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/*************************************************
* Base Classes Header File *
* (C) 1999-2007 The Botan Project *
*************************************************/
#ifndef BOTAN_BASE_H__
#define BOTAN_BASE_H__
#include <botan/exceptn.h>
#include <botan/symkey.h>
namespace Botan {
/*************************************************
* Constants *
*************************************************/
static const u32bit DEFAULT_BUFFERSIZE = BOTAN_DEFAULT_BUFFER_SIZE;
/*************************************************
* Symmetric Algorithm *
*************************************************/
class SymmetricAlgorithm
{
public:
const u32bit MAXIMUM_KEYLENGTH, MINIMUM_KEYLENGTH, KEYLENGTH_MULTIPLE;
virtual std::string name() const = 0;
void set_key(const SymmetricKey&) throw(Invalid_Key_Length);
void set_key(const byte[], u32bit) throw(Invalid_Key_Length);
bool valid_keylength(u32bit) const;
SymmetricAlgorithm(u32bit, u32bit, u32bit);
virtual ~SymmetricAlgorithm() {}
private:
virtual void key(const byte[], u32bit) = 0;
};
/*************************************************
* Block Cipher *
*************************************************/
class BlockCipher : public SymmetricAlgorithm
{
public:
const u32bit BLOCK_SIZE;
void encrypt(const byte in[], byte out[]) const { enc(in, out); }
void decrypt(const byte in[], byte out[]) const { dec(in, out); }
void encrypt(byte block[]) const { enc(block, block); }
void decrypt(byte block[]) const { dec(block, block); }
virtual BlockCipher* clone() const = 0;
virtual void clear() throw() {};
BlockCipher(u32bit, u32bit, u32bit = 0, u32bit = 1);
virtual ~BlockCipher() {}
private:
virtual void enc(const byte[], byte[]) const = 0;
virtual void dec(const byte[], byte[]) const = 0;
};
/*************************************************
* Stream Cipher *
*************************************************/
class StreamCipher : public SymmetricAlgorithm
{
public:
const u32bit IV_LENGTH;
void encrypt(const byte i[], byte o[], u32bit len) { cipher(i, o, len); }
void decrypt(const byte i[], byte o[], u32bit len) { cipher(i, o, len); }
void encrypt(byte in[], u32bit len) { cipher(in, in, len); }
void decrypt(byte in[], u32bit len) { cipher(in, in, len); }
virtual void resync(const byte[], u32bit);
virtual void seek(u32bit);
virtual StreamCipher* clone() const = 0;
virtual void clear() throw() {};
StreamCipher(u32bit, u32bit = 0, u32bit = 1, u32bit = 0);
virtual ~StreamCipher() {}
private:
virtual void cipher(const byte[], byte[], u32bit) = 0;
};
/*************************************************
* Buffered Computation *
*************************************************/
class BufferedComputation
{
public:
const u32bit OUTPUT_LENGTH;
void update(const byte[], u32bit);
void update(const MemoryRegion<byte>&);
void update(const std::string&);
void update(byte);
void final(byte out[]) { final_result(out); }
SecureVector<byte> final();
SecureVector<byte> process(const byte[], u32bit);
SecureVector<byte> process(const MemoryRegion<byte>&);
SecureVector<byte> process(const std::string&);
BufferedComputation(u32bit);
virtual ~BufferedComputation() {}
private:
virtual void add_data(const byte[], u32bit) = 0;
virtual void final_result(byte[]) = 0;
};
/*************************************************
* Hash Function *
*************************************************/
class HashFunction : public BufferedComputation
{
public:
const u32bit HASH_BLOCK_SIZE;
virtual HashFunction* clone() const = 0;
virtual std::string name() const = 0;
virtual void clear() throw() {};
HashFunction(u32bit, u32bit = 0);
virtual ~HashFunction() {}
};
/*************************************************
* Message Authentication Code *
*************************************************/
class MessageAuthenticationCode : public BufferedComputation,
public SymmetricAlgorithm
{
public:
virtual bool verify_mac(const byte[], u32bit);
virtual MessageAuthenticationCode* clone() const = 0;
virtual std::string name() const = 0;
virtual void clear() throw() {};
MessageAuthenticationCode(u32bit, u32bit, u32bit = 0, u32bit = 1);
virtual ~MessageAuthenticationCode() {}
};
/*************************************************
* Entropy Source *
*************************************************/
class EntropySource
{
public:
virtual u32bit slow_poll(byte[], u32bit) = 0;
virtual u32bit fast_poll(byte[], u32bit);
virtual ~EntropySource() {}
};
/*************************************************
* Random Number Generator *
*************************************************/
class RandomNumberGenerator
{
public:
virtual void randomize(byte[], u32bit) throw(PRNG_Unseeded) = 0;
virtual bool is_seeded() const { return true; }
virtual void clear() throw() {};
void add_entropy(const byte[], u32bit);
u32bit add_entropy(EntropySource&, bool = true);
virtual ~RandomNumberGenerator() {}
private:
virtual void add_randomness(const byte[], u32bit) = 0;
};
}
#endif
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