/* SPDX-License-Identifier: GPL-2.0+ */

  /*
   * Copyright (c) 2011 The Chromium OS Authors.
   * (C) Copyright 2010 - 2011 NVIDIA Corporation <www.nvidia.com>

   */
  
  #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_BLOCK_LENGTH bytes.

   */
  
  enum {
  	AES_STATECOLS	= 4,	/* columns in the state & expanded key */

  	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),

  	AES_BLOCK_LENGTH	= 128 / 8,

  };
  
  /**

   * aes_expand_key() - Expand the AES key
   *

   * Expand a key into a key schedule, which is then used for the other
   * operations.
   *

   * @key		Key
   * @key_size	Size of the key (in bits)

   * @expkey	Buffer to place expanded key, AES_EXPAND_KEY_LENGTH

   */

  void aes_expand_key(u8 *key, u32 key_size, u8 *expkey);

  
  /**

   * aes_encrypt() - Encrypt single block of data with AES 128

   *

   * @key_size	Size of the aes key (in bits)

   * @in		Input data
   * @expkey	Expanded key to use for encryption (from aes_expand_key())
   * @out		Output data

   */

  void aes_encrypt(u32 key_size, u8 *in, u8 *expkey, u8 *out);

  
  /**

   * aes_decrypt() - Decrypt single block of data with AES 128

   *

   * @key_size	Size of the aes key (in bits)

   * @in		Input data
   * @expkey	Expanded key to use for decryption (from aes_expand_key())
   * @out		Output data

   */

  void aes_decrypt(u32 key_size, u8 *in, u8 *expkey, u8 *out);

  /**

   * Apply chain data to the destination using EOR
   *

   * Each array is of length AES_BLOCK_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_size		Size of the aes key (in bits)

   * @key_exp		Expanded key to use

   * @iv			Initialization vector

   * @src			Source data to encrypt
   * @dst			Destination buffer
   * @num_aes_blocks	Number of AES blocks to encrypt
   */

  void aes_cbc_encrypt_blocks(u32 key_size, u8 *key_exp, u8 *iv, u8 *src, u8 *dst,

  			    u32 num_aes_blocks);

  /**
   * Decrypt multiple blocks of data with AES CBC.
   *

   * @key_size		Size of the aes key (in bits)

   * @key_exp		Expanded key to use

   * @iv			Initialization vector

   * @src			Source data to decrypt
   * @dst			Destination buffer
   * @num_aes_blocks	Number of AES blocks to decrypt
   */

  void aes_cbc_decrypt_blocks(u32 key_size, u8 *key_exp, u8 *iv, u8 *src, u8 *dst,

  			    u32 num_aes_blocks);

  #endif /* _AES_REF_H_ */