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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| package inclusion | ||
|
|
||
| import ( | ||
| "crypto/sha256" | ||
|
|
||
| "github.com/celestiaorg/celestia-app/pkg/appconsts" | ||
| "github.com/celestiaorg/celestia-app/pkg/blob" | ||
| appns "github.com/celestiaorg/celestia-app/pkg/namespace" | ||
| appshares "github.com/celestiaorg/celestia-app/pkg/shares" | ||
| "github.com/celestiaorg/nmt" | ||
| "github.com/tendermint/tendermint/crypto/merkle" | ||
| ) | ||
|
|
||
| // CreateCommitment generates the share commitment for a given blob. | ||
| // See [data square layout rationale] and [blob share commitment rules]. | ||
| // | ||
| // [data square layout rationale]: ../../specs/src/specs/data_square_layout.md | ||
| // [blob share commitment rules]: ../../specs/src/specs/data_square_layout.md#blob-share-commitment-rules | ||
| func CreateCommitment(blob *blob.Blob) ([]byte, error) { | ||
| if err := blob.Validate(); err != nil { | ||
| return nil, err | ||
| } | ||
| namespace := blob.Namespace() | ||
|
|
||
| shares, err := appshares.SplitBlobs(blob) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // the commitment is the root of a merkle mountain range with max tree size | ||
| // determined by the number of roots required to create a share commitment | ||
| // over that blob. The size of the tree is only increased if the number of | ||
| // subtree roots surpasses a constant threshold. | ||
| subTreeWidth := SubTreeWidth(len(shares), appconsts.DefaultSubtreeRootThreshold) | ||
| treeSizes, err := MerkleMountainRangeSizes(uint64(len(shares)), uint64(subTreeWidth)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| leafSets := make([][][]byte, len(treeSizes)) | ||
| cursor := uint64(0) | ||
| for i, treeSize := range treeSizes { | ||
| leafSets[i] = appshares.ToBytes(shares[cursor : cursor+treeSize]) | ||
| cursor = cursor + treeSize | ||
| } | ||
|
|
||
| // create the commitments by pushing each leaf set onto an nmt | ||
| subTreeRoots := make([][]byte, len(leafSets)) | ||
| for i, set := range leafSets { | ||
| // create the nmt todo(evan) use nmt wrapper | ||
| tree := nmt.New(sha256.New(), nmt.NamespaceIDSize(appns.NamespaceSize), nmt.IgnoreMaxNamespace(true)) | ||
| for _, leaf := range set { | ||
| // the namespace must be added again here even though it is already | ||
| // included in the leaf to ensure that the hash will match that of | ||
| // the nmt wrapper (pkg/wrapper). Each namespace is added to keep | ||
| // the namespace in the share, and therefore the parity data, while | ||
| // also allowing for the manual addition of the parity namespace to | ||
| // the parity data. | ||
| nsLeaf := make([]byte, 0) | ||
| nsLeaf = append(nsLeaf, namespace.Bytes()...) | ||
| nsLeaf = append(nsLeaf, leaf...) | ||
|
|
||
| err = tree.Push(nsLeaf) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| // add the root | ||
| root, err := tree.Root() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| subTreeRoots[i] = root | ||
| } | ||
| return merkle.HashFromByteSlices(subTreeRoots), nil | ||
| } | ||
|
|
||
| func CreateCommitments(blobs []*blob.Blob) ([][]byte, error) { | ||
| commitments := make([][]byte, len(blobs)) | ||
| for i, blob := range blobs { | ||
| commitment, err := CreateCommitment(blob) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| commitments[i] = commitment | ||
| } | ||
| return commitments, nil | ||
| } | ||
|
|
||
| // MerkleMountainRangeSizes returns the sizes (number of leaf nodes) of the | ||
| // trees in a merkle mountain range constructed for a given totalSize and | ||
| // maxTreeSize. | ||
| // | ||
| // https://docs.grin.mw/wiki/chain-state/merkle-mountain-range/ | ||
| // https://github.com/opentimestamps/opentimestamps-server/blob/master/doc/merkle-mountain-range.md | ||
| func MerkleMountainRangeSizes(totalSize, maxTreeSize uint64) ([]uint64, error) { | ||
