The invention discloses a configurable multiplication device of which hardware implementation can be applied to an AES and RSA mixed algorithm hardware circuit, and belongs to the field of cryptographic algorithm hardware implementation. Compared with an implementation scheme based on an ordinary multiplier in the past, the device has the advantages that a large number of configurable circuits are adopted by designing a special circuit structure, large-area multipliers and adders are reused, an AES MixColumn function and an RSA multiplication function are achieved in one operational circuit on the basis of additionally consuming a small number of selectors, and compared with the method of implementing the two kinds of operation singly, less circuit area is consumed, and less logic is used.