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package org.whispersystems.libaxolotl.state;
import org.whispersystems.libaxolotl.IdentityKey;
import org.whispersystems.libaxolotl.IdentityKeyPair;
/**
* Provides an interface to identity information.
*
* @author Moxie Marlinspike
*/
public interface IdentityKeyStore {
/**
* Get the local client's identity key pair.
*
* @return The local client's persistent identity key pair.
*/
public IdentityKeyPair getIdentityKeyPair();
/**
* Return the local client's registration ID.
* <p>
* Clients should maintain a registration ID, a random number
* between 1 and 16380 that's generated once at install time.
*
* @return the local client's registration ID.
*/
public int getLocalRegistrationId();
/**
* Save a remote client's identity key
* <p>
* Store a remote client's identity key as trusted.
*
* @param recipientId The recipient ID of the remote client.
* @param identityKey The remote client's identity key.
*/
public void saveIdentity(long recipientId, IdentityKey identityKey);
/**
* Verify a remote client's identity key.
* <p>
* Determine whether a remote client's identity is trusted. Convention is
* that the TextSecure protocol is 'trust on first use.' This means that
* an identity key is considered 'trusted' if there is no entry for the recipient
* in the local store, or if it matches the saved key for a recipient in the local
* store. Only if it mismatches an entry in the local store is it considered
* 'untrusted.'
*
* @param recipientId The recipient ID of the remote client.
* @param identityKey The identity key to verify.
* @return true if trusted, false if untrusted.
*/
public boolean isTrustedIdentity(long recipientId, IdentityKey identityKey);
}
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