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/*************************************************
* S2K Header File *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#ifndef BOTAN_S2K_H__
#define BOTAN_S2K_H__
#include <botan/symkey.h>
#include <botan/rng.h>
namespace Botan {
/*************************************************
* S2K Interface *
*************************************************/
class BOTAN_DLL S2K
{
public:
/**
* Create a copy of this object.
* @return an auto_ptr to a copy of this object
*/
virtual S2K* clone() const = 0;
/**
* Get the algorithm name.
* @return the name of this S2K algorithm
*/
virtual std::string name() const = 0;
/**
* Clear this objects internal values.
*/
virtual void clear() {}
/**
* Derive a key from a passphrase with this S2K object. It will use
* the salt value and number of iterations configured in this object.
* @param key_len the desired length of the key to produce
* @param passphrase the password to derive the key from
*/
OctetString derive_key(u32bit key_len,
const std::string& passphrase) const;
/**
* Set the number of iterations for the one-way function during
* key generation.
* @param n the desired number of iterations
*/
void set_iterations(u32bit n);
/**
* Set a new salt value.
* @param new_salt a byte array defining the new salt value
* @param len the length of the above byte array
*/
void change_salt(const byte new_salt[], u32bit len);
/**
* Set a new salt value.
* @param new_salt the new salt value
*/
void change_salt(const MemoryRegion<byte>& new_salt);
/**
* Create a new random salt value using the rng
* @param rng the random number generator to use
* @param len the desired length of the new salt value
*/
void new_random_salt(RandomNumberGenerator& rng, u32bit len);
/**
* Get the number of iterations for the key derivation currently
* configured in this S2K object.
* @return the current number of iterations
*/
u32bit iterations() const { return iter; }
/**
* Get the currently configured salt value of this S2K object.
* @return the current salt value
*/
SecureVector<byte> current_salt() const { return salt; }
S2K() { iter = 0; }
virtual ~S2K() {}
private:
S2K(const S2K&) {}
S2K& operator=(const S2K&) { return (*this); }
virtual OctetString derive(u32bit, const std::string&,
const byte[], u32bit, u32bit) const = 0;
SecureVector<byte> salt;
u32bit iter;
};
}
#endif
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