fix byte48 type required in prover

Signed-off-by: noelwei <[email protected]>

Author: noel2004

common/types/message/message.go

@@ -53,15 +53,35 @@ type EuclidV2ChunkTaskDetail struct {
 	PrevMsgQueueHash common.Hash   `json:"prev_msg_queue_hash"`
 }
 
+// it is a hex encoded big with fixed length on 48 bytes
+type Byte48 struct {
+	hexutil.Big
+}
+
+func (e Byte48) MarshalText() ([]byte, error) {
+	i := e.ToInt()
+	// overrite encode big
+	if sign := i.Sign(); sign < 0 {
+		// sanity check
+		return nil, fmt.Errorf("Byte48 must be positive integer")
+	} else {
+		s := i.Text(16)
+		if len(s) > 96 {
+			return nil, fmt.Errorf("Integer Exceed 384bit")
+		}
+		return []byte(fmt.Sprintf("0x%0*s", 96, s)), nil
+	}
+}
+
 // BatchTaskDetail is a type containing BatchTask detail.
 type BatchTaskDetail struct {
 	ChunkInfos      []*ChunkInfo `json:"chunk_infos"`
 	ChunkProofs     []ChunkProof `json:"chunk_proofs"`
 	BatchHeader     interface{}  `json:"batch_header"`
 	BlobBytes       []byte       `json:"blob_bytes"`
-	KzgProof        hexutil.Big  `json:"kzg_proof"`
-	KzgCommitment   hexutil.Big  `json:"kzg_commitment"`
-	ChallengeDigest hexutil.Big  `json:"challenge_digest"`
+	KzgProof        Byte48       `json:"kzg_proof"`
+	KzgCommitment   Byte48       `json:"kzg_commitment"`
+	ChallengeDigest Byte48       `json:"challenge_digest"`
 }
 
 // BundleTaskDetail consists of all the information required to describe the task to generate a proof for a bundle of batches.

common/types/message/message_test.go

@@ -0,0 +1,22 @@
+package message
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestBytes48(t *testing.T) {
+	ti := &Byte48{}
+	ti.UnmarshalText([]byte("0x1"))
+	if s, err := ti.MarshalText(); err == nil {
+		if len(s) != 98 {
+			panic(fmt.Sprintf("wrong str: %s", s))
+		}
+	}
+	ti.UnmarshalText([]byte("0x0"))
+	if s, err := ti.MarshalText(); err == nil {
+		if len(s) != 98 {
+			panic(fmt.Sprintf("wrong str: %s", s))
+		}
+	}
+}