This page hosts a formal specification of tls_client_hello using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.
All parsing code for Java generated by Kaitai Struct depends on the Java runtime library. You have to install it before you can parse data.
The Java runtime library is published in the Maven Central Repository. Refer to the artifact page for instructions how to add it into your project with the build tool that you use.
Parse a local file and get structure in memory:
TlsClientHello data = TlsClientHello.fromFile("path/to/local/file.bin");
Or parse structure from a byte array:
byte[] someArray = new byte[] { ... };
TlsClientHello data = new TlsClientHello(new ByteBufferKaitaiStream(someArray));
After that, one can get various attributes from the structure by invoking getter methods like:
data.version() // => get version
// This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
import io.kaitai.struct.ByteBufferKaitaiStream;
import io.kaitai.struct.KaitaiStruct;
import io.kaitai.struct.KaitaiStream;
import java.io.IOException;
import java.util.ArrayList;
public class TlsClientHello extends KaitaiStruct {
public static TlsClientHello fromFile(String fileName) throws IOException {
return new TlsClientHello(new ByteBufferKaitaiStream(fileName));
}
public TlsClientHello(KaitaiStream _io) {
this(_io, null, null);
}
public TlsClientHello(KaitaiStream _io, KaitaiStruct _parent) {
this(_io, _parent, null);
}
public TlsClientHello(KaitaiStream _io, KaitaiStruct _parent, TlsClientHello _root) {
super(_io);
this._parent = _parent;
this._root = _root == null ? this : _root;
_read();
}
private void _read() {
this.version = new Version(this._io, this, _root);
this.random = new Random(this._io, this, _root);
this.sessionId = new SessionId(this._io, this, _root);
this.cipherSuites = new CipherSuites(this._io, this, _root);
this.compressionMethods = new CompressionMethods(this._io, this, _root);
if (_io().isEof() == false) {
this.extensions = new Extensions(this._io, this, _root);
}
}
public static class ServerName extends KaitaiStruct {
public static ServerName fromFile(String fileName) throws IOException {
return new ServerName(new ByteBufferKaitaiStream(fileName));
}
public ServerName(KaitaiStream _io) {
this(_io, null, null);
}
public ServerName(KaitaiStream _io, TlsClientHello.Sni _parent) {
this(_io, _parent, null);
}
public ServerName(KaitaiStream _io, TlsClientHello.Sni _parent, TlsClientHello _root) {
super(_io);
this._parent = _parent;
this._root = _root;
_read();
}
private void _read() {
this.nameType = this._io.readU1();
this.length = this._io.readU2be();
this.hostName = this._io.readBytes(length());
}
private int nameType;
private int length;
private byte[] hostName;
private TlsClientHello _root;
private TlsClientHello.Sni _parent;
public int nameType() { return nameType; }
public int length() { return length; }
public byte[] hostName() { return hostName; }
public TlsClientHello _root() { return _root; }
public TlsClientHello.Sni _parent() { return _parent; }
}
public static class Random extends KaitaiStruct {
public static Random fromFile(String fileName) throws IOException {
return new Random(new ByteBufferKaitaiStream(fileName));
}
public Random(KaitaiStream _io) {
this(_io, null, null);
}
public Random(KaitaiStream _io, TlsClientHello _parent) {
this(_io, _parent, null);
}
public Random(KaitaiStream _io, TlsClientHello _parent, TlsClientHello _root) {
super(_io);
this._parent = _parent;
this._root = _root;
_read();
}
private void _read() {
this.gmtUnixTime = this._io.readU4be();
this.random = this._io.readBytes(28);
}
private long gmtUnixTime;
private byte[] random;
private TlsClientHello _root;
private TlsClientHello _parent;
public long gmtUnixTime() { return gmtUnixTime; }
public byte[] random() { return random; }
public TlsClientHello _root() { return _root; }
public TlsClientHello _parent() { return _parent; }
}
public static class SessionId extends KaitaiStruct {
public static SessionId fromFile(String fileName) throws IOException {
return new SessionId(new ByteBufferKaitaiStream(fileName));
}
public SessionId(KaitaiStream _io) {
this(_io, null, null);
}
public SessionId(KaitaiStream _io, TlsClientHello _parent) {
this(_io, _parent, null);
}
public SessionId(KaitaiStream _io, TlsClientHello _parent, TlsClientHello _root) {
super(_io);
this._parent = _parent;
this._root = _root;
_read();
}
private void _read() {
this.len = this._io.readU1();
this.sid = this._io.readBytes(len());
}
private int len;
private byte[] sid;
private TlsClientHello _root;
private TlsClientHello _parent;
