aes.h
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/*
* Copyright (c) 2011 The Chromium OS Authors.
* (C) Copyright 2010 - 2011 NVIDIA Corporation <www.nvidia.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _AES_REF_H_
#define _AES_REF_H_
#ifdef USE_HOSTCC
/* Define compat stuff for use in fw_* tools. */
typedef unsigned char u8;
typedef unsigned int u32;
#define debug(...) do {} while (0)
#endif
/*
* 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),
};
/**
* aes_expand_key() - Expand the AES key
*
* Expand a key into a key schedule, which is then used for the other
* operations.
*
* @key Key, of length AES_KEY_LENGTH bytes
* @expkey Buffer to place expanded key, AES_EXPAND_KEY_LENGTH
*/
void aes_expand_key(u8 *key, u8 *expkey);
/**
* aes_encrypt() - Encrypt single block of data with AES 128
*
* @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);
/**
* aes_decrypt() - Decrypt single block of data with AES 128
*
* @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);
/**
* 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
*/
void aes_apply_cbc_chain_data(u8 *cbc_chain_data, u8 *src, u8 *dst);
/**
* aes_cbc_encrypt_blocks() - Encrypt multiple blocks of data with AES CBC.
*
* @key_exp Expanded key to use
* @src Source data to encrypt
* @dst Destination buffer
* @num_aes_blocks Number of AES blocks to encrypt
*/
void aes_cbc_encrypt_blocks(u8 *key_exp, u8 *src, u8 *dst, u32 num_aes_blocks);
/**
* Decrypt multiple blocks of data with AES CBC.
*
* @key_exp Expanded key to use
* @src Source data to decrypt
* @dst Destination buffer
* @num_aes_blocks Number of AES blocks to decrypt
*/
void aes_cbc_decrypt_blocks(u8 *key_exp, u8 *src, u8 *dst, u32 num_aes_blocks);
#endif /* _AES_REF_H_ */