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| author | Sascha Hauer <s.hauer@pengutronix.de> | 2018-09-07 14:36:33 +0200 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2018-10-23 13:48:37 +0200 |
| commit | a384b47e4954a0f834749fcbe1c096c40ff5eb35 (patch) | |
| tree | 512ccd678b77a62ad99a674e309204437fa5bf04 /fs/ubifs/ubifs.h | |
| parent | 49525e5eecca5e1b4a83ac217868e8d8b843539f (diff) | |
| download | linux-0-day-a384b47e4954a0f834749fcbe1c096c40ff5eb35.tar.gz linux-0-day-a384b47e4954a0f834749fcbe1c096c40ff5eb35.tar.xz | |
ubifs: Create functions to embed a HMAC in a node
With authentication support some nodes (master node, super block node)
get a HMAC embedded into them. This patch adds functions to prepare and
write such a node.
The difficulty is that besides the HMAC the nodes also have a CRC which
must stay valid. This means we first have to initialize all fields in
the node, then calculate the HMAC (not covering the CRC) and finally
calculate the CRC.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'fs/ubifs/ubifs.h')
| -rw-r--r-- | fs/ubifs/ubifs.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h index 3300f68c40978..42e904b060f9b 100644 --- a/fs/ubifs/ubifs.h +++ b/fs/ubifs/ubifs.h @@ -1710,11 +1710,15 @@ int ubifs_read_node_wbuf(struct ubifs_wbuf *wbuf, void *buf, int type, int len, int lnum, int offs); int ubifs_write_node(struct ubifs_info *c, void *node, int len, int lnum, int offs); +int ubifs_write_node_hmac(struct ubifs_info *c, void *buf, int len, int lnum, + int offs, int hmac_offs); int ubifs_check_node(const struct ubifs_info *c, const void *buf, int lnum, int offs, int quiet, int must_chk_crc); void ubifs_init_node(struct ubifs_info *c, void *buf, int len, int pad); void ubifs_crc_node(struct ubifs_info *c, void *buf, int len); void ubifs_prepare_node(struct ubifs_info *c, void *buf, int len, int pad); +int ubifs_prepare_node_hmac(struct ubifs_info *c, void *node, int len, + int hmac_offs, int pad); void ubifs_prep_grp_node(struct ubifs_info *c, void *node, int len, int last); int ubifs_io_init(struct ubifs_info *c); void ubifs_pad(const struct ubifs_info *c, void *buf, int pad); |