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/*************************************************
* EAX Mode Header File *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#ifndef BOTAN_EAX_H__
#define BOTAN_EAX_H__
#include <botan/basefilt.h>
namespace Botan {
/*************************************************
* EAX Base Class *
*************************************************/
class EAX_Base : public Keyed_Filter
{
public:
void set_key(const SymmetricKey&);
void set_iv(const InitializationVector&);
void set_header(const byte[], u32bit);
std::string name() const;
bool valid_keylength(u32bit) const;
~EAX_Base() { delete cipher; delete mac; }
protected:
EAX_Base(const std::string&, u32bit);
void start_msg();
void increment_counter();
const u32bit TAG_SIZE, BLOCK_SIZE;
BlockCipher* cipher;
MessageAuthenticationCode* mac;
SecureVector<byte> nonce_mac, header_mac, state, buffer;
u32bit position;
};
/*************************************************
* EAX Encryption *
*************************************************/
class EAX_Encryption : public EAX_Base
{
public:
EAX_Encryption(const std::string&, u32bit = 0);
EAX_Encryption(const std::string&, const SymmetricKey&,
const InitializationVector&, u32bit = 0);
private:
void write(const byte[], u32bit);
void end_msg();
};
/*************************************************
* EAX Decryption *
*************************************************/
class EAX_Decryption : public EAX_Base
{
public:
EAX_Decryption(const std::string&, u32bit = 0);
EAX_Decryption(const std::string&, const SymmetricKey&,
const InitializationVector&, u32bit = 0);
private:
void write(const byte[], u32bit);
void do_write(const byte[], u32bit);
void end_msg();
SecureVector<byte> queue;
u32bit queue_start, queue_end;
};
}
#endif
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