audit: add G2 subgroup check #35
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manishbista28
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Fixes #5
Cheap subgroup check approach mentioned in:
https://eprint.iacr.org/2022/348.pdf Section 3.1.2 Remark 2
ark_bn254::Config::ATE_LOOP_COUNTis 6z + 2 so the costly part of the computation is done inside the Miller Loop itself while computing G2 accumulator. Outside of the loop, we only have to do an additional Frobenius corresponding to c_3 coefficient of (6z+ 2,1,−1,1).