/* 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 org.mozilla.gecko.sync.ExtendedJSONObject;
import org.mozilla.gecko.sync.Logger;
import org.mozilla.gecko.sync.crypto.CryptoException;
import org.mozilla.gecko.sync.crypto.KeyBundle;
import org.mozilla.gecko.sync.jpake.JPakeClient;
import org.mozilla.gecko.sync.setup.Constants;
public class ComputeKeyVerificationStage extends JPakeStage {
@Override
public void execute(JPakeClient jClient) {
Logger.debug(LOG_TAG, "Computing verification to send.");
if (jClient.myKeyBundle == null) {
Logger.error(LOG_TAG, "KeyBundle has not been set; aborting.");
jClient.abort(Constants.JPAKE_ERROR_INTERNAL);
return;
}
try {
jClient.jOutgoing = computeKeyVerification(jClient.myKeyBundle, jClient.mySignerId);
} catch (UnsupportedEncodingException e) {
Logger.error(LOG_TAG, "Failure in key verification.", e);
jClient.abort(Constants.JPAKE_ERROR_INVALID);
return;
} catch (CryptoException e) {
Logger.error(LOG_TAG, "Encryption failure in key verification.", e);
jClient.abort(Constants.JPAKE_ERROR_INTERNAL);
return;
}
jClient.runNextStage();
}
/*
* Helper function to compute a ciphertext, IV, and HMAC from derived
* keyBundle for verifying other party.
*
* (Made 'public' for testing and is a stateless function.)
*/
public ExtendedJSONObject computeKeyVerification(KeyBundle keyBundle, String signerId)
throws UnsupportedEncodingException, CryptoException
{
Logger.debug(LOG_TAG, "Encrypting key verification value.");
ExtendedJSONObject jPayload = JPakeClient.encryptPayload(JPakeClient.JPAKE_VERIFY_VALUE, keyBundle, true);
ExtendedJSONObject result = new ExtendedJSONObject();
result.put(Constants.JSON_KEY_TYPE, signerId + "3");
result.put(Constants.JSON_KEY_VERSION, JPakeClient.KEYEXCHANGE_VERSION);
result.put(Constants.JSON_KEY_PAYLOAD, jPayload.object);
return result;
}
}