Add no signing flag.
Add a flag to EC_METHOD for curves which do not support signing. New function EC_KEY_can_sign() returns 1 is key can be used for signing. Return an explicit error is an attempt is made to sign with no signing curves. Reviewed-by: NRich Salz <rsalz@openssl.org> Reviewed-by: NEmilia Käsper <emilia@openssl.org>
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