pub unsafe extern "C" fn PEM_write_RSAPrivateKey(
out: *mut _IO_FILE,
x: *const rsa_st,
enc: *const evp_cipher_st,
kstr: *const u8,
klen: i32,
cb: Option<unsafe extern "C" fn(_: *mut i8, _: i32, _: i32, _: *mut c_void) -> i32>,
u: *mut c_void,
) -> i32