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:
Apr. 08, 2025
Filed:
May. 04, 2023
Silicon Motion, Inc., Zhubei, TW;
Wun-Jhe Wu, Kinmen County, TW;
Po-Hung Chen, Taoyuan, TW;
Chiao-Wen Cheng, Zhubei, TW;
Jiun-Hung Yu, Zhubei, TW;
Chih-Wei Liu, Zhubei, TW;
SILICON MOTION, INC., Zhubei, TW;
Abstract
The invention introduces an apparatus and a method for expanding round keys during data encryption. The method includes: configuring a word-processing circuitry to operate in a first mode to calculate a first intermediate calculation result corresponding to an even-number round key according to a last double word of a 0double word to a 7double word in each even-number clock cycle starting from a 2clock cycle; and configuring the word-processing circuitry to operate in a second mode to calculate a second intermediate calculation result corresponding to an odd-number round key according to the last double word of the 0double word to the 7double word in each odd-number clock cycle starting from a 3clock cycle. In the first mode, a first data path is formed in the word-processing circuitry, which includes a word split circuitry, a rotate-word circuitry, a substitute-word circuitry, a round-constant circuitry and a word concatenation circuitry. In the second mode, a second data path is formed in the word-processing circuitry, which includes the word split circuitry, the substitute-word circuitry and the word concatenation circuitry.