Simplifies public key loading and this way unencrypted PKCS#8-encoded
keys can be loaded directly without pkcs8 plugin (code for encrypted
keys could probably later be added, if necessary).
It also simplifies the implementation of private_key_t::get_public_key()
a lot.
Without OID we can't generate an algorithmIdentifier when loading the
key again. And older versions of OpenSSL insist on a public key when
e.g. converting a key to PKCS#8.
Simply unwrapping the ECPrivateKey structure avoids log messages when
parsing other keys in the KEY_ANY case.
Tobias Brunner