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/*
* Copyright (C) 2005-2006 Martin Willi
* Copyright (C) 2005 Jan Hutter
* HSR 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.
*/
/**
* @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 used in IKEv1/IKEv2 keymat extension.
*/
struct prf_plus_t {
/**
* Get pseudo random bytes.
*
* @param length number of bytes to get
* @param buffer pointer where the generated bytes will be written
* @return TRUE if bytes generated successfully
*/
bool (*get_bytes)(prf_plus_t *this, size_t length,
uint8_t *buffer) __attribute__((warn_unused_result));
/**
* Allocate pseudo random bytes.
*
* @param length number of bytes to get
* @param chunk chunk which will hold generated bytes
* @return TRUE if bytes allocated successfully
*/
bool (*allocate_bytes)(prf_plus_t *this, size_t length,
chunk_t *chunk) __attribute__((warn_unused_result));
/**
* Destroys a prf_plus_t object.
*/
void (*destroy)(prf_plus_t *this);
};
/**
* Creates a new prf_plus_t object.
*
* @param prf prf object to use, must be destroyd after prf+.
* @param counter use an appending counter byte (for IKEv2 variant)
* @param seed input seed for prf
* @return prf_plus_t object, NULL on failure
*/
prf_plus_t *prf_plus_create(prf_t *prf, bool counter, chunk_t seed);
#endif /** PRF_PLUS_H_ @}*/
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