/**
* Parse a {@link HeartbeatMessage} from a {@link Stream}.
*
* @param input
* the {@link Stream} to parse from.
* @return a {@link HeartbeatMessage} object.
* @throws IOException
*/
public static HeartbeatMessage Parse(Stream input)
{
byte type = TlsUtilities.ReadUint8(input);
if (!HeartbeatMessageType.IsValid(type))
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
int payload_length = TlsUtilities.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);
}
TlsUtilities.CheckUint16(buf.Length);
int padding_length = (int)buf.Length - payload.Length;
/*
* RFC 6520 4. The padding of a received HeartbeatMessage message MUST be ignored
*/
return(new HeartbeatMessage(type, payload, padding_length));
}
public HeartbeatMessage(byte type, byte[] payload, int paddingLength)
{
if (!HeartbeatMessageType.IsValid(type))
{
throw new ArgumentException("not a valid HeartbeatMessageType value", "type");
}
if (payload == null || payload.Length >= (1 << 16))
{
throw new ArgumentException("must have length < 2^16", "payload");
}
if (paddingLength < 16)
{
throw new ArgumentException("must be at least 16", "paddingLength");
}
this.mType = type;
this.mPayload = payload;
this.mPaddingLength = paddingLength;
}