dhm.c File Reference

#include "mbedtls/config.h"
#include "mbedtls/dhm.h"
#include <string.h>
#include "mbedtls/pem.h"
#include "mbedtls/asn1.h"
#include "mbedtls/platform.h"
#include "arc4_alt.h"

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Macros
#define	DHM_MPI_EXPORT(X, n)

Functions
static int	dhm_read_bignum (mbedtls_mpi *X, unsigned char **p, const unsigned char *end)
static int	dhm_check_range (const mbedtls_mpi *param, const mbedtls_mpi *P)
void	mbedtls_dhm_init (mbedtls_dhm_context *ctx)
	Initialize DHM context. More...
int	mbedtls_dhm_read_params (mbedtls_dhm_context *ctx, unsigned char **p, const unsigned char *end)
	Parse the ServerKeyExchange parameters. More...
int	mbedtls_dhm_make_params (mbedtls_dhm_context *ctx, int x_size, unsigned char *output, size_t *olen, int(*f_rng)(void *, unsigned char *, size_t), void *p_rng)
	Setup and write the ServerKeyExchange parameters. More...
int	mbedtls_dhm_read_public (mbedtls_dhm_context *ctx, const unsigned char *input, size_t ilen)
	Import the peer's public value G^Y. More...
int	mbedtls_dhm_make_public (mbedtls_dhm_context *ctx, int x_size, unsigned char *output, size_t olen, int(*f_rng)(void *, unsigned char *, size_t), void *p_rng)
	Create own private value X and export G^X. More...
static int	dhm_update_blinding (mbedtls_dhm_context *ctx, int(*f_rng)(void *, unsigned char *, size_t), void *p_rng)
int	mbedtls_dhm_calc_secret (mbedtls_dhm_context *ctx, unsigned char *output, size_t output_size, size_t *olen, int(*f_rng)(void *, unsigned char *, size_t), void *p_rng)
	Derive and export the shared secret (G^Y)^X mod P. More...
void	mbedtls_dhm_free (mbedtls_dhm_context *ctx)
	Free and clear the components of a DHM key. More...
int	mbedtls_dhm_parse_dhm (mbedtls_dhm_context *dhm, const unsigned char *dhmin, size_t dhminlen)
	Parse DHM parameters in PEM or DER format. More...
static int	load_file (const char *path, unsigned char **buf, size_t *n)
int	mbedtls_dhm_parse_dhmfile (mbedtls_dhm_context *dhm, const char *path)
	Load and parse DHM parameters. More...
int	mbedtls_dhm_self_test (int verbose)
	Checkup routine. More...

Variables
static const char	mbedtls_test_dhm_params []
static const size_t	mbedtls_test_dhm_params_len = sizeof( mbedtls_test_dhm_params )

Macro Definition Documentation

DHM_MPI_EXPORT

#define DHM_MPI_EXPORT	(		X,
			n
	)

Value:

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

Function Documentation

dhm_check_range()

static int dhm_check_range ( const mbedtls_mpi *  param, const mbedtls_mpi *  P  )

static

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dhm_read_bignum()

static int dhm_read_bignum ( mbedtls_mpi *  X, unsigned char **  p, const unsigned char *  end  )

static

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dhm_update_blinding()

static int dhm_update_blinding ( mbedtls_dhm_context *  ctx, int(*)(void *, unsigned char *, size_t)  f_rng, void *  p_rng  )

static

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load_file()

static int load_file ( const char *  path, unsigned char **  buf, size_t *  n  )

static

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mbedtls_dhm_calc_secret()

int mbedtls_dhm_calc_secret	(	mbedtls_dhm_context *	ctx,
		unsigned char *	output,
		size_t	output_size,
		size_t *	olen,
		int(*)(void *, unsigned char *, size_t)	f_rng,
		void *	p_rng
	)

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

Parameters

ctx	DHM context
output	destination buffer
output_size	size of the destination buffer
olen	on exit, holds the actual number of bytes written
f_rng	RNG function, for blinding purposes
p_rng	RNG parameter

Returns

0 if successful, or an MBEDTLS_ERR_DHM_XXX error code

Note

If non-NULL, f_rng is used to blind the input as countermeasure against timing attacks. Blinding is automatically used if and only if our secret value X is re-used and costs nothing otherwise, so it is recommended to always pass a non-NULL f_rng argument.

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mbedtls_dhm_free()

void mbedtls_dhm_free

(

mbedtls_dhm_context *

ctx

)

Free and clear the components of a DHM key.

Parameters

ctx	DHM context to free and clear

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mbedtls_dhm_init()

void mbedtls_dhm_init

(

mbedtls_dhm_context *

ctx

)

Initialize DHM context.

Parameters

ctx	DHM context to be initialized

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mbedtls_dhm_make_params()

int mbedtls_dhm_make_params	(	mbedtls_dhm_context *	ctx,
		int	x_size,
		unsigned char *	output,
		size_t *	olen,
		int(*)(void *, unsigned char *, size_t)	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 mbedtls_mpi_read_string or mbedtls_mpi_read_binary).

Returns

0 if successful, or an MBEDTLS_ERR_DHM_XXX error code

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mbedtls_dhm_make_public()

int mbedtls_dhm_make_public	(	mbedtls_dhm_context *	ctx,
		int	x_size,
		unsigned char *	output,
		size_t	olen,
		int(*)(void *, unsigned char *, size_t)	f_rng,
		void *	p_rng
	)

Create own private value X and export G^X.

Parameters

ctx	DHM context
x_size	private value size in bytes
output	destination buffer
olen	must be at least equal to the size of P, ctx->len
f_rng	RNG function
p_rng	RNG parameter

Returns

0 if successful, or an MBEDTLS_ERR_DHM_XXX error code

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mbedtls_dhm_read_params()

int mbedtls_dhm_read_params	(	mbedtls_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 MBEDTLS_ERR_DHM_XXX error code

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mbedtls_dhm_read_public()

int mbedtls_dhm_read_public	(	mbedtls_dhm_context *	ctx,
		const unsigned char *	input,
		size_t	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 MBEDTLS_ERR_DHM_XXX error code

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mbedtls_dhm_self_test()

int mbedtls_dhm_self_test

(

int

verbose

)

Checkup routine.

Returns

0 if successful, or 1 if the test failed

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Variable Documentation

mbedtls_test_dhm_params

const char mbedtls_test_dhm_params[]

static

Initial value:

=
"-----BEGIN DH PARAMETERS-----\r\n"
"MIGHAoGBAJ419DBEOgmQTzo5qXl5fQcN9TN455wkOL7052HzxxRVMyhYmwQcgJvh\r\n"
"1sa18fyfR9OiVEMYglOpkqVoGLN7qd5aQNNi5W7/C+VBdHTBJcGZJyyP5B3qcz32\r\n"
"9mLJKudlVudV0Qxk5qUJaPZ/xupz0NyoVpviuiBOI1gNi8ovSXWzAgEC\r\n"
"-----END DH PARAMETERS-----\r\n"

mbedtls_test_dhm_params_len

const size_t mbedtls_test_dhm_params_len = sizeof( mbedtls_test_dhm_params )

static