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// SPDX-License-Identifier: GPL-2.0-or-later
#ifndef FQTERM_SSH2_KEX_H
#define FQTERM_SSH2_KEX_H
#include <openssl/sha.h>
#include "fqterm_ssh_kex.h"
#include "ssh_session.h"
namespace FQTerm {
class FQTermSSHPacketReceiver;
class FQTermSSHPacketSender;
class FQTermSSH2Kex: public FQTermSSHKex {
Q_OBJECT;
private:
enum FQTermSSH2KexState {
BEFORE_KEXINIT, WAIT_REPLY, SESSIONKEY_SENT, KEYEX_OK
} kex_state_;
/*
string V_C, the client's identification string (CR and LF
excluded)
string V_S, the server's identification string (CR and LF
excluded)
string I_C, the payload of the client's SSH_MSG_KEXINIT
string I_S, the payload of the server's SSH_MSG_KEXINIT
string K_S, the host key
mpint e, exchange value sent by the client
mpint f, exchange value sent by the server
mpint K, the shared secret
*/
ssh_session sess;
bool is_first_kex_;
u_char cookie_[16];
int server_flag_, ciphers_, auth_;
// u_char session_id_[16];
u_char session_key_[32];
bool negotiateAlgorithms();
void exchangeKey();
bool verifyKey();
void sendNewKeys();
bool changeKeyAlg();
public:
FQTermSSH2Kex(const char *V_C, const char *V_S);
~FQTermSSH2Kex();
virtual void initKex(FQTermSSHPacketReceiver *packetReceiver,
FQTermSSHPacketSender *outputSender);
void hostKeyHash(unsigned char *md)
{
SHA256(sess.K_S, sess.K_S_len, md);
}
const unsigned char *K_S() { return sess.K_S; }
int K_S_len() { return sess.K_S_len; }
public slots:
void handlePacket(int type);
};
} // namespace FQTerm
#endif //FQTERM_SSH2_KEX_H
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