tree b92923d4de1c83db5b706f9b7bc86eeb7ab64d2b
parent 556d7d9e3b09157555310466a47e25a9ebfd8f4e
author Janos Follath <janos.follath@arm.com> 1540898645 +0000
committer Janos Follath <janos.follath@arm.com> 1543586997 +0000

ECP: Add mbedtls_ecp_tls_read_group_id()

`mbedtls_ecp_tls_read_group()` both parses the group ID and loads the
group into the structure provided. We want to support alternative
implementations of ECDH in the future and for that we need to parse the
group ID without populating an `mbedtls_ecp_group` structure (because
alternative implementations might not use that).

This commit moves the part that parses the group ID to a new function.
There is no need to test the new function directly, because the tests
for `mbedtls_ecp_tls_read_group()` are already implicitly testing it.

There is no intended change in behaviour in this commit.