/home/dko/Projects/mobilec/src/security/xyssl-0.9/library/dhm.c File Reference

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

Go to the source code of this file.

Defines
#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 x_size, unsigned char *output, int *olen, int(*f_rng)(void *), void *p_rng)
	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, int x_size, unsigned char *output, int olen, int(*f_rng)(void *), void *p_rng)
	Create own 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.

---

Define Documentation

#define DHM_MPI_EXPORT	(	X,
		n		)

Value:

MPI_CHK( mpi_write_binary( X, p + 2, n ) ); \
    *p++ = (unsigned char)( n >> 8 );           \
    *p++ = (unsigned char)( n      ); p += n;

Referenced by dhm_make_params().

---

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 an XYSSL_ERR_DHM_XXX error code

Definition at line 208 of file dhm.c.

References dhm_context::GY, dhm_context::K, MPI_CHK, mpi_exp_mod(), mpi_size(), mpi_write_binary(), dhm_context::P, dhm_context::RP, dhm_context::X, XYSSL_ERR_DHM_BAD_INPUT_DATA, and XYSSL_ERR_DHM_CALC_SECRET_FAILED.

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

void dhm_free

(

dhm_context *

ctx

)

Definition at line 234 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	s_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 bits
	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 XYSSL_ERR_DHM_XXX error code

Definition at line 93 of file dhm.c.

References DHM_MPI_EXPORT, dhm_context::G, dhm_context::GX, dhm_context::len, MPI_CHK, mpi_cmp_mpi(), mpi_exp_mod(), mpi_grow(), mpi_lset(), mpi_shift_r(), mpi_size(), dhm_context::P, mpi::p, dhm_context::RP, dhm_context::X, and XYSSL_ERR_DHM_MAKE_PARAMS_FAILED.

Referenced by main(), and ssl_write_server_key_exchange().

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 XYSSL_ERR_DHM_XXX error code

Definition at line 167 of file dhm.c.

References dhm_context::G, dhm_context::GX, dhm_context::len, MPI_CHK, mpi_cmp_mpi(), mpi_exp_mod(), mpi_grow(), mpi_lset(), mpi_shift_r(), mpi_write_binary(), dhm_context::P, mpi::p, dhm_context::RP, dhm_context::X, XYSSL_ERR_DHM_BAD_INPUT_DATA, and XYSSL_ERR_DHM_MAKE_PUBLIC_FAILED.

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 37 of file dhm.c.

References mpi_read_binary(), XYSSL_ERR_DHM_BAD_INPUT_DATA, and XYSSL_ERR_DHM_READ_PARAMS_FAILED.

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 an XYSSL_ERR_DHM_XXX error code

Definition at line 63 of file dhm.c.

References dhm_read_bignum(), dhm_context::G, dhm_context::GY, dhm_context::len, mpi_size(), dhm_context::P, and XYSSL_ERR_DHM_BAD_INPUT_DATA.

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 an XYSSL_ERR_DHM_XXX error code

Definition at line 150 of file dhm.c.

References dhm_context::GY, dhm_context::len, mpi_read_binary(), XYSSL_ERR_DHM_BAD_INPUT_DATA, and XYSSL_ERR_DHM_READ_PUBLIC_FAILED.

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.