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5b1a5451d5
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>
71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
/*
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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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