A Whirlpool cryptographic hashing hardware accelerator targeted for automotive security is fabricated in 14nm tri-gate CMOS with 640MHz operation and throughput of 33Gbps, measured at 750mV, 25°C. Pre-addition of key and message with delayed round computation, Galois Field arithmetic optimized Sbox and multiply-less Galois Field scaling with fused reduction results in 23% area reduction compared to a conventional LUT-based design. Fully-combinational Sbox implementation enables robust sub-threshold operation down to 225mV, with a peak energy efficiency of 1.5Tbps/W measured at 250mV.
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