private Witness CreateMultiSignatureWitness(Signature[] signatures)
{
ECPoint[] pubKeys = new ECPoint[signatures.Length];
for (int i = 0; i < signatures.Length; i++)
{
if (!VerifyKeyAndSignature(signatures[i], out ECPoint pubKey))
{
return(null);
}
pubKeys[i] = pubKey;
}
// sort public keys in ascending order, also match their signature
Dictionary <ECPoint, Signature> dic = pubKeys.Select((p, i) => new
{
PubKey = p,
Sig = signatures[i]
}).OrderBy(p => p.PubKey).ToDictionary(p => p.PubKey, p => p.Sig);
Witness witness = new Witness();
using (ScriptBuilder sb = new ScriptBuilder())
{
dic.Values.ToList().ForEach(p => sb.EmitPush(p.Bytes));
witness.InvocationScript = sb.ToArray();
}
witness.VerificationScript = Contract.CreateMultiSigRedeemScript(signatures.Length, dic.Keys.ToArray());
return(witness);
}