code: func (g *GPG) Decrypt(ctx context.Context, ciphertext []byte) ([]byte, error) {
  	args := append(g.args, "--decrypt")
  	cmd := exec.CommandContext(ctx, g.binary, args...)
  	cmd.Stdin = bytes.NewReader(ciphertext)
  	cmd.Stderr = os.Stderr
  
  	out.Debug(ctx, "gpg.Decrypt: %s %+v", cmd.Path, cmd.Args)
  	return cmd.Output()
  }
docs: // Decrypt will try to decrypt the given file