@@ -136,10 +136,15 @@
 
 + (size_t)blockSize
 {
 	return 64;
 }
+
++ (instancetype)hash
+{
+	return [[[self alloc] init] autorelease];
+}
 
 - init
 {
 	self = [super init];
 
@@ -190,6 +195,11 @@
 
 	_calculated = YES;
 
 	return _digest;
 }
+
+- (BOOL)isCalculated
+{
+	return _calculated;
+}
 @end