112 lines
3.3 KiB
C
112 lines
3.3 KiB
C
/**
|
|
* \file hmac_drbg.h
|
|
*
|
|
* \brief HMAC_DRBG (NIST SP 800-90A)
|
|
*
|
|
* Copyright (C) 2014, Brainspark B.V.
|
|
*
|
|
* This file is part of PolarSSL (http://www.polarssl.org)
|
|
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
|
|
*
|
|
* All rights reserved.
|
|
*
|
|
* 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.
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
#ifndef POLARSSL_HMAC_DRBG_H
|
|
#define POLARSSL_HMAC_DRBG_H
|
|
|
|
#include "md.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/*
|
|
* Simplified HMAC_DRBG context.
|
|
* No reseed counter, no prediction resistance flag.
|
|
*/
|
|
typedef struct
|
|
{
|
|
md_context_t md_ctx;
|
|
unsigned char V[POLARSSL_MD_MAX_SIZE];
|
|
unsigned char K[POLARSSL_MD_MAX_SIZE];
|
|
} hmac_drbg_context;
|
|
|
|
/**
|
|
* \brief HMAC_DRBG initialisation
|
|
*
|
|
* \param ctx HMAC_DRBG context to be initialised
|
|
* \param md_info MD algorithm to use for HMAC_DRBG
|
|
* \param data Concatenation of entropy string and additional data
|
|
* \param data_len Length of data in bytes
|
|
*
|
|
* \todo Use entropy callback rather than buffer.
|
|
*
|
|
* \return 0 if successful, or
|
|
* POLARSSL_ERR_MD_BAD_INPUT_DATA, or
|
|
* POLARSSL_ERR_MD_ALLOC_FAILED
|
|
*/
|
|
int hmac_drbg_init( hmac_drbg_context *ctx,
|
|
const md_info_t * md_info,
|
|
const unsigned char *data, size_t data_len );
|
|
|
|
/**
|
|
* \brief HMAC_DRBG update state
|
|
*
|
|
* \param ctx HMAC_DRBG context
|
|
* \param additional Additional data to update state with, or NULL
|
|
* \param add_len Length of additional data, or 0
|
|
*
|
|
* \note Additional data is optional, pass NULL and 0 as second
|
|
* third argument if no additional data is being used.
|
|
*/
|
|
void hmac_drbg_update( hmac_drbg_context *ctx,
|
|
const unsigned char *additional, size_t add_len );
|
|
|
|
/**
|
|
* \brief HMAC_DRBG generate random
|
|
*
|
|
* Note: Automatically reseeds if reseed_counter is reached. (TODO)
|
|
*
|
|
* \param p_rng HMAC_DRBG context
|
|
* \param output Buffer to fill
|
|
* \param output_len Length of the buffer
|
|
*
|
|
* \return 0 if successful.
|
|
*/
|
|
int hmac_drbg_random( void *p_rng, unsigned char *output, size_t out_len );
|
|
|
|
/**
|
|
* \brief Free an HMAC_DRBG context
|
|
*
|
|
* \param ctx HMAC_DRBG context to free.
|
|
*/
|
|
void hmac_drbg_free( hmac_drbg_context *ctx );
|
|
|
|
|
|
#if defined(POLARSSL_SELF_TEST)
|
|
/**
|
|
* \brief Checkup routine
|
|
*
|
|
* \return 0 if successful, or 1 if the test failed
|
|
*/
|
|
int hmac_drbg_self_test( int verbose );
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* hmac_drbg.h */
|