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| author | Theodore Ts'o <tytso@mit.edu> | 2015-04-16 07:55:00 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2015-04-16 07:55:00 +0200 |
| commit | f348c252320b98e11176074fe04223f22bddaf0d (patch) | |
| tree | 71fe0a1c86bd14f661a7e823e3b330adfc2719e3 /fs/ext4/ext4_crypto.h | |
| parent | ext4 crypto: enable filename encryption (diff) | |
| download | linux-f348c252320b98e11176074fe04223f22bddaf0d.tar.xz linux-f348c252320b98e11176074fe04223f22bddaf0d.zip | |
ext4 crypto: add symlink encryption
Signed-off-by: Uday Savagaonkar <savagaon@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ext4_crypto.h')
| -rw-r--r-- | fs/ext4/ext4_crypto.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/ext4/ext4_crypto.h b/fs/ext4/ext4_crypto.h index f7d46e8dc9d3..c2ba35a914b6 100644 --- a/fs/ext4/ext4_crypto.h +++ b/fs/ext4/ext4_crypto.h @@ -124,4 +124,24 @@ struct ext4_fname_crypto_ctx { unsigned ctfm_key_is_ready : 1; }; +/** + * For encrypted symlinks, the ciphertext length is stored at the beginning + * of the string in little-endian format. + */ +struct ext4_encrypted_symlink_data { + __le16 len; + char encrypted_path[1]; +} __attribute__((__packed__)); + +/** + * This function is used to calculate the disk space required to + * store a filename of length l in encrypted symlink format. + */ +static inline u32 encrypted_symlink_data_len(u32 l) +{ + if (l < EXT4_CRYPTO_BLOCK_SIZE) + l = EXT4_CRYPTO_BLOCK_SIZE; + return (l + sizeof(struct ext4_encrypted_symlink_data) - 1); +} + #endif /* _EXT4_CRYPTO_H */ |