session - Session instance as returned by libssh2_session_init_ex
username - Pointer to user name to authenticate as.
username_len - Length of username.
publickey - Path name of the public key file. (e.g. /etc/ssh/hostkey.pub). If libssh2 is built against OpenSSL, this option can be set to NULL.
privatekey - Path name of the private key file. (e.g. /etc/ssh/hostkey)
passphrase - Passphrase to use when decoding privatekey.
Attempt public key authentication using a PEM encoded private key file stored on disk
Return 0 on success or negative on failure. It returns LIBSSH2_ERROR_EAGAIN when it would otherwise block. While LIBSSH2_ERROR_EAGAIN is a negative number, it isn't really a failure per se.
LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed.
LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket.
LIBSSH2_ERROR_PUBLICKEY_UNVERIFIED - The username/public key combination was invalid.
LIBSSH2_ERROR_AUTHENTICATION_FAILED - Authentication using the supplied public key was not accepted.
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