf, 0xb4, 0xa9, 0xa2,
0xf6, 0xfd, 0xe0, 0xeb, 0xda, 0xd1, 0xcc, 0xc7,
0xae, 0xa5, 0xb8, 0xb3, 0x82, 0x89, 0x94, 0x9f,
0x46, 0x4d, 0x50, 0x5b, 0x6a, 0x61, 0x7c, 0x77,
0x1e, 0x15, 0x08, 0x03, 0x32, 0x39, 0x24, 0x2f,
0x8d, 0x86, 0x9b, 0x90, 0xa1, 0xaa, 0xb7, 0xbc,
0xd5, 0xde, 0xc3, 0xc8, 0xf9, 0xf2, 0xef, 0xe4,
0x3d, 0x36, 0x2b, 0x20, 0x11, 0x1a, 0x07, 0x0c,
0x65, 0x6e, 0x73, 0x78, 0x49, 0x42, 0x5f, 0x54,
0xf7, 0xfc, 0xe1, 0xea, 0xdb, 0xd0, 0xcd, 0xc6,
0xaf, 0xa4, 0xb9, 0xb2, 0x83, 0x88, 0x95, 0x9e,
0x47, 0x4c, 0x51, 0x5a, 0x6b, 0x60, 0x7d, 0x76,
0x1f, 0x14, 0x09, 0x02, 0x33, 0x38, 0x25, 0x2e,
0x8c, 0x87, 0x9a, 0x91, 0xa0, 0xab, 0xb6, 0xbd,
0xd4, 0xdf, 0xc2, 0xc9, 0xf8, 0xf3, 0xee, 0xe5,
0x3c, 0x37, 0x2a, 0x21, 0x10, 0x1b, 0x06, 0x0d,
0x64, 0x6f, 0x72, 0x79, 0x48, 0x43, 0x5e, 0x55,
0x01, 0x0a, 0x17, 0x1c, 0x2d, 0x26, 0x3b, 0x30,
0x59, 0x52, 0x4f, 0x44, 0x75, 0x7e, 0x63, 0x68,
0xb1, 0xba, 0xa7, 0xac, 0x9d, 0x96, 0x8b, 0x80,
0xe9, 0xe2, 0xff, 0xf4, 0xc5, 0xce, 0xd3, 0xd8,
0x7a, 0x71, 0x6c, 0x67, 0x56, 0x5d, 0x40, 0x4b,
0x22, 0x29, 0x34, 0x3f, 0x0e, 0x05, 0x18, 0x13,
0xca, 0xc1, 0xdc, 0xd7, 0xe6, 0xed, 0xf0, 0xfb,
0x92, 0x99, 0x84, 0x8f, 0xbe, 0xb5, 0xa8, 0xa3
};
static const u8 x_time_d[256] = {
0x00, 0x0d, 0x1a, 0x17, 0x34, 0x39, 0x2e, 0x23,
0x68, 0x65, 0x72, 0x7f, 0x5c, 0x51, 0x46, 0x4b,
0xd0, 0xdd, 0xca, 0xc7, 0xe4, 0xe9, 0xfe, 0xf3,
0xb8, 0xb5, 0xa2, 0xaf, 0x8c, 0x81, 0x96, 0x9b,
0xbb, 0xb6, 0xa1, 0xac, 0x8f, 0x82, 0x95, 0x98,
0xd3, 0xde, 0xc9, 0xc4, 0xe7, 0xea, 0xfd, 0xf0,
0x6b, 0x66, 0x71, 0x7c, 0x5f, 0x52, 0x45, 0x48,
0x03, 0x0e, 0x19, 0x14, 0x37, 0x3a, 0x2d, 0x20,
0x6d, 0x60, 0x77, 0x7a, 0x59, 0x54, 0x43, 0x4e,
0x05, 0x08, 0x1f, 0x12, 0x31, 0x3c, 0x2b, 0x26,
0xbd, 0xb0, 0xa7, 0xaa, 0x89, 0x84, 0x93, 0x9e,
0xd5, 0xd8, 0xcf, 0xc2, 0xe1, 0xec, 0xfb, 0xf6,
0xd6, 0xdb, 0xcc, 0xc1, 0xe2, 0xef, 0xf8, 0xf5,
0xbe, 0xb3, 0xa4, 0xa9, 0x8a, 0x87, 0x90, 0x9d,
0x06, 0x0b, 0x1c, 0x11, 0x32, 0x3f, 0x28, 0x25,
0x6e, 0x63, 0x74, 0x79, 0x5a, 0x57, 0x40, 0x4d,
0xda, 0xd7, 0xc0, 0xcd, 0xee, 0xe3, 0xf4, 0xf9,
0xb2, 0xbf, 0xa8, 0xa5, 0x86, 0x8b, 0x9c, 0x91,
0x0a, 0x07, 0x10, 0x1d, 0x3e, 0x33, 0x24, 0x29,
0x62, 0x6f, 0x78, 0x75, 0x56, 0x5b, 0x4c, 0x41,
0x61, 0x6c, 0x7b, 0x76, 0x55, 0x58, 0x4f, 0x42,
0x09, 0x04, 0x13, 0x1e, 0x3d, 0x30, 0x27, 0x2a,
0xb1, 0xbc, 0xab, 0xa6, 0x85, 0x88, 0x9f, 0x92,
0xd9, 0xd4, 0xc3, 0xce, 0xed, 0xe0, 0xf7, 0xfa,
0xb7, 0xba, 0xad, 0xa0, 0x83, 0x8e, 0x99, 0x94,
0xdf, 0xd2, 0xc5, 0xc8, 0xeb, 0xe6, 0xf1, 0xfc,
0x67, 0x6a, 0x7d, 0x70, 0x53, 0x5e, 0x49, 0x44,
0x0f, 0x02, 0x15, 0x18, 0x3b, 0x36, 0x21, 0x2c,
0x0c, 0x01, 0x16, 0x1b, 0x38, 0x35, 0x22, 0x2f,
0x64, 0x69, 0x7e, 0x73, 0x50, 0x5d, 0x4a, 0x47,
0xdc, 0xd1, 0xc6, 0xcb, 0xe8, 0xe5, 0xf2, 0xff,
0xb4, 0xb9, 0xae, 0xa3, 0x80, 0x8d, 0x9a, 0x97
};
static const u8 x_time_e[256] = {
0x00, 0x0e, 0x1c, 0x12, 0x38, 0x36, 0x24, 0x2a,
0x70, 0x7e, 0x6c, 0x62, 0x48, 0x46, 0x54, 0x5a,
0xe0, 0xee, 0xfc, 0xf2, 0xd8, 0xd6, 0xc4, 0xca,
0x90, 0x9e, 0x8c, 0x82, 0xa8, 0xa6, 0xb4, 0xba,
0xdb, 0xd5, 0xc7, 0xc9, 0xe3, 0xed, 0xff, 0xf1,
0xab, 0xa5, 0xb7, 0xb9, 0x93, 0x9d, 0x8f, 0x81,
0x3b, 0x35, 0x27, 0x29, 0x03, 0x0d, 0x1f, 0x11,
0x4b, 0x45, 0x57, 0x59, 0x73, 0x7d, 0x6f, 0x61,
0xad, 0xa3, 0xb1, 0xbf, 0x95, 0x9b, 0x89, 0x87,
0xdd, 0xd3, 0xc1, 0xcf, 0xe5, 0xeb, 0xf9, 0xf7,
0x4d, 0x43, 0x51, 0x5f, 0x75, 0x7b, 0x69, 0x67,
0x3d, 0x33, 0x21, 0x2f, 0x05, 0x0b, 0x19, 0x17,
0x76, 0x78, 0x6a, 0x64, 0x4e, 0x40, 0x52, 0x5c,
0x06, 0x08, 0x1a, 0x14, 0x3e, 0x30, 0x22, 0x2c,
0x96, 0x98, 0x8a, 0x84, 0xae, 0xa0, 0xb2, 0xbc,
0xe6, 0xe8, 0xfa, 0xf4, 0xde, 0xd0, 0xc2, 0xcc,
0x41, 0x4f, 0x5d, 0x53, 0x79, 0x77, 0x65, 0x6b,
0x31, 0x3f, 0x2d, 0x23, 0x09, 0x07, 0x15, 0x1b,
0xa1, 0xaf, 0xbd, 0xb3, 0x99, 0x97, 0x85, 0x8b,
0xd1, 0xdf, 0xcd, 0xc3, 0xe9, 0xe7, 0xf5, 0xfb,
0x9a, 0x94, 0x86, 0x88, 0xa2, 0xac, 0xbe, 0xb0,
0xea, 0xe4, 0xf6, 0xf8, 0xd2, 0xdc, 0xce, 0xc0,
0x7a, 0x74, 0x66, 0x68, 0x42, 0x4c, 0x5e, 0x50,
0x0a, 0x04, 0x16, 0x18, 0x32, 0x3c, 0x2e, 0x20,
0xec, 0xe2, 0xf0, 0xfe, 0xd4, 0xda, 0xc8, 0xc6,
0x9c, 0x92, 0x80, 0x8e, 0xa4, 0xaa, 0xb8, 0xb6,
0x0c, 0x02, 0x10, 0x1e, 0x34, 0x3a, 0x28, 0x26,
0x7c, 0x72, 0x60, 0x6e, 0x44, 0x4a, 0x58, 0x56,
0x37, 0x39, 0x2b, 0x25, 0x0f, 0x01, 0x13, 0x1d,
0x47, 0x49, 0x5b, 0x55, 0x7f, 0x71, 0x63, 0x6d,
0xd7, 0xd9, 0xcb, 0xc5, 0xef, 0xe1, 0xf3, 0xfd,
0xa7, 0xa9, 0xbb, 0xb5, 0x9f, 0x91, 0x83, 0x8d
};
/*
* Exchanges columns in each of 4 rows
* row0 - unchanged, row1- shifted left 1,
* row2 - shifted left 2 and row3 - shifted left 3
*/
