tree 9174c571208f7d23aff49b370568a54b04c195da
parent b55f613601a2162c336da1425e16aa0ba5ccac39
author Janos Follath <janos.follath@arm.com> 1489145501 +0000
committer Janos Follath <janos.follath@arm.com> 1496847561 +0100

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.