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authorEric Biggers <ebiggers@google.com>2018-01-05 21:44:58 +0300
committerTheodore Ts'o <tytso@mit.edu>2018-01-12 06:06:18 +0300
commitbb8179e5a8509876415c0eac6f6ba8a130b3cb47 (patch)
tree6889d1baa5a6ed7471f5e17ba549889dbeebcc3a /fs/crypto
parentbdd234764769a267794f275ce96706a466d376d7 (diff)
downloadlinux-bb8179e5a8509876415c0eac6f6ba8a130b3cb47.tar.xz
fscrypt: move fscrypt_valid_enc_modes() to fscrypt_private.h
The encryption modes are validated by fs/crypto/, not by individual filesystems. Therefore, move fscrypt_valid_enc_modes() from fscrypt.h to fscrypt_private.h. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/crypto')
-rw-r--r--fs/crypto/fscrypt_private.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/fs/crypto/fscrypt_private.h b/fs/crypto/fscrypt_private.h
index 823c43a00bf7..2b848e7c92f0 100644
--- a/fs/crypto/fscrypt_private.h
+++ b/fs/crypto/fscrypt_private.h
@@ -71,6 +71,20 @@ typedef enum {
#define FS_CTX_REQUIRES_FREE_ENCRYPT_FL 0x00000001
#define FS_CTX_HAS_BOUNCE_BUFFER_FL 0x00000002
+static inline bool fscrypt_valid_enc_modes(u32 contents_mode,
+ u32 filenames_mode)
+{
+ if (contents_mode == FS_ENCRYPTION_MODE_AES_128_CBC &&
+ filenames_mode == FS_ENCRYPTION_MODE_AES_128_CTS)
+ return true;
+
+ if (contents_mode == FS_ENCRYPTION_MODE_AES_256_XTS &&
+ filenames_mode == FS_ENCRYPTION_MODE_AES_256_CTS)
+ return true;
+
+ return false;
+}
+
/* crypto.c */
extern struct kmem_cache *fscrypt_info_cachep;
extern int fscrypt_initialize(unsigned int cop_flags);