1 # SPDX-License-Identifier: GPL-2.0-only
2 config FS_ENCRYPTION
3 bool "FS Encryption (Per-file encryption)"
4 select CRYPTO
5 select CRYPTO_HASH
6 select CRYPTO_SKCIPHER
7 select CRYPTO_LIB_SHA256
8 select KEYS
9 help
10 Enable encryption of files and directories. This
11 feature is similar to ecryptfs, but it is more memory
12 efficient since it avoids caching the encrypted and
13 decrypted pages in the page cache. Currently Ext4,
14 F2FS, UBIFS, and CephFS make use of this feature.
15
16 # Filesystems supporting encryption must select this if FS_ENCRYPTION. This
17 # allows the algorithms to be built as modules when all the filesystems are,
18 # whereas selecting them from FS_ENCRYPTION would force them to be built-in.
19 #
20 # Note: this option only pulls in the algorithms that filesystem encryption
21 # needs "by default". If userspace will use "non-default" encryption modes such
22 # as Adiantum encryption, then those other modes need to be explicitly enabled
23 # in the crypto API; see Documentation/filesystems/fscrypt.rst for details.
24 #
25 # Also note that this option only pulls in the generic implementations of the
26 # algorithms, not any per-architecture optimized implementations. It is
27 # strongly recommended to enable optimized implementations too. It is safe to
28 # disable these generic implementations if corresponding optimized
29 # implementations will always be available too; for this reason, these are soft
30 # dependencies ('imply' rather than 'select'). Only disable these generic
31 # implementations if you're sure they will never be needed, though.
32 config FS_ENCRYPTION_ALGS
33 tristate
34 imply CRYPTO_AES
35 imply CRYPTO_CBC
36 imply CRYPTO_CTS
37 imply CRYPTO_ECB
38 imply CRYPTO_HMAC
39 imply CRYPTO_SHA512
40 imply CRYPTO_XTS
41
42 config FS_ENCRYPTION_INLINE_CRYPT
43 bool "Enable fscrypt to use inline crypto"
44 depends on FS_ENCRYPTION && BLK_INLINE_ENCRYPTION
45 help
46 Enable fscrypt to use inline encryption hardware if available.
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