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    • 4. 发明专利
    • Arithmetic unit
    • 算术单位
    • JP2013045072A
    • 2013-03-04
    • JP2011184938
    • 2011-08-26
    • Toshiba Corp株式会社東芝
    • SHIMIZU HIDEO
    • G09C1/00
    • G06F9/3001G06F12/0215G06F21/602G06F2212/1008H04L9/0631H04L2209/122
    • PROBLEM TO BE SOLVED: To miniaturize an arithmetic unit.SOLUTION: An arithmetic unit is connected to a storage unit where N pieces of data are stored in consecutive addresses with respect to each type of the data, to execute operations in a preliminarily determined cryptographic method. The arithmetic unit includes an operation section, an address generation section, and a control section. The operation section executes a plurality of kinds of arithmetic processing for use in the cryptographic method. The address generation section generates an address in the storage unit where data for use in arithmetic processing is stored, on the basis of upper bits of an address of a leading piece of data out of N pieces of data of a type for use in arithmetic processing and an offset which is a value corresponding to a counter value updated in response to designation and is based on the address of the leading piece of data. The control section controls the operation section to execute arithmetic processing in the order determined by the cryptographic method and designates updating of the counter value at timing when the type of data for use in arithmetic processing is changed and at timing when data for use in arithmetic processing is changed.
    • 要解决的问题:为了使算术单元小型化。 解决方案:算术单元连接到存储单元,其中N个数据相对于每种类型的数据存储在连续地址中,以预先确定的密码方式执行操作。 算术单元包括操作部分,地址生成部分和控制部分。 操作部分执行用于密码方法的多种运算处理。 地址生成部生成存储在数据处理用数据的存储单元中的地址,基于用于算术处理的N个数据类型的数据中的前导数据的地址的高位 以及偏移量,其是对应于响应于指定而更新的计数器值的偏移量,并且基于前导数据的地址。 控制部分控制操作部分按照由密码方法确定的顺序执行算术处理,并且在用于算术处理的数据类型改变的定时和在算术处理中使用的数据的定时指定计数器值的更新 改变了 版权所有(C)2013,JPO&INPIT