FPGA/ASIC friendliness

FPGA/ASIC-friendly
Small S-boxes (variable or/and fixed)
Bit permutations
ASIC-friendly
Unusual yet simple transforms
e.g., integer addition with only partial carry (an adder with some holes punched)
 #define pcadd(a, b, mask) ((((a) ^ (b)) + (((a) & (b) & (mask)) << 1)) & 0xff)
FPGA/ASIC-unfriendly
Sequential memory-hard functions

All of the friendliness examples in this and previous slides assume that sufficient parallelism is available in one instance of a KDF, as suggested before