On Mon, Nov 14, 2016, Blumenthal, Uri - 0553 - MITLL wrote: > As "-list-curves" is not supposed to work here, what would be a good way to tell if a given installation supports X25519? > Well only OpenSSL 1.1.0 currently supports X25519. One way is to look at the output of: openssl list -public-key-algorithms Though that command doesn't exist before OpenSSL 1.1.0. Alternatively just generate a private key with: openssl genpkey -algorithm X25519 Which will work in OpenSSL 1.1.0 but give an error in previous versions. Steve. -- Dr Stephen N. Henson. OpenSSL project core developer. Commercial tech support now available see: http://www.openssl.org -- openssl-users mailing list To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users