mirror of
https://github.com/yuzu-emu/mbedtls
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90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
/*
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* Elliptic curve Diffie-Hellman
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*
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* Copyright (C) 2006-2013, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* References:
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*
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* SEC1 http://www.secg.org/index.php?action=secg,docs_secg
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*/
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#include "polarssl/config.h"
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#if defined(POLARSSL_ECP_C)
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#include "polarssl/ecdh.h"
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/*
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* Generate public key: simple wrapper around ecp_gen_keypair
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*/
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int ecdh_gen_public( const ecp_group *grp, mpi *d, ecp_point *Q,
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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng )
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{
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return ecp_gen_keypair( grp, d, Q, f_rng, p_rng );
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}
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/*
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* Compute shared secret (SEC1 3.3.1)
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*/
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int ecdh_compute_shared( const ecp_group *grp, mpi *z,
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const ecp_point *Q, const mpi *d )
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{
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int ret;
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ecp_point P;
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ecp_point_init( &P );
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/*
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* Make sure Q is a valid pubkey before using it
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*/
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MPI_CHK( ecp_check_pubkey( grp, Q ) );
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MPI_CHK( ecp_mul( grp, &P, d, Q ) );
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if( ecp_is_zero( &P ) )
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return( POLARSSL_ERR_ECP_BAD_INPUT_DATA );
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MPI_CHK( mpi_copy( z, &P.X ) );
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cleanup:
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ecp_point_free( &P );
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return( ret );
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}
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#if defined(POLARSSL_SELF_TEST)
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/*
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* Checkup routine
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*/
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int ecdh_self_test( int verbose )
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{
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return( verbose++ );
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}
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#endif
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#endif /* defined(POLARSSL_ECP_C) */
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