pbkdf.h

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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/algo_base.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 Algorithm
   {
   public:
 
      /**
      * @return new instance of this same algorithm
      */
      virtual PBKDF* clone() const = 0;
 
      void clear() {}
 
      /**
      * Derive a key from a passphrase
      * @param output_len the desired length of the key to produce
      * @param passphrase the password to derive the key from
      * @param salt a 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(size_t output_len,
                                     const std::string& passphrase,
                                     const byte salt[], size_t salt_len,
                                     size_t iterations) const = 0;
   };
 
/**
* For compatability with 1.8
*/
typedef PBKDF S2K;
 
}
 
#endif