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diff --git a/src/ChunkChecksum.h b/src/ChunkChecksum.h
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+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2006 Tatsuhiro Tsujikawa
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+/* copyright --> */
+#ifndef _D_CHUNK_CHECKSUM_H_
+#define _D_CHUNK_CHECKSUM_H_
+
+#include "common.h"
+#include "messageDigest.h"
+
+class ChunkChecksum {
+private:
+  MessageDigestContext::DigestAlgo _algo;
+  Strings _checksums;
+  int32_t _checksumLength;
+public:
+  ChunkChecksum(const MessageDigestContext::DigestAlgo& algo,
+		const Strings& checksums,
+		int32_t checksumLength):
+    _algo(algo),
+    _checksums(checksums),
+    _checksumLength(checksumLength) {}
+
+  bool validateChunk(const string& actualChecksum,
+		     int32_t checksumIndex) const
+  {
+    if(checksumIndex < (int32_t)_checksums.size()) {
+      return actualChecksum == getChecksum(checksumIndex);
+    } else {
+      return false;
+    }
+  }
+
+  int64_t getEstimatedDataLength() const
+  {
+    return ((int64_t)_checksumLength)*_checksums.size();
+  }
+
+  int32_t countChecksum() const
+  {
+    return _checksums.size();
+  }
+
+  string getChecksum(int32_t index) const
+  {
+    if(index < (int32_t)_checksums.size()) {
+      return _checksums[index];
+    } else {
+      return "";
+    }
+  }
+
+  int32_t getChecksumLength() const
+  {
+    return _checksumLength;
+  }
+
+  MessageDigestContext::DigestAlgo getAlgo() const
+  {
+    return _algo;
+  }
+};
+
+typedef SharedHandle<ChunkChecksum> ChunkChecksumHandle;
+
+#endif // _D_CHUNK_CHECKSUM_H_