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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright 2019 Google LLC
*/
#ifndef __LINUX_BLK_CRYPTO_H
#define __LINUX_BLK_CRYPTO_H
enum blk_crypto_mode_num {
BLK_ENCRYPTION_MODE_INVALID,
BLK_ENCRYPTION_MODE_AES_256_XTS,
BLK_ENCRYPTION_MODE_AES_128_CBC_ESSIV,
BLK_ENCRYPTION_MODE_ADIANTUM,
BLK_ENCRYPTION_MODE_MAX,
};
#define BLK_CRYPTO_MAX_KEY_SIZE 64
/**
* struct blk_crypto_config - an inline encryption key's crypto configuration
* @crypto_mode: encryption algorithm this key is for
* @data_unit_size: the data unit size for all encryption/decryptions with this
* key. This is the size in bytes of each individual plaintext and
* ciphertext. This is always a power of 2. It might be e.g. the
* filesystem block size or the disk sector size.
* @dun_bytes: the maximum number of bytes of DUN used when using this key
*/
struct blk_crypto_config {
enum blk_crypto_mode_num crypto_mode;
unsigned int data_unit_size;
unsigned int dun_bytes;
};
/**
* struct blk_crypto_key - an inline encryption key
* @crypto_cfg: the crypto configuration (like crypto_mode, key size) for this
* key
* @data_unit_size_bits: log2 of data_unit_size
* @size: size of this key in bytes (determined by @crypto_cfg.crypto_mode)
* @raw: the raw bytes of this key. Only the first @size bytes are used.
*
* A blk_crypto_key is immutable once created, and many bios can reference it at
* the same time. It must not be freed until all bios using it have completed
* and it has been evicted from all devices on which it may have been used.
*/
struct blk_crypto_key {
struct blk_crypto_config crypto_cfg;
unsigned int data_unit_size_bits;
unsigned int size;
u8 raw[BLK_CRYPTO_MAX_KEY_SIZE];
};
#endif /* __LINUX_BLK_CRYPTO_H */
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