/// <summary>
/// Check if ``data_1`` and ``data_2`` are slashable according to Casper FFG rules.
/// </summary>
public bool IsSlashableAttestationData(AttestationData data1, AttestationData data2)
{
bool isDoubleVote = data1.Target.Epoch == data2.Target.Epoch && !data1.Equals(data2);
bool isSurroundVote = data1.Source.Epoch < data2.Source.Epoch && data2.Target.Epoch < data1.Target.Epoch;
bool isSlashable = isDoubleVote || isSurroundVote;
return(isSlashable);
}
/// <summary>
/// Return the set of attesting indices corresponding to ``data`` and ``bits``.
/// </summary>
public IReadOnlyList <ValidatorIndex> GetAttestingIndices(BeaconState state, AttestationData data, BitArray bits)
{
IReadOnlyList <ValidatorIndex> committee = GetBeaconCommittee(state, data.Slot, data.Index);
return(committee
.Where((x, index) => bits[index])
.ToList()
.AsReadOnly());
}
/// <summary>
/// Check if ``data_1`` and ``data_2`` are slashable according to Casper FFG rules.
/// </summary>
public bool IsSlashableAttestationData(AttestationData data1, AttestationData data2)
{
bool isSlashable =
// Double vote
(data1.Target.Epoch == data2.Target.Epoch && !data1.Equals(data2))
// Surround vote
|| (data1.Source.Epoch < data2.Source.Epoch && data2.Target.Epoch < data1.Target.Epoch);
return(isSlashable);
}
private static AttestationData DecodeAttestationData(Span <byte> span, ref int offset)
{
AttestationData container = new AttestationData();
container.Slot = DecodeSlot(span, ref offset);
container.CommitteeIndex = DecodeCommitteeIndex(span, ref offset);
container.BeaconBlockRoot = DecodeSha256(span, ref offset);
container.Source = DecodeCheckpoint(span, ref offset);
container.Target = DecodeCheckpoint(span, ref offset);
return(container);
}
private static void TestAttestationDataSsz(byte[] serialized, UInt256 expectedMerkleRoot, string testCaseDir)
{
AttestationData container = Nethermind.Ssz.Ssz.DecodeAttestationData(serialized);
byte[] again = new byte[serialized.Length];
Nethermind.Ssz.Ssz.Encode(again, container);
Assert.AreEqual(serialized.ToHexString(), again.ToHexString(), testCaseDir);
Merkle.Ize(out UInt256 root, container);
Assert.AreEqual(expectedMerkleRoot, root);
}
private static AttestationData DecodeAttestationData(ReadOnlySpan <byte> span, ref int offset)
{
Slot slot = DecodeSlot(span, ref offset);
CommitteeIndex index = DecodeCommitteeIndex(span, ref offset);
Root beaconBlockRoot = DecodeRoot(span, ref offset);
Checkpoint source = DecodeCheckpoint(span, ref offset);
Checkpoint target = DecodeCheckpoint(span, ref offset);
AttestationData container = new AttestationData(slot, index, beaconBlockRoot, source, target);
return(container);
}
public static void Ize(out UInt256 root, AttestationData container)
{
Merkleizer merkleizer = new Merkleizer(3);
merkleizer.Feed(container.Slot);
merkleizer.Feed(container.CommitteeIndex);
merkleizer.Feed(container.BeaconBlockRoot);
merkleizer.Feed(container.Source);
merkleizer.Feed(container.Target);
merkleizer.CalculateRoot(out root);
}
public static IndexedAttestation DecodeIndexedAttestation(ReadOnlySpan <byte> span)
{
int offset = 0;
DecodeDynamicOffset(span, ref offset, out int dynamicOffset1);
ValidatorIndex[] attestingIndices = DecodeValidatorIndexes(span.Slice(dynamicOffset1));
AttestationData data = DecodeAttestationData(span, ref offset);
BlsSignature signature = DecodeBlsSignature(span, ref offset);
IndexedAttestation container = new IndexedAttestation(attestingIndices, data, signature);
return(container);
}
public static PendingAttestation DecodePendingAttestation(Span <byte> span)
{
int offset = 0;
DecodeDynamicOffset(span, ref offset, out int dynamicOffset);
BitArray aggregationBits = DecodeBitlist(span.Slice(dynamicOffset, span.Length - dynamicOffset));
