[thirdparty/u-boot.git] / include / uboot_aes.h

/* 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_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
 * @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(u8 *key_exp, u8 *iv, u8 *src, u8 *dst,
			    u32 num_aes_blocks);

/**
 * Decrypt multiple blocks of data with AES CBC.
 *
 * @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(u8 *key_exp, u8 *iv, u8 *src, u8 *dst,
			    u32 num_aes_blocks);

#endif /* _AES_REF_H_ */
Commit	Line	Data
83d290c5	1	/* SPDX-License-Identifier: GPL-2.0+ */
5b1a5451 YL	2	/*
	3	* Copyright (c) 2011 The Chromium OS Authors.
	4	* (C) Copyright 2010 - 2011 NVIDIA Corporation <www.nvidia.com>
5b1a5451 YL	5	*/
	6
	7	#ifndef _AES_REF_H_
	8	#define _AES_REF_H_
	9
a8a752c0 MV	10	#ifdef USE_HOSTCC
	11	/* Define compat stuff for use in fw_* tools. */
	12	typedef unsigned char u8;
	13	typedef unsigned int u32;
	14	#define debug(...) do {} while (0)
	15	#endif
	16
5b1a5451 YL	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
	24	enum {
	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	/**
957ba85c MV	34	* aes_expand_key() - Expand the AES key
957ba85c MV	35	*
5b1a5451 YL	36	* Expand a key into a key schedule, which is then used for the other
	37	* operations.
	38	*
957ba85c MV	39	* @key Key, of length AES_KEY_LENGTH bytes
957ba85c MV	40	* @expkey Buffer to place expanded key, AES_EXPAND_KEY_LENGTH
5b1a5451 YL	41	*/
	42	void aes_expand_key(u8 key, u8 expkey);
	43
	44	/**
957ba85c	45	* aes_encrypt() - Encrypt single block of data with AES 128
5b1a5451	46	*
957ba85c MV	47	* @in Input data
	48	* @expkey Expanded key to use for encryption (from aes_expand_key())
	49	* @out Output data
5b1a5451 YL	50	*/
	51	void aes_encrypt(u8 in, u8 expkey, u8 *out);
	52
	53	/**
957ba85c	54	* aes_decrypt() - Decrypt single block of data with AES 128
5b1a5451	55	*
957ba85c MV	56	* @in Input data
	57	* @expkey Expanded key to use for decryption (from aes_expand_key())
	58	* @out Output data
5b1a5451 YL	59	*/
	60	void aes_decrypt(u8 in, u8 expkey, u8 *out);
	61
53eb768d SW	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	*/
	71	void aes_apply_cbc_chain_data(u8 cbc_chain_data, u8 src, u8 *dst);
	72
6e7b9f4f MV	73	/**
	74	* aes_cbc_encrypt_blocks() - Encrypt multiple blocks of data with AES CBC.
	75	*
	76	* @key_exp Expanded key to use
af09eba6	77	* @iv Initialization vector
6e7b9f4f MV	78	* @src Source data to encrypt
	79	* @dst Destination buffer
	80	* @num_aes_blocks Number of AES blocks to encrypt
	81	*/
af09eba6 АМ	82	void aes_cbc_encrypt_blocks(u8 key_exp, u8 iv, u8 src, u8 dst,
af09eba6 АМ	83	u32 num_aes_blocks);
6e7b9f4f	84
dc24bb6d MV	85	/**
	86	* Decrypt multiple blocks of data with AES CBC.
	87	*
	88	* @key_exp Expanded key to use
af09eba6	89	* @iv Initialization vector
dc24bb6d MV	90	* @src Source data to decrypt
	91	* @dst Destination buffer
	92	* @num_aes_blocks Number of AES blocks to decrypt
	93	*/
af09eba6 АМ	94	void aes_cbc_decrypt_blocks(u8 key_exp, u8 iv, u8 src, u8 dst,
af09eba6 АМ	95	u32 num_aes_blocks);
dc24bb6d	96
5b1a5451	97	#endif /* _AES_REF_H_ */