public TransactionSignature ExtractScriptSigParameters(Script scriptSig)
{
var ops = scriptSig.ToOps().ToArray();
if (!CheckScriptSigCore(scriptSig, ops, null, null))
{
return(null);
}
var data = ops[0].PushData;
if (!TransactionSignature.ValidLength(data.Length))
{
return(null);
}
try
{
return(new TransactionSignature(data));
}
catch (FormatException)
{
return(null);
}
}
public Script GenerateScriptSig(TransactionSignature signature, PubKey publicKey)
{
if (publicKey == null)
{
throw new ArgumentNullException(nameof(publicKey));
}
return(new Script(
signature == null ? OpcodeType.OP_0 : Op.GetPushOp(signature.ToBytes()),
Op.GetPushOp(publicKey.ToBytes())
));
}
protected override bool CheckScriptSigCore(Script scriptSig, Op[] scriptSigOps, Script scriptPubKey,
Op[] scriptPubKeyOps)
{
var ops = scriptSigOps;
if (ops.Length != 1)
{
return(false);
}
return(ops[0].PushData != null && TransactionSignature.IsValid(ops[0].PushData));
}
protected override bool CheckScriptSigCore(Script scriptSig, Op[] scriptSigOps, Script scriptPubKey,
Op[] scriptPubKeyOps)
{
var ops = scriptSigOps;
if (ops.Length != 2)
{
return(false);
}
return(ops[0].PushData != null &&
(ops[0].Code == OpcodeType.OP_0 ||
TransactionSignature.IsValid(ops[0].PushData, ScriptVerify.None)) &&
ops[1].PushData != null && PubKey.Check(ops[1].PushData, false));
}
protected override bool CheckScriptSigCore(Script scriptSig, Op[] scriptSigOps, Script scriptPubKey,
Op[] scriptPubKeyOps)
{
if (!scriptSig.IsPushOnly)
{
return(false);
}
if (scriptSigOps[0].Code != OpcodeType.OP_0)
{
return(false);
}
if (scriptSigOps.Length == 1)
{
return(false);
}
if (!scriptSigOps.Skip(1).All(s =>
TransactionSignature.ValidLength(s.PushData.Length) || s.Code == OpcodeType.OP_0))
{
return(false);
}
if (scriptPubKeyOps != null)
{
if (!CheckScriptPubKeyCore(scriptPubKey, scriptPubKeyOps))
{
return(false);
}
var sigCountExpected = scriptPubKeyOps[0].GetInt();
if (sigCountExpected == null)
{
return(false);
}
return(sigCountExpected == scriptSigOps.Length + 1);
}
return(true);
}
public Script GenerateScriptSig(TransactionSignature signature)
{
return(new Script(
Op.GetPushOp(signature.ToBytes())
));
}
