LXR uboot/include/uboot

   1/* SPDX-License-Identifier: GPL-2.0+ */
   2/*
   3 * Copyright (c) 2011 The Chromium OS Authors.
   4 * (C) Copyright 2010 - 2011 NVIDIA Corporation <www.nvidia.com>
   5 */
   6
   7#ifndef _AES_REF_H_
   8#define _AES_REF_H_
   9
  10#ifdef USE_HOSTCC
  11/* Define compat stuff for use in fw_* tools. */
  12typedef unsigned char u8;
  13typedef unsigned int u32;
  14#define debug(...) do {} while (0)
  15#endif
  16
  17/*
  18 * AES encryption library, with small code size, supporting only 128-bit AES
  19 *
  20 * AES is a stream cipher which works a block at a time, with each block
  21 * in this case being AES_KEY_LENGTH bytes.
  22 */
  23
  24enum {
  25        AES_STATECOLS   = 4,    /* columns in the state & expanded key */
  26        AES_KEYCOLS     = 4,    /* columns in a key */
  27        AES_ROUNDS      = 10,   /* rounds in encryption */
  28
  29        AES_KEY_LENGTH  = 128 / 8,
  30        AES_EXPAND_KEY_LENGTH   = 4 * AES_STATECOLS * (AES_ROUNDS + 1),
  31};
  32
  33/**
  34 * aes_expand_key() - Expand the AES key
  35 *
  36 * Expand a key into a key schedule, which is then used for the other
  37 * operations.
  38 *
  39 * @key         Key, of length AES_KEY_LENGTH bytes
  40 * @expkey      Buffer to place expanded key, AES_EXPAND_KEY_LENGTH
  41 */
  42void aes_expand_key(u8 *key, u8 *expkey);
  43
  44/**
  45 * aes_encrypt() - Encrypt single block of data with AES 128
  46 *
  47 * @in          Input data
  48 * @expkey      Expanded key to use for encryption (from aes_expand_key())
  49 * @out         Output data
  50 */
  51void aes_encrypt(u8 *in, u8 *expkey, u8 *out);
  52
  53/**
  54 * aes_decrypt() - Decrypt single block of data with AES 128
  55 *
  56 * @in          Input data
  57 * @expkey      Expanded key to use for decryption (from aes_expand_key())
  58 * @out         Output data
  59 */
  60void aes_decrypt(u8 *in, u8 *expkey, u8 *out);
  61
  62/**
  63 * Apply chain data to the destination using EOR
  64 *
  65 * Each array is of length AES_KEY_LENGTH.
  66 *
  67 * @cbc_chain_data      Chain data
  68 * @src                 Source data
  69 * @dst                 Destination data, which is modified here
  70 */
  71void aes_apply_cbc_chain_data(u8 *cbc_chain_data, u8 *src, u8 *dst);
  72
  73/**
  74 * aes_cbc_encrypt_blocks() - Encrypt multiple blocks of data with AES CBC.
  75 *
  76 * @key_exp             Expanded key to use
  77 * @iv                  Initialization vector
  78 * @src                 Source data to encrypt
  79 * @dst                 Destination buffer
  80 * @num_aes_blocks      Number of AES blocks to encrypt
  81 */
  82void aes_cbc_encrypt_blocks(u8 *key_exp, u8 *iv, u8 *src, u8 *dst,
  83                            u32 num_aes_blocks);
  84
  85/**
  86 * Decrypt multiple blocks of data with AES CBC.
  87 *
  88 * @key_exp             Expanded key to use
  89 * @iv                  Initialization vector
  90 * @src                 Source data to decrypt
  91 * @dst                 Destination buffer
  92 * @num_aes_blocks      Number of AES blocks to decrypt
  93 */
  94void aes_cbc_decrypt_blocks(u8 *key_exp, u8 *iv, u8 *src, u8 *dst,
  95                            u32 num_aes_blocks);
  96
  97#endif /* _AES_REF_H_ */
  98