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diff --git a/src/LibsslARC4Encryptor.h b/src/LibsslARC4Encryptor.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_LIBSSL_ARC4_ENCRYPTOR_H_
+#define _D_LIBSSL_ARC4_ENCRYPTOR_H_
+
+#include "common.h"
+#include "DlAbortEx.h"
+#include "LibsslARC4Context.h"
+#include <openssl/evp.h>
+#include <openssl/err.h>
+
+namespace aria2 {
+
+class ARC4Encryptor {
+private:
+  LibsslARC4Context _ctx;
+
+  void handleError() const
+  {
+    throw new DlAbortEx("Exception in libssl routine(ARC4Encryptor class): %s",
+			ERR_error_string(ERR_get_error(), 0));
+  }
+public:
+  ARC4Encryptor() {}
+
+  ~ARC4Encryptor() {}
+
+  void init(const unsigned char* key, size_t keyLength)
+  {
+    _ctx.init(key, keyLength, 1);
+  }
+
+  void encrypt(unsigned char* out, size_t outLength,
+	       const unsigned char* in, size_t inLength)
+  {
+    int soutLength = outLength;
+    if(!EVP_CipherUpdate(_ctx.getCipherContext(), out, &soutLength, in, inLength)) {
+      handleError();
+    }
+  }
+};
+
+} // namespace aria2
+
+#endif // _D_LIBSSL_ARC4_ENCRYPTOR_H_