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diff --git a/src/libdnssec/random.h b/src/libdnssec/random.h
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+/*  Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program 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 <http://www.gnu.org/licenses/>.
+*/
+/*!
+ * \file
+ *
+ * \addtogroup random
+ *
+ * \brief Pseudo-random number generating API.
+ *
+ * The module provides generating of pseudo-random numbers and buffers.
+ *
+ * Example:
+ *
+ * ~~~
+ *
+ * uint16_t transaction_id = dnssec_random_uint16_t();
+ *
+ * ~~~
+ *
+ * @{
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <libdnssec/binary.h>
+
+/*!
+ * Fill a buffer with pseudo-random data.
+ *
+ * \param data  Pointer to the output buffer.
+ * \param size  Size of the output buffer.
+ *
+ * \return Error code, DNSEC_EOK if successful.
+ */
+int dnssec_random_buffer(uint8_t *data, size_t size);
+
+/*!
+ * Fill a binary structure with random data.
+ *
+ * \param data  Preallocated binary structure to be filled.
+ *
+ * \return Error code, DNSEC_EOK if successful.
+ */
+int dnssec_random_binary(dnssec_binary_t *data);
+
+/*!
+ * Declare function dnssec_random_<type>().
+ */
+#define dnssec_register_random_type(type) \
+	static inline type dnssec_random_##type(void) { \
+		type value; \
+		dnssec_random_buffer((uint8_t *)&value, sizeof(value)); \
+		return value; \
+	}
+
+/*!
+ * Generate pseudo-random 16-bit number.
+ */
+static inline uint16_t dnssec_random_uint16_t(void);
+
+/*!
+ * Generate pseudo-random 32-bit number.
+ */
+static inline uint32_t dnssec_random_uint32_t(void);
+
+/*! \cond */
+dnssec_register_random_type(uint16_t);
+dnssec_register_random_type(uint32_t);
+/*! \endcond */
+
+/*! @} */