/* * 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_ */