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feat(node-api): proof of proposer index in beacon block (#2099)
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82 changes: 82 additions & 0 deletions
82
mod/node-api/handlers/proof/merkle/block_proposer_index.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| // SPDX-License-Identifier: BUSL-1.1 | ||
| // | ||
| // Copyright (C) 2024, Berachain Foundation. All rights reserved. | ||
| // Use of this software is governed by the Business Source License included | ||
| // in the LICENSE file of this repository and at www.mariadb.com/bsl11. | ||
| // | ||
| // ANY USE OF THE LICENSED WORK IN VIOLATION OF THIS LICENSE WILL AUTOMATICALLY | ||
| // TERMINATE YOUR RIGHTS UNDER THIS LICENSE FOR THE CURRENT AND ALL OTHER | ||
| // VERSIONS OF THE LICENSED WORK. | ||
| // | ||
| // THIS LICENSE DOES NOT GRANT YOU ANY RIGHT IN ANY TRADEMARK OR LOGO OF | ||
| // LICENSOR OR ITS AFFILIATES (PROVIDED THAT YOU MAY USE A TRADEMARK OR LOGO OF | ||
| // LICENSOR AS EXPRESSLY REQUIRED BY THIS LICENSE). | ||
| // | ||
| // TO THE EXTENT PERMITTED BY APPLICABLE LAW, THE LICENSED WORK IS PROVIDED ON | ||
| // AN “AS IS” BASIS. LICENSOR HEREBY DISCLAIMS ALL WARRANTIES AND CONDITIONS, | ||
| // EXPRESS OR IMPLIED, INCLUDING (WITHOUT LIMITATION) WARRANTIES OF | ||
| // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, AND | ||
| // TITLE. | ||
|
|
||
| package merkle | ||
|
|
||
| import ( | ||
| "github.com/berachain/beacon-kit/mod/errors" | ||
| "github.com/berachain/beacon-kit/mod/node-api/handlers/proof/types" | ||
| "github.com/berachain/beacon-kit/mod/primitives/pkg/common" | ||
| "github.com/berachain/beacon-kit/mod/primitives/pkg/encoding/ssz/merkle" | ||
| ) | ||
|
|
||
| // ProveProposerIndexInBlock generates a proof for the proposer index in the | ||
| // beacon block. The proof is then verified against the beacon block root as a | ||
| // sanity check. Returns the proof along with the beacon block root. It uses | ||
| // the fastssz library to generate the proof. | ||
| func ProveProposerIndexInBlock[ | ||
| BeaconBlockHeaderT types.BeaconBlockHeader, | ||
| ](bbh BeaconBlockHeaderT) ([]common.Root, common.Root, error) { | ||
| blockProofTree, err := bbh.GetTree() | ||
| if err != nil { | ||
| return nil, common.Root{}, err | ||
| } | ||
|
|
||
| proposerIndexProof, err := blockProofTree.Prove( | ||
| ProposerIndexGIndexDenebBlock, | ||
| ) | ||
| if err != nil { | ||
| return nil, common.Root{}, err | ||
| } | ||
|
|
||
| proof := make([]common.Root, len(proposerIndexProof.Hashes)) | ||
| for i, hash := range proposerIndexProof.Hashes { | ||
| proof[i] = common.NewRootFromBytes(hash) | ||
| } | ||
|
|
||
| beaconRoot, err := verifyProposerIndexInBlock( | ||
| bbh, proof, common.NewRootFromBytes(proposerIndexProof.Leaf), | ||
| ) | ||
| if err != nil { | ||
| return nil, common.Root{}, err | ||
| } | ||
|
|
||
| return proof, beaconRoot, nil | ||
| } | ||
|
|
||
| // verifyProposerIndexInBlock verifies the proposer index proof in the block. | ||
| // | ||
| // TODO: verifying the proof is not absolutely necessary. | ||
| func verifyProposerIndexInBlock( | ||
| bbh types.BeaconBlockHeader, proof []common.Root, leaf common.Root, | ||
| ) (common.Root, error) { | ||
| beaconRoot := bbh.HashTreeRoot() | ||
| if beaconRootVerified, err := merkle.VerifyProof( | ||
| ProposerIndexGIndexDenebBlock, leaf, proof, beaconRoot, | ||
| ); err != nil { | ||
| return common.Root{}, err | ||
| } else if !beaconRootVerified { | ||
| return common.Root{}, errors.New( | ||