static void shift_rows(u8 *state)
{
u8 tmp;
/* just substitute row 0 */
state[0] = sbox[state[0]];
state[4] = sbox[state[4]];
state[8] = sbox[state[8]];
state[12] = sbox[state[12]];
/* rotate row 1 */
tmp = sbox[state[1]];
state[1] = sbox[state[5]];
state[5] = sbox[state[9]];
state[9] = sbox[state[13]];
state[13] = tmp;
/* rotate row 2 */
tmp = sbox[state[2]];
state[2] = sbox[state[10]];
state[10] = tmp;
tmp = sbox[state[6]];
state[6] = sbox[state[14]];
state[14] = tmp;
/* rotate row 3 */
tmp = sbox[state[15]];
state[15] = sbox[state[11]];
state[11] = sbox[state[7]];
state[7] = sbox[state[3]];
state[3] = tmp;
}
/*
* restores columns in each of 4 rows
* row0 - unchanged, row1- shifted right 1,
* row2 - shifted right 2 and row3 - shifted right 3
*/
static void inv_shift_rows(u8 *state)
{
u8 tmp;
/* restore row 0 */
state[0] = inv_sbox[state[0]];
state[4] = inv_sbox[state[4]];
state[8] = inv_sbox[state[8]];
state[12] = inv_sbox[state[12]];
/* restore row 1 */
tmp = inv_sbox[state[13]];
state[13] = inv_sbox[state[9]];
state[9] = inv_sbox[state[5]];
state[5] = inv_sbox[state[1]];
state[1] = tmp;
/* restore row 2 */
tmp = inv_sbox[state[2]];
state[2] = inv_sbox[state[10]];
state[10] = tmp;
tmp = inv_sbox[state[6]];
state[6] = inv_sbox[state[14]];
state[14] = tmp;
/* restore row 3 */
tmp = inv_sbox[state[3]];
state[3] = inv_sbox[state[7]];
state[7] = inv_sbox[state[11]];
state[11] = inv_sbox[state[15]];
state[15] = tmp;
}
/* recombine and mix each row in a column */
static void mix_sub_columns(u8 *state)
{
u8 tmp[4 * AES_STATECOLS];
/* mixing column 0 */
tmp[0] = x2_sbox[state[0]] ^ x3_sbox[state[5]] ^
sbox[state[10]] ^ sbox[state[15]];
tmp[1] = sbox[state[0]] ^ x2_sbox[state[5]] ^
x3_sbox[state[10]] ^ sbox[state[15]];
tmp[2] = sbox[state[0]] ^ sbox[state[5]] ^
x2_sbox[state[10]] ^ x3_sbox[state[15]];
tmp[3] = x3_sbox[state[0]] ^ sbox[state[5]] ^
sbox[state[10]] ^ x2_sbox[state[15]];
/* mixing column 1 */
tmp[4] = x2_sbox[state[4]] ^ x3_sbox[state[9]] ^
sbox[state[14]] ^ sbox[state[3]];
tmp[5] = sbox[state[4]] ^ x2_sbox[state[9]] ^
x3_sbox[state[14]] ^ sbox[state[3]];
tmp[6] = sbox[state[4]] ^ sbox[state[9]] ^
x2_sbox[state[14]] ^ x3_sbox[state[3]];
tmp[7] = x3_sbox[state[4]] ^ sbox[state[9]] ^
sbox[state[14]] ^ x2_sbox[state[3]];
