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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
3325bea5 TT |
2 | /* |
3 | * fscrypt_private.h | |
4 | * | |
5 | * Copyright (C) 2015, Google, Inc. | |
6 | * | |
7 | * This contains encryption key functions. | |
8 | * | |
9 | * Written by Michael Halcrow, Ildar Muslukhov, and Uday Savagaonkar, 2015. | |
10 | */ | |
11 | ||
12 | #ifndef _FSCRYPT_PRIVATE_H | |
13 | #define _FSCRYPT_PRIVATE_H | |
14 | ||
46f47e48 | 15 | #include <linux/fscrypt_supp.h> |
b7e7cf7a | 16 | #include <crypto/hash.h> |
3325bea5 | 17 | |
cc4e0df0 | 18 | /* Encryption parameters */ |
b7e7cf7a | 19 | #define FS_IV_SIZE 16 |
cc4e0df0 | 20 | #define FS_AES_128_ECB_KEY_SIZE 16 |
b7e7cf7a DW |
21 | #define FS_AES_128_CBC_KEY_SIZE 16 |
22 | #define FS_AES_128_CTS_KEY_SIZE 16 | |
cc4e0df0 TT |
23 | #define FS_AES_256_GCM_KEY_SIZE 32 |
24 | #define FS_AES_256_CBC_KEY_SIZE 32 | |
25 | #define FS_AES_256_CTS_KEY_SIZE 32 | |
26 | #define FS_AES_256_XTS_KEY_SIZE 64 | |
cc4e0df0 TT |
27 | |
28 | #define FS_KEY_DERIVATION_NONCE_SIZE 16 | |
29 | ||
30 | /** | |
31 | * Encryption context for inode | |
32 | * | |
33 | * Protector format: | |
34 | * 1 byte: Protector format (1 = this version) | |
35 | * 1 byte: File contents encryption mode | |
36 | * 1 byte: File names encryption mode | |
37 | * 1 byte: Flags | |
38 | * 8 bytes: Master Key descriptor | |
39 | * 16 bytes: Encryption Key derivation nonce | |
40 | */ | |
41 | struct fscrypt_context { | |
42 | u8 format; | |
43 | u8 contents_encryption_mode; | |
44 | u8 filenames_encryption_mode; | |
45 | u8 flags; | |
46 | u8 master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE]; | |
47 | u8 nonce[FS_KEY_DERIVATION_NONCE_SIZE]; | |
48 | } __packed; | |
49 | ||
50 | #define FS_ENCRYPTION_CONTEXT_FORMAT_V1 1 | |
51 | ||
cc4e0df0 TT |
52 | /* |
53 | * A pointer to this structure is stored in the file system's in-core | |
54 | * representation of an inode. | |
55 | */ | |
56 | struct fscrypt_info { | |
57 | u8 ci_data_mode; | |
58 | u8 ci_filename_mode; | |
59 | u8 ci_flags; | |
60 | struct crypto_skcipher *ci_ctfm; | |
b7e7cf7a | 61 | struct crypto_cipher *ci_essiv_tfm; |
cc4e0df0 TT |
62 | u8 ci_master_key[FS_KEY_DESCRIPTOR_SIZE]; |
63 | }; | |
64 | ||
58ae7468 RW |
65 | typedef enum { |
66 | FS_DECRYPT = 0, | |
67 | FS_ENCRYPT, | |
68 | } fscrypt_direction_t; | |
69 | ||
cc4e0df0 | 70 | #define FS_CTX_REQUIRES_FREE_ENCRYPT_FL 0x00000001 |
6a34e4d2 | 71 | #define FS_CTX_HAS_BOUNCE_BUFFER_FL 0x00000002 |
cc4e0df0 TT |
72 | |
73 | struct fscrypt_completion_result { | |
74 | struct completion completion; | |
75 | int res; | |
76 | }; | |
77 | ||
78 | #define DECLARE_FS_COMPLETION_RESULT(ecr) \ | |
79 | struct fscrypt_completion_result ecr = { \ | |
b14c8e6a | 80 | COMPLETION_INITIALIZER_ONSTACK((ecr).completion), 0 } |
cc4e0df0 TT |
81 | |
82 | ||
b98701df | 83 | /* crypto.c */ |
58ae7468 RW |
84 | extern int fscrypt_initialize(unsigned int cop_flags); |
85 | extern struct workqueue_struct *fscrypt_read_workqueue; | |
86 | extern int fscrypt_do_page_crypto(const struct inode *inode, | |
87 | fscrypt_direction_t rw, u64 lblk_num, | |
88 | struct page *src_page, | |
89 | struct page *dest_page, | |
90 | unsigned int len, unsigned int offs, | |
91 | gfp_t gfp_flags); | |
92 | extern struct page *fscrypt_alloc_bounce_page(struct fscrypt_ctx *ctx, | |
93 | gfp_t gfp_flags); | |
b98701df | 94 | |
b7e7cf7a DW |
95 | /* keyinfo.c */ |
96 | extern void __exit fscrypt_essiv_cleanup(void); | |
97 | ||
3325bea5 | 98 | #endif /* _FSCRYPT_PRIVATE_H */ |