/
unblinder.go
63 lines (57 loc) · 2.01 KB
/
unblinder.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
package validator
import (
"bytes"
"github.com/pkg/errors"
consensusblocks "github.com/prysmaticlabs/prysm/v4/consensus-types/blocks"
"github.com/prysmaticlabs/prysm/v4/consensus-types/interfaces"
"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
enginev1 "github.com/prysmaticlabs/prysm/v4/proto/engine/v1"
ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
"github.com/prysmaticlabs/prysm/v4/runtime/version"
)
func unblindBlobsSidecars(block interfaces.SignedBeaconBlock, bundle *enginev1.BlobsBundle) ([]*ethpb.BlobSidecar, error) {
if block.Version() < version.Deneb || bundle == nil {
return nil, nil
}
header, err := block.Header()
if err != nil {
return nil, err
}
body := block.Block().Body()
blockCommitments, err := body.BlobKzgCommitments()
if err != nil {
return nil, err
}
// Ensure there are equal counts of blobs/commitments/proofs.
if len(bundle.KzgCommitments) != len(bundle.Blobs) {
return nil, errors.New("mismatch commitments count")
}
if len(bundle.Proofs) != len(bundle.Blobs) {
return nil, errors.New("mismatch proofs count")
}
// Verify that commitments in the bundle match the block.
if len(bundle.KzgCommitments) != len(blockCommitments) {
return nil, errors.New("commitment count doesn't match block")
}
for i, commitment := range blockCommitments {
if !bytes.Equal(bundle.KzgCommitments[i], commitment) {
return nil, errors.New("commitment value doesn't match block")
}
}
sidecars := make([]*ethpb.BlobSidecar, len(bundle.Blobs))
for i, b := range bundle.Blobs {
proof, err := consensusblocks.MerkleProofKZGCommitment(body, i)
if err != nil {
return nil, err
}
sidecars[i] = ðpb.BlobSidecar{
Index: uint64(i),
Blob: bytesutil.SafeCopyBytes(b),
KzgCommitment: bytesutil.SafeCopyBytes(bundle.KzgCommitments[i]),
KzgProof: bytesutil.SafeCopyBytes(bundle.Proofs[i]),
SignedBlockHeader: header,
CommitmentInclusionProof: proof,
}
}
return sidecars, nil
}