/* mixing column 2 */
tmp[8] = x2_sbox[state[8]] ^ x3_sbox[state[13]] ^
sbox[state[2]] ^ sbox[state[7]];
tmp[9] = sbox[state[8]] ^ x2_sbox[state[13]] ^
x3_sbox[state[2]] ^ sbox[state[7]];
tmp[10] = sbox[state[8]] ^ sbox[state[13]] ^
x2_sbox[state[2]] ^ x3_sbox[state[7]];
tmp[11] = x3_sbox[state[8]] ^ sbox[state[13]] ^
sbox[state[2]] ^ x2_sbox[state[7]];
/* mixing column 3 */
tmp[12] = x2_sbox[state[12]] ^ x3_sbox[state[1]] ^
sbox[state[6]] ^ sbox[state[11]];
tmp[13] = sbox[state[12]] ^ x2_sbox[state[1]] ^
x3_sbox[state[6]] ^ sbox[state[11]];
tmp[14] = sbox[state[12]] ^ sbox[state[1]] ^
x2_sbox[state[6]] ^ x3_sbox[state[11]];
tmp[15] = x3_sbox[state[12]] ^ sbox[state[1]] ^
sbox[state[6]] ^ x2_sbox[state[11]];
memcpy(state, tmp, sizeof(tmp));
}
/* restore and un-mix each row in a column */
static void inv_mix_sub_columns(u8 *state)
{
u8 tmp[4 * AES_STATECOLS];
int i;
/* restore column 0 */
tmp[0] = x_time_e[state[0]] ^ x_time_b[state[1]] ^
x_time_d[state[2]] ^ x_time_9[state[3]];
tmp[5] = x_time_9[state[0]] ^ x_time_e[state[1]] ^
x_time_b[state[2]] ^ x_time_d[state[3]];
tmp[10] = x_time_d[state[0]] ^ x_time_9[state[1]] ^
x_time_e[state[2]] ^ x_time_b[state[3]];
tmp[15] = x_time_b[state[0]] ^ x_time_d[state[1]] ^
x_time_9[state[2]] ^ x_time_e[state[3]];
/* restore column 1 */
tmp[4] = x_time_e[state[4]] ^ x_time_b[state[5]] ^
x_time_d[state[6]] ^ x_time_9[state[7]];
tmp[9] = x_time_9[state[4]] ^ x_time_e[state[5]] ^
x_time_b[state[6]] ^ x_time_d[state[7]];
tmp[14] = x_time_d[state[4]] ^ x_time_9[state[5]] ^
x_time_e[state[6]] ^ x_time_b[state[7]];
tmp[3] = x_time_b[state[4]] ^ x_time_d[state[5]] ^
x_time_9[state[6]] ^ x_time_e[state[7]];
/* restore column 2 */
tmp[8] = x_time_e[state[8]] ^ x_time_b[state[9]] ^
x_time_d[state[10]] ^ x_time_9[state[11]];
tmp[13] = x_time_9[state[8]] ^ x_time_e[state[9]] ^
x_time_b[state[10]] ^ x_time_d[state[11]];
tmp[2] = x_time_d[state[8]] ^ x_time_9[state[9]] ^
x_time_e[state[10]] ^ x_time_b[state[11]];
tmp[7] = x_time_b[state[8]] ^ x_time_d[state[9]] ^
x_time_9[state[10]] ^ x_time_e[state[11]];
/* restore column 3 */
tmp[12] = x_time_e[state[12]] ^ x_time_b[state[13]] ^
x_time_d[state[14]] ^ x_time_9[state[15]];
tmp[1] = x_time_9[state[12]] ^ x_time_e[state[13]] ^
