[0/2] crypto: caam - add tagged keys functionality and tk transformations for skcipher

Message

Iuliana Prodan July 12, 2020, 10:05 p.m. UTC

Tagged keys are keys that contain metadata indicating what
they are and how to handle them using the new added tag_object API.
A tag object represents the metadata (or simply a header/configuration)
and the actual data (e.g. black key) obtained from hardware.
Patch #2 adds support, for tagged keys, to skcipher algorithms by
adding new transformations, with tk prefix to distinguish
between plaintext and tagged keys.

The tk_ transformations can be used directly by their name:
struct sockaddr_alg sa = {
.salg_family = AF_ALG,
.salg_type = "skcipher", /* this selects the symmetric cipher /
.salg_name = "tk(cbc(aes))" / this is the cipher name */
};
or for dm-crypt, e.g. using dmsetup:
dmsetup -v create encrypted --table "0 $(blockdev --getsz /dev/mmcblk2p10)
crypt capi:tk(cbc(aes))-plain :32:logon:seckey 0 /dev/mmcblk2p10 0 1
sector_size:512".

tk_ transformations will know how to handle tagged keys, by loading the
proper settings for KEY command.

Iuliana Prodan (2):
  crypto: caam - add tag object functionality
  crypto: caam - support tagged keys for skcipher algorithms

 drivers/crypto/caam/Kconfig        |   9 +++
 drivers/crypto/caam/Makefile       |   1 +
 drivers/crypto/caam/caamalg.c      | 107 ++++++++++++++++++++++++++++--
 drivers/crypto/caam/caamalg_desc.c |  28 ++++++--
 drivers/crypto/caam/desc.h         |   4 +-
 drivers/crypto/caam/desc_constr.h  |   4 ++
 drivers/crypto/caam/tag_object.c   | 129 +++++++++++++++++++++++++++++++++++++
 drivers/crypto/caam/tag_object.h   |  99 ++++++++++++++++++++++++++++
 8 files changed, 372 insertions(+), 9 deletions(-)
 create mode 100644 drivers/crypto/caam/tag_object.c
 create mode 100644 drivers/crypto/caam/tag_object.h