/* * 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_ /* * 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), }; /** * Expand a key into a key schedule, which is then used for the other * operations. * * \param key Key, of length AES_KEY_LENGTH bytes * \param expkey Buffer to place expanded key, AES_EXPAND_KEY_LENGTH */ void aes_expand_key(u8 *key, u8 *expkey); /** * Encrypt a single block of data * * 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); /** * Decrypt a single block of data * * 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); #endif /* _AES_REF_H_ */