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2006-01-17 jrandom

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* First pass of the new tunnel creation crypto, specified in the new
      router/doc/tunnel-alt-creation.html (referenced in the current
      router/doc/tunnel-alt.html).  It isn't actually used anywhere yet, other
      than in the test code, but the code verifies the technical viability, so
      further scrutiny would be warranted.
This commit is contained in:
jrandom
2006-01-17 22:56:15 +00:00
committed by zzz
parent eb3442823e
commit a12ede096a
15 changed files with 1024 additions and 42 deletions
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52
router/java/src/net/i2p/data/i2np/TunnelBuildReplyMessage.java Normal file
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package net.i2p.data.i2np;
import java.io.*;
import net.i2p.I2PAppContext;
import net.i2p.data.*;
/**
* Transmitted from the new outbound endpoint to the creator through a
* reply tunnel
*/
public class TunnelBuildReplyMessage extends I2NPMessageImpl {
private ByteArray _records[];
public static final int MESSAGE_TYPE = 22;
public static final int RECORD_COUNT = TunnelBuildMessage.RECORD_COUNT;
public TunnelBuildReplyMessage(I2PAppContext context) {
super(context);
_records = new ByteArray[RECORD_COUNT];
}
public void setRecord(int index, ByteArray record) { _records[index] = record; }
public ByteArray getRecord(int index) { return _records[index]; }
public static final int RECORD_SIZE = TunnelBuildMessage.RECORD_SIZE;
protected int calculateWrittenLength() { return RECORD_SIZE * RECORD_COUNT; }
public int getType() { return MESSAGE_TYPE; }
public void readMessage(byte[] data, int offset, int dataSize, int type) throws I2NPMessageException, IOException {
if (type != MESSAGE_TYPE)
throw new I2NPMessageException("Message type is incorrect for this message");
if (dataSize != calculateWrittenLength())
throw new I2NPMessageException("Wrong length (expects " + calculateWrittenLength() + ", recv " + dataSize + ")");
for (int i = 0; i < RECORD_COUNT; i++) {
int off = offset + (i * RECORD_SIZE);
int len = RECORD_SIZE;
setRecord(i, new ByteArray(data, off, len));
}
}
protected int writeMessageBody(byte[] out, int curIndex) throws I2NPMessageException {
int remaining = out.length - (curIndex + calculateWrittenLength());
if (remaining <= 0)
throw new I2NPMessageException("Not large enough (too short by " + remaining + ")");
for (int i = 0; i < RECORD_COUNT; i++) {
System.arraycopy(_records[i].getData(), _records[i].getOffset(), out, curIndex, RECORD_SIZE);
curIndex += RECORD_SIZE;
}
return curIndex;
}
}