func golang.org/x/crypto/openpgp.SymmetricallyEncrypt

one use

	golang.org/x/crypto/openpgp (current package)
		write.go#L109: func SymmetricallyEncrypt(ciphertext io.Writer, passphrase []byte, hints *FileHints, config *packet.Config) (plaintext io.WriteCloser, err error) {