tree 2660ee0cb76ea5831cf45c234b0a3640dbcd273e
parent b5ba28cbead8172bf18273c313dd0b8ce241f1aa
author Janos Follath <janos.follath@arm.com> 1489145501 +0000
committer Janos Follath <janos.follath@arm.com> 1489145501 +0000

Clarify the use of ECDSA API

In the ecdsa.c sample application we don't use hashing, we use ecdsa
directly on a buffer containing plain text. Although the text explains
that it should be the message hash it still can be confusing.

Any misunderstandings here are potentially very dangerous, because ECDSA
truncates the message hash if necessary and this can lead to trivial
signature forgeries if the API is misused and the message is passed
directly to the function without hashing.

This commit adds a hash computation step to the ecdsa.c sample
application and clarification to the doxygen documentation of the
ECDSA functions involved.