forked from Minki/linux
50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
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/*
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* linux/fs/ext4/ext4_crypto.h
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*
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* Copyright (C) 2015, Google, Inc.
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*
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* This contains encryption header content for ext4
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*
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* Written by Michael Halcrow, 2015.
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*/
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#ifndef _EXT4_CRYPTO_H
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#define _EXT4_CRYPTO_H
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#include <linux/fs.h>
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#define EXT4_KEY_DESCRIPTOR_SIZE 8
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/* Policy provided via an ioctl on the topmost directory */
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struct ext4_encryption_policy {
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char version;
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char contents_encryption_mode;
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char filenames_encryption_mode;
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char master_key_descriptor[EXT4_KEY_DESCRIPTOR_SIZE];
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} __attribute__((__packed__));
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#define EXT4_ENCRYPTION_CONTEXT_FORMAT_V1 1
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#define EXT4_KEY_DERIVATION_NONCE_SIZE 16
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/**
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* Encryption context for inode
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*
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* Protector format:
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* 1 byte: Protector format (1 = this version)
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* 1 byte: File contents encryption mode
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* 1 byte: File names encryption mode
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* 1 byte: Reserved
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* 8 bytes: Master Key descriptor
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* 16 bytes: Encryption Key derivation nonce
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*/
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struct ext4_encryption_context {
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char format;
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char contents_encryption_mode;
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char filenames_encryption_mode;
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char reserved;
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char master_key_descriptor[EXT4_KEY_DESCRIPTOR_SIZE];
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char nonce[EXT4_KEY_DERIVATION_NONCE_SIZE];
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} __attribute__((__packed__));
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#endif /* _EXT4_CRYPTO_H */
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