internal static bool VerifyWitness(this IVerifiable verifiable, StoreView snapshot, UInt160 hash, Witness witness, long gas, out long fee)
{
fee = 0;
using (ApplicationEngine engine = ApplicationEngine.Create(TriggerType.Verification, verifiable, snapshot?.Clone(), 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);
}
if (engine.LoadContract(cs, "verify", callFlags, true, 0) is null)
{
return(false);
}
}
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);
}
internal static bool VerifyWitness(this IVerifiable verifiable, 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, gas))
{
CallFlags callFlags = !witness.VerificationScript.IsStandardContract() ? CallFlags.ReadStates : CallFlags.None;
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);
}
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;
p.ScriptHash = hash;
});
}
engine.LoadScript(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);
}