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diff --git a/src/algo_base/algo_base.h b/src/algo_base/algo_base.h
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+/*
+* Symmetric Algorithm Base Class
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_ALGO_BASE_CLASS_H__
+#define BOTAN_ALGO_BASE_CLASS_H__
+
+#include <botan/build.h>
+#include <string>
+
+namespace Botan {
+
+/**
+* This class represents a symmetric algorithm object.
+*/
+class BOTAN_DLL Algorithm
+ {
+ public:
+
+ /**
+ * Make a new object representing the same algorithm as *this
+ */
+ virtual Algorithm* clone() const = 0;
+
+ /**
+ * Zeroize internal state
+ */
+ virtual void clear() = 0;
+
+ /**
+ * @return name of this algorithm
+ */
+ virtual std::string name() const = 0;
+
+ virtual ~Algorithm() {}
+ };
+
+}
+
+#endif