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https://github.com/ipxe/ipxe
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df7ec31766
Split out the portion of tls_send_client_key_exchange_ecdhe() that actually performs the elliptic curve key exchange into a separate function ecdhe_key(). Signed-off-by: Michael Brown <mcb30@ipxe.org>
67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
/*
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* Copyright (C) 2025 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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/** @file
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*
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* Elliptic Curve Ephemeral Diffie-Hellman (ECDHE) key exchange
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*
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*/
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#include <string.h>
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#include <ipxe/ecdhe.h>
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/**
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* Calculate ECDHE key
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*
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* @v curve Elliptic curve
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* @v partner Partner public curve point
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* @v private Private key
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* @v public Public curve point to fill in (may overlap partner key)
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* @v shared Shared secret curve point to fill in
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* @ret rc Return status code
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*/
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int ecdhe_key ( struct elliptic_curve *curve, const void *partner,
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const void *private, void *public, void *shared ) {
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int rc;
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/* Construct shared key */
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if ( ( rc = elliptic_multiply ( curve, partner, private,
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shared ) ) != 0 ) {
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DBGC ( curve, "CURVE %s could not generate shared key: %s\n",
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curve->name, strerror ( rc ) );
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return rc;
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}
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/* Construct public key */
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if ( ( rc = elliptic_multiply ( curve, NULL, private,
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public ) ) != 0 ) {
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DBGC ( curve, "CURVE %s could not generate public key: %s\n",
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curve->name, strerror ( rc ) );
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return rc;
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}
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return 0;
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}
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