ecc: Finish Ed25519/ECDSA hack.
* cipher/ecc.c (ecc_generate): Fix Ed25519/ECDSA case. (ecc_verify): Implement ED25519/ECDSA uncompression.
With this change Ed25519 may be used with ECDSA while using the
Ed25519 standard compression technique.
- Signed-off-by: Werner Koch <wk@gnupg.org>