cr50: add extension command for testing hash primitives

A new extended subcommand code (1) is being added to handle hash
testing.

The new subcommand handler keeps track of multiple sha1 and sha256
contexts the host might want to exercise. The number of available
contexts is limited by the amount of available free memory.

One of four hash operations could be requested by the host: 'Start',
'Continue', 'Finish' - when hashing a single stream over multiple
extended command messages, and 'Single' when the entire message to be
hashed is included in one extended command payload.

The command payload had the following format:

 * field     |    size  |                  note
 * ===================================================================
 * mode      |    1     | 0 - start, 1 - cont., 2 - finish, 3 - single
 * hash_mode |    1     | 0 - sha1, 1 - sha256
 * handle    |    1     | seassion handle, ignored in 'single' mode
 * text_len  |    2     | size of the text to process, big endian
 * text      | text_len | text to hash

As soon as the first 'Start' message is encountered, the handler tries
to allocate shared memory to keep track of the test contexts, the
amount of available memory determines how many contexts the handler
can support concurrently.

As soon as the last 'Finish' command is encountered, the handler
returns the shared memory to the 'heap'.

BRANCH=none
BUG=chrome-os-partner:43025
TEST=after adding the host side implementation and fixing a couple of
     bugs, hash tests pass (see upcoming patches).

Change-Id: Iae18552d6220d670d1c6f32294f0af1a8d0d5c90
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/314692
Reviewed-by: Bill Richardson <wfrichar@chromium.org>

0 files changed, 0 insertions, 0 deletions