x_time_b[state[14]] ^ x_time_d[state[15]];
tmp[6] = x_time_d[state[12]] ^ x_time_9[state[13]] ^
x_time_e[state[14]] ^ x_time_b[state[15]];
tmp[11] = x_time_b[state[12]] ^ x_time_d[state[13]] ^
x_time_9[state[14]] ^ x_time_e[state[15]];
for (i = 0; i < 4 * AES_STATECOLS; i++)
state[i] = inv_sbox[tmp[i]];
}
/*
* encrypt/decrypt columns of the key
* n.b. you can replace this with byte-wise xor if you wish.
*/
static void add_round_key(u32 *state, u32 *key)
{
int idx;
for (idx = 0; idx < 4; idx++)
state[idx] ^= key[idx];
}
static u8 rcon[11] = {
0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36
};
/* produce AES_STATECOLS bytes for each round */
void aes_expand_key(u8 *key, u8 *expkey)
{
u8 tmp0, tmp1, tmp2, tmp3, tmp4;
u32 idx;
memcpy(expkey, key, AES_KEYCOLS * 4);
for (idx = AES_KEYCOLS; idx < AES_STATECOLS * (AES_ROUNDS + 1); idx++) {
tmp0 = expkey[4*idx - 4];
tmp1 = expkey[4*idx - 3];
tmp2 = expkey[4*idx - 2];
tmp3 = expkey[4*idx - 1];
if (!(idx % AES_KEYCOLS)) {
tmp4 = tmp3;
tmp3 = sbox[tmp0];
tmp0 = sbox[tmp1] ^ rcon[idx / AES_KEYCOLS];
tmp1 = sbox[tmp2];
tmp2 = sbox[tmp4];
} else if ((AES_KEYCOLS > 6) && (idx % AES_KEYCOLS == 4)) {
tmp0 = sbox[tmp0];
tmp1 = sbox[tmp1];
tmp2 = sbox[tmp2];
tmp3 = sbox[tmp3];
}
expkey[4*idx+0] = expkey[4*idx - 4*AES_KEYCOLS + 0] ^ tmp0;
expkey[4*idx+1] = expkey[4*idx - 4*AES_KEYCOLS + 1] ^ tmp1;
expkey[4*idx+2] = expkey[4*idx - 4*AES_KEYCOLS + 2] ^ tmp2;
expkey[4*idx+3] = expkey[4*idx - 4*AES_KEYCOLS + 3] ^ tmp3;
}
}
/* encrypt one 128 bit block */
void aes_encrypt(u8 *in, u8 *expkey, u8 *out)
{
u8 state[AES_STATECOLS * 4];
u32 round;
memcpy(state, in, AES_STATECOLS * 4);
add_round_key((u32 *)state, (u32 *)expkey);
for (round = 1; round < AES_ROUNDS + 1; round++) {
if (round < AES_ROUNDS)
mix_sub_columns(state);
else
shift_rows(state);
add_round_key((u32 *)state,
(u32 *)expkey + round * AES_STATECOLS);
}
memcpy(out, state, sizeof(state));
}
void aes_decrypt(u8 *in, u8 *expkey, u8 *out)
{
u8 state[AES_STATECOLS * 4];
int round;
memcpy(state, in, sizeof(state));
add_round_key((u32 *)state,
(u32 *)expkey + AES_ROUNDS * AES_STATECOLS);
inv_shift_rows(state);
for (round = AES_ROUNDS; round--; ) {
add_round_key((u32 *)state,
(u32 *)expkey + round * AES_STATECOLS);
