diff options
| author | Eric Biggers <ebiggers@google.com> | 2020-07-08 14:55:29 -0700 |
|---|---|---|
| committer | Eric Biggers <ebiggers@google.com> | 2020-07-20 17:26:32 -0700 |
| commit | e455de313ef8bd1fa05a3eb6ef1bfd96eaf38e2a (patch) | |
| tree | 00d14f000e9c848a293d8fbe0b8d6494e540c449 /fs/crypto | |
| parent | 4f74d15fe40833d4fb4f5ead7437aa73840596a5 (diff) | |
fscrypt: add comments that describe the HKDF info strings
Each HKDF context byte is associated with a specific format of the
remaining part of the application-specific info string. Add comments so
that it's easier to keep track of what these all are.
Link: https://lore.kernel.org/r/20200708215529.146890-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Diffstat (limited to 'fs/crypto')
| -rw-r--r-- | fs/crypto/fscrypt_private.h | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/fs/crypto/fscrypt_private.h b/fs/crypto/fscrypt_private.h index 5bb40d0109c8..0f154bdbc14b 100644 --- a/fs/crypto/fscrypt_private.h +++ b/fs/crypto/fscrypt_private.h @@ -312,13 +312,13 @@ int fscrypt_init_hkdf(struct fscrypt_hkdf *hkdf, const u8 *master_key, * outputs are unique and cryptographically isolated, i.e. knowledge of one * output doesn't reveal another. */ -#define HKDF_CONTEXT_KEY_IDENTIFIER 1 -#define HKDF_CONTEXT_PER_FILE_ENC_KEY 2 -#define HKDF_CONTEXT_DIRECT_KEY 3 -#define HKDF_CONTEXT_IV_INO_LBLK_64_KEY 4 -#define HKDF_CONTEXT_DIRHASH_KEY 5 -#define HKDF_CONTEXT_IV_INO_LBLK_32_KEY 6 -#define HKDF_CONTEXT_INODE_HASH_KEY 7 +#define HKDF_CONTEXT_KEY_IDENTIFIER 1 /* info=<empty> */ +#define HKDF_CONTEXT_PER_FILE_ENC_KEY 2 /* info=file_nonce */ +#define HKDF_CONTEXT_DIRECT_KEY 3 /* info=mode_num */ +#define HKDF_CONTEXT_IV_INO_LBLK_64_KEY 4 /* info=mode_num||fs_uuid */ +#define HKDF_CONTEXT_DIRHASH_KEY 5 /* info=file_nonce */ +#define HKDF_CONTEXT_IV_INO_LBLK_32_KEY 6 /* info=mode_num||fs_uuid */ +#define HKDF_CONTEXT_INODE_HASH_KEY 7 /* info=<empty> */ int fscrypt_hkdf_expand(const struct fscrypt_hkdf *hkdf, u8 context, const u8 *info, unsigned int infolen, |