internal static bool VerifyWitness(this IVerifiable verifiable, ProtocolSettings settings, DataCache snapshot, UInt160 hash, Witness witness, long gas, out long fee)
{
fee = 0;
Script invocationScript;
try
{
invocationScript = new Script(witness.InvocationScript, true);
}
catch (BadScriptException)
{
return(false);
}
using (ApplicationEngine engine = ApplicationEngine.Create(TriggerType.Verification, verifiable, snapshot?.CreateSnapshot(), null, settings, gas))
{
if (witness.VerificationScript.Length == 0)
{
ContractState cs = NativeContract.ContractManagement.GetContract(snapshot, hash);
if (cs is null)
{
return(false);
}
ContractMethodDescriptor md = cs.Manifest.Abi.GetMethod("verify", -1);
if (md?.ReturnType != ContractParameterType.Boolean)
{
return(false);
}
engine.LoadContract(cs, md, CallFlags.ReadOnly);
}
else
{
if (NativeContract.IsNative(hash))
{
return(false);
}
if (hash != witness.ScriptHash)
{
return(false);
}
Script verificationScript;
try
{
verificationScript = new Script(witness.VerificationScript, true);
}
catch (BadScriptException)
{
return(false);
}
engine.LoadScript(verificationScript, initialPosition: 0, configureState: p =>
{
p.CallFlags = CallFlags.ReadOnly;
p.ScriptHash = hash;
});
}
engine.LoadScript(invocationScript, configureState: p => p.CallFlags = CallFlags.None);
if (engine.Execute() == VMState.FAULT)
{
return(false);
}
if (!engine.ResultStack.Peek().GetBoolean())
{
return(false);
}
fee = engine.GasConsumed;
}
return(true);
}
internal static bool VerifyWitnesses(this IVerifiable verifiable, StoreView snapshot, long gas)
{
if (gas < 0)
{
return(false);
}
UInt160[] hashes;
try
{
hashes = verifiable.GetScriptHashesForVerifying(snapshot);
}
catch (InvalidOperationException)
{
return(false);
}
if (hashes.Length != verifiable.Witnesses.Length)
{
return(false);
}
for (int i = 0; i < hashes.Length; i++)
{
int offset;
byte[] verification = verifiable.Witnesses[i].VerificationScript;
if (verification.Length == 0)
{
ContractState cs = snapshot.Contracts.TryGet(hashes[i]);
if (cs is null)
{
return(false);
}
ContractMethodDescriptor md = cs.Manifest.Abi.GetMethod("verify");
if (md is null)
{
return(false);
}
verification = cs.Script;
offset = md.Offset;
}
else
{
if (hashes[i] != verifiable.Witnesses[i].ScriptHash)
{
return(false);
}
offset = 0;
}
using (ApplicationEngine engine = new ApplicationEngine(TriggerType.Verification, verifiable, snapshot, gas))
{
engine.LoadScript(verification, CallFlags.ReadOnly).InstructionPointer = offset;
engine.LoadScript(verifiable.Witnesses[i].InvocationScript, CallFlags.None);
if (engine.Execute() == VMState.FAULT)
{
return(false);
}
if (!engine.ResultStack.TryPop(out StackItem result) || !result.ToBoolean())
{
return(false);
}
gas -= engine.GasConsumed;
}
}
return(true);
}
internal static bool VerifyWitnesses(this IVerifiable verifiable, StoreView snapshot, long gas, WitnessFlag filter = WitnessFlag.All)
{
if (gas < 0)
{
return(false);
}
if (gas > MaxVerificationGas)
{
gas = MaxVerificationGas;
}
UInt160[] hashes;
try
{
hashes = verifiable.GetScriptHashesForVerifying(snapshot);
}
catch (InvalidOperationException)
{
return(false);
}
if (hashes.Length != verifiable.Witnesses.Length)
{
return(false);
}
for (int i = 0; i < hashes.Length; i++)
{
WitnessFlag flag = verifiable.Witnesses[i].StateDependent ? WitnessFlag.StateDependent : WitnessFlag.StateIndependent;
if (!filter.HasFlag(flag))
{
gas -= verifiable.Witnesses[i].GasConsumed;
if (gas < 0)
{
return(false);
}
continue;
}
int offset;
ContractMethodDescriptor init = null;
byte[] verification = verifiable.Witnesses[i].VerificationScript;
if (verification.Length == 0)
{
ContractState cs = snapshot.Contracts.TryGet(hashes[i]);
if (cs is null)
{
return(false);
}
ContractMethodDescriptor md = cs.Manifest.Abi.GetMethod("verify");
if (md is null)
{
return(false);
}
verification = cs.Script;
offset = md.Offset;
init = cs.Manifest.Abi.GetMethod("_initialize");
}
else
{
if (NativeContract.IsNative(hashes[i]))
{
return(false);
}
if (hashes[i] != verifiable.Witnesses[i].ScriptHash)
{
return(false);
