internal static bool VerifyScripts(this IVerifiable verifiable)
{
UInt160[] hashes;
try
{
hashes = verifiable.GetScriptHashesForVerifying();
}
catch (InvalidOperationException)
{
return(false);
}
if (hashes.Length != verifiable.Scripts.Length)
{
return(false);
}
for (int i = 0; i < hashes.Length; i++)
{
byte[] verification = verifiable.Scripts[i].VerificationScript;
if (verification.Length == 0)
{
using (ScriptBuilder sb = new ScriptBuilder())
{
sb.EmitAppCall(hashes[i].ToArray());
verification = sb.ToArray();
}
}
else
{
if (hashes[i] != verifiable.Scripts[i].ScriptHash)
{
return(false);
}
}
using (StateReader service = new StateReader(verifiable))
{
ApplicationEngine engine = new ApplicationEngine(TriggerType.Verification, verifiable,
BlockchainBase.GetBlockchain(verifiable.ChainHash), service, Fixed8.Zero);
engine.LoadScript(verification, false);
engine.LoadScript(verifiable.Scripts[i].InvocationScript, true);
if (!engine.Execute())
{
return(false);
}
if (engine.EvaluationStack.Count != 1 || !engine.EvaluationStack.Pop().GetBoolean())
{
return(false);
}
}
}
return(true);
}
private bool VerifyAccountState(UInt256 ChainHash)
{
switch (Field)
{
case "Votes":
BlockchainBase chain = BlockchainBase.GetBlockchain(ChainHash);
if (chain == null)
{
return(false);
}
ECPoint[] pubkeys;
try
{
pubkeys = Value.AsSerializableArray <ECPoint>((int)BlockchainBase.MaxValidators);
}
catch (FormatException)
{
return(false);
}
UInt160 hash = new UInt160(Key);
AccountState account = chain.GetAccountState(hash);
if (account?.IsFrozen != false)
{
return(false);
}
if (pubkeys.Length > 0)
{
if (account.GetBalance(BlockchainBase.GetStaticAttr().GoverningToken.Hash).Equals(Fixed8.Zero))
{
return(false);
}
HashSet <ECPoint> sv = new HashSet <ECPoint>(chain.StandbyValidators);
DataCache <ECPoint, ValidatorState> validators = chain.GetStates <ECPoint, ValidatorState>();
foreach (ECPoint pubkey in pubkeys)
{
if (!sv.Contains(pubkey) && validators.TryGet(pubkey)?.Registered != true)
{
return(false);
}
}
}
return(true);
default:
return(false);
}
}