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https://git.libssh.org/projects/libssh.git
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dcb65fe584
Signed-off-by: Praneeth Sarode <praneethsarode@gmail.com> Reviewed-by: Jakub Jelen <jjelen@redhat.com>
74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
/*
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* curve25519_fallback.c - Curve25519 ECDH functions for key exchange
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*
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* This file is part of the SSH Library
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*
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* Copyright (c) 2013-2023 by Aris Adamantiadis <aris@badcode.be>
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*
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* The SSH Library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, version 2.1 of the License.
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*
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* The SSH Library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with the SSH Library; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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* MA 02111-1307, USA.
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*/
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#include "config.h"
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#include "libssh/curve25519.h"
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#include "libssh/crypto.h"
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#include "libssh/priv.h"
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#include "libssh/session.h"
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#ifdef WITH_NACL
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#include "nacl/crypto_scalarmult_curve25519.h"
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#endif
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int ssh_curve25519_init(ssh_session session)
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{
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ssh_curve25519_pubkey *pubkey_loc = NULL;
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int rc;
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if (session->server) {
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pubkey_loc = &session->next_crypto->curve25519_server_pubkey;
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} else {
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pubkey_loc = &session->next_crypto->curve25519_client_pubkey;
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}
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rc = ssh_get_random(session->next_crypto->curve25519_privkey,
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CURVE25519_PRIVKEY_SIZE,
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1);
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if (rc != 1) {
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ssh_set_error(session, SSH_FATAL, "PRNG error");
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return SSH_ERROR;
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}
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crypto_scalarmult_base(*pubkey_loc,
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session->next_crypto->curve25519_privkey);
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return SSH_OK;
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}
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int curve25519_do_create_k(ssh_session session, ssh_curve25519_pubkey k)
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{
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ssh_curve25519_pubkey *peer_pubkey_loc = NULL;
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if (session->server) {
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peer_pubkey_loc = &session->next_crypto->curve25519_client_pubkey;
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} else {
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peer_pubkey_loc = &session->next_crypto->curve25519_server_pubkey;
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}
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crypto_scalarmult(k,
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session->next_crypto->curve25519_privkey,
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*peer_pubkey_loc);
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return SSH_OK;
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}
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