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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (c) 2011 The Chromium OS Authors.
* (C) Copyright 2010 - 2011 NVIDIA Corporation <www.nvidia.com>
*/
#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_BLOCK_LENGTH bytes.
*/
enum {
AES_STATECOLS = 4, /* columns in the state & expanded key */
AES128_KEYCOLS = 4, /* columns in a key for aes128 */
AES192_KEYCOLS = 6, /* columns in a key for aes128 */
AES256_KEYCOLS = 8, /* columns in a key for aes128 */
AES128_ROUNDS = 10, /* rounds in encryption for aes128 */
AES192_ROUNDS = 12, /* rounds in encryption for aes192 */
AES256_ROUNDS = 14, /* rounds in encryption for aes256 */
AES128_KEY_LENGTH = 128 / 8,
AES192_KEY_LENGTH = 192 / 8,
AES256_KEY_LENGTH = 256 / 8,
AES128_EXPAND_KEY_LENGTH = 4 * AES_STATECOLS * (AES128_ROUNDS + 1),
AES192_EXPAND_KEY_LENGTH = 4 * AES_STATECOLS * (AES192_ROUNDS + 1),
AES256_EXPAND_KEY_LENGTH = 4 * AES_STATECOLS * (AES256_ROUNDS + 1),
AES_BLOCK_LENGTH = 128 / 8,
};
/**
* aes_expand_key() - Expand the AES key
*
* Expand a key into a key schedule, which is then used for the other
* operations.
*
* @key Key
* @key_size Size of the key (in bits)
* @expkey Buffer to place expanded key, AES_EXPAND_KEY_LENGTH
*/
void aes_expand_key(u8 *key, u32 key_size, u8 *expkey);
/**
* aes_encrypt() - Encrypt single block of data with AES 128
*
* @key_size Size of the aes key (in bits)
* @in Input data
* @expkey Expanded key to use for encryption (from aes_expand_key())
* @out Output data
*/
void aes_encrypt(u32 key_size, u8 *in, u8 *expkey, u8 *out);
/**
* aes_decrypt() - Decrypt single block of data with AES 128
*
* @key_size Size of the aes key (in bits)
* @in Input data
* @expkey Expanded key to use for decryption (from aes_expand_key())
* @out Output data
*/
void aes_decrypt(u32 key_size, u8 *in, u8 *expkey, u8 *out);
/**
* Apply chain data to the destination using EOR
*
* Each array is of length AES_BLOCK_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_size Size of the aes key (in bits)
* @key_exp Expanded key to use
* @iv Initialization vector
* @src Source data to encrypt
* @dst Destination buffer
* @num_aes_blocks Number of AES blocks to encrypt
*/
void aes_cbc_encrypt_blocks(u32 key_size, u8 *key_exp, u8 *iv, u8 *src, u8 *dst,
u32 num_aes_blocks);
/**
* Decrypt multiple blocks of data with AES CBC.
*
* @key_size Size of the aes key (in bits)
* @key_exp Expanded key to use
* @iv Initialization vector
* @src Source data to decrypt
* @dst Destination buffer
* @num_aes_blocks Number of AES blocks to decrypt
*/
void aes_cbc_decrypt_blocks(u32 key_size, u8 *key_exp, u8 *iv, u8 *src, u8 *dst,
u32 num_aes_blocks);
#endif /* _AES_REF_H_ */
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