Data converter, data conversion method and program

A data conversion method executed by a data converter, the data conversion method comprising:

• receiving message data using a receiver;
• executing, using a processor, a data conversion process to generate a hash value, the data conversion process including a plurality of compression-function execution sections and a plurality of respective process sequences in which a plurality of divided data blocks constituting the message data are processed in parallel,
• wherein each compression-function execution section performs:
• a message scheduling process, using a message scheduling section, which receives a corresponding divided data block of the message data the message scheduling section including a first transposition-function executing section, which repeatedly executes a transposition process to output a first intermediate value;
• and
• a chaining variable process, using a chaining variable processing section, which
• receives the first intermediate value and a second intermediate value having a first number of bits, the second intermediate value being an output from a preceding processing section, and
• generates output data having a second number of bits, which is the same as the first number of bits,
• wherein the compression-function execution sections, respectively performing parallel processing in the plurality of process sequences, commonly use one or both of the message scheduling section and the chaining variable processing section, and perform a process with use of a single message scheduling section or a single chaining variable processing section, and
• wherein:
• the compression-function execution sections include a single common chaining variable processing section which is commonly used by the compression-function execution sections
• the message scheduling sections in the compression-function execution sections receive the same divided data block and provide an output to the common chaining variable processing section, and
• the common chaining variable processing section receives both of the output and a third intermediate value as an output from a preceding compression-function execution section.

A non-transitory computer-readable medium storing instructions for causing a computer to execute a control process, the process comprising:

• receiving message data using a receiver;
• executing, using a processor, a data conversion process to generate a hash value, the data conversion process including a plurality of compression-function execution sections and a plurality of respective process sequences in which a plurality of divided data blocks constituting the message data are processed in parallel,
• wherein each compression-function execution section performs:
• a message scheduling process, using a message scheduling section, which receives a corresponding divided data block of the message data the message scheduling section including a first transposition-function executing section, which repeatedly executes a transposition process to output a first intermediate value;
• and
• a chaining variable process, using a chaining variable processing section, which
• receives the first intermediate value and a second intermediate value having a first number of bits, the second intermediate value being an output from a preceding processing section, and
• generates output data having a second number of bits, which is the same as the first number of bits,
• wherein the plurality of compression-function execution sections, respectively performing parallel processing in the plurality of process sequences, commonly use one or both of the message scheduling section and the chaining variable processing section, and perform a process with use of a single message scheduling section or a single chaining variable processing section, and
• wherein:
• the compression-function execution sections include a single common chaining variable processing section which is commonly used by the compression-function execution sections,
• the message scheduling sections in the compression-function execution sections receive the same divided data block and provide an output to the common chaining variable processing section, and
• the common chaining variable processing section receives both of the output and a third intermediate value as an output from a preceding compression-function execution section.