System.arraycopy(nonce, 0, seed, label.length, nonce.length);
DerivationAlgorithm algo =
AlgoFactory.getInstance(ConversationConstants.DerivationAlgorithm.P_SHA_1);
derivedKeyBytes = algo.createKey(ephemeralKey, seed, offset, length);
// Add the DKTs
dkt = new DerivedKeyToken(wscVersion, document);
dktId = getWsConfig().getIdAllocator().createId("DK-", dkt);