/**
* This method accepts an array of MPIs, and returns a byte array containing a reversible
* serialization.
*
* @throws OTRException
*/
public static byte[] serializeMPIArray(MPI[] mpis) throws OTRException {
int totalsize = 0;
for (int i = 0; i < mpis.length; i++) {
totalsize += 4 + mpis[i].getLength();
}
totalsize += 4;
byte[] buf = new byte[totalsize];
OutBuf obuf = new OutBuf(buf);
obuf.writeUInt(mpis.length);
for (int i = 0; i < mpis.length; i++) {
mpis[i].write(obuf);
}
return obuf.getBytes();
}
/** Hash one or two MPIs. To hash only one MPI, b may be set to NULL. */
public static MPI hash(int version, MPI a, MPI b, Provider prov) throws OTRException {
int totalsize = 1 + 4 + a.getLength();
if (b != null) {
totalsize += 4 + b.getLength();
}
byte[] buf = new byte[totalsize];
OutBuf obuf = new OutBuf(buf);
obuf.writeByte((byte) version);
obuf.writeUInt(a.getLength());
a.writeRaw(obuf);
if (b != null) {
obuf.writeUInt(b.getLength());
b.writeRaw(obuf);
}
byte[] out = obuf.getBytes();
SHA256 sha = prov.getSHA256();
byte[] digest = sha.hash(out);
return new MPI(digest);
}
/**
* Transfers the control dependencies from a given {@link Exit} to the done {@link Exit}, creating
* one if necessary. The given {@link Exit} and its peer are then removed.
*/
private void mergeBreakExit(Exit breakExit) {
Exit doneExit = getExit(Exit.DONE);
if (doneExit == null) {
doneExit = makeExit(0, Exit.DONE);
}
OutBuf breakOutBuf = breakExit.getPeer();
OutBuf doneOutBuf = doneExit.getPeer();
Port donePort = doneOutBuf.getGoPort();
for (Entry breakEntry : breakOutBuf.getEntries()) {
Exit drivingExit = breakEntry.getDrivingExit();
Entry doneEntry = doneOutBuf.makeEntry(drivingExit);
doneEntry.addDependency(donePort, new ControlDependency(drivingExit.getDoneBus()));
}
breakOutBuf.disconnect();
breakExit.disconnect();
removeExit(breakExit);
}