// SymmetricallyEncrypt acts like gpg -c: it encrypts a file with a passphrase.
// The resulting WriteCloser must be closed after the contents of the file have
// been written.
// If config is nil, sensible defaults will be used.
func SymmetricallyEncrypt(ciphertext io.Writer, passphrase []byte, hints *FileHints, config *packet.Config) (plaintext io.WriteCloser, err error) {
	if hints == nil {
		hints = &FileHints{}
	}

	key, err := packet.SerializeSymmetricKeyEncrypted(ciphertext, passphrase, config)
	if err != nil {
		return
	}
	w, err := packet.SerializeSymmetricallyEncrypted(ciphertext, config.Cipher(), key, config)
	if err != nil {
		return
	}

	literaldata := w
	if algo := config.Compression(); algo != packet.CompressionNone {
		var compConfig *packet.CompressionConfig
		if config != nil {
			compConfig = config.CompressionConfig
		}
		literaldata, err = packet.SerializeCompressed(w, algo, compConfig)
		if err != nil {
			return
		}
	}

	var epochSeconds uint32
	if !hints.ModTime.IsZero() {
		epochSeconds = uint32(hints.ModTime.Unix())
	}
	return packet.SerializeLiteral(literaldata, hints.IsBinary, hints.FileName, epochSeconds)
}
Exemple #2
0
// SymmetricallyEncrypt acts like gpg -c: it encrypts a file with a passphrase.
// The resulting WriteCloser must be closed after the contents of the file have
// been written.
// If config is nil, sensible defaults will be used.
func SymmetricallyEncrypt(ciphertext io.Writer, passphrase []byte, hints *FileHints, config *packet.Config) (plaintext io.WriteCloser, err error) {
	if hints == nil {
		hints = &FileHints{}
	}

	key, err := packet.SerializeSymmetricKeyEncrypted(ciphertext, passphrase, config)
	if err != nil {
		return
	}
	w, err := packet.SerializeSymmetricallyEncrypted(ciphertext, config.Cipher(), key, config)
	if err != nil {
		return
	}
	var epochSeconds uint32
	if !hints.ModTime.IsZero() {
		epochSeconds = uint32(hints.ModTime.Unix())
	}
	return packet.SerializeLiteral(w, hints.IsBinary, hints.FileName, epochSeconds)
}