* cipher/ecc-eddsa.c (_gcry_ecc_eddsa_ensure_compact): Fix calc for
bytes.
* cipher/ecc.c (ecc_encrypt_raw): Use public key as opaque byte-string
with "/q" for both cases, since it is always fixed size with a prefix.
(compute_keygrip): Likewise.
Fix hard-coded value of 256 for Ed25519.
Handle Curve25519 differently.