Squashed 'bridges/snowbridge/' changes from 6f9cfdd9796..afc668ef634

afc668ef634 Fix penpal smoketest (#1064)
3b3e9c212d3 remove fuzzing out of subtree (#1062)
60ab6cee76f Fix for smoke tests (#1056)
cc17c16bb2c Fix e2e setup (#1061)
4c175e49461 Add CustomDigestItem type (#1053)
09a9253e54a Make base fee configurable from storage. (#1060)
6f14f708282 Audit issue 9: Check if max nonce reached in outbound-queue pallet (#1052)
f7f06d21607 Set gateway on start-up (#1054)
de51fe77b18 Remove obsolete `outbound_fee` parameter from channel governance extrinsics and events (#1051)
455fa0e6458 Bump dependendencies for generating contract bindings (#1049)
99598660e61 Audit issue 6: Use primary governance channel (#1050)

git-subtree-dir: bridges/snowbridge
git-subtree-split: afc668ef634deb0ed6a8e44f7ee75c0c22f80ed1

contracts/src/Verification.sol

@@ -76,6 +76,9 @@ library Verification {
     uint256 public constant DIGEST_ITEM_PRERUNTIME = 6;
     uint256 public constant DIGEST_ITEM_RUNTIME_ENVIRONMENT_UPDATED = 8;
 
+    /// @dev Enum variant ID for CustomDigestItem::Snowbridge
+    bytes1 public constant DIGEST_ITEM_OTHER_SNOWBRIDGE = 0x00;
+
     /// @dev Verify the message commitment by applying several proofs
     ///
     /// 1. First check that the commitment is included in the digest items of the parachain header
@@ -132,8 +135,11 @@ library Verification {
         returns (bool)
     {
         for (uint256 i = 0; i < header.digestItems.length; i++) {
-            DigestItem memory item = header.digestItems[i];
-            if (item.kind == DIGEST_ITEM_OTHER && item.data.length == 32 && commitment == bytes32(item.data)) {
+            if (
+                header.digestItems[i].kind == DIGEST_ITEM_OTHER && header.digestItems[i].data.length == 33
+                    && header.digestItems[i].data[0] == DIGEST_ITEM_OTHER_SNOWBRIDGE
+                    && commitment == bytes32(header.digestItems[i].data[1:])
+            ) {
                 return true;
             }
         }

contracts/test/Verification.t.sol

@@ -88,7 +88,7 @@ contract VerificationTest is Test {
         digestItems[2] = Verification.DigestItem({
             kind: 0,
             consensusEngineID: 0x00000000,
-            data: hex"b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c"
+            data: hex"00b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c"
         });
         digestItems[3] = Verification.DigestItem({
             kind: 5,