| 摘要 |
<p>A construction with an improved compression-function execution section is achieved. A data conversion process with use of a plurality of compression-function execution sections and through a plurality of process sequences in which divided data blocks constituting message data are processed in parallel is executed. Each of the plurality of compression-function execution sections performs a process with use of a message scheduling section which receives a corresponding divided data block of the message data to perform a message scheduling process, and a process with use of a chaining variable processing section which receives both of an output from the message scheduling section and an intermediate value as an output from a preceding processing section to generate output data whose number of bits is same as that of the intermediate value through compression of received data. The plurality of compression-function execution sections, respectively performing parallel processing commonly use one or both of the message scheduling section and the chaining variable processing section, and allow a single message scheduling section or a single chaining variable processing section to be utilized. Downsizing of a hardware configuration and simplification of processing steps are achieved by such a construction.</p> |
