This patch series implements file level encryption for UBIFS. It makes use of the generic fscrypto framework as used by ext4 and f2fs. Among file contents also file names are encrypted, for more details on fscrypto please see  and .
To support encrypted files in UBIFS multiple preparations were needed. UBIFS has a different IO model than ext4 and f2fs because it uses MTD instead of the block layer. But the changes are small and non-invasive. In UBIFS itself the biggest change was supporting hash lookups. Now UBIFS is able to provide a 64bit cookie which can be used later to locate a file. This change will also allow us implementing proper NFS and telldir() support, but that will be a different patch series. Because of these changes the UBIFS write version is now 5. As userspace component I'm currently using e4crypt from e2fsprogs with EXT2FS_KEY_DESC_PREFIX set to "fscrypt:" instead of "ext4:". A common tool will hopefully emerge soon. I don't want an UBIFS specific tool in mtd-utils. The series is based on the fscrypt tree. It can be obtained from: git://git.infradead.org/users/rw/linux.git ubifs_crypt_v3 Sorry for the off-by-one in the version number, starting with v0 was not a good idea. ;-\  https://lwn.net/Articles/639427/  https://docs.google.com/document/d/1ft26lUQyuSpiu6VleP70_npaWdRfXFoNnB8JYnykNTg/edit  http://www.spinics.net/lists/linux-fsdevel/msg103107.html  git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git fscrypt Changes since v1, http://lists.infradead.org/pipermail/linux-mtd/2016-November/070268.html - Rebased to Ted's fscrypt tree, this tree contains also David's fscrypo specific changes - Fixed a build regression Changes since v0, https://lwn.net/Articles/704261/ - Rebased to v4.9-rc4 - Made fscrypto functions generic instead of adding new versions (hch) - Addressed various comments (Eric and Ted) Richard Weinberger (24): ubifs: Export ubifs_check_dir_empty() ubifs: Export xattr get and set functions ubifs: Define UBIFS crypto context xattr ubifs: Add skeleton for fscrypto ubifs: Massage ubifs_listxattr() for encryption context ubifs: Implement directory open operation ubifs: Implement file open operation ubifs: Enforce crypto policy in ->link and ->rename ubifs: Preload crypto context in ->lookup() ubifs: Massage assert in ubifs_xattr_set() wrt. fscrypto ubifs: Enforce crypto policy in mmap ubifs: Introduce new data node field, compr_size ubifs: Constify struct inode pointer in ubifs_crypt_is_encrypted() ubifs: Implement encrypt/decrypt for all IO ubifs: Relax checks in ubifs_validate_entry() ubifs: Make r5 hash binary string aware ubifs: Implement encrypted filenames ubifs: Add support for encrypted symlinks ubifs: Rename tnc_read_node_nm ubifs: Add full hash lookup support ubifs: Use a random number for cookies ubifs: Implement UBIFS_FLG_DOUBLE_HASH ubifs: Implement UBIFS_FLG_ENCRYPTION ubifs: Raise write version to 5 fs/ubifs/Kconfig | 11 ++ fs/ubifs/Makefile | 1 + fs/ubifs/crypto.c | 97 ++++++++++ fs/ubifs/debug.c | 14 +- fs/ubifs/dir.c | 478 +++++++++++++++++++++++++++++++++++++++++-------- fs/ubifs/file.c | 108 ++++++++++- fs/ubifs/ioctl.c | 40 +++++ fs/ubifs/journal.c | 224 +++++++++++++---------- fs/ubifs/key.h | 21 +-- fs/ubifs/replay.c | 10 +- fs/ubifs/sb.c | 59 ++++++ fs/ubifs/super.c | 17 +- fs/ubifs/tnc.c | 159 ++++++++++++---- fs/ubifs/ubifs-media.h | 29 ++- fs/ubifs/ubifs.h | 106 +++++++++-- fs/ubifs/xattr.c | 116 +++++++----- 16 files changed, 1202 insertions(+), 288 deletions(-) create mode 100644 fs/ubifs/crypto.c -- 2.7.3