Add very initial version of smart contracts with tests

compile-circuits.sh

@@ -0,0 +1,36 @@
+#!/bin/sh
+
+# npm install
+rm -r build
+mkdir build
+cd build
+
+echo $(date +"%T") "circom ../circuits/withdraw.circom --r1cs --wasm --sym"
+itime="$(date -u +%s)"
+../node_modules/.bin/circom ../circuits/withdraw.circom --r1cs --wasm --sym
+ftime="$(date -u +%s)"
+echo "	($(($(date -u +%s)-$itime))s)"
+
+echo $(date +"%T") "snarkjs info -r withdraw.r1cs"
+../node_modules/.bin/snarkjs info -r withdraw.r1cs
+
+echo $(date +"%T") "snarkjs setup"
+itime="$(date -u +%s)"
+../node_modules/.bin/snarkjs setup -r withdraw.r1cs
+echo "	($(($(date -u +%s)-$itime))s)"
+echo $(date +"%T") "trusted setup generated"
+
+# sed -i 's/null/["0","0","0"]/g' proving_key.json
+
+
+echo $(date +"%T") "snarkjs generateverifier"
+itime="$(date -u +%s)"
+../node_modules/.bin/snarkjs generateverifier
+echo "	($(($(date -u +%s)-$itime))s)"
+echo $(date +"%T") "generateverifier generated"
+
+sed -i "s/solidity ^0.5.0/solidity ^0.6.0/g" verifier.sol
+sed -i "s/gas/gas()/g" verifier.sol
+sed -i "s/return the sum/return r the sum/g" verifier.sol
+sed -i "s/return the product/return r the product/g" verifier.sol
+cp verifier.sol ../contracts/verifier.sol