The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 14, 2011
Filed:
Oct. 17, 2007
Applicant:
Hiroshi Satou, Tokyo, JP;
Inventor:
Hiroshi Satou, Tokyo, JP;
Assignee:
Oki Semiconductor Co., Ltd., , JP;
Primary Examiner:
Int. Cl.
CPC ...
H04L 9/32 (2006.01); G06F 11/30 (2006.01); G06F 12/14 (2006.01); H04K 1/00 (2006.01); H04L 9/00 (2006.01); H04L 9/28 (2006.01); H04L 9/30 (2006.01);
U.S. Cl.
CPC ...
Abstract
A Secure Hash Algorithm (SHA) operation circuit includes plural storages for storing the variables of the SHA calculation, a permutation section for permuting the output signals of the storages, and an arithmetic unit for calculating a temporary value by the use of the output signals of the storages and a data segment successively extracted from input data from which the hash value is to be obtained. When each data segment is processed, some of the storages are supplied with no clock signal and thereby maintain the values stored therein without change. The SHA operation circuit is thus capable of saving power.