(PECL rnp >= 0.1.1)
rnp_key_export — Export a key
$ffi
$key_fp
$flags
ffi
key_fp
flags
RNP_KEY_EXPORT_*
RNP_KEY_EXPORT_BASE64
OpenPGP packets of exported key (binary or ASCII-armored) on success 或者在失败时返回 false.
false