Adopt latest changes to requests hash computation (#2862)

* Adopt latest changes to requests hash computation

* Fix test vector

nimbus/common/chain_config_hash.nim

@@ -1,5 +1,5 @@
 # Nimbus
-# Copyright (c) 2021-2024 Status Research & Development GmbH
+# Copyright (c) 2024 Status Research & Development GmbH
 # Licensed under either of
 #  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
 #  * MIT license ([LICENSE-MIT](LICENSE-MIT))

nimbus/common/genesis.nim

@@ -16,6 +16,7 @@ import
   eth/common/[hashes, accounts, headers, addresses],
   ../db/[ledger, core_db],
   ../constants,
+  ../utils/utils,
   ./chain_config
 
 # ------------------------------------------------------------------------------
@@ -78,6 +79,10 @@ proc toGenesisHeader*(
     result.excessBlobGas         = Opt.some g.excessBlobGas.get(0'u64)
     result.parentBeaconBlockRoot = Opt.some g.parentBeaconBlockRoot.get(default(Hash32))
 
+  if fork >= Prague:
+    const EmptyRequestsHash = calcRequestsHash()
+    result.requestsHash = Opt.some(EmptyRequestsHash)
+    
 proc toGenesisHeader*(
     genesis: Genesis;
     fork: HardFork;

nimbus/utils/utils.nim

@@ -40,6 +40,7 @@ func calcRequestsHash*(requests: varargs[seq[byte]]): Hash32 =
   var ctx: sha256
   ctx.init()
   for i, data in requests:
+    if data.len > 0:
       ctx.update(calcHash(i.byte, data).data)
   ctx.finish(result.data)
   ctx.clear()

tests/engine_api/newPayloadV4_invalid_blockhash.json

@@ -2,7 +2,7 @@
     "payload": {
       "baseFeePerGas": "0x7",
       "blobGasUsed": "0x40000",
-      "blockHash": "0x187307d7dc9beb87af2a1d8340e9f17a3bbe4738963daeaf6d8e13b27b2d6a7f",
+      "blockHash": "0x2ad74d1c5c12bcdedbdc821ae5d18f44e732b4096b6496a23bd9483d202003c5",
       "blockNumber": "0x94b2",
       "excessBlobGas": "0x0",
       "extraData": "0xd883010e0c846765746888676f312e32332e32856c696e7578",

tests/test_genesis.nim

@@ -12,7 +12,8 @@ import
   std/[os],
   unittest2,
   ../nimbus/config,
-  ../nimbus/common/common
+  ../nimbus/common/common,
+  ../nimbus/utils/utils
 
 const
   baseDir = [".", "tests", ".."/"tests", $DirSep]  # path containg repo
@@ -132,6 +133,21 @@ proc customGenesisTest() =
       check com.genesisHeader.blockHash == genesisHash
       check com.chainId == 17000.ChainId
 
+    test "Prague genesis":
+      # pre Prague
+      var cg: NetworkParams
+      check loadNetworkParams("mekong.json".findFilePath, cg)
+      var com = CommonRef.new(newCoreDbRef DefaultDbMemory, params = cg)
+      check com.genesisHeader.requestsHash.isNone
+
+      # post prague
+      const EmptyRequestsHash = hash32"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
+      check loadNetworkParams("prague.json".findFilePath, cg)
+      com = CommonRef.new(newCoreDbRef DefaultDbMemory, params = cg)
+      check com.genesisHeader.requestsHash.isSome
+      check com.genesisHeader.requestsHash.get == EmptyRequestsHash
+      check calcRequestsHash(default(seq[byte]), default(seq[byte]), default(seq[byte])) == EmptyRequestsHash
+
 proc genesisMain*() =
   genesisTest()
   customGenesisTest()

tools/t8n/testdata/00-525/exp1.json

@@ -18,7 +18,7 @@
     "withdrawalsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
     "currentExcessBlobGas": "0x2b80000",
     "blobGasUsed": "0x0",
-    "requestsHash": "0x6036c41849da9c076ed79654d434017387a88fb833c2856b32e18218b3341c5f",
+    "requestsHash": "0xe3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
     "requests": [
       "0x",
       "0x",

tools/t8n/testdata/00-525/exp2.json

@@ -34,7 +34,7 @@
     "withdrawalsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
     "currentExcessBlobGas": "0x2b80000",
     "blobGasUsed": "0x0",
-    "requestsHash": "0x6036c41849da9c076ed79654d434017387a88fb833c2856b32e18218b3341c5f",
+    "requestsHash": "0xe3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
     "requests": [
       "0x",
       "0x",

tools/t8n/testdata/00-525/exp3.json

@@ -34,7 +34,7 @@
     "withdrawalsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
     "currentExcessBlobGas": "0x2b80000",
     "blobGasUsed": "0x0",
-    "requestsHash": "0xa5c19ed76c01fe25a67b7ef8c227caa34951e8c7e74168408b5be0861dac686d",
+    "requestsHash": "0xf34c7b46f404c6c6f91b540c098b6dfe3f59b7e50ad155807c8c7d2221e52241",
     "requests": [
       "0x81521c60874daf5b425c21e44caf045c4d475e8b33a557a28cee3c46ef9cf9bd95b4c75a0bb629981b40d0102452dd4c020000000000000000000000332e43696a505ef45b9319973785f837ce5267b9000065cd1d0000008c8f2647f342d2c3e8fd07c6b3b9b16383ac11c4be6a6962c7fc18a789daee5fac20ee0bbe4a10383759aaffacacb72b0d67f998730cdf4995fe73afe434dfce2803b343606f67fc4995597c0af9e0fe9ed00006e5889bec29171f670e7d9be20000000000000000",
       "0x",