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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_ */
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