| "proposer index proof failed to verify against beacon root", | ||
| ) | ||
| } | ||
|
|
||
| return beaconRoot, nil | ||
| } |
84 changes: 84 additions & 0 deletions
84
mod/node-api/handlers/proof/merkle/block_proposer_index_test.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| // SPDX-License-Identifier: BUSL-1.1 | ||
| // | ||
| // Copyright (C) 2024, Berachain Foundation. All rights reserved. | ||
| // Use of this software is governed by the Business Source License included | ||
| // in the LICENSE file of this repository and at www.mariadb.com/bsl11. | ||
| // | ||
| // ANY USE OF THE LICENSED WORK IN VIOLATION OF THIS LICENSE WILL AUTOMATICALLY | ||
| // TERMINATE YOUR RIGHTS UNDER THIS LICENSE FOR THE CURRENT AND ALL OTHER | ||
| // VERSIONS OF THE LICENSED WORK. | ||
| // | ||
| // THIS LICENSE DOES NOT GRANT YOU ANY RIGHT IN ANY TRADEMARK OR LOGO OF | ||
| // LICENSOR OR ITS AFFILIATES (PROVIDED THAT YOU MAY USE A TRADEMARK OR LOGO OF | ||
| // LICENSOR AS EXPRESSLY REQUIRED BY THIS LICENSE). | ||
| // | ||
| // TO THE EXTENT PERMITTED BY APPLICABLE LAW, THE LICENSED WORK IS PROVIDED ON | ||
| // AN “AS IS” BASIS. LICENSOR HEREBY DISCLAIMS ALL WARRANTIES AND CONDITIONS, | ||
| // EXPRESS OR IMPLIED, INCLUDING (WITHOUT LIMITATION) WARRANTIES OF | ||
| // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, AND | ||
| // TITLE. | ||
|
|
||
| package merkle_test | ||
|
|
||
| import ( | ||
| "testing" | ||
|
|
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| "github.com/berachain/beacon-kit/mod/consensus-types/pkg/types" | ||
| "github.com/berachain/beacon-kit/mod/node-api/handlers/proof/merkle" | ||
| "github.com/berachain/beacon-kit/mod/primitives/pkg/common" | ||
| "github.com/berachain/beacon-kit/mod/primitives/pkg/math" | ||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
||
| // TestBlockProposerIndexProof tests the ProveProposerIndexInBlock function | ||
| // and that the generated proof correctly verifies. | ||
| func TestBlockProposerIndexProof(t *testing.T) { | ||
| testCases := []struct { | ||
| name string | ||
| slot math.Slot | ||
| proposerIndex math.ValidatorIndex | ||
| parentBlockRoot common.Root | ||
| stateRoot common.Root | ||
| bodyRoot common.Root | ||
| expectedProofFile string | ||
| }{ | ||
| { | ||
| name: "1 Validator Set", | ||
| slot: 69, | ||
| proposerIndex: 0, | ||
| parentBlockRoot: common.Root{1, 2, 3}, | ||
| stateRoot: common.Root{4, 5, 6}, | ||
| bodyRoot: common.Root{7, 8, 9}, | ||
| expectedProofFile: "one_validator_proposer_index_proof.json", | ||
| }, | ||
| { | ||
| name: "Many Validator Set", | ||
| slot: 420, | ||
| proposerIndex: 69, | ||
| parentBlockRoot: common.Root{1, 2, 3}, | ||
| stateRoot: common.Root{4, 5, 6}, | ||
| bodyRoot: common.Root{7, 8, 9}, | ||
| expectedProofFile: "many_validators_proposer_index_proof.json", | ||
| }, | ||
| } | ||
|
|
||
| for _, tc := range testCases { | ||
| t.Run(tc.name, func(t *testing.T) { | ||
| bbh := (&types.BeaconBlockHeader{}).New( | ||
| tc.slot, | ||
| tc.proposerIndex, | ||
| tc.parentBlockRoot, | ||
| tc.stateRoot, | ||
| tc.bodyRoot, | ||
| ) | ||
|
|
||
| proof, beaconRoot, err := merkle.ProveProposerIndexInBlock(bbh) | ||
| require.NoError(t, err) | ||
|
|
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| require.Equal(t, bbh.HashTreeRoot(), beaconRoot) | ||
|
|
||
| expectedProof := ReadProofFromFile(t, tc.expectedProofFile) | ||
| require.Equal(t, expectedProof, proof) | ||
| }) | ||
| } | ||
| } |
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