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diff --git a/src/lib/dns/rdata/any_255/tsig_250.h b/src/lib/dns/rdata/any_255/tsig_250.h
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+// Copyright (C) 2010-2015 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 TSIGImpl;
+
+/// \brief \c rdata::TSIG class represents the TSIG RDATA as defined %in
+/// RFC2845.
+///
+/// This class implements the basic interfaces inherited from the abstract
+/// \c rdata::Rdata class, and provides trivial accessors specific to the
+/// TSIG RDATA.
+class TSIG : public Rdata {
+public:
+    // BEGIN_COMMON_MEMBERS
+    // END_COMMON_MEMBERS
+
+    /// \brief Constructor from RDATA field parameters.
+    ///
+    /// The parameters are a straightforward mapping of %TSIG RDATA
+    /// fields as defined %in RFC2845, but there are some implementation
+    /// specific notes as follows.
+    ///
+    /// \c algorithm is a \c Name object that specifies the algorithm.
+    /// For example, if the algorithm is HMAC-SHA256, \c algorithm would be
+    /// \c Name("hmac-sha256").
+    ///
+    /// \c time_signed corresponds to the Time Signed field, which is of
+    /// 48-bit unsigned integer type, and therefore cannot exceed 2^48-1;
+    /// otherwise, an exception of type \c OutOfRange will be thrown.
+    ///
+    /// \c mac_size and \c mac correspond to the MAC Size and MAC fields,
+    /// respectively.  When the MAC field is empty, \c mac must be NULL.
+    /// \c mac_size and \c mac must be consistent %in that \c mac_size is 0 if
+    /// and only if \c mac is NULL; otherwise an exception of type
+    /// InvalidParameter will be thrown.
+    ///
+    /// The same restriction applies to \c other_len and \c other_data,
+    /// which correspond to the Other Len and Other Data fields, respectively.
+    ///
+    /// This constructor internally involves resource allocation, and if
+    /// it fails, a corresponding standard exception will be thrown.
+    TSIG(const Name& algorithm, uint64_t time_signed, uint16_t fudge,
+         uint16_t mac_size, const void* mac, uint16_t original_id,
+         uint16_t error, 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.
+    TSIG& operator=(const TSIG& source);
+
+    /// \brief The destructor.
+    ~TSIG();
+
+    /// \brief Return the algorithm name.
+    ///
+    /// This method never throws an exception.
+    const Name& getAlgorithm() const;
+
+    /// \brief Return the value of the Time Signed field.
+    ///
+    /// The returned value does not exceed 2^48-1.
+    ///
+    /// This method never throws an exception.
+    uint64_t getTimeSigned() const;
+
+    /// \brief Return the value of the Fudge field.
+    ///
+    /// This method never throws an exception.
+    uint16_t getFudge() const;
+
+    /// \brief Return the value of the MAC Size field.
+    ///
+    /// This method never throws an exception.
+    uint16_t getMACSize() const;
+
+    /// \brief Return the value of the MAC field.
+    ///
+    /// If the MAC field is empty, it returns NULL.
+    /// Otherwise, the memory region beginning at the address returned by
+    /// this method is valid up to the bytes specified by the return value
+    /// of \c getMACSize().
+    /// The memory region is only valid while the corresponding \c TSIG
+    /// object is valid.  The caller must hold the \c TSIG object while
+    /// it needs to refer to the region or it must make a local copy of the
+    /// region.
+    ///
+    /// This method never throws an exception.
+    const void* getMAC() const;
+
+    /// \brief Return the value of the Original ID field.
+    ///
+    /// This method never throws an exception.
+    uint16_t getOriginalID() 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 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;
+private:
+    TSIGImpl* constructFromLexer(MasterLexer& lexer, const Name* origin);
+
+    TSIGImpl* impl_;
+};
+
+// END_RDATA_NAMESPACE
+// END_ISC_NAMESPACE
+// END_HEADER_GUARD
+
+// Local Variables:
+// mode: c++
+// End: