diff options
Diffstat (limited to 'src/crypto/ecdhe.c')
-rw-r--r-- | src/crypto/ecdhe.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/src/crypto/ecdhe.c b/src/crypto/ecdhe.c new file mode 100644 index 000000000..5481b02eb --- /dev/null +++ b/src/crypto/ecdhe.c @@ -0,0 +1,66 @@ +/* + * Copyright (C) 2025 Michael Brown <mbrown@fensystems.co.uk>. + * + * 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 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. + * + * You can also choose to distribute this program under the terms of + * the Unmodified Binary Distribution Licence (as given in the file + * COPYING.UBDL), provided that you have satisfied its requirements. + */ + +FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); + +/** @file + * + * Elliptic Curve Ephemeral Diffie-Hellman (ECDHE) key exchange + * + */ + +#include <string.h> +#include <ipxe/ecdhe.h> + +/** + * Calculate ECDHE key + * + * @v curve Elliptic curve + * @v partner Partner public curve point + * @v private Private key + * @v public Public curve point to fill in (may overlap partner key) + * @v shared Shared secret curve point to fill in + * @ret rc Return status code + */ +int ecdhe_key ( struct elliptic_curve *curve, const void *partner, + const void *private, void *public, void *shared ) { + int rc; + + /* Construct shared key */ + if ( ( rc = elliptic_multiply ( curve, partner, private, + shared ) ) != 0 ) { + DBGC ( curve, "CURVE %s could not generate shared key: %s\n", + curve->name, strerror ( rc ) ); + return rc; + } + + /* Construct public key */ + if ( ( rc = elliptic_multiply ( curve, NULL, private, + public ) ) != 0 ) { + DBGC ( curve, "CURVE %s could not generate public key: %s\n", + curve->name, strerror ( rc ) ); + return rc; + } + + return 0; +} |