/home/dko/projects/mobilec/trunk/src/security/xyssl-0.7/library/dhm.c File Reference

#include <string.h>
#include "xyssl/dhm.h"

Go to the source code of this file.

Defines
#define	_CRT_SECURE_NO_DEPRECATE   1
#define	DHM_MPI_EXPORT(X, n)
Functions
static int	dhm_read_bignum (mpi *X, unsigned char **p, unsigned char *end)
int	dhm_read_params (dhm_context *ctx, unsigned char **p, unsigned char *end)
	Parse the ServerKeyExchange parameters.
int	dhm_make_params (dhm_context *ctx, int(*rng_f)(void *), void *rng_d, unsigned char *output, int *olen)
	Setup and write the ServerKeyExchange parameters.
int	dhm_read_public (dhm_context *ctx, unsigned char *input, int ilen)
	Import the peer's public value (G^Y).
int	dhm_make_public (dhm_context *ctx, unsigned char *output, int olen, int(*rng_f)(void *), void *rng_d)
	Create private value X and export G^X.
int	dhm_calc_secret (dhm_context *ctx, unsigned char *output, int *olen)
	Derive and export the shared secret (G^Y)^X mod P.
void	dhm_free (dhm_context *ctx)
int	dhm_self_test (int verbose)
	Checkup routine.
Variables
static const char	_dhm_src [] = "_dhm_src"

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Define Documentation

#define _CRT_SECURE_NO_DEPRECATE   1

Definition at line 30 of file dhm.c.

#define DHM_MPI_EXPORT	(	X,
		n		)

Value:

CHK( mpi_write_binary( X, p + 2, &n ) );    \
    *p++ = ( n >> 8 ); *p++ = n; p += n;

Referenced by dhm_make_params().

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Function Documentation

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 ERR_DHM_MAKE_PUBLIC_FAILED

Definition at line 206 of file dhm.c.

References CHK, ERR_DHM_BAD_INPUT_DATA, ERR_DHM_CALC_SECRET_FAILED, dhm_context::GY, dhm_context::K, mpi_exp_mod(), mpi_msb(), mpi_write_binary(), dhm_context::P, dhm_context::RP, and dhm_context::X.

Referenced by main(), ssl_parse_client_key_exchange(), and ssl_write_client_key_exchange().

void dhm_free

(

dhm_context *

ctx

)

Definition at line 232 of file dhm.c.

References dhm_context::G, dhm_context::GX, dhm_context::GY, dhm_context::K, mpi_free(), dhm_context::P, dhm_context::RP, and dhm_context::X.

Referenced by main(), and ssl_free().

int dhm_make_params	(	dhm_context *	ctx,
		int(*)(void *)	rng_f,
		void *	rng_d,
		unsigned char *	output,
		int *	olen
	)

Setup and write the ServerKeyExchange parameters.

Parameters:

	ctx	DHM context
	rng_f	points to the RNG function
	rng_d	points to the RNG data
	output	destination buffer
	olen	number of chars written

Note:

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

Returns:

0 if successful, or an MPI error code

Definition at line 96 of file dhm.c.

References CHK, DHM_MPI_EXPORT, ERR_DHM_MAKE_PARAMS_FAILED, dhm_context::G, dhm_context::GX, dhm_context::len, mpi_cmp_mpi(), mpi_exp_mod(), mpi_grow(), mpi_msb(), mpi_shift_r(), dhm_context::P, mpi::p, dhm_context::RP, and dhm_context::X.

Referenced by main(), and ssl_write_server_key_exchange().

int dhm_make_public	(	dhm_context *	ctx,
		unsigned char *	output,
		int	olen,
		int(*)(void *)	rng_f,
		void *	rng_d
	)

Create private value X and export G^X.

Parameters:

	ctx	DHM context
	output	destination buffer
	olen	must be == ctx->P.len
	rng_f	points to the RNG function
	rng_d	points to the RNG data

Returns:

0 if successful, or ERR_DHM_MAKE_PUBLIC_FAILED

Definition at line 167 of file dhm.c.

References CHK, ERR_DHM_BAD_INPUT_DATA, ERR_DHM_MAKE_PUBLIC_FAILED, dhm_context::G, dhm_context::GX, dhm_context::len, mpi_cmp_mpi(), mpi_exp_mod(), mpi_grow(), mpi_shift_r(), mpi_write_binary(), dhm_context::P, mpi::p, dhm_context::RP, and dhm_context::X.

Referenced by main(), and ssl_write_client_key_exchange().

static int dhm_read_bignum	(	mpi *	X,
		unsigned char **	p,
		unsigned char *	end
	)			[static]

Definition at line 40 of file dhm.c.

References ERR_DHM_BAD_INPUT_DATA, ERR_DHM_READ_PARAMS_FAILED, and mpi_read_binary().

Referenced by dhm_read_params().

int dhm_read_params	(	dhm_context *	ctx,
		unsigned char **	p,
		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 ERR_DHM_READ_PARAMS_FAILED

Definition at line 66 of file dhm.c.

References dhm_read_bignum(), ERR_DHM_BAD_INPUT_DATA, dhm_context::G, dhm_context::GY, dhm_context::len, mpi_msb(), and dhm_context::P.

Referenced by main(), and ssl_parse_server_key_exchange().

int dhm_read_public	(	dhm_context *	ctx,
		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 ERR_DHM_READ_PUBLIC_FAILED

Definition at line 150 of file dhm.c.

References ERR_DHM_BAD_INPUT_DATA, ERR_DHM_READ_PUBLIC_FAILED, dhm_context::GY, dhm_context::len, and mpi_read_binary().

Referenced by main(), and ssl_parse_client_key_exchange().

int dhm_self_test

(

int

verbose

)

Checkup routine.

Returns:

0 if successful, or 1 if the test failed

Definition at line 246 of file dhm.c.

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Variable Documentation

const char _dhm_src[] = "_dhm_src" [static]

Definition at line 239 of file dhm.c.

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