dlies.h

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/*
* DLIES
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
 
#ifndef BOTAN_DLIES_H__
#define BOTAN_DLIES_H__
 
#include <botan/pubkey.h>
#include <botan/mac.h>
#include <botan/kdf.h>
 
namespace Botan {
 
/**
* DLIES Encryption
*/
class BOTAN_DLL DLIES_Encryptor : public PK_Encryptor
   {
   public:
      DLIES_Encryptor(const PK_Key_Agreement_Key&,
                      KDF* kdf,
                      MessageAuthenticationCode* mac,
                      size_t mac_key_len = 20);
 
      ~DLIES_Encryptor();
 
      void set_other_key(const MemoryRegion<byte>&);
   private:
      SecureVector<byte> enc(const byte[], size_t,
                             RandomNumberGenerator&) const;
      size_t maximum_input_size() const;
 
      SecureVector<byte> other_key, my_key;
 
      PK_Key_Agreement ka;
      KDF* kdf;
      MessageAuthenticationCode* mac;
      size_t mac_keylen;
   };
 
/**
* DLIES Decryption
*/
class BOTAN_DLL DLIES_Decryptor : public PK_Decryptor
   {
   public:
      DLIES_Decryptor(const PK_Key_Agreement_Key&,
                      KDF* kdf,
                      MessageAuthenticationCode* mac,
                      size_t mac_key_len = 20);
 
      ~DLIES_Decryptor();
 
   private:
      SecureVector<byte> dec(const byte[], size_t) const;
 
      SecureVector<byte> my_key;
 
      PK_Key_Agreement ka;
      KDF* kdf;
      MessageAuthenticationCode* mac;
      size_t mac_keylen;
   };
 
}
 
#endif