From f665f7dbab88e0689719dc08400f8acf8af20ed7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=BCrgen=20Gamenik?= <mixgenest@gmx.de>
Date: Sun, 15 Mar 2026 07:35:34 +0100
Subject: [PATCH] crypto/kzg4844: List semantic for CalcBlobHAshV1

---
 core/types/tx_blob.go               | 14 +++++---------
 crypto/kzg4844/kzg4844.go           | 10 ++++++++++
 eth/catalyst/simulated_beacon.go    | 11 ++++++-----
 internal/ethapi/transaction_args.go |  6 +-----
 signer/core/apitypes/types.go       |  6 +-----
 5 files changed, 23 insertions(+), 24 deletions(-)

diff --git a/core/types/tx_blob.go b/core/types/tx_blob.go
index 31aadb5419..430e7177f2 100644
--- a/core/types/tx_blob.go
+++ b/core/types/tx_blob.go
@@ -18,7 +18,6 @@ package types
 
 import (
 	"bytes"
-	"crypto/sha256"
 	"errors"
 	"fmt"
 	"math/big"
@@ -87,11 +86,8 @@ func NewBlobTxSidecar(version byte, blobs []kzg4844.Blob, commitments []kzg4844.
 
 // BlobHashes computes the blob hashes of the given blobs.
 func (sc *BlobTxSidecar) BlobHashes() []common.Hash {
-	hasher := sha256.New()
 	h := make([]common.Hash, len(sc.Commitments))
-	for i := range sc.Blobs {
-		h[i] = kzg4844.CalcBlobHashV1(hasher, &sc.Commitments[i])
-	}
+	kzg4844.CalcBlobHashV1List(sc.Commitments, h)
 	return h
 }
 
@@ -153,11 +149,11 @@ func (sc *BlobTxSidecar) ValidateBlobCommitmentHashes(hashes []common.Hash) erro
 	if len(sc.Commitments) != len(hashes) {
 		return fmt.Errorf("invalid number of %d blob commitments compared to %d blob hashes", len(sc.Commitments), len(hashes))
 	}
-	hasher := sha256.New()
+	computed := make([]common.Hash, len(sc.Commitments))
+	kzg4844.CalcBlobHashV1List(sc.Commitments, computed)
 	for i, vhash := range hashes {
-		computed := kzg4844.CalcBlobHashV1(hasher, &sc.Commitments[i])
-		if vhash != computed {
-			return fmt.Errorf("blob %d: computed hash %#x mismatches transaction one %#x", i, computed, vhash)
+		if vhash != computed[i] {
+			return fmt.Errorf("blob %d: computed hash %#x mismatches transaction one %#x", i, computed[i], vhash)
 		}
 	}
 	return nil
diff --git a/crypto/kzg4844/kzg4844.go b/crypto/kzg4844/kzg4844.go
index 3ccc204838..49e969e382 100644
--- a/crypto/kzg4844/kzg4844.go
+++ b/crypto/kzg4844/kzg4844.go
@@ -18,12 +18,14 @@
 package kzg4844
 
 import (
+	"crypto/sha256"
 	"embed"
 	"errors"
 	"hash"
 	"reflect"
 	"sync/atomic"
 
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
 )
 
@@ -185,6 +187,14 @@ func CalcBlobHashV1(hasher hash.Hash, commit *Commitment) (vh [32]byte) {
 	return vh
 }
 
+// Hashes List of commitments
+func CalcBlobHashV1List(list []Commitment, hashes []common.Hash) {
+	hasher := sha256.New()
+	for nr, commit := range list {
+		hashes[nr] = CalcBlobHashV1(hasher, &commit)
+	}
+}
+
 // IsValidVersionedHash checks that h is a structurally-valid versioned blob hash.
 func IsValidVersionedHash(h []byte) bool {
 	return len(h) == 32 && h[0] == 0x01
diff --git a/eth/catalyst/simulated_beacon.go b/eth/catalyst/simulated_beacon.go
index 452902c78c..78048d81a3 100644
--- a/eth/catalyst/simulated_beacon.go
+++ b/eth/catalyst/simulated_beacon.go
@@ -19,7 +19,6 @@ package catalyst
 import (
 	"context"
 	"crypto/rand"
-	"crypto/sha256"
 	"errors"
 	"fmt"
 	"math"
@@ -253,15 +252,17 @@ func (c *SimulatedBeacon) sealBlock(withdrawals []*types.Withdrawal, timestamp u
 		// Independently calculate the blob hashes from sidecars.
 		blobHashes = make([]common.Hash, 0)
 		if envelope.BlobsBundle != nil {
-			hasher := sha256.New()
-			for _, commit := range envelope.BlobsBundle.Commitments {
+			blobHashes = make([]common.Hash, len(envelope.BlobsBundle.Commitments))
+			commits := make([]kzg4844.Commitment, len(envelope.BlobsBundle.Commitments))
+			for nr, commit := range envelope.BlobsBundle.Commitments {
 				var c kzg4844.Commitment
 				if len(commit) != len(c) {
 					return errors.New("invalid commitment length")
 				}
-				copy(c[:], commit)
-				blobHashes = append(blobHashes, kzg4844.CalcBlobHashV1(hasher, &c))
+				copy(commits[nr][:], commit)
 			}
+
+			kzg4844.CalcBlobHashV1List(commits, blobHashes)
 		}
 		beaconRoot = &common.Hash{}
 		requests = envelope.Requests
diff --git a/internal/ethapi/transaction_args.go b/internal/ethapi/transaction_args.go
index 4fb30e6289..3cb13a85d7 100644
--- a/internal/ethapi/transaction_args.go
+++ b/internal/ethapi/transaction_args.go
@@ -19,7 +19,6 @@ package ethapi
 import (
 	"bytes"
 	"context"
-	"crypto/sha256"
 	"errors"
 	"fmt"
 	"math"
@@ -371,10 +370,7 @@ func (args *TransactionArgs) setBlobTxSidecar(ctx context.Context, config sideca
 
 	// Generate blob hashes if they are missing, or validate them if they are provided.
 	hashes := make([]common.Hash, n)
-	hasher := sha256.New()
-	for i, c := range args.Commitments {
-		hashes[i] = kzg4844.CalcBlobHashV1(hasher, &c)
-	}
+	kzg4844.CalcBlobHashV1List(args.Commitments, hashes)
 	if args.BlobHashes != nil {
 		for i, h := range hashes {
 			if h != args.BlobHashes[i] {
diff --git a/signer/core/apitypes/types.go b/signer/core/apitypes/types.go
index 401f4fba07..5a50cbf421 100644
--- a/signer/core/apitypes/types.go
+++ b/signer/core/apitypes/types.go
@@ -18,7 +18,6 @@ package apitypes
 
 import (
 	"bytes"
-	"crypto/sha256"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -291,10 +290,7 @@ func (args *SendTxArgs) validateTxSidecar() error {
 	}
 
 	hashes := make([]common.Hash, n)
-	hasher := sha256.New()
-	for i, c := range args.Commitments {
-		hashes[i] = kzg4844.CalcBlobHashV1(hasher, &c)
-	}
+	kzg4844.CalcBlobHashV1List(args.Commitments, hashes)
 	if args.BlobHashes != nil {
 		for i, h := range hashes {
 			if h != args.BlobHashes[i] {