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:
Oct. 29, 2013
Filed:
Nov. 25, 2009
Shigeru Nishikawa, Fujisawa, JP;
Akemi Kikuchi, Yokohama, JP;
Akihiko Yushiya, Tokyo, JP;
Shiori Wakino, Yokohama, JP;
Shigeru Nishikawa, Fujisawa, JP;
Akemi Kikuchi, Yokohama, JP;
Akihiko Yushiya, Tokyo, JP;
Shiori Wakino, Yokohama, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
A hash value calculation apparatus, which calculates a hash value of a message, includes: an input unit adapted to input an extended block obtained from a message to be processed; a hash value calculation unit adapted to execute a hash value calculation of the input block and to output a hash intermediate value; a plurality of intermediate value storage units adapted to store the hash intermediate value output by the hash value calculation unit for the message to be processed; an output unit adapted to output a hash intermediate value associated with all blocks of the message to be processed as a hash value of the message; and a hash value calculation control unit adapted to control hash value calculations for a plurality of messages by switching the intermediate value storage units used to store the hash intermediate value output from the hash value calculation unit.