Atmel Software Framework

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
ctxDHM context
outputdestination buffer
olennumber 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
ctxDHM context
x_sizeprivate value size in bytes
outputdestination buffer
olennumber of chars written
f_rngRNG function
p_rngRNG 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
ctxDHM context
x_sizeprivate value size in bits
outputdestination buffer
olenmust be equal to ctx->P.len
f_rngRNG function
p_rngRNG 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
ctxDHM context
p&(start of input buffer)
endend 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
ctxDHM context
inputinput buffer
ilensize 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