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https://github.com/signalapp/Signal-Android.git
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0ace469d74
1) In addition to the Recipient interface, there is now RecipientDevice. A Recipient can have multiple corresponding RecipientDevices. All addressing is done to a Recipient, but crypto sessions and transport delivery are done to RecipientDevice. 2) The Push transport handles the discovery and session setup of additional Recipient devices. 3) Some internal rejiggering of Groups.
96 lines
3.8 KiB
Java
96 lines
3.8 KiB
Java
package org.whispersystems.textsecure.storage;
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import android.content.Context;
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import android.util.Log;
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import org.whispersystems.textsecure.crypto.IdentityKey;
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import org.whispersystems.textsecure.crypto.MasterSecret;
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/**
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* Helper class for generating key pairs and calculating ECDH agreements.
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*
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* @author Moxie Marlinspike
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*/
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public class Session {
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public static void clearV1SessionFor(Context context, CanonicalRecipient recipient) {
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//XXX Obviously we should probably do something more thorough here eventually.
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LocalKeyRecord.delete(context, recipient);
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RemoteKeyRecord.delete(context, recipient);
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SessionRecordV1.delete(context, recipient);
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}
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public static void abortSessionFor(Context context, CanonicalRecipient recipient) {
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Log.w("Session", "Aborting session, deleting keys...");
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clearV1SessionFor(context, recipient);
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SessionRecordV2.deleteAll(context, recipient);
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}
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public static boolean hasSession(Context context, MasterSecret masterSecret,
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CanonicalRecipient recipient)
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{
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Log.w("Session", "Checking session...");
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return hasV1Session(context, recipient) || hasV2Session(context, masterSecret, recipient);
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}
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public static boolean hasRemoteIdentityKey(Context context,
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MasterSecret masterSecret,
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CanonicalRecipient recipient)
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{
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return (hasV2Session(context, masterSecret, recipient) || (hasV1Session(context, recipient) &&
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new SessionRecordV1(context, masterSecret, recipient).getIdentityKey() != null));
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}
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private static boolean hasV2Session(Context context, MasterSecret masterSecret,
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CanonicalRecipient recipient)
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{
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return SessionRecordV2.hasSession(context, masterSecret, recipient.getRecipientId(),
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RecipientDevice.DEFAULT_DEVICE_ID);
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}
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private static boolean hasV1Session(Context context, CanonicalRecipient recipient) {
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return SessionRecordV1.hasSession(context, recipient) &&
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RemoteKeyRecord.hasRecord(context, recipient) &&
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LocalKeyRecord.hasRecord(context, recipient);
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}
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public static IdentityKey getRemoteIdentityKey(Context context, MasterSecret masterSecret,
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CanonicalRecipient recipient)
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{
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return getRemoteIdentityKey(context, masterSecret, recipient.getRecipientId());
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}
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public static IdentityKey getRemoteIdentityKey(Context context,
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MasterSecret masterSecret,
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long recipientId)
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{
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if (SessionRecordV2.hasSession(context, masterSecret, recipientId,
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RecipientDevice.DEFAULT_DEVICE_ID))
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{
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return new SessionRecordV2(context, masterSecret, recipientId,
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RecipientDevice.DEFAULT_DEVICE_ID).getRemoteIdentityKey();
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} else if (SessionRecordV1.hasSession(context, recipientId)) {
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return new SessionRecordV1(context, masterSecret, recipientId).getIdentityKey();
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} else {
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return null;
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}
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}
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public static int getSessionVersion(Context context, MasterSecret masterSecret,
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CanonicalRecipient recipient)
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{
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if (SessionRecordV2.hasSession(context, masterSecret,
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recipient.getRecipientId(),
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RecipientDevice.DEFAULT_DEVICE_ID))
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{
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return new SessionRecordV2(context, masterSecret, recipient.getRecipientId(),
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RecipientDevice.DEFAULT_DEVICE_ID).getSessionVersion();
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} else if (SessionRecordV1.hasSession(context, recipient)) {
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return new SessionRecordV1(context, masterSecret, recipient).getSessionVersion();
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}
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return 0;
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}
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}
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