| var treeSizes []uint64 | ||
|
|
||
| for totalSize != 0 { | ||
| switch { | ||
| case totalSize >= maxTreeSize: | ||
| treeSizes = append(treeSizes, maxTreeSize) | ||
| totalSize = totalSize - maxTreeSize | ||
| case totalSize < maxTreeSize: | ||
| treeSize, err := appshares.RoundDownPowerOfTwo(totalSize) | ||
| if err != nil { | ||
| return treeSizes, err | ||
| } | ||
| treeSizes = append(treeSizes, treeSize) | ||
| totalSize = totalSize - treeSize | ||
| } | ||
| } | ||
|
|
||
| return treeSizes, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| package inclusion_test | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "testing" | ||
|
|
||
| "github.com/celestiaorg/celestia-app/pkg/appconsts" | ||
| "github.com/celestiaorg/celestia-app/pkg/blob" | ||
| "github.com/celestiaorg/celestia-app/pkg/inclusion" | ||
| appns "github.com/celestiaorg/celestia-app/pkg/namespace" | ||
| "github.com/stretchr/testify/assert" | ||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
||
| func Test_MerkleMountainRangeHeights(t *testing.T) { | ||
| type test struct { | ||
| totalSize uint64 | ||
| squareSize uint64 | ||
| expected []uint64 | ||
| } | ||
| tests := []test{ | ||
| { | ||
| totalSize: 11, | ||
| squareSize: 4, | ||
| expected: []uint64{4, 4, 2, 1}, | ||
| }, | ||
| { | ||
| totalSize: 2, | ||
| squareSize: 64, | ||
| expected: []uint64{2}, | ||
| }, | ||
| { | ||
| totalSize: 64, | ||
| squareSize: 8, | ||
| expected: []uint64{8, 8, 8, 8, 8, 8, 8, 8}, | ||
| }, | ||
| // Height | ||
| // 3 x x | ||
| // / \ / \ | ||
| // / \ / \ | ||
| // / \ / \ | ||
| // / \ / \ | ||
| // 2 x x x x | ||
| // / \ / \ / \ / \ | ||
| // 1 x x x x x x x x x | ||
| // / \ / \ / \ / \ / \ / \ / \ / \ / \ | ||
| // 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | ||
| { | ||
| totalSize: 19, | ||
| squareSize: 8, | ||
| expected: []uint64{8, 8, 2, 1}, | ||
| }, | ||
| } | ||
| for _, tt := range tests { | ||
| res, err := inclusion.MerkleMountainRangeSizes(tt.totalSize, tt.squareSize) | ||
| require.NoError(t, err) | ||
| assert.Equal(t, tt.expected, res) | ||
| } | ||
| } | ||
|
|
||
| // TestCreateCommitment will fail if a change is made to share encoding or how | ||
| // the commitment is calculated. If this is the case, the expected commitment | ||
| // bytes will need to be updated. | ||
| func TestCreateCommitment(t *testing.T) { | ||
| ns1 := appns.MustNewV0(bytes.Repeat([]byte{0x1}, appns.NamespaceVersionZeroIDSize)) | ||
|
|
||
| type test struct { | ||
| name string | ||
| namespace appns.Namespace | ||
| blob []byte | ||
| expected []byte | ||
| expectErr bool | ||
| shareVersion uint8 | ||
| } | ||
| tests := []test{ | ||
| { | ||
| name: "blob of 3 shares succeeds", | ||
| namespace: ns1, | ||
| blob: bytes.Repeat([]byte{0xFF}, 3*appconsts.ShareSize), | ||
| expected: []byte{0x3b, 0x9e, 0x78, 0xb6, 0x64, 0x8e, 0xc1, 0xa2, 0x41, 0x92, 0x5b, 0x31, 0xda, 0x2e, 0xcb, 0x50, 0xbf, 0xc6, 0xf4, 0xad, 0x55, 0x2d, 0x32, 0x79, 0x92, 0x8c, 0xa1, 0x3e, 0xbe, 0xba, 0x8c, 0x2b}, | ||
| shareVersion: appconsts.ShareVersionZero, | ||
| }, | ||
| { | ||
| name: "blob with unsupported share version should return error", | ||
| namespace: ns1, | ||
| blob: bytes.Repeat([]byte{0xFF}, 12*appconsts.ShareSize), | ||
| expectErr: true, | ||
| shareVersion: uint8(1), // unsupported share version | ||
| }, | ||
| } | ||
| for _, tt := range tests { | ||
| t.Run(tt.name, func(t *testing.T) { | ||
| blob := &blob.Blob{ | ||
| NamespaceId: tt.namespace.ID, | ||
| Data: tt.blob, | ||
| ShareVersion: uint32(tt.shareVersion), | ||
| NamespaceVersion: uint32(tt.namespace.Version), | ||
| } | ||
| res, err := inclusion.CreateCommitment(blob) | ||
| if tt.expectErr { | ||
| assert.Error(t, err) | ||
| return | ||
| } | ||
| assert.NoError(t, err) | ||
| assert.Equal(t, tt.expected, res) | ||
| }) | ||
| } | ||
| } |
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