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+/*
+ * 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;
+}