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diff --git a/SoftHSMv2/src/lib/crypto/MacAlgorithm.h b/SoftHSMv2/src/lib/crypto/MacAlgorithm.h
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+++ b/SoftHSMv2/src/lib/crypto/MacAlgorithm.h
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+/*
+ * Copyright (c) 2010 SURFnet bv
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+ * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*****************************************************************************
+ MacAlgorithm.h
+
+ Base class for MAC algorithm classes
+ *****************************************************************************/
+
+#ifndef _SOFTHSM_V2_MACALGORITHM_H
+#define _SOFTHSM_V2_MACALGORITHM_H
+
+#include <string>
+#include "config.h"
+#include "SymmetricKey.h"
+#include "RNG.h"
+
+struct MacAlgo
+{
+	enum Type
+	{
+		Unknown,
+		HMAC_MD5,
+		HMAC_SHA1,
+		HMAC_SHA224,
+		HMAC_SHA256,
+		HMAC_SHA384,
+		HMAC_SHA512,
+		HMAC_GOST,
+		CMAC_DES,
+		CMAC_AES
+	};
+};
+
+class MacAlgorithm
+{
+public:
+	// Base constructors
+	MacAlgorithm();
+
+	// Destructor
+	virtual ~MacAlgorithm() { }
+
+	// Signing functions
+	virtual bool signInit(const SymmetricKey* key);
+	virtual bool signUpdate(const ByteString& dataToSign);
+	virtual bool signFinal(ByteString& signature);
+
+	// Verification functions
+	virtual bool verifyInit(const SymmetricKey* key);
+	virtual bool verifyUpdate(const ByteString& originalData);
+	virtual bool verifyFinal(ByteString& signature);
+
+	// Key
+	virtual unsigned long getMinKeySize();
+	virtual unsigned long getMaxKeySize();
+	virtual void recycleKey(SymmetricKey* toRecycle);
+
+	// Return the MAC size
+	virtual size_t getMacSize() const = 0;
+
+protected:
+	// The current key
+	const SymmetricKey* currentKey;
+
+private:
+	// The current operation
+	enum
+	{
+		NONE,
+		SIGN,
+		VERIFY
+	} 
+	currentOperation;
+};
+
+#endif // !_SOFTHSM_V2_MACALGORITHM_H
+