Arithmetic method and apparatus and crypto processing apparatus for performing multiple types of cryptography
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United States of America Patent
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Oct 2, 2007
Grant Date -
N/A
app pub date -
Jan 19, 2000
filing date -
Jan 20, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An arithmetic apparatus for performing a long product-sum operation includes an integer unit arithmetic circuit, a finite field GF(2^m) based unit arithmetic circuit logically adjacent to the integer unit arithmetic circuit, a selector for selecting the integer unit arithmetic circuit or the finite field GF(2^m) based unit arithmetic circuit, and an adder circuit which has a buffer for storing interim result data, adds the interim result data to the result data obtained by one of the integer unit arithmetic circuit and the finite field GF(2^m) based unit arithmetic circuit which is selected by the selector, propagates a carry in an integer unit arithmetic operation, and propagates no carry in a finite field GF(2^m) based unit arithmetic operation.
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