The group of inventions relates to computing techniques and can be used for computing a hash function. The technical effect relates to increased speed of computations and improved capability of selecting a configuration of an apparatus. The apparatus comprises: a preliminary preparation unit having M inputs with a size of k bits, where M>1; M pipelined computation units running in parallel, each comprising: a memory module, a feedback disable module, an adder, a pipeline multiplier having L stages, a feedback unit, and an accumulation unit; and a combining unit.