83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2011 The Chromium OS Authors.
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* (C) Copyright 2010 - 2011 NVIDIA Corporation <www.nvidia.com>
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*/
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#ifndef _AES_REF_H_
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#define _AES_REF_H_
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#ifdef USE_HOSTCC
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/* Define compat stuff for use in fw_* tools. */
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typedef unsigned char u8;
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typedef unsigned int u32;
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#define debug(...) do {} while (0)
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#endif
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/*
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* AES encryption library, with small code size, supporting only 128-bit AES
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*
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* AES is a stream cipher which works a block at a time, with each block
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* in this case being AES_KEY_LENGTH bytes.
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*/
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enum {
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AES_STATECOLS = 4, /* columns in the state & expanded key */
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AES_KEYCOLS = 4, /* columns in a key */
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AES_ROUNDS = 10, /* rounds in encryption */
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AES_KEY_LENGTH = 128 / 8,
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AES_EXPAND_KEY_LENGTH = 4 * AES_STATECOLS * (AES_ROUNDS + 1),
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};
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/**
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* aes_expand_key() - Expand the AES key
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*
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* Expand a key into a key schedule, which is then used for the other
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* operations.
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*
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* @key Key, of length AES_KEY_LENGTH bytes
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* @expkey Buffer to place expanded key, AES_EXPAND_KEY_LENGTH
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*/
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void aes_expand_key(u8 *key, u8 *expkey);
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/**
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* aes_encrypt() - Encrypt single block of data with AES 128
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*
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* @in Input data
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* @expkey Expanded key to use for encryption (from aes_expand_key())
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* @out Output data
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*/
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void aes_encrypt(u8 *in, u8 *expkey, u8 *out);
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/**
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* aes_decrypt() - Decrypt single block of data with AES 128
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*
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* @in Input data
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* @expkey Expanded key to use for decryption (from aes_expand_key())
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* @out Output data
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*/
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void aes_decrypt(u8 *in, u8 *expkey, u8 *out);
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/**
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* Apply chain data to the destination using EOR
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*
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* Each array is of length AES_KEY_LENGTH.
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*
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* @cbc_chain_data Chain data
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* @src Source data
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* @dst Destination data, which is modified here
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*/
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void aes_apply_cbc_chain_data(u8 *cbc_chain_data, u8 *src, u8 *dst);
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/**
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* aes_cbc_encrypt_blocks() - Encrypt multiple blocks of data with AES CBC.
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*
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* @key_exp Expanded key to use
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* @iv Initialization vector
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* @src Source data to encrypt
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* @dst Destination buffer
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* @num_aes_blocks Number of AES blocks to encrypt
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*/
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void aes_cbc_encrypt_blocks(u8 *key_exp, u8 *iv, u8 *src, u8 *dst,
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u32 num_aes_blocks);
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/**
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* Decrypt multiple blocks of data with AES CBC.
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*
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* @key_exp Expanded key to use
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* @iv Initialization vector
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* @src Source data to decrypt
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* @dst Destination buffer
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* @num_aes_blocks Number of AES blocks to decrypt
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*/
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void aes_cbc_decrypt_blocks(u8 *key_exp, u8 *iv, u8 *src, u8 *dst,
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u32 num_aes_blocks);
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#endif /* _AES_REF_H_ */
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