das.go

package dasmon

import (
	"fmt"

	"github.com/OffchainLabs/prysm/v7/beacon-chain/core/peerdas"
	"github.com/OffchainLabs/prysm/v7/consensus-types/blocks"
	eth "github.com/OffchainLabs/prysm/v7/proto/prysm/v1alpha1"
	"github.com/ethereum/go-ethereum/p2p/enode"
)

// verifyDataColumn verifies the cryptographic proofs for a data column sidecar.
// This wraps Prysm's peerdas.VerifyDataColumnSidecar function.
func verifyDataColumn(column *eth.DataColumnSidecar) error {
	col, err := blocks.NewRODataColumn(column)
	if err != nil {
		return fmt.Errorf("failed to create RO data column: %w", err)
	}
	return peerdas.VerifyDataColumnSidecar(col)
}

// verifyInclusionProof verifies the KZG inclusion proof for a data column sidecar.
// This wraps Prysm's peerdas.VerifyDataColumnSidecarInclusionProof function.
func verifyInclusionProof(column *eth.DataColumnSidecar) error {
	col, err := blocks.NewRODataColumn(column)
	if err != nil {
		return fmt.Errorf("failed to create RO data column: %w", err)
	}
	return peerdas.VerifyDataColumnSidecarInclusionProof(col)
}

// computeCustodyGroups calculates the custody groups for a given node.
// This wraps Prysm's peerdas.CustodyGroups function.
//
// Parameters:
//   - nodeID: The Ethereum node ID
//   - totalGroups: Total number of custody groups (typically 128 for PeerDAS)
//
// Returns the list of custody group indices this node is responsible for.
func computeCustodyGroups(id enode.ID, cgc uint64) ([]uint64, error) {
	return peerdas.CustodyGroups(id, cgc)
}