tree c7f588c2e74c4fd176fde6c329b3e36abf123a74
parent ee24f8cecb1bf88af6a140ce312226d6b2634836
author Hanno Becker <hanno.becker@arm.com> 1560943841 +0100
committer Hanno Becker <hanno.becker@arm.com> 1562941503 +0100

Allow hardcoding single supported elliptic curve

This commit introduces the option MBEDTLS_SSL_CONF_SINGLE_EC
which can be used to register a single supported elliptic curve
at compile time. It replaces the runtime configuration API
mbedtls_ssl_conf_curves() which allows to register a _list_
of supported elliptic curves.

In contrast to other options used to hardcode configuration options,
MBEDTLS_SSL_CONF_SINGLE_EC isn't a numeric option, but instead it's
only relevant if it's defined or not. To actually set the single
elliptic curve that should be supported, numeric options

MBEDTLS_SSL_CONF_SINGLE_EC_TLS_ID
MBEDTLS_SSL_CONF_SINGLE_EC_GRP_ID

must both be defined and provide the TLS ID and the Mbed TLS internal
ID and the chosen curve, respectively.