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package com.trilead.ssh2.packets;
import java.io.IOException;
import java.security.SecureRandom;
import com.trilead.ssh2.crypto.CryptoWishList;
import com.trilead.ssh2.transport.KexParameters;
/**
* PacketKexInit.
*
* @author Christian Plattner, plattner@trilead.com
* @version $Id: PacketKexInit.java,v 1.1 2007/10/15 12:49:55 cplattne Exp $
*/
public class PacketKexInit
{
byte[] payload;
KexParameters kp = new KexParameters();
public PacketKexInit(CryptoWishList cwl)
{
kp.cookie = new byte[16];
new SecureRandom().nextBytes(kp.cookie);
kp.kex_algorithms = cwl.kexAlgorithms;
kp.server_host_key_algorithms = cwl.serverHostKeyAlgorithms;
kp.encryption_algorithms_client_to_server = cwl.c2s_enc_algos;
kp.encryption_algorithms_server_to_client = cwl.s2c_enc_algos;
kp.mac_algorithms_client_to_server = cwl.c2s_mac_algos;
kp.mac_algorithms_server_to_client = cwl.s2c_mac_algos;
kp.compression_algorithms_client_to_server = cwl.c2s_comp_algos;
kp.compression_algorithms_server_to_client = cwl.s2c_comp_algos;
kp.languages_client_to_server = new String[] {};
kp.languages_server_to_client = new String[] {};
kp.first_kex_packet_follows = false;
kp.reserved_field1 = 0;
}
public PacketKexInit(byte payload[], int off, int len) throws IOException
{
this.payload = new byte[len];
System.arraycopy(payload, off, this.payload, 0, len);
TypesReader tr = new TypesReader(payload, off, len);
int packet_type = tr.readByte();
if (packet_type != Packets.SSH_MSG_KEXINIT)
throw new IOException("This is not a KexInitPacket! (" + packet_type + ")");
kp.cookie = tr.readBytes(16);
kp.kex_algorithms = tr.readNameList();
kp.server_host_key_algorithms = tr.readNameList();
kp.encryption_algorithms_client_to_server = tr.readNameList();
kp.encryption_algorithms_server_to_client = tr.readNameList();
kp.mac_algorithms_client_to_server = tr.readNameList();
kp.mac_algorithms_server_to_client = tr.readNameList();
kp.compression_algorithms_client_to_server = tr.readNameList();
kp.compression_algorithms_server_to_client = tr.readNameList();
kp.languages_client_to_server = tr.readNameList();
kp.languages_server_to_client = tr.readNameList();
kp.first_kex_packet_follows = tr.readBoolean();
kp.reserved_field1 = tr.readUINT32();
if (tr.remain() != 0)
throw new IOException("Padding in KexInitPacket!");
}
public byte[] getPayload()
{
if (payload == null)
{
TypesWriter tw = new TypesWriter();
tw.writeByte(Packets.SSH_MSG_KEXINIT);
tw.writeBytes(kp.cookie, 0, 16);
tw.writeNameList(kp.kex_algorithms);
tw.writeNameList(kp.server_host_key_algorithms);
tw.writeNameList(kp.encryption_algorithms_client_to_server);
tw.writeNameList(kp.encryption_algorithms_server_to_client);
tw.writeNameList(kp.mac_algorithms_client_to_server);
tw.writeNameList(kp.mac_algorithms_server_to_client);
tw.writeNameList(kp.compression_algorithms_client_to_server);
tw.writeNameList(kp.compression_algorithms_server_to_client);
tw.writeNameList(kp.languages_client_to_server);
tw.writeNameList(kp.languages_server_to_client);
tw.writeBoolean(kp.first_kex_packet_follows);
tw.writeUINT32(kp.reserved_field1);
payload = tw.getBytes();
}
return payload;
}
public KexParameters getKexParameters()
{
return kp;
}
public String[] getCompression_algorithms_client_to_server()
{
return kp.compression_algorithms_client_to_server;
}
public String[] getCompression_algorithms_server_to_client()
{
return kp.compression_algorithms_server_to_client;
}
public byte[] getCookie()
{
return kp.cookie;
}
public String[] getEncryption_algorithms_client_to_server()
{
return kp.encryption_algorithms_client_to_server;
}
public String[] getEncryption_algorithms_server_to_client()
{
return kp.encryption_algorithms_server_to_client;
}
public boolean isFirst_kex_packet_follows()
{
return kp.first_kex_packet_follows;
}
public String[] getKex_algorithms()
{
return kp.kex_algorithms;
}
public String[] getLanguages_client_to_server()
{
return kp.languages_client_to_server;
}
public String[] getLanguages_server_to_client()
{
return kp.languages_server_to_client;
}
public String[] getMac_algorithms_client_to_server()
{
return kp.mac_algorithms_client_to_server;
}
public String[] getMac_algorithms_server_to_client()
{
return kp.mac_algorithms_server_to_client;
}
public int getReserved_field1()
{
return kp.reserved_field1;
}
public String[] getServer_host_key_algorithms()
{
return kp.server_host_key_algorithms;
}
}
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