Add support for AES using an implementation from Karl Malbrain. This offers small code size (around 5KB on ARM) and supports 128-bit AES only. Signed-off-by: Yen Lin <yelin@nvidia.com> Signed-off-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Warren <twarren@nvidia.com>master
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/*
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* Copyright (c) 2011 The Chromium OS Authors. |
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* (C) Copyright 2010 - 2011 NVIDIA Corporation <www.nvidia.com> |
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* |
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* See file CREDITS for list of people who contributed to this |
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* project. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation; either version 2 of |
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* the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
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* MA 02111-1307 USA |
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*/ |
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#ifndef _AES_REF_H_ |
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#define _AES_REF_H_ |
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/*
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* AES encryption library, with small code size, supporting only 128-bit AES |
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* |
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* AES is a stream cipher which works a block at a time, with each block |
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* in this case being AES_KEY_LENGTH bytes. |
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*/ |
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enum { |
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AES_STATECOLS = 4, /* columns in the state & expanded key */ |
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AES_KEYCOLS = 4, /* columns in a key */ |
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AES_ROUNDS = 10, /* rounds in encryption */ |
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AES_KEY_LENGTH = 128 / 8, |
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AES_EXPAND_KEY_LENGTH = 4 * AES_STATECOLS * (AES_ROUNDS + 1), |
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}; |
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/**
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* Expand a key into a key schedule, which is then used for the other |
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* operations. |
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* |
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* \param key Key, of length AES_KEY_LENGTH bytes |
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* \param expkey Buffer to place expanded key, AES_EXPAND_KEY_LENGTH |
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*/ |
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void aes_expand_key(u8 *key, u8 *expkey); |
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/**
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* Encrypt a single block of data |
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* |
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* in Input data |
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* expkey Expanded key to use for encryption (from aes_expand_key()) |
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* out Output data |
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*/ |
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void aes_encrypt(u8 *in, u8 *expkey, u8 *out); |
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/**
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* Decrypt a single block of data |
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* |
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* in Input data |
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* expkey Expanded key to use for decryption (from aes_expand_key()) |
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* out Output data |
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*/ |
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void aes_decrypt(u8 *in, u8 *expkey, u8 *out); |
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#endif /* _AES_REF_H_ */ |
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/*
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* Copyright (c) 2011 The Chromium OS Authors. |
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* (C) Copyright 2011 NVIDIA Corporation www.nvidia.com |
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* |
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* See file CREDITS for list of people who contributed to this |
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* project. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation; either version 2 of |
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* the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
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* MA 02111-1307 USA |
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*/ |
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/*
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* advanced encryption standard |
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* author: karl malbrain, malbrain@yahoo.com |
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* |
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* This work, including the source code, documentation |
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* and related data, is placed into the public domain. |
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* |
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* The orginal author is Karl Malbrain. |
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* |
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* THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY |
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* OF ANY KIND, NOT EVEN THE IMPLIED WARRANTY OF |
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* MERCHANTABILITY. THE AUTHOR OF THIS SOFTWARE, |
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* ASSUMES _NO_ RESPONSIBILITY FOR ANY CONSEQUENCE |
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* RESULTING FROM THE USE, MODIFICATION, OR |
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* REDISTRIBUTION OF THIS SOFTWARE. |
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*/ |
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#include <common.h> |
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#include "aes.h" |
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/* forward s-box */ |
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static const u8 sbox[256] = { |
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0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, |
