[openssl-users] X25519 not listed in ecparam -list_curves

Dr. Stephen Henson steve at openssl.org
Mon Nov 14 21:05:06 UTC 2016

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.

Dr Stephen N. Henson. OpenSSL project core developer.
Commercial tech support now available see: http://www.openssl.org

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