hmac.h

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/*
* HMAC
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
 
#ifndef BOTAN_HMAC_H__
#define BOTAN_HMAC_H__
 
#include <botan/mac.h>
#include <botan/hash.h>
 
namespace Botan {
 
/**
* HMAC
*/
class BOTAN_DLL HMAC : public MessageAuthenticationCode
   {
   public:
      void clear();
      std::string name() const;
      MessageAuthenticationCode* clone() const;
 
      size_t output_length() const { return hash->output_length(); }
 
      Key_Length_Specification key_spec() const
         {
         // Absurd max length here is to support PBKDF2
         return Key_Length_Specification(0, 512);
         }
 
      /**
      * @param hash the hash to use for HMACing
      */
      HMAC(HashFunction* hash);
      ~HMAC() { delete hash; }
   private:
      void add_data(const byte[], size_t);
      void final_result(byte[]);
      void key_schedule(const byte[], size_t);
 
      HashFunction* hash;
      SecureVector<byte> i_key, o_key;
   };
 
}
 
#endif