[people/ms/u-boot.git] / include / uboot_aes.h

/*
 * 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_ */
Commit	Line	Data
5b1a5451 YL	1	/*
	2	* Copyright (c) 2011 The Chromium OS Authors.
	3	* (C) Copyright 2010 - 2011 NVIDIA Corporation <www.nvidia.com>
	4	*
1a459660	5	* SPDX-License-Identifier: GPL-2.0+
5b1a5451 YL	6	*/
	7
	8	#ifndef _AES_REF_H_
	9	#define _AES_REF_H_
	10
a8a752c0 MV	11	#ifdef USE_HOSTCC
	12	/* Define compat stuff for use in fw_* tools. */
	13	typedef unsigned char u8;
	14	typedef unsigned int u32;
	15	#define debug(...) do {} while (0)
	16	#endif
	17
5b1a5451 YL	18	/*
	19	* AES encryption library, with small code size, supporting only 128-bit AES
	20	*
	21	* AES is a stream cipher which works a block at a time, with each block
	22	* in this case being AES_KEY_LENGTH bytes.
	23	*/
	24
	25	enum {
	26	AES_STATECOLS = 4, /* columns in the state & expanded key */
	27	AES_KEYCOLS = 4, /* columns in a key */
	28	AES_ROUNDS = 10, /* rounds in encryption */
	29
	30	AES_KEY_LENGTH = 128 / 8,
	31	AES_EXPAND_KEY_LENGTH = 4 * AES_STATECOLS * (AES_ROUNDS + 1),
	32	};
	33
	34	/**
957ba85c MV	35	* aes_expand_key() - Expand the AES key
957ba85c MV	36	*
5b1a5451 YL	37	* Expand a key into a key schedule, which is then used for the other
	38	* operations.
	39	*
957ba85c MV	40	* @key Key, of length AES_KEY_LENGTH bytes
957ba85c MV	41	* @expkey Buffer to place expanded key, AES_EXPAND_KEY_LENGTH
5b1a5451 YL	42	*/
	43	void aes_expand_key(u8 key, u8 expkey);
	44
	45	/**
957ba85c	46	* aes_encrypt() - Encrypt single block of data with AES 128
5b1a5451	47	*
957ba85c MV	48	* @in Input data
	49	* @expkey Expanded key to use for encryption (from aes_expand_key())
	50	* @out Output data
5b1a5451 YL	51	*/
	52	void aes_encrypt(u8 in, u8 expkey, u8 *out);
	53
	54	/**
957ba85c	55	* aes_decrypt() - Decrypt single block of data with AES 128
5b1a5451	56	*
957ba85c MV	57	* @in Input data
	58	* @expkey Expanded key to use for decryption (from aes_expand_key())
	59	* @out Output data
5b1a5451 YL	60	*/
	61	void aes_decrypt(u8 in, u8 expkey, u8 *out);
	62
53eb768d SW	63	/**
	64	* Apply chain data to the destination using EOR
	65	*
	66	* Each array is of length AES_KEY_LENGTH.
	67	*
	68	* @cbc_chain_data Chain data
	69	* @src Source data
	70	* @dst Destination data, which is modified here
	71	*/
	72	void aes_apply_cbc_chain_data(u8 cbc_chain_data, u8 src, u8 *dst);
	73
6e7b9f4f MV	74	/**
	75	* aes_cbc_encrypt_blocks() - Encrypt multiple blocks of data with AES CBC.
	76	*
	77	* @key_exp Expanded key to use
	78	* @src Source data to encrypt
	79	* @dst Destination buffer
	80	* @num_aes_blocks Number of AES blocks to encrypt
	81	*/
	82	void aes_cbc_encrypt_blocks(u8 key_exp, u8 src, u8 *dst, u32 num_aes_blocks);
	83
dc24bb6d MV	84	/**
	85	* Decrypt multiple blocks of data with AES CBC.
	86	*
	87	* @key_exp Expanded key to use
	88	* @src Source data to decrypt
	89	* @dst Destination buffer
	90	* @num_aes_blocks Number of AES blocks to decrypt
	91	*/
	92	void aes_cbc_decrypt_blocks(u8 key_exp, u8 src, u8 *dst, u32 num_aes_blocks);
	93
5b1a5451	94	#endif /* _AES_REF_H_ */