if (round)
inv_mix_sub_columns(state);
}
memcpy(out, state, sizeof(state));
}
static void debug_print_vector(char *name, u32 num_bytes, u8 *data)
{
#ifdef DEBUG
printf("%s [%d] @0x%08x", name, num_bytes, (u32)data);
print_buffer(0, data, 1, num_bytes, 16);
#endif
}
/**
* Apply chain data to the destination using EOR
*
* Each array is of length AES_KEY_LENGTH.
*
* @cbc_chain_data Chain data
* @src Source data
* @dst Destination data, which is modified here
*/
static void apply_cbc_chain_data(u8 *cbc_chain_data, u8 *src, u8 *dst)
{
int i;
for (i = 0; i < AES_KEY_LENGTH; i++)
*dst++ = *src++ ^ *cbc_chain_data++;
}
void aes_cbc_encrypt_blocks(u8 *key_exp, u8 *src, u8 *dst, u32 num_aes_blocks)
{
u8 zero_key[AES_KEY_LENGTH] = { 0 };
u8 tmp_data[AES_KEY_LENGTH];
/* Convenient array of 0's for IV */
u8 *cbc_chain_data = zero_key;
u32 i;
for (i = 0; i < num_aes_blocks; i++) {
debug("encrypt_object: block %d of %d\n", i, num_aes_blocks);
debug_print_vector("AES Src", AES_KEY_LENGTH, src);
/* Apply the chain data */
apply_cbc_chain_data(cbc_chain_data, src, tmp_data);
debug_print_vector("AES Xor", AES_KEY_LENGTH, tmp_data);
/* Encrypt the AES block */
aes_encrypt(tmp_data, key_exp, dst);
debug_print_vector("AES Dst", AES_KEY_LENGTH, dst);
/* Update pointers for next loop. */
cbc_chain_data = dst;
src += AES_KEY_LENGTH;
dst += AES_KEY_LENGTH;
}
}
void aes_cbc_decrypt_blocks(u8 *key_exp, u8 *src, u8 *dst, u32 num_aes_blocks)
{
u8 tmp_data[AES_KEY_LENGTH], tmp_block[AES_KEY_LENGTH];
/* Convenient array of 0's for IV */
u8 cbc_chain_data[AES_KEY_LENGTH] = { 0 };
u32 i;
for (i = 0; i < num_aes_blocks; i++) {
debug("encrypt_object: block %d of %d\n", i, num_aes_blocks);
debug_print_vector("AES Src", AES_KEY_LENGTH, src);
memcpy(tmp_block, src, AES_KEY_LENGTH);
/* Decrypt the AES block */
aes_decrypt(src, key_exp, tmp_data);
debug_print_vector("AES Xor", AES_KEY_LENGTH, tmp_data);
/* Apply the chain data */
apply_cbc_chain_data(cbc_chain_data, tmp_data, dst);
debug_print_vector("AES Dst", AES_KEY_LENGTH, dst);
/* Update pointers for next loop. */
memcpy(cbc_chain_data, tmp_block, AES_KEY_LENGTH);
src += AES_KEY_LENGTH;
dst += AES_KEY_LENGTH;
}
}
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