[incr Tcl] is a set of extensions to the Tcl language for object-oriented programming. [incr Tcl] (itcl) provides the extra language support needed to build large Tcl/Tk applications. It introduces the notion of objects, which act as building blocks for an application. Each object is a bag of data with a set of procedures or "methods" that are used to manipulate it. Objects are organized into "classes" with identical characteristics, and classes can inherit functionality from one another.
nsmhash is an AOLserver module and Tcl package that implements an interface to the mhash library (libmhash). It supports hash, hmac, and key generation algorithms (such as SHA1, MD5, MCRYPT, and S2K_SALTED), and it also supports sharing with nsv_* commands. It was tested with AOLserver 3.4.x and 4.0.x and Tcl 8.4.