dhm.h File Reference

Copyright (C) 2006-2010, 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.

#include "polarssl/bignum.h"

Data Structures
struct	dhm_context

Macros
#define	POLARSSL_ERR_DHM_BAD_INPUT_DATA   0x0480
#define	POLARSSL_ERR_DHM_CALC_SECRET_FAILED   0x04D0
#define	POLARSSL_ERR_DHM_MAKE_PARAMS_FAILED   0x04A0
#define	POLARSSL_ERR_DHM_MAKE_PUBLIC_FAILED   0x04C0
#define	POLARSSL_ERR_DHM_READ_PARAMS_FAILED   0x0490
#define	POLARSSL_ERR_DHM_READ_PUBLIC_FAILED   0x04B0

Functions
int	dhm_calc_secret (dhm_context *ctx, unsigned char *output, int *olen)
	Derive and export the shared secret (G^Y)^X mod P. More...
void	dhm_free (dhm_context *ctx)
int	dhm_make_params (dhm_context *ctx, int x_size, unsigned char *output, int *olen, int(*f_rng)(void *), void *p_rng)
	Setup and write the ServerKeyExchange parameters. More...
int	dhm_make_public (dhm_context *ctx, int s_size, unsigned char *output, int olen, int(*f_rng)(void *), void *p_rng)
	Create own private value X and export G^X. More...
int	dhm_read_params (dhm_context *ctx, unsigned char **p, const unsigned char *end)
	Parse the ServerKeyExchange parameters. More...
int	dhm_read_public (dhm_context *ctx, const unsigned char *input, int ilen)
	Import the peer's public value G^Y. More...
int	dhm_self_test (int verbose)
	Checkup routine. More...

#define POLARSSL_ERR_DHM_BAD_INPUT_DATA   0x0480

#define POLARSSL_ERR_DHM_CALC_SECRET_FAILED   0x04D0

#define POLARSSL_ERR_DHM_MAKE_PARAMS_FAILED   0x04A0

#define POLARSSL_ERR_DHM_MAKE_PUBLIC_FAILED   0x04C0

#define POLARSSL_ERR_DHM_READ_PARAMS_FAILED   0x0490

#define POLARSSL_ERR_DHM_READ_PUBLIC_FAILED   0x04B0

int dhm_calc_secret	(	dhm_context *	ctx,
		unsigned char *	output,
		int *	olen
	)

Derive and export the shared secret (G^Y)^X mod P.

Parameters

ctx	DHM context
output	destination buffer
olen	number of chars written

Returns

0 if successful, or an POLARSSL_ERR_DHM_XXX error code

void dhm_free

(

dhm_context *

ctx

)

int dhm_make_params	(	dhm_context *	ctx,
		int	x_size,
		unsigned char *	output,
		int *	olen,
		int(*)(void *)	f_rng,
		void *	p_rng
	)

Setup and write the ServerKeyExchange parameters.

Parameters

ctx	DHM context
x_size	private value size in bytes
output	destination buffer
olen	number of chars written
f_rng	RNG function
p_rng	RNG parameter

Note

This function assumes that ctx->P and ctx->G have already been properly set (for example using mpi_read_string or mpi_read_binary).

Returns

0 if successful, or an POLARSSL_ERR_DHM_XXX error code

int dhm_make_public	(	dhm_context *	ctx,
		int	s_size,
		unsigned char *	output,
		int	olen,
		int(*)(void *)	f_rng,
		void *	p_rng
	)

Create own private value X and export G^X.

Parameters

ctx	DHM context
x_size	private value size in bits
output	destination buffer
olen	must be equal to ctx->P.len
f_rng	RNG function
p_rng	RNG parameter

Returns

0 if successful, or an POLARSSL_ERR_DHM_XXX error code

int dhm_read_params	(	dhm_context *	ctx,
		unsigned char **	p,
		const unsigned char *	end
	)

Parse the ServerKeyExchange parameters.

Parameters

ctx	DHM context
p	&(start of input buffer)
end	end of buffer

Returns

0 if successful, or an POLARSSL_ERR_DHM_XXX error code

int dhm_read_public	(	dhm_context *	ctx,
		const unsigned char *	input,
		int	ilen
	)

Import the peer's public value G^Y.

Parameters

ctx	DHM context
input	input buffer
ilen	size of buffer

Returns

0 if successful, or an POLARSSL_ERR_DHM_XXX error code

int dhm_self_test

(

int

verbose

)

Checkup routine.

Returns

0 if successful, or 1 if the test failed