Export a key
$ffi
$key_fp
$flags
ffi
The FFI object returned by rnp_ffi_create.
key_fp
Key fingerprint.
flags
See RNP_KEY_EXPORT_* predefined constants (except RNP_KEY_EXPORT_BASE64).
RNP_KEY_EXPORT_*
RNP_KEY_EXPORT_BASE64
OpenPGP packets of exported key (binary or ASCII-armored) on success失敗した場合に false を返します.
false