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diff --git a/src/lib/dns/rdata/generic/tkey_249.h b/src/lib/dns/rdata/generic/tkey_249.h
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+// Copyright (C) 2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// BEGIN_HEADER_GUARD
+
+#include <stdint.h>
+
+#include <string>
+
+#include <dns/name.h>
+#include <dns/rdata.h>
+
+// BEGIN_ISC_NAMESPACE
+
+// BEGIN_COMMON_DECLARATIONS
+// END_COMMON_DECLARATIONS
+
+// BEGIN_RDATA_NAMESPACE
+
+struct TKEYImpl;
+
+/// \brief \c rdata::TKEY class represents the TKEY RDATA as defined %in
+/// RFC2930.
+///
+/// This class implements the basic interfaces inherited from the abstract
+/// \c rdata::Rdata class, and provides trivial accessors specific to the
+/// TKEY RDATA.
+class TKEY : public Rdata {
+public:
+    // BEGIN_COMMON_MEMBERS
+    // END_COMMON_MEMBERS
+
+    /// \brief Constructor from RDATA field parameters.
+    ///
+    /// The parameters are a straightforward mapping of %TKEY RDATA
+    /// fields as defined %in RFC2930.
+    ///
+    /// This RR is pretty close to the TSIG RR with 32 bit timestamps,
+    /// or the RRSIG RR with a second "other" data field.
+    ///
+    /// This constructor internally involves resource allocation, and if
+    /// it fails, a corresponding standard exception will be thrown.
+    ///
+    /// \param algorithm The DNS name of the algorithm e.g. gss-tsig.
+    /// \param inception The inception time (in seconds since 1970).
+    /// \param expire The expire time (in seconds since 1970).
+    /// \param mode The mode e.g. Diffie-Hellman (2) or GSS-API (3).
+    /// \param error The error code (extended error space shared with TSIG).
+    /// \param key_len The key length (0 means no key).
+    /// \param key The key (can be 0).
+    /// \param other_len The other data length (0 means no other data).
+    /// \param other_data The other data (can be and usually is 0).
+    TKEY(const Name& algorithm, uint32_t inception, uint32_t expire,
+         uint16_t mode, uint16_t error, uint16_t key_len,
+         const void* key, uint16_t other_len, const void* other_data);
+
+    /// \brief Assignment operator.
+    ///
+    /// It internally allocates a resource, and if it fails a corresponding
+    /// standard exception will be thrown.
+    /// This operator never throws an exception otherwise.
+    ///
+    /// This operator provides the strong exception guarantee: When an
+    /// exception is thrown the content of the assignment target will be
+    /// intact.
+    TKEY& operator=(const TKEY& source);
+
+    /// \brief The destructor.
+    ~TKEY();
+
+    /// \brief Return the algorithm name.
+    ///
+    /// This method never throws an exception.
+    const Name& getAlgorithm() const;
+
+    /// \brief Return the value of the Inception field as a number.
+    ///
+    /// This method never throws an exception.
+    uint32_t getInception() const;
+
+    /// \brief Return the value of the Inception field as a string.
+    std::string getInceptionDate() const;
+
+    /// \brief Return the value of the Expire field as a number.
+    ///
+    /// This method never throws an exception.
+    uint32_t getExpire() const;
+
+    /// \brief Return the value of the Expire field as a string.
+    std::string getExpireDate() const;
+
+    /// \brief Return the value of the Mode field.
+    ///
+    /// This method never throws an exception.
+    uint16_t getMode() const;
+
+    /// \brief Return the value of the Error field.
+    ///
+    /// This method never throws an exception.
+    uint16_t getError() const;
+
+    /// \brief Return the value of the Key Len field.
+    ///
+    /// This method never throws an exception.
+    uint16_t getKeyLen() const;
+
+    /// \brief Return the value of the Key field.
+    ///
+    /// This method never throws an exception.
+    const void* getKey() const;
+
+    /// \brief Return the value of the Other Len field.
+    ///
+    /// This method never throws an exception.
+    uint16_t getOtherLen() const;
+
+    /// \brief Return the value of the Other Data field.
+    ///
+    /// The same note as \c getMAC() applies.
+    ///
+    /// This method never throws an exception.
+    const void* getOtherData() const;
+
+    /// \brief The GSS_API constant for the Mode field.
+    static const uint16_t GSS_API_MODE;
+
+private:
+    TKEYImpl* constructFromLexer(MasterLexer& lexer, const Name* origin);
+
+    TKEYImpl* impl_;
+};
+
+// END_RDATA_NAMESPACE
+// END_ISC_NAMESPACE
+// END_HEADER_GUARD
+
+// Local Variables:
+// mode: c++
+// End: