eXtended eXternal Benchmarking eXtension (XXBX)

The eXtended eXternal Benchmarking eXtension (XXBX) is a tool for benchmarking the performance, memory usage, and power / energy consumption of cryptographic software on microcontrollers. It is an extension to the System for Unified Performance Evaluation Related to Cryptographic Operations and Primitives (SUPERCOP) which benchmarks a large variety of cryptographic primitives on general purpose computers. XXBX extends it in the sense that it allows for benchmarking on embedded platforms and adds metrics for RAM and ROM usage as well as power / energy consumption.

XXBX at HOST 2018

We presented a live hardware demonstration of the XXBX at the IEEE International Symposium on Hardware Oriented Security and Trust (HOST) 2018 held in McLean, VA, on April 30-May 4, 2018. The demonstration showed a MSP432P401R benchmarking the CAESAR finalist ASCON over a wide variety of input sizes. It was very well attended and Matthew Carter and Raghurama Velegala were very busy running the demonstration and explaining how XXBX works to the audience. The poster accompanying the demonstration is shown on the right and can be downloaded.

XXBX is comprised of the following components:

• The XBX benchmarking System (XBS) is software running on a Linux PC which cross-compiles cryptographic algorithms from SUPERCOP algopacks for the selected target microcontrollers, and orchestrates the benchmarking.
• The XBX Harness (XBH) is a microcontroller board which is connected to the PC running the XBS via Ethernet and to the target microcontroller (XBD) via I²C. It passes compiled programs, instructions and test data to the XBD and measures the execution time of the algorithm and the power consumption of the XBD.
• The XBX Power Shim (XBP) is a board that sits between the XBH and the XBD, captures and amplyfies the current drawn by XBD so that the ADC on the XBH can measure it.
• The XBX Device under test (XBD) is the board with the microcontroller that is being benchmarked. It runs the algorithms, tells the XBH when an algorithm starts and when it completes as well as how much space the algorithm consumes on the stack.

The picture below shows the XBH on the bottom. Attached to its top is the small XBP and the XBD is the top most board.

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