From: Yen Lin yelin@nvidia.com

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 --- Changes in v2: - Tidy whitespace problems - Use const for sbox arrays

Changes in v4: - Correct 'form' typo

include/aes.h | 70 +++++++ lib/Makefile | 1 + lib/aes.c | 598 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 669 insertions(+), 0 deletions(-) create mode 100644 include/aes.h create mode 100644 lib/aes.c

diff --git a/include/aes.h b/include/aes.h new file mode 100644 index 0000000..41b0db2 --- /dev/null +++ b/include/aes.h @@ -0,0 +1,70 @@ +/* + * Copyright (c) 2011 The Chromium OS Authors. + * (C) Copyright 2010 - 2011 NVIDIA Corporation <www.nvidia.com> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#ifndef _AES_REF_H_ +#define _AES_REF_H_ + +/* + * AES encryption library, with small code size, supporting only 128-bit AES + * + * AES is a stream cipher which works a block at a time, with each block + * in this case being AES_KEY_LENGTH bytes. + */ + +enum { + AES_STATECOLS = 4, /* columns in the state & expanded key */ + AES_KEYCOLS = 4, /* columns in a key */ + AES_ROUNDS = 10, /* rounds in encryption */ + + AES_KEY_LENGTH = 128 / 8, + AES_EXPAND_KEY_LENGTH = 4 * AES_STATECOLS * (AES_ROUNDS + 1), +}; + +/** + * Expand a key into a key schedule, which is then used for the other + * operations. + * + * \param key Key, of length AES_KEY_LENGTH bytes + * \param expkey Buffer to place expanded key, AES_EXPAND_KEY_LENGTH + */ +void aes_expand_key(u8 *key, u8 *expkey); + +/** + * Encrypt a single block of data + * + * in Input data + * expkey Expanded key to use for encryption (from aes_expand_key()) + * out Output data + */ +void aes_encrypt(u8 *in, u8 *expkey, u8 *out); + +/** + * Decrypt a single block of data + * + * in Input data + * expkey Expanded key to use for decryption (from aes_expand_key()) + * out Output data + */ +void aes_decrypt(u8 *in, u8 *expkey, u8 *out); + +#endif /* _AES_REF_H_ */ diff --git a/lib/Makefile b/lib/Makefile index a0fec60..1e8478f 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -28,6 +28,7 @@ LIB = $(obj)libgeneric.o ifndef CONFIG_SPL_BUILD COBJS-$(CONFIG_ADDR_MAP) += addr_map.o COBJS-$(CONFIG_BCH) += bch.o +COBJS-$(CONFIG_AES) += aes.o COBJS-$(CONFIG_BZIP2) += bzlib.o COBJS-$(CONFIG_BZIP2) += bzlib_crctable.o COBJS-$(CONFIG_BZIP2) += bzlib_decompress.o diff --git a/lib/aes.c b/lib/aes.c new file mode 100644 index 0000000..7da9edb --- /dev/null +++ b/lib/aes.c @@ -0,0 +1,598 @@ +/* + * Copyright (c) 2011 The Chromium OS Authors. + * (C) Copyright 2011 NVIDIA Corporation www.nvidia.com + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +/* + * 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. +*/ + +#include <common.h> +#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)); +}