add sequencer sig verifier tests

contracts/libs/ReceiptParser.sol

@@ -41,6 +41,14 @@ struct Ics23Proof {
     uint256 height;
 }
 
+// This is the proof we use to verify the apphash (state) updates.
+struct OpL2StateProof {
+    bytes[] accountProof;
+    bytes[] outputRootProof;
+    bytes32 l2OutputProposalKey;
+    bytes32 l2BlockHash;
+}
+
 /**
  * A library for helpers for proving peptide state
  */

test/PolymerProofLib.t.sol

@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.0;
+
+import "forge-std/Test.sol";
+
+contract PolymerProofLibTest is Test {}

test/SequencerVerifier.t.sol

@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.0;
+
+import "forge-std/Test.sol";
+import "./utils/Signing.base.t.sol";
+
+contract SequencerProofVerifierStateUpdate is SigningBase {
+    function test_verify_signature_state_update_sucess() public view {
+        (uint8 v, bytes32 r, bytes32 s) = vm.sign(sequencerPkey, hashToSign);
+
+        bytes memory signature = abi.encodePacked(r, s, v); // Annoyingly, v, r, s are in a different order than those
+            // returned from vm.sign
+
+        // This call should not revert as long as it's a valid sequencer signature
+        sigVerifier.verifyStateUpdate(peptideBlockNumber, peptideAppHash, l1BlockHash, signature);
+    }
+
+    // Call should revert if invalid signature values are passed
+    function test_verify_state_update_invalid_signature() public {
+        (uint8 v, bytes32 r, bytes32 s) = vm.sign(sequencerPkey, hashToSign);
+
+        bytes memory signatureTooShort = abi.encodePacked(r, s);
+        bytes memory signatureTooLong = abi.encodePacked(r, s, v, uint256(123));
+
+        // This call should not revert as long as it's a valid sequencer signature
+        vm.expectRevert("ECDSA: invalid signature length");
+        sigVerifier.verifyStateUpdate(peptideBlockNumber, peptideAppHash, l1BlockHash, signatureTooShort);
+        vm.expectRevert("ECDSA: invalid signature length");
+        sigVerifier.verifyStateUpdate(peptideBlockNumber, peptideAppHash, l1BlockHash, signatureTooLong);
+    }
+
+    // Valid signature but from the wrong signer should revert
+    function test_verify_state_update_not_signer() public {
+        (, uint256 notSequencerPkey) = makeAddrAndKey(unicode"😳");
+        (uint8 v, bytes32 r, bytes32 s) = vm.sign(notSequencerPkey, hashToSign);
+
+        bytes memory wrongSignerSignature = abi.encodePacked(r, s, v);
+
+        vm.expectRevert(abi.encodeWithSelector(ISignatureVerifier.InvalidSequencerSignature.selector));
+        sigVerifier.verifyStateUpdate(peptideBlockNumber, peptideAppHash, l1BlockHash, wrongSignerSignature);
+    }
+
+    // Valid signature but on the wrong header should revert
+    function test_verify_state_update_incorrect_header() public {
+        (uint8 v, bytes32 r, bytes32 s) = vm.sign(sequencerPkey, hashToSign);
+
+        bytes memory signature = abi.encodePacked(r, s, v);
+
+        vm.expectRevert(abi.encodeWithSelector(ISignatureVerifier.InvalidSequencerSignature.selector));
+        sigVerifier.verifyStateUpdate(peptideBlockNumber + 1, peptideAppHash, l1BlockHash, signature);
+    }
+}

test/payload/l1_block_0x4df537.hex

@@ -0,0 +1 @@
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

test/payload/l2_block_0x4b0.json

@@ -0,0 +1,21 @@
+{
+	"jsonrpc": "2.0",
+	"id": "1",
+	"result": {
+		"baseFeePerGas": "0x0",
+		"difficulty": "0x0",
+		"extraData": "",
+		"gasLimit": "0x1c9c380",
+		"gasUsed": "0x0",
+		"hash": "0xf51d6bb7b2578b14d98849963eab7433110e4ad7fdac1636d03bcc9f9a852721",
+		"logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+		"mixHash": "0x13368de1a039f35df18b6363569284e944460f3e408fabe7ce998c2c5d8f46d0",
+		"number": "0x4b0",
+		"parentHash": "0xb1c7530229b8155c745feaa0da2d9018f3c873fd8e4a8f226a08b8b1c8bc894e",
+		"receiptsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
+		"sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
+		"stateRoot": "0x6cc4ecfce2112e8b6100e023edac48d81f554c1d3869bac8140b0609959586af",
+		"timestamp": "0x657ba6ba",
+		"transactionsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421"
+	}
+}