AttestationData data = DecodeAttestationData(span, ref offset);
Slot inclusionDelay = DecodeSlot(span, ref offset);
ValidatorIndex proposerIndex = DecodeValidatorIndex(span, ref offset);
PendingAttestation pendingAttestation = new PendingAttestation(aggregationBits, data, inclusionDelay, proposerIndex);
return(pendingAttestation);
}
private static IEnumerable <SszElement> GetValues(AttestationData item)
{
yield return(item.Slot.ToSszBasicElement());
yield return(item.Index.ToSszBasicElement());
// LMD GHOST vote
yield return(item.BeaconBlockRoot.ToSszBasicVector());
// FFG vote
yield return(item.Source.ToSszContainer());
yield return(item.Target.ToSszContainer());
}
public void Can_merkleize_attestion_data()
{
// arrange
AttestationData attestationData = new AttestationData(
Slot.One,
new CommitteeIndex(2),
new Root(Enumerable.Repeat((byte)0x12, 32).ToArray()),
new Checkpoint(
new Epoch(3),
new Root(Enumerable.Repeat((byte)0x34, 32).ToArray())
),
new Checkpoint(
new Epoch(4),
new Root(Enumerable.Repeat((byte)0x56, 32).ToArray())
)
);
// act
Merkleizer merklezier = new Merkleizer(0);
merklezier.Feed(attestationData);
UInt256 root = merklezier.CalculateRoot();
Span <byte> bytes = MemoryMarshal.Cast <UInt256, byte>(MemoryMarshal.CreateSpan(ref root, 1));
// assert
byte[] expected = HashUtility.Hash(
HashUtility.Hash(
HashUtility.Hash(
HashUtility.Chunk(new byte[] { 0x01 }), // slot
HashUtility.Chunk(new byte[] { 0x02 }) // committee
),
HashUtility.Hash(
Enumerable.Repeat((byte)0x12, 32).ToArray(), // beacon block root
HashUtility.Hash( // source
HashUtility.Chunk(new byte[] { 0x03 }),
Enumerable.Repeat((byte)0x34, 32).ToArray()
)
)
),
HashUtility.Merge(
HashUtility.Hash( // target
HashUtility.Chunk(new byte[] { 0x04 }),
Enumerable.Repeat((byte)0x56, 32).ToArray()
),
HashUtility.ZeroHashes(0, 2)
)
).ToArray();
bytes.ToArray().ShouldBe(expected);
}
public static void Encode(Span <byte> span, AttestationData container)
{
if (span.Length != Ssz.AttestationDataLength)
{
ThrowTargetLength <AttestationData>(span.Length, Ssz.AttestationDataLength);
}
int offset = 0;
Encode(span, container.Slot, ref offset);
Encode(span, container.Index, ref offset);
Encode(span, container.BeaconBlockRoot, ref offset);
Encode(span, container.Source, ref offset);
Encode(span, container.Target, ref offset);
}
public static Attestation DecodeAttestation(ReadOnlySpan <byte> span)
{
int offset = 0;
// static part
DecodeDynamicOffset(span, ref offset, out int dynamicOffset1);
AttestationData data = DecodeAttestationData(span, ref offset);
BlsSignature signature = DecodeBlsSignature(span, ref offset);
// var part
BitArray aggregationBits = DecodeBitlist(span.Slice(dynamicOffset1, span.Length - dynamicOffset1));
Attestation container = new Attestation(aggregationBits, data, signature);
return(container);
}
public static AttestationData DecodeAttestationData(Span <byte> span)
{
if (span.Length != AttestationData.SszLength)
{
ThrowSourceLength <AttestationData>(span.Length, AttestationData.SszLength);
}
int offset = 0;
AttestationData container = new AttestationData();
container.Slot = DecodeSlot(span, ref offset);
container.CommitteeIndex = DecodeCommitteeIndex(span, ref offset);
container.BeaconBlockRoot = DecodeSha256(span, ref offset);
container.Source = DecodeCheckpoint(span, ref offset);
container.Target = DecodeCheckpoint(span, ref offset);
return(container);
}
public static AttestationData DecodeAttestationData(Span <byte> span)
{
if (span.Length != Ssz.AttestationDataLength)
{
ThrowSourceLength <AttestationData>(span.Length, Ssz.AttestationDataLength);
}
int offset = 0;
AttestationData container = new AttestationData(
DecodeSlot(span, ref offset),
