We release a set of new implementation packages and documentation, which together describes and provides examples of optimization techniques for Keccak on various platforms. Among the implementation techniques is a new in-place processing of Keccak-f, which allows implementations that are both compact and efficient on microcontrollers and other constrained devices.
The released documents and packages include:
By applying in-place processing to the ARM Cortex-M3 (implementation by Ronny Van Keer), Keccak takes about 95 cycles/byte for long messages and uses less than 280 bytes of RAM on the stack, according to our measurements. This and other new implementations have been submitted to eBASH and XBX for independent benchmarking.