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0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, |
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0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, |
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0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, |
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0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, |
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0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, |
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0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, |
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0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, |
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0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, |
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0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, |
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0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, |
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0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, |
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0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, |
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0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, |
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0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, |
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0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, |
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0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, |
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0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, |
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0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, |
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0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, |
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0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, |
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0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, |
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0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, |
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0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, |
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0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, |
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0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, |
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0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, |
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0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, |
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0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, |
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0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, |
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0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, |
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0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 |
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}; |
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/* inverse s-box */ |
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static const u8 inv_sbox[256] = { |
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0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, |
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0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb, |
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0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, |
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0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb, |
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0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, |
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0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e, |
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0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, |
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0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25, |
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0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, |
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0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92, |
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0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, |
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0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84, |
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0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, |
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0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06, |
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0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, |
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0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b, |
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0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, |
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0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73, |
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0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, |
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0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e, |
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0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, |
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0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b, |
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0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, |
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0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4, |
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0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, |
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0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f, |
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0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, |
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0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef, |
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0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, |
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0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61, |
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0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, |
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0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d |
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}; |
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/* combined Xtimes2[Sbox[]] */ |
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static const u8 x2_sbox[256] = { |
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0xc6, 0xf8, 0xee, 0xf6, 0xff, 0xd6, 0xde, 0x91, |
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0x60, 0x02, 0xce, 0x56, 0xe7, 0xb5, 0x4d, 0xec, |
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0x8f, 0x1f, 0x89, 0xfa, 0xef, 0xb2, 0x8e, 0xfb, |
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0x41, 0xb3, 0x5f, 0x45, 0x23, 0x53, 0xe4, 0x9b, |
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0x75, 0xe1, 0x3d, 0x4c, 0x6c, 0x7e, 0xf5, 0x83, |
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0x68, 0x51, 0xd1, 0xf9, 0xe2, 0xab, 0x62, 0x2a, |
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0x08, 0x95, 0x46, 0x9d, 0x30, 0x37, 0x0a, 0x2f, |
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0x0e, 0x24, 0x1b, 0xdf, 0xcd, 0x4e, 0x7f, 0xea, |
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0x12, 0x1d, 0x58, 0x34, 0x36, 0xdc, 0xb4, 0x5b, |
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0xa4, 0x76, 0xb7, 0x7d, 0x52, 0xdd, 0x5e, 0x13, |
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0xa6, 0xb9, 0x00, 0xc1, 0x40, 0xe3, 0x79, 0xb6, |
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0xd4, 0x8d, 0x67, 0x72, 0x94, 0x98, 0xb0, 0x85, |
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0xbb, 0xc5, 0x4f, 0xed, 0x86, 0x9a, 0x66, 0x11, |
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0x8a, 0xe9, 0x04, 0xfe, 0xa0, 0x78, 0x25, 0x4b, |
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0xa2, 0x5d, 0x80, 0x05, 0x3f, 0x21, 0x70, 0xf1, |
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0x63, 0x77, 0xaf, 0x42, 0x20, 0xe5, 0xfd, 0xbf, |
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0x81, 0x18, 0x26, 0xc3, 0xbe, 0x35, 0x88, 0x2e, |
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0x93, 0x55, 0xfc, 0x7a, 0xc8, 0xba, 0x32, 0xe6, |
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0xc0, 0x19, 0x9e, 0xa3, 0x44, 0x54, 0x3b, 0x0b, |
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0x8c, 0xc7, 0x6b, 0x28, 0xa7, 0xbc, 0x16, 0xad, |
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0xdb, 0x64, 0x74, 0x14, 0x92, 0x0c, 0x48, 0xb8, |
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0x9f, 0xbd, 0x43, 0xc4, 0x39, 0x31, 0xd3, 0xf2, |
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0xd5, 0x8b, 0x6e, 0xda, 0x01, 0xb1, 0x9c, 0x49, |
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0xd8, 0xac, 0xf3, 0xcf, 0xca, 0xf4, 0x47, 0x10, |
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0x6f, 0xf0, 0x4a, 0x5c, 0x38, 0x57, 0x73, 0x97, |
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0xcb, 0xa1, 0xe8, 0x3e, 0x96, 0x61, 0x0d, 0x0f, |
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0xe0, 0x7c, 0x71, 0xcc, 0x90, 0x06, 0xf7, 0x1c, |
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0xc2, 0x6a, 0xae, 0x69, 0x17, 0x99, 0x3a, 0x27, |
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0xd9, 0xeb, 0x2b, 0x22, 0xd2, 0xa9, 0x07, 0x33, |
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0x2d, 0x3c, 0x15, 0xc9, 0x87, 0xaa, 0x50, 0xa5, |
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0x03, 0x59, 0x09, 0x1a, 0x65, 0xd7, 0x84, 0xd0, |
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0x82, 0x29, 0x5a, 0x1e, 0x7b, 0xa8, 0x6d, 0x2c |
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}; |
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/* combined Xtimes3[Sbox[]] */ |
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static const u8 x3_sbox[256] = { |
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0xa5, 0x84, 0x99, 0x8d, 0x0d, 0xbd, 0xb1, 0x54, |
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0x50, 0x03, 0xa9, 0x7d, 0x19, 0x62, 0xe6, 0x9a, |
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0x45, 0x9d, 0x40, 0x87, 0x15, 0xeb, 0xc9, 0x0b, |
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0xec, 0x67, 0xfd, 0xea, 0xbf, 0xf7, 0x96, 0x5b, |
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0xc2, 0x1c, 0xae, 0x6a, 0x5a, 0x41, 0x02, 0x4f, |
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0x5c, 0xf4, 0x34, 0x08, 0x93, 0x73, 0x53, 0x3f, |
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0x0c, 0x52, 0x65, 0x5e, 0x28, 0xa1, 0x0f, 0xb5, |
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0x09, 0x36, 0x9b, 0x3d, 0x26, 0x69, 0xcd, 0x9f, |
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0x1b, 0x9e, 0x74, 0x2e, 0x2d, 0xb2, 0xee, 0xfb, |
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0xf6, 0x4d, 0x61, 0xce, 0x7b, 0x3e, 0x71, 0x97, |
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0xf5, 0x68, 0x00, 0x2c, 0x60, 0x1f, 0xc8, 0xed, |
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0xbe, 0x46, 0xd9, 0x4b, 0xde, 0xd4, 0xe8, 0x4a, |
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0x6b, 0x2a, 0xe5, 0x16, 0xc5, 0xd7, 0x55, 0x94, |
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0xcf, 0x10, 0x06, 0x81, 0xf0, 0x44, 0xba, 0xe3, |
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0xf3, 0xfe, 0xc0, 0x8a, 0xad, 0xbc, 0x48, 0x04, |
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0xdf, 0xc1, 0x75, 0x63, 0x30, 0x1a, 0x0e, 0x6d, |
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0x4c, 0x14, 0x35, 0x2f, 0xe1, 0xa2, 0xcc, 0x39, |
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0x57, 0xf2, 0x82, 0x47, 0xac, 0xe7, 0x2b, 0x95, |
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0xa0, 0x98, 0xd1, 0x7f, 0x66, 0x7e, 0xab, 0x83, |
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0xca, 0x29, 0xd3, 0x3c, 0x79, 0xe2, 0x1d, 0x76, |
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0x3b, 0x56, 0x4e, 0x1e, 0xdb, 0x0a, 0x6c, 0xe4, |
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0x5d, 0x6e, 0xef, 0xa6, 0xa8, 0xa4, 0x37, 0x8b, |
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0x32, 0x43, 0x59, 0xb7, 0x8c, 0x64, 0xd2, 0xe0, |
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0xb4, 0xfa, 0x07, 0x25, 0xaf, 0x8e, 0xe9, 0x18, |
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0xd5, 0x88, 0x6f, 0x72, 0x24, 0xf1, 0xc7, 0x51, |
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0x23, 0x7c, 0x9c, 0x21, 0xdd, 0xdc, 0x86, 0x85, |
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0x90, 0x42, 0xc4, 0xaa, 0xd8, 0x05, 0x01, 0x12, |
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0xa3, 0x5f, 0xf9, 0xd0, 0x91, 0x58, 0x27, 0xb9, |
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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)); |
||||||
|
} |
Loading…
Reference in new issue