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diff --git a/lib/iov.h b/lib/iov.h
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+/*
+ * Copyright (C) 2019 Red Hat, Inc.
+ *
+ * Author: Daiki Ueno
+ *
+ * This file is part of GnuTLS.
+ *
+ * The GnuTLS is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>
+ *
+ */
+
+#ifndef GNUTLS_LIB_IOV_H
+#define GNUTLS_LIB_IOV_H
+
+#include "gnutls_int.h"
+
+struct iov_iter_st {
+	const giovec_t *iov;
+	size_t iov_count;	/* the number of iov */
+	size_t iov_index;	/* index of the current buffer */
+	size_t iov_offset;	/* byte offset in the current buffer */
+
+	uint8_t block[MAX_CIPHER_BLOCK_SIZE]; /* incomplete block for reading */
+	size_t block_size;	/* actual block size of the cipher */
+	size_t block_offset;	/* offset in block */
+};
+
+int _gnutls_iov_iter_init(struct iov_iter_st *iter,
+			  const giovec_t *iov, size_t iov_count,
+			  size_t block_size);
+
+ssize_t _gnutls_iov_iter_next(struct iov_iter_st *iter, uint8_t **data);
+
+int _gnutls_iov_iter_sync(struct iov_iter_st *iter, const uint8_t *data,
+			  size_t data_size);
+
+#endif /* GNUTLS_LIB_IOV_H */