/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko.sync.jpake.stage;
import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import org.mozilla.gecko.sync.ExtendedJSONObject;
import org.mozilla.gecko.sync.Logger;
import org.mozilla.gecko.sync.NonObjectJSONException;
import org.mozilla.gecko.sync.jpake.IncorrectZkpException;
import org.mozilla.gecko.sync.jpake.JPakeClient;
import org.mozilla.gecko.sync.jpake.JPakeCrypto;
import org.mozilla.gecko.sync.jpake.Zkp;
import org.mozilla.gecko.sync.setup.Constants;
public class ComputeFinalStage extends JPakeStage {
@Override
public void execute(JPakeClient jClient) {
Logger.debug(LOG_TAG, "Computing final round.");
// Check incoming message type.
if (!jClient.jIncoming.get(Constants.JSON_KEY_TYPE).equals(jClient.theirSignerId + "2")) {
Logger.error(LOG_TAG, "Invalid round 2 message: " + jClient.jIncoming.toJSONString());
jClient.abort(Constants.JPAKE_ERROR_WRONGMESSAGE);
return;
}
// Check incoming message fields.
ExtendedJSONObject iPayload;
ExtendedJSONObject zkpPayload;
try {
iPayload = jClient.jIncoming.getObject(Constants.JSON_KEY_PAYLOAD);
if (iPayload == null
|| iPayload.getObject(Constants.ZKP_KEY_ZKP_A) == null) {
Logger.error(LOG_TAG,
"Invalid round 2 message: " + jClient.jIncoming.toJSONString());
jClient.abort(Constants.JPAKE_ERROR_WRONGMESSAGE);
return;
}
zkpPayload = iPayload.getObject(Constants.ZKP_KEY_ZKP_A);
} catch (NonObjectJSONException e) {
Logger.error(LOG_TAG, "JSON object Exception.", e);
jClient.abort(Constants.JPAKE_ERROR_INVALID);
return;
}
if (!jClient.theirSignerId.equals(zkpPayload.get(Constants.ZKP_KEY_ID))) {
Logger.error(LOG_TAG, "Invalid round 2 message: " + jClient.jIncoming.toJSONString());
jClient.abort(Constants.JPAKE_ERROR_WRONGMESSAGE);
return;
}
// Extract fields.
jClient.jParty.otherA = new BigInteger((String) iPayload.get(Constants.ZKP_KEY_A), 16);
// Extract ZKP.
String gr = (String) zkpPayload.get(Constants.ZKP_KEY_GR);
String b = (String) zkpPayload.get(Constants.ZKP_KEY_B);
String id = (String) zkpPayload.get(Constants.ZKP_KEY_ID);
jClient.jParty.otherZkpA = new Zkp(new BigInteger(gr, 16), new BigInteger(b, 16), id);
jClient.myKeyBundle = null;
try {
jClient.myKeyBundle = JPakeCrypto.finalRound(JPakeClient.secretAsBigInteger(jClient.secret), jClient.jParty);
} catch (IncorrectZkpException e) {
Logger.error(LOG_TAG, "ZKP mismatch");
jClient.abort(Constants.JPAKE_ERROR_WRONGMESSAGE);
return;
} catch (NoSuchAlgorithmException e) {
Logger.error(LOG_TAG, "NoSuchAlgorithmException", e);
jClient.abort(Constants.JPAKE_ERROR_INTERNAL);
return;
} catch (InvalidKeyException e) {
Logger.error(LOG_TAG, "InvalidKeyException", e);
jClient.abort(Constants.JPAKE_ERROR_INTERNAL);
return;
} catch (UnsupportedEncodingException e) {
Logger.error(LOG_TAG, "UnsupportedEncodingException", e);
jClient.abort(Constants.JPAKE_ERROR_INTERNAL);
return;
}
// Run next stage.
jClient.runNextStage();
}
}