Why were edwards curves given distinct key types, aren't they EC keys?

[Erwann Abalea]

Maybe because EVP_PKEY_EC designates an ECDSA key, that an EdDSA key is not generated the same way (particularly the public part), and that the encodings are different?

Cordialement,
Erwann Abalea

Le 15/03/2019 19:20, « openssl-users au nom de Sam Roberts » <openssl-users-bounces at openssl.org au nom de vieuxtech at gmail.com> a écrit :

    It seems like they are EC keys, with specific curve designs, and that
    also have some algorithms designed specifically for them, like EdDSA
    -- though it looks like that alg is being generalized to other curve
    types (https://tools.ietf.org/html/rfc8032#ref-EDDSA2).
    
    What about them makes it necessary to make them distinct, both from
    each other, and EVP_PKEY_EC?
    
    Thanks,
    Sam