DecodeCommitteeIndex(span, ref offset),
DecodeRoot(span, ref offset),
DecodeCheckpoint(span, ref offset),
DecodeCheckpoint(span, ref offset));
return(container);
}
public void Attestation_data_there_and_back()
{
AttestationData container = new AttestationData(
new Slot(1),
new CommitteeIndex(2),
Sha256.RootOfAnEmptyString,
new Checkpoint(new Epoch(1), Sha256.RootOfAnEmptyString),
new Checkpoint(new Epoch(2), Sha256.RootOfAnEmptyString));
Span <byte> encoded = new byte[Ssz.AttestationDataLength];
Ssz.Encode(encoded, container);
AttestationData decoded = Ssz.DecodeAttestationData(encoded);
Assert.AreEqual(container, decoded);
Span <byte> encodedAgain = new byte[Ssz.AttestationDataLength];
Ssz.Encode(encodedAgain, decoded);
Assert.True(Bytes.AreEqual(encodedAgain, encoded));
Merkle.Ize(out UInt256 root, container);
}
public void Indexed_attestation_there_and_back()
{
AttestationData data = new AttestationData(
new Slot(1),
new CommitteeIndex(2),
Sha256.RootOfAnEmptyString,
new Checkpoint(new Epoch(1), Sha256.RootOfAnEmptyString),
new Checkpoint(new Epoch(2), Sha256.RootOfAnEmptyString));
IndexedAttestation container = new IndexedAttestation(
new ValidatorIndex[3],
data,
TestSig1);
Span <byte> encoded = new byte[Ssz.IndexedAttestationLength(container)];
Ssz.Encode(encoded, container);
IndexedAttestation decoded = Ssz.DecodeIndexedAttestation(encoded);
decoded.ShouldBe(container);
Merkle.Ize(out UInt256 root, container);
}
public void Attestation_there_and_back()
{
AttestationData data = new AttestationData(
new Slot(1),
new CommitteeIndex(2),
Sha256.RootOfAnEmptyString,
new Checkpoint(new Epoch(1), Sha256.RootOfAnEmptyString),
new Checkpoint(new Epoch(2), Sha256.RootOfAnEmptyString));
Attestation container = new Attestation(
new BitArray(new byte[] { 1, 2, 3 }),
data,
TestSig1);
Span <byte> encoded = new byte[Ssz.AttestationLength(container)];
Ssz.Encode(encoded, container);
Attestation decoded = Ssz.DecodeAttestation(encoded);
Assert.AreEqual(container, decoded);
Merkle.Ize(out UInt256 root, container);
}
// def get_valid_attestation(spec, state, slot=None, index=None, signed=False):
public static Attestation GetValidAttestation(IServiceProvider testServiceProvider, BeaconState state, Slot?optionalSlot, CommitteeIndex?optionalIndex, bool signed)
{
BeaconStateAccessor beaconStateAccessor = testServiceProvider.GetService <BeaconStateAccessor>();
Slot slot = optionalSlot ?? state.Slot;
CommitteeIndex index = optionalIndex ?? CommitteeIndex.Zero;
AttestationData attestationData = BuildAttestationData(testServiceProvider, state, slot, index);
IReadOnlyList <ValidatorIndex> beaconCommittee = beaconStateAccessor.GetBeaconCommittee(state, attestationData.Slot, attestationData.Index);
int committeeSize = beaconCommittee.Count;
BitArray aggregationBits = new BitArray(committeeSize);
Attestation attestation = new Attestation(aggregationBits, attestationData, BlsSignature.Zero);
FillAggregateAttestation(state, attestation, beaconStateAccessor);
if (signed)
{
SignAttestation(testServiceProvider, state, attestation);
}
return(attestation);
}
public void Pending_attestation_there_and_back()
{
AttestationData data = new AttestationData(
new Slot(1),
new CommitteeIndex(2),
Sha256.RootOfAnEmptyString,
new Checkpoint(new Epoch(1), Sha256.RootOfAnEmptyString),
new Checkpoint(new Epoch(2), Sha256.RootOfAnEmptyString));
PendingAttestation container = new PendingAttestation(
new BitArray(new byte[3]),
data,
new Slot(7),
new ValidatorIndex(13));
Span <byte> encoded = new byte[Ssz.PendingAttestationLength(container)];
Ssz.Encode(encoded, container);
PendingAttestation?decoded = Ssz.DecodePendingAttestation(encoded);
decoded.ShouldBe(container);
Merkle.Ize(out UInt256 root, container);
}
