public PayToMultiSigTemplateParameters ExtractScriptPubKeyParameters(Script scriptPubKey)
{
if (!CheckScriptPubKey(scriptPubKey))
{
return(null);
}
var ops = scriptPubKey.ToOps().ToArray();
var sigCount = (byte)ops[0].PushData[0];
List <PubKey> keys = new List <PubKey>();
for (int i = 1; i < ops.Length; i++)
{
if (!PubKey.IsValidSize(ops[i].PushData.Length))
{
break;
}
keys.Add(new PubKey(ops[i].PushData));
}
return(new PayToMultiSigTemplateParameters()
{
SignatureCount = sigCount,
PubKeys = keys.ToArray()
});
}
public override bool CheckScriptSig(Script scriptSig, Script scriptPubKey)
{
var ops = scriptSig.ToOps().ToArray();
if (ops.Length != 2)
{
return(false);
}
return(ops[0].PushData != null &&
ops[1].PushData != null && PubKey.IsValidSize(ops[1].PushData.Length));
}
public override bool CheckScriptPubKey(Script scriptPubKey)
{
var ops = scriptPubKey.ToOps().ToList();
if (ops.Count != 2)
{
return(false);
}
return(ops[0].PushData != null && PubKey.IsValidSize(ops[0].PushData.Length) &&
ops[1].Code == OpcodeType.OP_CHECKSIG);
}
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[1].PushData != null && PubKey.IsValidSize(ops[1].PushData.Length));
}
protected override bool CheckScriptPubKeyCore(Script scriptPubKey, Op[] scriptPubKeyOps)
{
var ops = scriptPubKeyOps;
if (ops.Length != 2)
{
return(false);
}
return(ops[0].PushData != null && PubKey.IsValidSize(ops[0].PushData.Length) &&
ops[1].Code == OpcodeType.OP_CHECKSIG);
}
public PayToMultiSigTemplateParameters ExtractScriptPubKeyParameters(Script scriptPubKey)
{
if (!FastCheckScriptPubKey(scriptPubKey))
{
return(null);
}
var ops = scriptPubKey.ToOps().ToArray();
if (!CheckScriptPubKeyCore(scriptPubKey, ops))
{
return(null);
}
var sigCount = (int)ops[0].GetValue();
var keyCount = (int)ops[ops.Length - 2].GetValue();
List <PubKey> keys = new List <PubKey>();
List <byte[]> invalidKeys = new List <byte[]>();
for (int i = 1; i < keyCount + 1; i++)
{
if (!PubKey.IsValidSize(ops[i].PushData.Length))
{
invalidKeys.Add(ops[i].PushData);
}
else
{
try
{
keys.Add(new PubKey(ops[i].PushData));
}
catch (FormatException)
{
invalidKeys.Add(ops[i].PushData);
}
}
}
return(new PayToMultiSigTemplateParameters()
{
SignatureCount = sigCount,
PubKeys = keys.ToArray(),
InvalidPubKeys = invalidKeys.ToArray()
});
}
public override bool CheckScriptPubKey(Script scriptPubKey)
{
var ops = scriptPubKey.ToOps().ToArray();
if (ops.Length < 3)
{
return(false);
}
var sigCount = ops[0];
if (!sigCount.IsSmallUInt)
{
return(false);
}
var expectedKeyCount = 0;
var keyCountIndex = 0;
for (int i = 1; i < ops.Length; i++)
{
if (ops[i].PushData == null)
{
return(false);
}
if (!PubKey.IsValidSize(ops[i].PushData.Length))
{
keyCountIndex = i;
break;
}
expectedKeyCount++;
}
if (!ops[keyCountIndex].IsSmallUInt)
{
return(false);
}
if (ops[keyCountIndex].GetValue() != expectedKeyCount)
{
return(false);
}
return(ops[keyCountIndex + 1].Code == OpcodeType.OP_CHECKMULTISIG &&
keyCountIndex + 1 == ops.Length - 1);
}
private bool CheckSig(byte[] vchSig, byte[] vchPubKey, Script scriptCode, Transaction txTo, int nIn)
{
//static CSignatureCache signatureCache;
if (!PubKey.IsValidSize(vchPubKey.Length))
{
return(false);
}
PubKey pubkey = null;
try
{
pubkey = new PubKey(vchPubKey);
}
catch (Exception)
{
return(false);
}
// Hash type is one byte tacked on to the end of the signature
if (vchSig.Length == 0)
{
return(false);
}
var scriptSig = new TransactionSignature(vchSig);
if (!IsAllowedSignature(scriptSig.SigHash))
{
return(false);
}
uint256 sighash = scriptCode.SignatureHash(txTo, nIn, scriptSig.SigHash);
//if (signatureCache.Get(sighash, vchSig, pubkey))
// return true;
if (!pubkey.Verify(sighash, scriptSig.Signature))
{
if ((ScriptVerify & ScriptVerify.StrictEnc) != 0)
{
return(false);
}
//Replicate OpenSSL bug on 23b397edccd3740a74adb603c9756370fafcde9bcc4483eb271ecad09a94dd63 (http://r6.ca/blog/20111119T211504Z.html)
var nLenR = vchSig[3];
var nLenS = vchSig[5 + nLenR];
var R = 4;
var S = 6 + nLenR;
var newS = new Org.BouncyCastle.Math.BigInteger(1, vchSig, S, nLenS);
var newR = new Org.BouncyCastle.Math.BigInteger(1, vchSig, R, nLenR);
var sig2 = new ECDSASignature(newR, newS);
if (sig2.R != scriptSig.Signature.R || sig2.S != scriptSig.Signature.S)
{
if (!pubkey.Verify(sighash, sig2))
{
return(false);
}
}
}
//if (!(flags & SCRIPT_VERIFY_NOCACHE))
// signatureCache.Set(sighash, vchSig, pubkey);
return(true);
}
