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/**
* @file fips_prf.h
*
* @brief Interface of fips_prf_t.
*
*/
/*
* Copyright (C) 2006 Martin Willi
* 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.
*/
#ifndef FIPS_PRF_H_
#define FIPS_PRF_H_
typedef struct fips_prf_t fips_prf_t;
#include <library.h>
#include <crypto/prfs/prf.h>
#include <crypto/hashers/hasher.h>
/**
* @brief Implementation of prf_t using the FIPS 186-2-change1 standard.
*
* FIPS defines a "General Purpose Random Number Generator" (Revised
* Algorithm for Computing m values of x (Appendix 3.1 of FIPS 186-2)). This
* implementation is not intended for private key generation and therefore does
* not include the "mod q" operation (see FIPS 186-2-change1 p74).
* The FIPS PRF is stateful; the key changes every time when bytes are acquired.
*
* @b Constructors:
* - fips_prf_create()
* - prf_create() using one of the FIPS algorithms
*
* @ingroup prfs
*/
struct fips_prf_t {
/**
* Generic prf_t interface for this fips_prf_t class.
*/
prf_t prf_interface;
};
/**
* @brief Creates a new fips_prf_t object.
*
* FIPS 186-2 defines G() functions used in the PRF function. It can
* be implemented either based on SHA1 or DES.
*
* @param b size of b (in bytes, not bits)
* @param g G() function to use (e.g. g_sha1)
* @return
* - fips_prf_t object
* - NULL if b invalid not supported
*
* @ingroup prfs
*/
fips_prf_t *fips_prf_create(size_t b, void(*g)(u_int8_t[],chunk_t,u_int8_t[]));
/**
* @brief Implementation of the G() function based on SHA1.
*
* @param t initialization vector for SHA1 hasher, 20 bytes long
* @param c value to hash, not longer than 512 bit
* @param res result of G(), requries 20 bytes
*/
void g_sha1(u_int8_t t[], chunk_t c, u_int8_t res[]);
#endif /* FIPS_PRF_H_ */
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