test/utils/Signing.base.t.sol

@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.0;
+
+import "forge-std/Test.sol";
+import "../../contracts/core/SequencerSignatureVerifier.sol";
+import {RLPWriter} from "optimism/libraries/rlp/RLPWriter.sol";
+import {L1Header} from "../../contracts/interfaces/IAppStateVerifier.sol";
+
+contract SigningBase is Test {
+    using stdJson for string;
+
+    string rootDir = vm.projectRoot();
+
+    bytes32 l1BlockHash;
+    bytes32 peptideAppHash;
+    uint256 public peptideBlockNumber;
+    uint256 public sequencerPkey;
+    uint256 public notSequencerPkey;
+    address public sequencer;
+    bytes32 hashToSign;
+    bytes32 domain; // Domain will be empty so we can leave it as initialized to default 0x 32 bytes
+
+    SequencerSignatureVerifier public sigVerifier;
+    bytes32 PEPTIDE_CHAIN_ID = bytes32(uint256(444));
+
+    L1Header childl1Block; // Child block, represents the l1 origin of dest chain when peptide catches up to ancestor L1
+        // block
+    L1Header ancestorL1Block; // Ancestor block, represents the l1 origin of dest chain when peptide wants to submit a
+
+    // client update but is behind, so we need to checkpoint this block
+
+    constructor() {
+        (sequencer, sequencerPkey) = makeAddrAndKey("alice");
+        (, notSequencerPkey) = makeAddrAndKey(unicode"bob😈");
+        sigVerifier = new SequencerSignatureVerifier(sequencer, PEPTIDE_CHAIN_ID);
+
+        // generate the channel_proof.hex file with the following command:
+        // cd test-data-generator && go run ./cmd/ --type l1 > ../test/payload/l1_block_0x4df537.hex
+        // this is the "rlp" half-encoded header that would be sent by the relayer. this was produced
+        // by the test-data-generator tool.
+        L1Header memory l1header = abi.decode(
+            vm.parseBytes(vm.readFile(string.concat(rootDir, "/test/payload/l1_block_0x4df537.hex"))), (L1Header)
+        );
+
+        l1BlockHash = keccak256(RLPWriter.writeList(l1header.header)); // Blockhash that will be signed by sequencer
+
+        peptideBlockNumber = 101;
+
+        // this happens to be the polymer height when the L2OO was updated with the output proposal
+        // we are using in the test
+        string memory l2BlockJson = vm.readFile(string.concat(rootDir, "/test/payload/l2_block_0x4b0.json"));
+        peptideAppHash = abi.decode(l2BlockJson.parseRaw(".result.stateRoot"), (bytes32));
+
+        bytes32 payloadHash = keccak256(abi.encodePacked(peptideBlockNumber, peptideAppHash, l1BlockHash));
+        hashToSign = keccak256(bytes.concat(domain, PEPTIDE_CHAIN_ID, payloadHash));
+    }
+
+    // Read a specific bytes32 json property from a json file
+    function readBytes32FromJson(string memory fileName, string memory property) public view returns (bytes32) {
+        string memory blockJson = vm.readFile(string.concat(rootDir, fileName));
+        return abi.decode(blockJson.parseRaw(property), (bytes32));
+    }
+
+    // Read a specific uint64 json property from a json file
+    function readUint64FromJson(string memory fileName, string memory property) public view returns (uint64) {
+        string memory blockJson = vm.readFile(string.concat(rootDir, fileName));
+        return abi.decode(blockJson.parseRaw(property), (uint64));
+    }
+}