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/*
* Copyright (C) 2005-2006 Martin Willi
* Copyright (C) 2005 Jan Hutter
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* $Id: prf_plus.h 3589 2008-03-13 14:14:44Z martin $
*/
/**
* @defgroup prf_plus prf_plus
* @{ @ingroup crypto
*/
#ifndef PRF_PLUS_H_
#define PRF_PLUS_H_
typedef struct prf_plus_t prf_plus_t;
#include <crypto/prfs/prf.h>
/**
* Implementation of the prf+ function described in IKEv2 RFC.
*
* This class implements the prf+ algorithm. Internally it uses a pseudo random
* function, which implements the prf_t interface.
* See IKEv2 RFC 2.13.
*/
struct prf_plus_t {
/**
* Get pseudo random bytes.
*
* Get the next few bytes of the prf+ output. Space
* must be allocated by the caller.
*
* @param length number of bytes to get
* @param buffer pointer where the generated bytes will be written
*/
void (*get_bytes) (prf_plus_t *this, size_t length, u_int8_t *buffer);
/**
* Allocate pseudo random bytes.
*
* Get the next few bytes of the prf+ output. This function
* will allocate the required space.
*
* @param length number of bytes to get
* @param chunk chunk which will hold generated bytes
*/
void (*allocate_bytes) (prf_plus_t *this, size_t length, chunk_t *chunk);
/**
* Destroys a prf_plus_t object.
*/
void (*destroy) (prf_plus_t *this);
};
/**
* Creates a new prf_plus_t object.
*
* Seed will be cloned. prf will
* not be cloned, must be destroyed outside after
* prf_plus_t usage.
*
* @param prf prf object to use
* @param seed input seed for prf
* @return prf_plus_t object
*/
prf_plus_t *prf_plus_create(prf_t *prf, chunk_t seed);
#endif /*PRF_PLUS_H_ @} */
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