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package eu.siacs.conversations.crypto.sasl;
import org.conscrypt.Conscrypt;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLSocket;
import eu.siacs.conversations.entities.Account;
abstract class ScramPlusMechanism extends ScramMechanism {
private static final String EXPORTER_LABEL = "EXPORTER-Channel-Binding";
ScramPlusMechanism(Account account, ChannelBinding channelBinding) {
super(account, channelBinding);
}
@Override
protected byte[] getChannelBindingData(final SSLSocket sslSocket)
throws AuthenticationException {
if (sslSocket == null) {
throw new AuthenticationException("Channel binding attempt on non secure socket");
}
if (this.channelBinding == ChannelBinding.TLS_EXPORTER) {
try {
return Conscrypt.exportKeyingMaterial(sslSocket, EXPORTER_LABEL, new byte[0], 32);
} catch (final SSLException e) {
throw new AuthenticationException("Could not export keying material");
}
} else {
throw new AuthenticationException(
String.format("%s is not a valid channel binding", ChannelBinding.NONE));
}
}
}
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