internal static VerificationResult VerifySignature(this ISignable signable)
{
UInt160[] hashes;
try
{
hashes = signable.GetScriptHashesForVerifying();
}
catch (InvalidOperationException)
{
return VerificationResult.LackOfInformation;
}
byte[][] scripts = signable.Scripts;
if (hashes.Length != scripts.Length)
return VerificationResult.InvalidSignature;
for (int i = 0; i < hashes.Length; i++)
{
using (ScriptBuilder sb = new ScriptBuilder())
{
byte[] script = sb.Add(scripts[i]).Add(ScriptOp.OP_DUP).Add(ScriptOp.OP_HASH160).Push(hashes[i]).Add(ScriptOp.OP_EQUALVERIFY).Add(ScriptOp.OP_EVAL).ToArray();
if (!ScriptEngine.Execute(script, signable.GetHashForSigning()))
return VerificationResult.InvalidSignature;
}
}
return VerificationResult.OK;
}
public static byte[] CreateSignatureRedeemScript(ECPoint publicKey)
{
using (ScriptBuilder sb = new ScriptBuilder())
{
sb.Push(publicKey.EncodePoint(true));
sb.Add(ScriptOp.OP_CHECKSIG);
return sb.ToArray();
}
}
public static byte[] CreateMultiSigRedeemScript(int m, params ECPoint[] publicKeys)
{
if (!(1 <= m && m <= publicKeys.Length && publicKeys.Length <= 1024))
throw new ArgumentException();
using (ScriptBuilder sb = new ScriptBuilder())
{
sb.Push(m);
for (int i = 0; i < publicKeys.Length; i++)
{
sb.Push(publicKeys[i].EncodePoint(true));
}
sb.Push(publicKeys.Length);
sb.Add(ScriptOp.OP_CHECKMULTISIG);
return sb.ToArray();
}
}
public Script[] GetScripts()
{
if (!Completed) throw new InvalidOperationException();
Script[] scripts = new Script[signatures.Length];
for (int i = 0; i < scripts.Length; i++)
{
using (ScriptBuilder sb = new ScriptBuilder())
{
foreach (byte[] signature in signatures[i].OrderBy(p => p.Key).Select(p => p.Value))
{
sb.Push(signature);
}
scripts[i] = new Script
{
StackScript = sb.ToArray(),
RedeemScript = redeemScripts[i]
};
}
}
return scripts;
}
public Script GetScript()
{
if (!Completed) throw new InvalidOperationException();
using (ScriptBuilder sb = new ScriptBuilder())
{
for (int i = 0; i < signatures.Length; i++)
{
if (signatures[i] != null)
{
sb.Push(signatures[i]);
}
}
return new Script
{
StackScript = sb.ToArray(),
RedeemScript = redeemScript
};
}
}
