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/*
* KDF/MGF
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_KDF_BASE_H__
#define BOTAN_KDF_BASE_H__
#include <botan/algo_base.h>
#include <botan/secmem.h>
#include <botan/types.h>
namespace Botan {
/**
* Key Derivation Function
*/
class BOTAN_DLL KDF : public Algorithm
{
public:
/**
* Derive a key
* @param key_len the desired output length in bytes
* @param secret the secret input
* @param salt a diversifier
*/
secure_vector<byte> derive_key(size_t key_len,
const secure_vector<byte>& secret,
const std::string& salt = "") const;
/**
* Derive a key
* @param key_len the desired output length in bytes
* @param secret the secret input
* @param salt a diversifier
*/
template<typename Alloc, typename Alloc2>
secure_vector<byte> derive_key(size_t key_len,
const std::vector<byte, Alloc>& secret,
const std::vector<byte, Alloc2>& salt) const
{
return derive_key(key_len, &secret[0], secret.size(),
&salt[0], salt.size());
}
/**
* Derive a key
* @param key_len the desired output length in bytes
* @param secret the secret input
* @param salt a diversifier
* @param salt_len size of salt in bytes
*/
secure_vector<byte> derive_key(size_t key_len,
const secure_vector<byte>& secret,
const byte salt[],
size_t salt_len) const;
/**
* Derive a key
* @param key_len the desired output length in bytes
* @param secret the secret input
* @param secret_len size of secret in bytes
* @param salt a diversifier
*/
secure_vector<byte> derive_key(size_t key_len,
const byte secret[],
size_t secret_len,
const std::string& salt = "") const;
/**
* Derive a key
* @param key_len the desired output length in bytes
* @param secret the secret input
* @param secret_len size of secret in bytes
* @param salt a diversifier
* @param salt_len size of salt in bytes
*/
secure_vector<byte> derive_key(size_t key_len,
const byte secret[],
size_t secret_len,
const byte salt[],
size_t salt_len) const;
void clear() {}
virtual KDF* clone() const = 0;
private:
virtual secure_vector<byte>
derive(size_t key_len,
const byte secret[], size_t secret_len,
const byte salt[], size_t salt_len) const = 0;
};
/**
* Mask Generation Function
*/
class BOTAN_DLL MGF
{
public:
virtual void mask(const byte in[], size_t in_len,
byte out[], size_t out_len) const = 0;
virtual ~MGF() {}
};
}
#endif
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