public void Attester_slashing_there_and_back()
{
AttestationData data = new AttestationData();
data.Slot = new Slot(1);
data.CommitteeIndex = new CommitteeIndex(2);
data.BeaconBlockRoot = Sha256.OfAnEmptyString;
data.Source = new Checkpoint(new Epoch(1), Sha256.OfAnEmptyString);
data.Target = new Checkpoint(new Epoch(2), Sha256.OfAnEmptyString);
IndexedAttestation indexedAttestation1 = new IndexedAttestation();
indexedAttestation1.AttestingIndices = new ValidatorIndex[3];
indexedAttestation1.Data = data;
indexedAttestation1.Signature = BlsSignature.TestSig1;
IndexedAttestation indexedAttestation2 = new IndexedAttestation();
indexedAttestation2.AttestingIndices = new ValidatorIndex[5];
indexedAttestation2.Data = data;
indexedAttestation2.Signature = BlsSignature.TestSig1;
AttesterSlashing container = new AttesterSlashing();
container.Attestation1 = indexedAttestation1;
container.Attestation2 = indexedAttestation2;
Span <byte> encoded = new byte[AttesterSlashing.SszLength(container)];
Ssz.Encode(encoded, container);
AttesterSlashing?decoded = Ssz.DecodeAttesterSlashing(encoded);
Assert.AreEqual(container, decoded);
Merkle.Ize(out UInt256 root, container);
}
public void Attestation_data_there_and_back()
{
AttestationData container = new AttestationData();
container.Slot = new Slot(1);
container.CommitteeIndex = new CommitteeIndex(2);
container.BeaconBlockRoot = Sha256.OfAnEmptyString;
container.Source = new Checkpoint(new Epoch(1), Sha256.OfAnEmptyString);
container.Target = new Checkpoint(new Epoch(2), Sha256.OfAnEmptyString);
Span <byte> encoded = new byte[AttestationData.SszLength];
Ssz.Encode(encoded, container);
AttestationData decoded = Ssz.DecodeAttestationData(encoded);
Assert.AreEqual(container, decoded);
Span <byte> encodedAgain = new byte[AttestationData.SszLength];
Ssz.Encode(encodedAgain, decoded);
Assert.True(Bytes.AreEqual(encodedAgain, encoded));
Merkle.Ize(out UInt256 root, container);
}
public SszBeaconBlockBodyBenchmark()
{
AttestationData data = new AttestationData(
new Slot(1),
new CommitteeIndex(4),
Sha256.RootOfAnEmptyString,
new Checkpoint(new Epoch(2), Sha256.RootOfAnEmptyString),
new Checkpoint(new Epoch(3), Sha256.RootOfAnEmptyString));
Attestation attestation = new Attestation(
new BitArray(new byte[5]),
data,
TestSig1
);
DepositData depositData = new DepositData(
TestKey1,
Sha256.Bytes32OfAnEmptyString,
new Gwei(7),
TestSig1);
Deposit deposit = new Deposit(
new Bytes32[Ssz.DepositContractTreeDepth + 1],
depositData);
IndexedAttestation indexedAttestation1 = new IndexedAttestation(
new ValidatorIndex[8],
data,
TestSig1);
IndexedAttestation indexedAttestation2 = new IndexedAttestation(
new ValidatorIndex[8],
data,
TestSig1);
AttesterSlashing slashing = new AttesterSlashing(indexedAttestation1, indexedAttestation2);
Eth1Data eth1Data = new Eth1Data(
Sha256.RootOfAnEmptyString,
9,
Sha256.Bytes32OfAnEmptyString);
Attestation[] attestations = new Attestation[3];
attestations[1] = attestation;
Deposit[] deposits = new Deposit[3];
deposits[2] = deposit;
Bytes32 graffiti = new Bytes32(new byte[32]);
AttesterSlashing[] attesterSlashings = new AttesterSlashing[3];
attesterSlashings[0] = slashing;
ProposerSlashing[] proposerSlashings = new ProposerSlashing[10];
BlsSignature randaoReveal = TestSig1;
SignedVoluntaryExit[] signedVoluntaryExits = new SignedVoluntaryExit[11];
_body = new BeaconBlockBody(randaoReveal,
eth1Data,
graffiti,
proposerSlashings,
attesterSlashings,
attestations,
deposits,
signedVoluntaryExits);
_encoded = new byte[Ssz.BeaconBlockBodyLength(_body)];
}
public Root HashTreeRoot(AttestationData attestationData)
{
throw new NotImplementedException();
}
public static SszContainer ToSszContainer(this AttestationData item)
{