}
offset = 0;
}
using (ApplicationEngine engine = ApplicationEngine.Create(TriggerType.Verification, verifiable, snapshot?.Clone(), gas))
{
CallFlags callFlags = verifiable.Witnesses[i].StateDependent ? CallFlags.AllowStates : CallFlags.None;
ExecutionContext context = engine.LoadScript(verification, callFlags, offset);
if (NativeContract.IsNative(hashes[i]))
{
using ScriptBuilder sb = new ScriptBuilder();
sb.Emit(OpCode.DEPTH, OpCode.PACK);
sb.EmitPush("verify");
engine.LoadScript(sb.ToArray(), CallFlags.None);
}
else if (init != null)
{
engine.LoadContext(context.Clone(init.Offset), false);
}
engine.LoadScript(verifiable.Witnesses[i].InvocationScript, CallFlags.None);
if (engine.Execute() == VMState.FAULT)
{
return(false);
}
if (engine.ResultStack.Count != 1 || !engine.ResultStack.Pop().GetBoolean())
{
return(false);
}
gas -= engine.GasConsumed;
verifiable.Witnesses[i].GasConsumed = engine.GasConsumed;
}
}
return(true);
}
internal static bool VerifyWitnesses(this IVerifiable verifiable, StoreView snapshot, long gas, WitnessFlag filter = WitnessFlag.All)
{
if (gas < 0)
{
return(false);
}
if (gas > MaxVerificationGas)
{
gas = MaxVerificationGas;
}
UInt160[] hashes;
try
{
hashes = verifiable.GetScriptHashesForVerifying(snapshot);
}
catch (InvalidOperationException)
{
return(false);
}
if (hashes.Length != verifiable.Witnesses.Length)
{
return(false);
}
for (int i = 0; i < hashes.Length; i++)
{
WitnessFlag flag = verifiable.Witnesses[i].StateDependent ? WitnessFlag.StateDependent : WitnessFlag.StateIndependent;
if (!filter.HasFlag(flag))
{
gas -= verifiable.Witnesses[i].GasConsumed;
if (gas < 0)
{
return(false);
}
continue;
}
using (ApplicationEngine engine = ApplicationEngine.Create(TriggerType.Verification, verifiable, snapshot?.Clone(), gas))
{
CallFlags callFlags = verifiable.Witnesses[i].StateDependent ? CallFlags.AllowStates : CallFlags.None;
byte[] verification = verifiable.Witnesses[i].VerificationScript;
if (verification.Length == 0)
{
ContractState cs = snapshot.Contracts.TryGet(hashes[i]);
if (cs is null)
{
return(false);
}
if (engine.LoadContract(cs, "verify", callFlags, true) is null)
{
return(false);
}
}
else
{
if (NativeContract.IsNative(hashes[i]))
{
return(false);
}
if (hashes[i] != verifiable.Witnesses[i].ScriptHash)
{
return(false);
}
engine.LoadScript(verification, callFlags, 0);
}
engine.LoadScript(verifiable.Witnesses[i].InvocationScript, CallFlags.None);
if (engine.Execute() == VMState.FAULT)
{
return(false);
}
if (engine.ResultStack.Count != 1 || !engine.ResultStack.Pop().GetBoolean())
{
return(false);
}
gas -= engine.GasConsumed;
verifiable.Witnesses[i].GasConsumed = engine.GasConsumed;
}
}
return(true);
}
internal static bool VerifyWitness(this IVerifiable verifiable, DataCache snapshot, UInt160 hash, Witness witness, long gas, out long fee)
{
fee = 0;
using (ApplicationEngine engine = ApplicationEngine.Create(TriggerType.Verification, verifiable, snapshot?.CreateSnapshot(), null, gas))
{
CallFlags callFlags = !witness.VerificationScript.IsStandardContract() ? CallFlags.ReadStates : CallFlags.None;
byte[] verification = witness.VerificationScript;
if (verification.Length == 0)
{
ContractState cs = NativeContract.ContractManagement.GetContract(snapshot, hash);
if (cs is null)
{
return(false);
}
ContractMethodDescriptor md = cs.Manifest.Abi.GetMethod("verify", -1);
if (md?.ReturnType != ContractParameterType.Boolean)
{
return(false);
}
engine.LoadContract(cs, md, callFlags);
}
else
{
if (NativeContract.IsNative(hash))
{
return(false);
}
if (hash != witness.ScriptHash)
{
return(false);
}
engine.LoadScript(verification, initialPosition: 0, configureState: p =>
{
p.CallFlags = callFlags;
p.ScriptHash = hash;
});
}
engine.LoadScript(witness.InvocationScript, configureState: p => p.CallFlags = CallFlags.None);
if (NativeContract.IsNative(hash))
{
try
{
engine.StepOut();
engine.Push("verify");
}
catch { }
}
if (engine.Execute() == VMState.FAULT)
{
return(false);
}
if (!engine.ResultStack.Peek().GetBoolean())
{
return(false);
}
fee = engine.GasConsumed;
}
return(true);
}
