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package org.bouncycastle.crypto.tls;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.io.Streams;
public class HeartbeatMessage
{
protected short type;
protected byte[] payload;
protected int paddingLength;
public HeartbeatMessage(short type, byte[] payload, int paddingLength)
{
if (!HeartbeatMessageType.isValid(type))
{
throw new IllegalArgumentException("'type' is not a valid HeartbeatMessageType value");
}
if (payload == null || payload.length >= (1 << 16))
{
throw new IllegalArgumentException("'payload' must have length < 2^16");
}
if (paddingLength < 16)
{
throw new IllegalArgumentException("'paddingLength' must be at least 16");
}
this.type = type;
this.payload = payload;
this.paddingLength = paddingLength;
}
/**
* Encode this {@link HeartbeatMessage} to an {@link OutputStream}.
*
* @param output
* the {@link OutputStream} to encode to.
* @throws IOException
*/
public void encode(TlsContext context, OutputStream output) throws IOException
{
TlsUtils.writeUint8(type, output);
TlsUtils.checkUint16(payload.length);
TlsUtils.writeUint16(payload.length, output);
output.write(payload);
byte[] padding = new byte[paddingLength];
context.getNonceRandomGenerator().nextBytes(padding);
output.write(padding);
}
/**
* Parse a {@link HeartbeatMessage} from an {@link InputStream}.
*
* @param input
* the {@link InputStream} to parse from.
* @return a {@link HeartbeatMessage} object.
* @throws IOException
*/
public static HeartbeatMessage parse(InputStream input) throws IOException
{
short type = TlsUtils.readUint8(input);
if (!HeartbeatMessageType.isValid(type))
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
int payload_length = TlsUtils.readUint16(input);
PayloadBuffer buf = new PayloadBuffer();
Streams.pipeAll(input, buf);
byte[] payload = buf.toTruncatedByteArray(payload_length);
if (payload == null)
{
/*
* RFC 6520 4. If the payload_length of a received HeartbeatMessage is too large, the
* received HeartbeatMessage MUST be discarded silently.
*/
return null;
}
int padding_length = buf.size() - payload.length;
/*
* RFC 6520 4. The padding of a received HeartbeatMessage message MUST be ignored
*/
return new HeartbeatMessage(type, payload, padding_length);
}
static class PayloadBuffer extends ByteArrayOutputStream
{
byte[] toTruncatedByteArray(int payloadLength)
{
/*
* RFC 6520 4. The padding_length MUST be at least 16.
*/
int minimumCount = payloadLength + 16;
if (count < minimumCount)
{
return null;
}
return Arrays.copyOf(buf, payloadLength);
}
}
}
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