public int len() { return len; }
public byte[] sid() { return sid; }
public TlsClientHello _root() { return _root; }
public TlsClientHello _parent() { return _parent; }
}
public static class Sni extends KaitaiStruct {
public static Sni fromFile(String fileName) throws IOException {
return new Sni(new ByteBufferKaitaiStream(fileName));
}
public Sni(KaitaiStream _io) {
this(_io, null, null);
}
public Sni(KaitaiStream _io, TlsClientHello.Extension _parent) {
this(_io, _parent, null);
}
public Sni(KaitaiStream _io, TlsClientHello.Extension _parent, TlsClientHello _root) {
super(_io);
this._parent = _parent;
this._root = _root;
_read();
}
private void _read() {
this.listLength = this._io.readU2be();
this.serverNames = new ArrayList<ServerName>();
{
int i = 0;
while (!this._io.isEof()) {
this.serverNames.add(new ServerName(this._io, this, _root));
i++;
}
}
}
private int listLength;
private ArrayList<ServerName> serverNames;
private TlsClientHello _root;
private TlsClientHello.Extension _parent;
public int listLength() { return listLength; }
public ArrayList<ServerName> serverNames() { return serverNames; }
public TlsClientHello _root() { return _root; }
public TlsClientHello.Extension _parent() { return _parent; }
}
public static class CipherSuites extends KaitaiStruct {
public static CipherSuites fromFile(String fileName) throws IOException {
return new CipherSuites(new ByteBufferKaitaiStream(fileName));
}
public CipherSuites(KaitaiStream _io) {
this(_io, null, null);
}
public CipherSuites(KaitaiStream _io, TlsClientHello _parent) {
this(_io, _parent, null);
}
public CipherSuites(KaitaiStream _io, TlsClientHello _parent, TlsClientHello _root) {
super(_io);
this._parent = _parent;
this._root = _root;
_read();
}
private void _read() {
this.len = this._io.readU2be();
this.cipherSuites = new ArrayList<Integer>();
for (int i = 0; i < (len() / 2); i++) {
this.cipherSuites.add(this._io.readU2be());
}
}
private int len;
private ArrayList<Integer> cipherSuites;
private TlsClientHello _root;
private TlsClientHello _parent;
public int len() { return len; }
public ArrayList<Integer> cipherSuites() { return cipherSuites; }
public TlsClientHello _root() { return _root; }
public TlsClientHello _parent() { return _parent; }
}
public static class CompressionMethods extends KaitaiStruct {
public static CompressionMethods fromFile(String fileName) throws IOException {
return new CompressionMethods(new ByteBufferKaitaiStream(fileName));
}
public CompressionMethods(KaitaiStream _io) {
this(_io, null, null);
}
public CompressionMethods(KaitaiStream _io, TlsClientHello _parent) {
this(_io, _parent, null);
}
public CompressionMethods(KaitaiStream _io, TlsClientHello _parent, TlsClientHello _root) {
super(_io);
this._parent = _parent;
this._root = _root;
_read();
}
private void _read() {
this.len = this._io.readU1();
this.compressionMethods = this._io.readBytes(len());
}
private int len;
private byte[] compressionMethods;
private TlsClientHello _root;
private TlsClientHello _parent;
public int len() { return len; }
public byte[] compressionMethods() { return compressionMethods; }
public TlsClientHello _root() { return _root; }
public TlsClientHello _parent() { return _parent; }
}
public static class Alpn extends KaitaiStruct {
public static Alpn fromFile(String fileName) throws IOException {
return new Alpn(new ByteBufferKaitaiStream(fileName));
}
public Alpn(KaitaiStream _io) {
this(_io, null, null);
}
public Alpn(KaitaiStream _io, TlsClientHello.Extension _parent) {
this(_io, _parent, null);
}
public Alpn(KaitaiStream _io, TlsClientHello.Extension _parent, TlsClientHello _root) {
super(_io);
this._parent = _parent;
this._root = _root;
_read();
}
private void _read() {
this.extLen = this._io.readU2be();
this.alpnProtocols = new ArrayList<Protocol>();
{
int i = 0;
while (!this._io.isEof()) {
this.alpnProtocols.add(new Protocol(this._io, this, _root));
i++;
}
}
}
private int extLen;
private ArrayList<Protocol> alpnProtocols;
private TlsClientHello _root;
private TlsClientHello.Extension _parent;
public int extLen() { return extLen; }
public ArrayList<Protocol> alpnProtocols() { return alpnProtocols; }
public TlsClientHello _root() { return _root; }
public TlsClientHello.Extension _parent() { return _parent; }
}
public static class Extensions extends KaitaiStruct {
public static Extensions fromFile(String fileName) throws IOException {
return new Extensions(new ByteBufferKaitaiStream(fileName));
}
public Extensions(KaitaiStream _io) {
this(_io, null, null);
}
public Extensions(KaitaiStream _io, TlsClientHello _parent) {
