mirror of
https://github.com/yuzu-emu/mbedtls.git
synced 2024-11-26 09:15:43 +01:00
91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
/*
|
|
* Elliptic curve Diffie-Hellman
|
|
*
|
|
* Copyright (C) 2006-2013, 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.
|
|
*/
|
|
|
|
/*
|
|
* References:
|
|
*
|
|
* SEC1 http://www.secg.org/index.php?action=secg,docs_secg
|
|
*/
|
|
|
|
#include "polarssl/config.h"
|
|
|
|
#if defined(POLARSSL_ECDH_C)
|
|
|
|
#include "polarssl/ecdh.h"
|
|
|
|
/*
|
|
* Generate public key: simple wrapper around ecp_gen_keypair
|
|
*/
|
|
int ecdh_gen_public( const ecp_group *grp, mpi *d, ecp_point *Q,
|
|
int (*f_rng)(void *, unsigned char *, size_t),
|
|
void *p_rng )
|
|
{
|
|
return ecp_gen_keypair( grp, d, Q, f_rng, p_rng );
|
|
}
|
|
|
|
/*
|
|
* Compute shared secret (SEC1 3.3.1)
|
|
*/
|
|
int ecdh_compute_shared( const ecp_group *grp, mpi *z,
|
|
const ecp_point *Q, const mpi *d )
|
|
{
|
|
int ret;
|
|
ecp_point P;
|
|
|
|
ecp_point_init( &P );
|
|
|
|
/*
|
|
* Make sure Q is a valid pubkey before using it
|
|
*/
|
|
MPI_CHK( ecp_check_pubkey( grp, Q ) );
|
|
|
|
MPI_CHK( ecp_mul( grp, &P, d, Q ) );
|
|
|
|
if( ecp_is_zero( &P ) )
|
|
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA );
|
|
|
|
MPI_CHK( mpi_copy( z, &P.X ) );
|
|
|
|
cleanup:
|
|
ecp_point_free( &P );
|
|
|
|
return( ret );
|
|
}
|
|
|
|
|
|
#if defined(POLARSSL_SELF_TEST)
|
|
|
|
/*
|
|
* Checkup routine
|
|
*/
|
|
int ecdh_self_test( int verbose )
|
|
{
|
|
return( verbose++ );
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif /* defined(POLARSSL_ECDH_C) */
|