/// <summary>
/// Append a timestamp component and a random nonce component to interest's
/// name. This ensures that the timestamp is greater than the timestamp used in
/// the previous call.
/// </summary>
///
/// <param name="interest">The interest whose name is append with components.</param>
/// <param name="wireFormat">A WireFormat object used to encode the SignatureInfo.</param>
public void prepareCommandInterestName(Interest interest,
WireFormat wireFormat)
{
double timestamp;
lock (lastUsedTimestampLock_) {
// nowOffsetMilliseconds_ is only used for testing.
double now = net.named_data.jndn.util.Common.getNowMilliseconds() + nowOffsetMilliseconds_;
timestamp = Math.Round(now, MidpointRounding.AwayFromZero);
while (timestamp <= lastUsedTimestamp_)
{
timestamp += 1.0d;
}
// Update the timestamp now while it is locked. In the small chance that
// signing fails, it just means that we have bumped the timestamp.
lastUsedTimestamp_ = timestamp;
}
// The timestamp is encoded as a TLV nonNegativeInteger.
TlvEncoder encoder = new TlvEncoder(8);
encoder.writeNonNegativeInteger((long)timestamp);
interest.getName().append(new Blob(encoder.getOutput(), false));
// The random value is a TLV nonNegativeInteger too, but we know it is 8
// bytes, so we don't need to call the nonNegativeInteger encoder.
ByteBuffer randomBuffer = ILOG.J2CsMapping.NIO.ByteBuffer.allocate(8);
// Note: SecureRandom is thread safe.
net.named_data.jndn.util.Common.getRandom().nextBytes(randomBuffer.array());
interest.getName().append(new Blob(randomBuffer, false));
}
/// <summary>
/// Append a timestamp component and a random value component to interest's
/// name. This ensures that the timestamp is greater than the timestamp used in
/// the previous call. Then use keyChain to sign the interest which appends a
/// SignatureInfo component and a component with the signature bits. If the
/// interest lifetime is not set, this sets it.
/// </summary>
///
/// <param name="interest">The interest whose name is append with components.</param>
/// <param name="keyChain">The KeyChain for calling sign.</param>
/// <param name="certificateName">The certificate name of the key to use for signing.</param>
/// <param name="wireFormat"></param>
public void generate(Interest interest, KeyChain keyChain,
Name certificateName, WireFormat wireFormat)
{
double timestamp;
lock (lastTimestampLock_) {
timestamp = Math.Round(net.named_data.jndn.util.Common.getNowMilliseconds(), MidpointRounding.AwayFromZero);
while (timestamp <= lastTimestamp_)
{
timestamp += 1.0d;
}
// Update the timestamp now while it is locked. In the small chance that
// signing fails, it just means that we have bumped the timestamp.
lastTimestamp_ = timestamp;
}
// The timestamp is encoded as a TLV nonNegativeInteger.
TlvEncoder encoder = new TlvEncoder(8);
encoder.writeNonNegativeInteger((long)timestamp);
interest.getName().append(new Blob(encoder.getOutput(), false));
// The random value is a TLV nonNegativeInteger too, but we know it is 8 bytes,
// so we don't need to call the nonNegativeInteger encoder.
ByteBuffer randomBuffer = ILOG.J2CsMapping.NIO.ByteBuffer.allocate(8);
// Note: SecureRandom is thread safe.
net.named_data.jndn.util.Common.getRandom().nextBytes(randomBuffer.array());
interest.getName().append(new Blob(randomBuffer, false));
keyChain.sign(interest, certificateName, wireFormat);
if (interest.getInterestLifetimeMilliseconds() < 0)
{
// The caller has not set the interest lifetime, so set it here.
interest.setInterestLifetimeMilliseconds(1000.0d);
}
}