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include/uboot_aes.h
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/* SPDX-License-Identifier: GPL-2.0+ */ |
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/* * Copyright (c) 2011 The Chromium OS Authors. * (C) Copyright 2010 - 2011 NVIDIA Corporation <www.nvidia.com> |
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*/ #ifndef _AES_REF_H_ #define _AES_REF_H_ |
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#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 |
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/* * 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 |
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* in this case being AES_BLOCK_LENGTH bytes. |
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*/ enum { AES_STATECOLS = 4, /* columns in the state & expanded key */ |
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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), |
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AES_BLOCK_LENGTH = 128 / 8, |
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}; /** |
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* aes_expand_key() - Expand the AES key * |
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* Expand a key into a key schedule, which is then used for the other * operations. * |
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* @key Key * @key_size Size of the key (in bits) |
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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, u32 key_size, 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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* @key_size Size of the aes key (in bits) |
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* @in Input data * @expkey Expanded key to use for encryption (from aes_expand_key()) * @out Output data |
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*/ |
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void aes_encrypt(u32 key_size, 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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* @key_size Size of the aes key (in bits) |
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* @in Input data * @expkey Expanded key to use for decryption (from aes_expand_key()) * @out Output data |
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*/ |
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void aes_decrypt(u32 key_size, 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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* Each array is of length AES_BLOCK_LENGTH. |
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* * @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); /** |
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* aes_cbc_encrypt_blocks() - Encrypt multiple blocks of data with AES CBC. * |
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* @key_size Size of the aes key (in bits) |
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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 * @dst Destination buffer * @num_aes_blocks Number of AES blocks to encrypt */ |
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void aes_cbc_encrypt_blocks(u32 key_size, u8 *key_exp, u8 *iv, u8 *src, u8 *dst, |
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u32 num_aes_blocks); |
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/** * Decrypt multiple blocks of data with AES CBC. * |
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* @key_size Size of the aes key (in bits) |
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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 * @dst Destination buffer * @num_aes_blocks Number of AES blocks to decrypt */ |
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void aes_cbc_decrypt_blocks(u32 key_size, 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_ */ |