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/*
* PBKDF
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_PBKDF_H__
#define BOTAN_PBKDF_H__
#include <botan/symkey.h>
namespace Botan {
/**
* Base class for PBKDF (password based key derivation function)
* implementations. Converts a password into a key using a salt
* and iterated hashing to make brute force attacks harder.
*/
class BOTAN_DLL PBKDF
{
public:
/**
* @return new instance of this same algorithm
*/
virtual PBKDF* clone() const = 0;
/**
* Get the algorithm name.
* @return name of this PBKDF algorithm
*/
virtual std::string name() const = 0;
/**
* Clear this objects internal values.
*/
virtual void clear() {}
/**
* Derive a key from a passphrase with this PBKDF object. It will use
* the salt value and number of iterations configured in this object.
* @param output_len the desired length of the key to produce
* @param passphrase the password to derive the key from
* @param salt the randomly chosen salt
* @param salt_len length of salt in bytes
* @param iterations the number of iterations to use (use 10K or more)
*/
virtual OctetString derive_key(u32bit output_len,
const std::string& passphrase,
const byte salt[], u32bit salt_len,
u32bit iterations) const = 0;
PBKDF() {}
virtual ~PBKDF() {}
private:
PBKDF(const PBKDF&) {}
PBKDF& operator=(const PBKDF&) { return (*this); }
};
/**
* For compatability with 1.8
*/
typedef PBKDF S2K;
}
#endif
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