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diff --git a/contrib/base32hex.h b/contrib/base32hex.h
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--- /dev/null
+++ b/contrib/base32hex.h
@@ -0,0 +1,60 @@
+/*  Copyright (C) 2011-2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ *  SPDX-License-Identifier: GPL-3.0-or-later
+ */
+/*!
+ * \file
+ *
+ * \brief Base32hex implementation (RFC 4648).
+ *
+ * \note Input Base32hex string can contain a-v characters. These characters
+ *       are considered as A-V equivalent.
+ *
+ * \addtogroup contrib
+ * @{
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+/*!
+ * \brief Decodes text data using Base32hex.
+ *
+ * \note Input data needn't be terminated with '\0'.
+ *
+ * \note Input data must be continuous Base32hex string!
+ *
+ * \param in		Input text data.
+ * \param in_len	Length of input string.
+ * \param out		Output data buffer.
+ * \param out_len	Size of output buffer.
+ *
+ * \retval >=0		length of output data.
+ * \retval KNOT_E*	if error.
+ */
+int32_t base32hex_decode(const uint8_t  *in,
+                         const uint32_t in_len,
+                         uint8_t        *out,
+                         const uint32_t out_len);
+
+
+/*!
+ * \brief Encodes binary data using Base32hex.  Lower case is used!
+ *
+ * \note Output data buffer contains Base32hex text string which isn't
+ *       terminated with '\0'!
+ *
+ * \param in		Input binary data.
+ * \param in_len	Length of input data.
+ * \param out		Output data buffer.
+ * \param out_len	Size of output buffer.
+ *
+ * \retval >=0		length of output string.
+ * \retval <0		if error.
+ */
+int32_t base32hex_encode(const uint8_t  *in,
+                         const uint32_t in_len,
+                         uint8_t        *out,
+                         const uint32_t out_len);
+
+/*! @} */