[privToPubKey.nr] Fixed Base Scalar Mul for BabyJubJub

[nullity00]

Circom File : https://github.com/privacy-scaling-explorations/maci/blob/master/circuits/circom/privToPubKey.circom

To Convert Private key to Public Key, multiply private key with the Base point of the curve i.e. pubKey = privKey * G. This is done using Fixed base Scalar multiplication.

To Do

• [ ] Private key has to be pruned & hashed inside the circuit. Ref: https://github.com/iden3/circomlibjs/blob/main/src/eddsa.js#L29
• [x] Implement Fixed Base Scalar Multiplication (Noir has a std lib with this func : https://noir-lang.org/standard_library/cryptographic_primitives/scalar/#scalar_mulfixed_base )

[nullity00]

@consentsam Any updates ?

[consentsam]

will start this weekend.