return(new SszContainer(GetValues(item)));
}
public static Hash32 HashTreeRoot(this AttestationData item)
{
var tree = new SszTree(item.ToSszContainer());
return(new Hash32(tree.HashTreeRoot()));
}
public static BlsSignature SignAggregateAttestation(IServiceProvider testServiceProvider, BeaconState state, AttestationData attestationData, IEnumerable <ValidatorIndex> participants)
{
var timeParameters = testServiceProvider.GetService <IOptions <TimeParameters> >().Value;
var privateKeys = TestKeys.PrivateKeys(timeParameters).ToList();
var signatures = new List <BlsSignature>();
foreach (var validatorIndex in participants)
{
var privateKey = privateKeys[(int)(ulong)validatorIndex];
var signature = GetAttestationSignature(testServiceProvider, state, attestationData, privateKey, custodyBit: false);
signatures.Add(signature);
}
return(TestSecurity.BlsAggregateSignatures(signatures));
}
public static BlsSignature GetAttestationSignature(IServiceProvider testServiceProvider, BeaconState state, AttestationData attestationData, byte[] privateKey, bool custodyBit)
{
var signatureDomains = testServiceProvider.GetService <IOptions <SignatureDomains> >().Value;
var beaconStateAccessor = testServiceProvider.GetService <BeaconStateAccessor>();
var message = new AttestationDataAndCustodyBit(attestationData, custodyBit);
var messageHash = message.HashTreeRoot();
var domain = beaconStateAccessor.GetDomain(state, signatureDomains.BeaconAttester, attestationData.Target.Epoch);
var signature = TestSecurity.BlsSign(messageHash, privateKey, domain);
return(signature);
}
private static AttestationData BuildAttestationData(IServiceProvider testServiceProvider, BeaconState state, Slot slot, CommitteeIndex index)
{
var beaconChainUtility = testServiceProvider.GetService <BeaconChainUtility>();
var beaconStateAccessor = testServiceProvider.GetService <BeaconStateAccessor>();
if (state.Slot > slot)
{
throw new ArgumentOutOfRangeException(nameof(slot), slot, $"Slot cannot be greater than state slot {state.Slot}.");
}
Hash32 blockRoot;
if (slot == state.Slot)
{
var nextBlock = TestBlock.BuildEmptyBlockForNextSlot(testServiceProvider, state, false);
blockRoot = nextBlock.ParentRoot;
}
else
{
blockRoot = beaconStateAccessor.GetBlockRootAtSlot(state, slot);
}
Hash32 epochBoundaryRoot;
var currentEpoch = beaconStateAccessor.GetCurrentEpoch(state);
var currentEpochStartSlot = beaconChainUtility.ComputeStartSlotOfEpoch(currentEpoch);
if (slot < currentEpochStartSlot)
{
var previousEpoch = beaconStateAccessor.GetPreviousEpoch(state);
epochBoundaryRoot = beaconStateAccessor.GetBlockRoot(state, previousEpoch);
}
else if (slot == currentEpochStartSlot)
{
epochBoundaryRoot = blockRoot;
}
else
{
epochBoundaryRoot = beaconStateAccessor.GetBlockRoot(state, currentEpoch);
}
Epoch sourceEpoch;
Hash32 sourceRoot;
if (slot < currentEpochStartSlot)
{
sourceEpoch = state.PreviousJustifiedCheckpoint.Epoch;
sourceRoot = state.PreviousJustifiedCheckpoint.Root;
}
else
{
sourceEpoch = state.CurrentJustifiedCheckpoint.Epoch;
sourceRoot = state.CurrentJustifiedCheckpoint.Root;
}
//Crosslink parentCrosslink;
//if (epochOfSlot == currentEpoch)
//{
// parentCrosslink = state.CurrentCrosslinks[(int)(ulong)shard];
//}
//else
//{
// throw new NotImplementedException();
//}
var slotEpoch = beaconChainUtility.ComputeEpochAtSlot(slot);
var attestationData = new AttestationData(
slot,
index,
blockRoot,
new Checkpoint(sourceEpoch, sourceRoot),
new Checkpoint(slotEpoch, epochBoundaryRoot));
return(attestationData);
}
public Hash32 HashTreeRoot(AttestationData attestationData)
{
Merkle.Ize(out UInt256 root, attestationData);
Span<byte> bytes = MemoryMarshal.Cast<UInt256, byte>(MemoryMarshal.CreateSpan(ref root, 1));
return new Hash32(bytes);
}
