protected internal byte[] Sha256(StackItem item)
{
ReadOnlySpan <byte> value = item switch
{
InteropInterface _interface => _interface.GetInterface <IVerifiable>().GetHashData(),
Null _ => ScriptContainer.GetHashData(),
_ => item.GetSpan()
};
return(value.Sha256());
}
private bool VerifyWithECDsa(StackItem item, byte[] pubkey, byte[] signature, ECCurve curve)
{
ReadOnlySpan <byte> message = item switch
{
InteropInterface _interface => _interface.GetInterface <IVerifiable>().GetHashData(),
Null _ => ScriptContainer.GetHashData(),
_ => item.GetSpan()
};
try
{
return(Crypto.VerifySignature(message, signature, pubkey, curve));
}
catch (ArgumentException)
{
return(false);
}
}
private bool CheckMultiSigWithECDsa(StackItem item0, byte[][] pubkeys, byte[][] signatures, ECCurve curve)
{
int m = signatures.Length, n = pubkeys.Length;
ReadOnlySpan <byte> message = item0 switch
{
InteropInterface _interface => _interface.GetInterface <IVerifiable>().GetHashData(),
Null _ => ScriptContainer.GetHashData(),
_ => item0.GetSpan()
};
if (n == 0 || m == 0 || m > n)
{
throw new ArgumentException();
}
AddGas(ECDsaVerifyPrice * n * exec_fee_factor);
try
{
for (int i = 0, j = 0; i < m && j < n;)
{
if (Crypto.VerifySignature(message, signatures[i], pubkeys[j], curve))
{
i++;
}
j++;
if (m - i > n - j)
{
return(false);
}
}
}
catch (ArgumentException)
{
return(false);
}
return(true);
}
}