@@ -17,10 +17,25 @@
 #import "OFAutoreleasePool.h"
 #import "OFExceptions.h"
 #import "macros.h"
 
 int _OFHashing_reference;
+
+@implementation OFHash
+- (void)updateWithBuffer: (const char*)buffer
+		  ofSize: (size_t)size
+{
+	@throw [OFNotImplementedException newWithClass: isa
+					      selector: _cmd];
+}
+
+- (uint8_t*)digest
+{
+	@throw [OFNotImplementedException newWithClass: isa
+					      selector: _cmd];
+}
+@end
 
 /*
  * MD5
  */