Submit proof as field elements, not bytes

contracts/Marketplace.sol

@@ -100,7 +100,7 @@ contract Marketplace is Proofs, StateRetrieval {
   function fillSlot(
     RequestId requestId,
     uint256 slotIndex,
-    bytes calldata proof
+    uint256[8] calldata proof
   ) public requestIsKnown(requestId) {
     Request storage request = _requests[requestId];
     require(slotIndex < request.ask.slots, "Invalid slot");

contracts/Proofs.sol

@@ -108,20 +108,19 @@ abstract contract Proofs is Periods {
     return isRequired && pointer < _config.downtime;
   }
 
-  function submitProof(SlotId id, bytes calldata proof) public {
+  function submitProof(SlotId id, uint256[8] calldata proof) public {
     require(!_received[id][_blockPeriod()], "Proof already submitted");
-    require(proof.length == 256, "invalid proof length");
     uint256[2] memory a;
     uint256[2][2] memory b;
     uint256[2] memory c;
-    a[0] = uint256(bytes32(proof[0:32]));
-    a[1] = uint256(bytes32(proof[32:64]));
-    b[0][0] = uint256(bytes32(proof[64:96]));
-    b[0][1] = uint256(bytes32(proof[96:128]));
-    b[1][0] = uint256(bytes32(proof[128:160]));
-    b[1][1] = uint256(bytes32(proof[160:192]));
-    c[0] = uint256(bytes32(proof[192:224]));
-    c[1] = uint256(bytes32(proof[224:256]));
+    a[0] = proof[0];
+    a[1] = proof[1];
+    b[0][0] = proof[2];
+    b[0][1] = proof[3];
+    b[1][0] = proof[4];
+    b[1][1] = proof[5];
+    c[0] = proof[6];
+    c[1] = proof[7];
 
     // TODO: The `pubSignals` should be constructed from information that we already know:
     //  - external entropy (for example some fresh ethereum block header) - this gives us the unbiased randomness we use to sample which cells to prove

test/Marketplace.test.js

@@ -1,9 +1,12 @@
 const { ethers } = require("hardhat")
-const { hexlify, randomBytes } = ethers.utils
 const { AddressZero } = ethers.constants
 const { BigNumber } = ethers
 const { expect } = require("chai")
-const { exampleConfiguration, exampleRequest } = require("./examples")
+const {
+  exampleConfiguration,
+  exampleRequest,
+  exampleProof,
+} = require("./examples")
 const { periodic, hours } = require("./time")
 const { requestId, slotId, askToArray } = require("./ids")
 const {
@@ -76,7 +79,7 @@ describe("Marketplace constructor", function () {
 })
 
 describe("Marketplace", function () {
-  const proof = hexlify(randomBytes(256))
+  const proof = exampleProof()
   const config = exampleConfiguration()
 
   let marketplace

test/examples.js

@@ -39,4 +39,6 @@ const exampleRequest = async () => {
   }
 }
 
-module.exports = { exampleConfiguration, exampleRequest }
+const exampleProof = () => ([1, 2, 3, 4, 5, 6, 7, 8])
+
+module.exports = { exampleConfiguration, exampleRequest, exampleProof }

test/proof.js

@@ -1,40 +1,34 @@
 const fs = require("fs")
 const ethers = require("ethers")
-const { arrayify, concat } = ethers.utils
 const { BigNumber } = ethers
 
 const BASE_PATH = __dirname + "/../verifier/networks"
 const PROOF_FILE_NAME = "example-proof/proof.json"
 
-function decimalToBytes(decimal) {
-  return arrayify(BigNumber.from(decimal).toHexString())
+function G1ToUInts(point) {
+  return [
+    point[0],
+    point[1]
+  ]
 }
 
-function G1ToBytes(point) {
-  return concat([
-    decimalToBytes(point[0]),
-    decimalToBytes(point[1])
-  ])
-}
-
-function G2ToBytes(point) {
-  return concat([
-    decimalToBytes(point[0][1]),
-    decimalToBytes(point[0][0]),
-    decimalToBytes(point[1][1]),
-    decimalToBytes(point[1][0])
-  ])
+function G2ToUInts(point) {
+  return [
+    point[0][1],
+    point[0][0],
+    point[1][1],
+    point[1][0]
+  ]
 }
 
 function loadProof(name) {
   const proof = JSON.parse(
     fs.readFileSync(`${BASE_PATH}/${name}/${PROOF_FILE_NAME}`)
   )
-  return concat([
-    G1ToBytes(proof['pi_a']),
-    G2ToBytes(proof['pi_b']),
-    G1ToBytes(proof['pi_c'])
-  ])
+  return []
+    .concat(G1ToUInts(proof['pi_a']))
+    .concat(G2ToUInts(proof['pi_b']))
+    .concat(G1ToUInts(proof['pi_c']))
 }
 
 module.exports = { loadProof }