tree be9b2ee9c9fdf1d0c1e94c9763487bfb07be4637
parent f75f912c31b52f200b54dd5ef763208db4412226
author Hanno Becker <hanno.becker@arm.com> 1550508115 +0000
committer Hanno Becker <hanno.becker@arm.com> 1550508115 +0000

Add fields for PSA-based ECDHE to handshake structure

This is the first in a series of commits adding client-side
support for PSA-based ECDHE.

Previously, the state of an ECDHE key agreement was maintained
in the field mbedtls_ssl_handshake_params::ecdh_ctx, of type
::mbedtls_ecdh_context and manipulated through the ECDH API.

The ECDH API will be superseeded by the PSA Crypto API for key
agreement, which needs the following data:
(a) A raw buffer holding the public part of the key agreement
    received from our peer.
(b) A key slot holding the private part of the key agreement.
(c) The algorithm to use.
The commit adds fields to ::mbedtls_ssl_handshake_params
representing these three inputs to PSA-based key agreement.

Specifically, it adds a field for the key slot holding the
ECDH private key, a field for the EC curve identifier, and
a buffer holding the peer's public key.

Note: Storing the peer's public key buffer is slightly
inefficient, as one could perform the ECDH computation
as soon as the peer sends its public key, either working
with in-place or using a stack-buffer to reformat the
public key before passing it to PSA. This optimization
is left for a later commit.