Arithmetic method and apparatus and crypto processing apparatus for performing multiple types of cryptography
US7277540B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 2000 |
| Grant date | Oct 2, 2007 |
| Priority date | — |
| Expiry date | Jan 19, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F7/724
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.