register.cairo

func register_voter{
        syscall_ptr : felt*, range_check_ptr, pedersen_ptr : HashBuiltin*,
        ecdsa_ptr : SignatureBuiltin*}(poll_id : felt, voter_public_key : felt, r : felt, s : felt):
    let (owner_pubkey) = poll_owner_public_key.read(poll_id=poll_id)
    # verify valid poll
    assert_not_zero(owner_pubkey)

    # verify signature
    let (message) = hash2{hash_ptr=pedersen_ptr}(x=poll_id, y=voter_public_key)
    verify_ecdsa_signature(message=message, public_key=owner_pubkey, signature_r=r, signature_s=s)