this(_io, _parent, null);
}
public Extensions(KaitaiStream _io, TlsClientHello _parent, TlsClientHello _root) {
super(_io);
this._parent = _parent;
this._root = _root;
_read();
}
private void _read() {
this.len = this._io.readU2be();
this.extensions = new ArrayList<Extension>();
{
int i = 0;
while (!this._io.isEof()) {
this.extensions.add(new Extension(this._io, this, _root));
i++;
}
}
}
private int len;
private ArrayList<Extension> extensions;
private TlsClientHello _root;
private TlsClientHello _parent;
public int len() { return len; }
public ArrayList<Extension> extensions() { return extensions; }
public TlsClientHello _root() { return _root; }
public TlsClientHello _parent() { return _parent; }
}
public static class Version extends KaitaiStruct {
public static Version fromFile(String fileName) throws IOException {
return new Version(new ByteBufferKaitaiStream(fileName));
}
public Version(KaitaiStream _io) {
this(_io, null, null);
}
public Version(KaitaiStream _io, TlsClientHello _parent) {
this(_io, _parent, null);
}
public Version(KaitaiStream _io, TlsClientHello _parent, TlsClientHello _root) {
super(_io);
this._parent = _parent;
this._root = _root;
_read();
}
private void _read() {
this.major = this._io.readU1();
this.minor = this._io.readU1();
}
private int major;
private int minor;
private TlsClientHello _root;
private TlsClientHello _parent;
public int major() { return major; }
public int minor() { return minor; }
public TlsClientHello _root() { return _root; }
public TlsClientHello _parent() { return _parent; }
}
public static class Protocol extends KaitaiStruct {
public static Protocol fromFile(String fileName) throws IOException {
return new Protocol(new ByteBufferKaitaiStream(fileName));
}
public Protocol(KaitaiStream _io) {
this(_io, null, null);
}
public Protocol(KaitaiStream _io, TlsClientHello.Alpn _parent) {
this(_io, _parent, null);
}
public Protocol(KaitaiStream _io, TlsClientHello.Alpn _parent, TlsClientHello _root) {
super(_io);
this._parent = _parent;
this._root = _root;
_read();
}
private void _read() {
this.strlen = this._io.readU1();
this.name = this._io.readBytes(strlen());
}
private int strlen;
private byte[] name;
private TlsClientHello _root;
private TlsClientHello.Alpn _parent;
public int strlen() { return strlen; }
public byte[] name() { return name; }
public TlsClientHello _root() { return _root; }
public TlsClientHello.Alpn _parent() { return _parent; }
}
public static class Extension extends KaitaiStruct {
public static Extension fromFile(String fileName) throws IOException {
return new Extension(new ByteBufferKaitaiStream(fileName));
}
public Extension(KaitaiStream _io) {
this(_io, null, null);
}
public Extension(KaitaiStream _io, TlsClientHello.Extensions _parent) {
this(_io, _parent, null);
}
public Extension(KaitaiStream _io, TlsClientHello.Extensions _parent, TlsClientHello _root) {
super(_io);
this._parent = _parent;
this._root = _root;
_read();
}
private void _read() {
this.type = this._io.readU2be();
this.len = this._io.readU2be();
switch (type()) {
case 0: {
this._raw_body = this._io.readBytes(len());
KaitaiStream _io__raw_body = new ByteBufferKaitaiStream(_raw_body);
this.body = new Sni(_io__raw_body, this, _root);
break;
}
case 16: {
this._raw_body = this._io.readBytes(len());
KaitaiStream _io__raw_body = new ByteBufferKaitaiStream(_raw_body);
this.body = new Alpn(_io__raw_body, this, _root);
break;
}
default: {
this.body = this._io.readBytes(len());
break;
}
}
}
private int type;
private int len;
private Object body;
private TlsClientHello _root;
private TlsClientHello.Extensions _parent;
private byte[] _raw_body;
public int type() { return type; }
public int len() { return len; }
public Object body() { return body; }
public TlsClientHello _root() { return _root; }
public TlsClientHello.Extensions _parent() { return _parent; }
public byte[] _raw_body() { return _raw_body; }
}
private Version version;
private Random random;
private SessionId sessionId;
private CipherSuites cipherSuites;
private CompressionMethods compressionMethods;
private Extensions extensions;
private TlsClientHello _root;
private KaitaiStruct _parent;
public Version version() { return version; }
public Random random() { return random; }
public SessionId sessionId() { return sessionId; }
public CipherSuites cipherSuites() { return cipherSuites; }
public CompressionMethods compressionMethods() { return compressionMethods; }
public Extensions extensions() { return extensions; }
public TlsClientHello _root() { return _root; }
public KaitaiStruct _parent() { return _parent; }
}