[openssl-dev] [openssl.org #3138] 80-bit Elliptic Curves with !MEDIUM !LOW !EXP cipher list

[Emilia Käsper via RT]

Curves aren't negotiated with the ciphersuite, but rather via a separate
extension. Since OpenSSL 1.0.2, there are
SSL_CTX_set1_curves and SSL_CTX_set1_curves_list to configure supported curves:

https://www.openssl.org/docs/manmaster/ssl/SSL_CTX_set_ecdh_auto.html

OpenSSL 1.1 also has a security levels API in the works to make this sort of
configuration easier.