| 摘要 |
Arithmetic unit for multiplying long integers modulo M and R.S.A. converter provided with such multiplication device. A systolized and modular arithmetic device has a control module, followed by a series arrangement of processing module, followed by a tail module. For multiplying an integer P and an integer Q modulo a third integer M, a provisional product is incremented each time with Q for a -1- bit in P, preceding by a doubling of the product. For a -0- bit only the doubling ensues. Normalizing mod M is effected by adding the complement of M, W, under control of propagated carry values. A similar procedure is proposed for exponentiation of Q. F.
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