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/*
* PBKDF
* (C) 1999-2007,2012 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_PBKDF_H__
#define BOTAN_PBKDF_H__
#include <botan/symkey.h>
#include <chrono>
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:
virtual ~PBKDF() {}
/**
* @return new instance of this same algorithm
*/
virtual PBKDF* clone() const = 0;
virtual std::string name() const = 0;
/**
* 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)
*/
OctetString derive_key(size_t output_len,
const std::string& passphrase,
const byte salt[], size_t salt_len,
size_t iterations) const;
/**
* 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 iterations the number of iterations to use (use 10K or more)
*/
template<typename Alloc>
OctetString derive_key(size_t output_len,
const std::string& passphrase,
const std::vector<byte, Alloc>& salt,
size_t iterations) const
{
return derive_key(output_len, passphrase, &salt[0], salt.size(), iterations);
}
/**
* 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 msec is how long to run the PBKDF
* @param iterations is set to the number of iterations used
*/
OctetString derive_key(size_t output_len,
const std::string& passphrase,
const byte salt[], size_t salt_len,
std::chrono::milliseconds msec,
size_t& iterations) const;
/**
* Derive a key from a passphrase using a certain amount of time
* @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 msec is how long to run the PBKDF
* @param iterations is set to the number of iterations used
*/
template<typename Alloc>
OctetString derive_key(size_t output_len,
const std::string& passphrase,
const std::vector<byte, Alloc>& salt,
std::chrono::milliseconds msec,
size_t& iterations) const
{
return derive_key(output_len, passphrase, &salt[0], salt.size(), msec, iterations);
}
/**
* Derive a key from a passphrase for a number of iterations
* specified by either iterations or if iterations == 0 then
* running until seconds time has elapsed.
*
* @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)
* @param msec if iterations is zero, then instead the PBKDF is
* run until msec milliseconds has passed.
* @return the number of iterations performed and the derived key
*/
virtual std::pair<size_t, OctetString>
key_derivation(size_t output_len,
const std::string& passphrase,
const byte salt[], size_t salt_len,
size_t iterations,
std::chrono::milliseconds msec) const = 0;
};
}
#endif
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