feat: add l2 block utilities

l1-contracts/src/core/Decoder.sol

@@ -58,6 +58,7 @@ pragma solidity >=0.8.18;
  *  | 0x22c + x + y + z        | 0x04       | len(l1ToL2Messages) denoted w
  *  | 0x230 + x + y + z        | w          | l1ToL2Messages
  *  |---                       |---         | ---
+ * TODO(rebase): update unknown values - they are not insync
  * TODO: a,b,c,d are number of elements and not bytes, need to be multiplied by the length of the elements.
  */
 contract Decoder {

yarn-project/types/src/l2_block.ts

@@ -281,14 +281,18 @@ export class L2Block {
       this.startTreeOfHistoricPrivateDataTreeRootsSnapshot,
       this.startTreeOfHistoricContractTreeRootsSnapshot,
       this.startPublicDataTreeRoot,
+      this.startL1ToL2MessageTreeSnapshot,
+      this.startTreeOfHistoricL1ToL2MessageTreeRootsSnapshot,
       this.endPrivateDataTreeSnapshot,
       this.endNullifierTreeSnapshot,
       this.endContractTreeSnapshot,
       this.endTreeOfHistoricPrivateDataTreeRootsSnapshot,
       this.endTreeOfHistoricContractTreeRootsSnapshot,
       this.endPublicDataTreeRoot,
-      // TODO(sean rebase): make sure getMessagesHash is included in here too!
+      this.endL1ToL2MessageTreeSnapshot,
+      this.endTreeOfHistoricL1ToL2MessageTreeRootsSnapshot,
       this.getCalldataHash(),
+      this.getL1ToL2MessagesHash(),
     );
     const temp = toBigIntBE(sha256(buf));
     // Prime order of BN254 curve
@@ -308,6 +312,8 @@ export class L2Block {
       this.startContractTreeSnapshot,
       this.startTreeOfHistoricPrivateDataTreeRootsSnapshot,
       this.startTreeOfHistoricContractTreeRootsSnapshot,
+      this.startL1ToL2MessageTreeSnapshot,
+      this.startTreeOfHistoricL1ToL2MessageTreeRootsSnapshot,
       this.startPublicDataTreeRoot,
     );
     return sha256(inputValue);
@@ -325,6 +331,8 @@ export class L2Block {
       this.endContractTreeSnapshot,
       this.endTreeOfHistoricPrivateDataTreeRootsSnapshot,
       this.endTreeOfHistoricContractTreeRootsSnapshot,
+      this.endL1ToL2MessageTreeSnapshot,
+      this.endTreeOfHistoricL1ToL2MessageTreeRootsSnapshot,
       this.endPublicDataTreeRoot,
     );
     return sha256(inputValue);
@@ -394,6 +402,17 @@ export class L2Block {
     return computeRoot(leafs);
   }
 
+  /**
+   * Compute the hash of all of this blocks l1 to l2 messages,
+   * The hash is also calculated within the contract when the block is submitted
+   * @returns
+   */
+  getL1ToL2MessagesHash() {
+    // Create a long buffer of all of the l1 to l2 messages
+    const l1ToL2Messages = Buffer.concat(this.newL1ToL2Messages.map(message => message.toBuffer()));
+    return sha256(l1ToL2Messages);
+  }
+
   /**
    * Get the ith transaction in an L2 block.
    * @param txIndex - The index of the tx in the block.