8302d1708a
Until now, we only support aes128. This commit add the support of aes192 and aes256. Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com> Reviewed-by: Simon Glass <sjg@chromium.org>
111 lines
3.2 KiB
C
111 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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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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#ifndef _AES_REF_H_
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#define _AES_REF_H_
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#ifdef USE_HOSTCC
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/* Define compat stuff for use in fw_* tools. */
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typedef unsigned char u8;
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typedef unsigned int u32;
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#define debug(...) do {} while (0)
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#endif
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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_BLOCK_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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AES128_KEYCOLS = 4, /* columns in a key for aes128 */
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AES192_KEYCOLS = 6, /* columns in a key for aes128 */
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AES256_KEYCOLS = 8, /* columns in a key for aes128 */
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AES128_ROUNDS = 10, /* rounds in encryption for aes128 */
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AES192_ROUNDS = 12, /* rounds in encryption for aes192 */
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AES256_ROUNDS = 14, /* rounds in encryption for aes256 */
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AES128_KEY_LENGTH = 128 / 8,
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AES192_KEY_LENGTH = 192 / 8,
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AES256_KEY_LENGTH = 256 / 8,
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AES128_EXPAND_KEY_LENGTH = 4 * AES_STATECOLS * (AES128_ROUNDS + 1),
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AES192_EXPAND_KEY_LENGTH = 4 * AES_STATECOLS * (AES192_ROUNDS + 1),
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AES256_EXPAND_KEY_LENGTH = 4 * AES_STATECOLS * (AES256_ROUNDS + 1),
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AES_BLOCK_LENGTH = 128 / 8,
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};
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/**
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* aes_expand_key() - Expand the AES key
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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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* @key Key
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* @key_size Size of the key (in bits)
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* @expkey Buffer to place expanded key, AES_EXPAND_KEY_LENGTH
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*/
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void aes_expand_key(u8 *key, u32 key_size, u8 *expkey);
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/**
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* aes_encrypt() - Encrypt single block of data with AES 128
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*
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* @key_size Size of the aes key (in bits)
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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(u32 key_size, u8 *in, u8 *expkey, u8 *out);
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/**
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* aes_decrypt() - Decrypt single block of data with AES 128
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*
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* @key_size Size of the aes key (in bits)
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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(u32 key_size, u8 *in, u8 *expkey, u8 *out);
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/**
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* Apply chain data to the destination using EOR
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*
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* Each array is of length AES_BLOCK_LENGTH.
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*
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* @cbc_chain_data Chain data
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* @src Source data
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* @dst Destination data, which is modified here
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*/
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void aes_apply_cbc_chain_data(u8 *cbc_chain_data, u8 *src, u8 *dst);
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/**
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* aes_cbc_encrypt_blocks() - Encrypt multiple blocks of data with AES CBC.
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*
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* @key_size Size of the aes key (in bits)
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* @key_exp Expanded key to use
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* @iv Initialization vector
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* @src Source data to encrypt
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* @dst Destination buffer
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* @num_aes_blocks Number of AES blocks to encrypt
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*/
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void aes_cbc_encrypt_blocks(u32 key_size, u8 *key_exp, u8 *iv, u8 *src, u8 *dst,
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u32 num_aes_blocks);
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/**
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* Decrypt multiple blocks of data with AES CBC.
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*
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* @key_size Size of the aes key (in bits)
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* @key_exp Expanded key to use
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* @iv Initialization vector
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* @src Source data to decrypt
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* @dst Destination buffer
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* @num_aes_blocks Number of AES blocks to decrypt
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*/
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void aes_cbc_decrypt_blocks(u32 key_size, u8 *key_exp, u8 *iv, u8 *src, u8 *dst,
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u32 num_aes_blocks);
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#endif /* _AES_REF_H_ */
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