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diff --git a/common/ksba-io-support.h b/common/ksba-io-support.h
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+/* ksba-io-support.h - Supporting functions for ksba reader and writer
+ * Copyright (C) 2017  Werner Koch
+ *
+ * This file is part of GnuPG.
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of either
+ *
+ *   - the GNU Lesser General Public License as published by the Free
+ *     Software Foundation; either version 3 of the License, or (at
+ *     your option) any later version.
+ *
+ * or
+ *
+ *   - the GNU General Public License as published by the Free
+ *     Software Foundation; either version 2 of the License, or (at
+ *     your option) any later version.
+ *
+ * or both in parallel, as here.
+ *
+ * This file is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef GNUPG_KSBA_IO_SUPPORT_H
+#define GNUPG_KSBA_IO_SUPPORT_H
+
+/* Flags used with gnupg_ksba_create_reader and
+ * gnupg_ksba_create_writer.  */
+#define GNUPG_KSBA_IO_PEM         1  /* X.509 PEM format.  */
+#define GNUPG_KSBA_IO_BASE64      2  /* Plain Base64 format.  */
+#define GNUPG_KSBA_IO_AUTODETECT  4  /* Try to autodetect the format.  */
+#define GNUPG_KSBA_IO_MULTIPEM    8  /* Allow more than one PEM chunk.  */
+
+
+/* Context object.  */
+typedef struct gnupg_ksba_io_s *gnupg_ksba_io_t;
+
+
+
+gpg_error_t gnupg_ksba_create_reader (gnupg_ksba_io_t *ctx,
+                                      unsigned int flags,
+                                      estream_t fp,
+                                      ksba_reader_t *r_reader);
+
+int gnupg_ksba_reader_eof_seen (gnupg_ksba_io_t ctx);
+void gnupg_ksba_destroy_reader (gnupg_ksba_io_t ctx);
+
+gpg_error_t gnupg_ksba_create_writer (gnupg_ksba_io_t *ctx,
+                                      unsigned int flags,
+                                      const char *pem_name,
+                                      estream_t stream,
+                                      ksba_writer_t *r_writer);
+
+gpg_error_t gnupg_ksba_finish_writer (gnupg_ksba_io_t ctx);
+void gnupg_ksba_destroy_writer (gnupg_ksba_io_t ctx);
+
+
+
+
+#endif /*GNUPG_KSBA_IO_SUPPORT_H*/