return false;
}
- public static Hash256 SignatureHash(CScript scriptCode, CTransaction txTo, int nIn, int nHashType)
+ /// <summary>
+ /// Generation of SignatureHash. This method is responsible for removal of transaction metadata. It's necessary signature can't sign itself.
+ /// </summary>
+ /// <param name="script">Spending instructions</param>
+ /// <param name="txTo">Instance of transaction</param>
+ /// <param name="nIn">Input number</param>
+ /// <param name="nHashType">Hash type flag</param>
+ /// <returns></returns>
+ public static Hash256 SignatureHash(CScript script, CTransaction txTo, int nIn, int nHashType)
{
if (nIn >= txTo.vin.Length)
{
throw new ArgumentOutOfRangeException("nIn", sb.ToString());
}
+ // Init a copy of transaction
CTransaction txTmp = new CTransaction(txTo);
// In case concatenating two scripts ends up with two codeseparators,
// or an extra one at the end, this prevents all those possible incompatibilities.
- scriptCode.RemovePattern(new byte[] { (byte)instruction.OP_CODESEPARATOR });
+ script.RemovePattern(new byte[] { (byte)instruction.OP_CODESEPARATOR });
// Blank out other inputs' signatures
for (int i = 0; i < txTmp.vin.Length; i++)
{
txTmp.vin[i].scriptSig = new CScript();
}
- txTmp.vin[nIn].scriptSig = scriptCode;
+ txTmp.vin[nIn].scriptSig = script;
// Blank out some of the outputs
if ((nHashType & 0x1f) == (int)sigflag.SIGHASH_NONE)
return Hash256.Compute256(b);
}
+ //
+ // Script is a stack machine (like Forth) that evaluates a predicate
+ // returning a bool indicating valid or not. There are no loops.
+ //
+
+ /// <summary>
+ /// Script machine exception
+ /// </summary>
public class StackMachineException : Exception
{
public StackMachineException()
}
}
-
- //
- // Script is a stack machine (like Forth) that evaluates a predicate
- // returning a bool indicating valid or not. There are no loops.
- //
-
/// <summary>
/// Remove last element from stack
/// </summary>
return new BigInteger(value.ToArray());
}
+ /// <summary>
+ /// Execution of script
+ /// </summary>
+ /// <param name="stack"></param>
+ /// <param name="script">Script to execute</param>
+ /// <param name="txTo">Transaction instance</param>
+ /// <param name="nIn">Input number</param>
+ /// <param name="flags">Signature checking flags</param>
+ /// <param name="nHashType">Hash type flag</param>
+ /// <returns></returns>
static bool EvalScript(ref List<IEnumerable<byte>> stack, CScript script, CTransaction txTo, int nIn, int flags, int nHashType)
{
instruction opcode;
case instruction.OP_16:
{
// ( -- value)
- BigInteger bn = DecodeOP_N(opcode);
+ BigInteger bn = DecodeOP_N(opcode, true);
stack.Add(bn.ToByteArray());
}
break;
case instruction.OP_NOP10:
{
// Just do nothing
- break;
}
+ break;
//
// Control
}
break;
-
//
// Crypto
//
{
// (in -- hash)
if (stack.Count() < 1)
- return false;
- IEnumerable<byte> vch = stacktop(ref stack, -1);
- IEnumerable<byte> vchHash = null;
- if (opcode == instruction.OP_RIPEMD160)
- {
- RIPEMD160 hash = RIPEMD160.Compute160(vch);
- vchHash = hash.hashBytes;
- }
- else if (opcode == instruction.OP_SHA1)
{
- SHA1 hash = SHA1.Compute1(vch);
- vchHash = hash.hashBytes;
- }
- else if (opcode == instruction.OP_SHA256)
- {
- SHA256 hash = SHA256.Compute256(vch);
- vchHash = hash.hashBytes;
- }
- else if (opcode == instruction.OP_HASH160)
- {
- Hash160 hash = Hash160.Compute160(vch);
- vchHash = hash.hashBytes;
+ return false;
}
- else if (opcode == instruction.OP_HASH256)
+ Hash hash = null;
+ IEnumerable<byte> data = stacktop(ref stack, -1);
+
+ switch (opcode)
{
- Hash256 hash = Hash256.Compute256(vch);
- vchHash = hash.hashBytes;
+ case instruction.OP_HASH160:
+ hash = Hash160.Compute160(data);
+ break;
+ case instruction.OP_HASH256:
+ hash = Hash256.Compute256(data);
+ break;
+ case instruction.OP_SHA1:
+ hash = SHA1.Compute1(data);
+ break;
+ case instruction.OP_SHA256:
+ hash = SHA256.Compute256(data);
+ break;
+ case instruction.OP_RIPEMD160:
+ hash = RIPEMD160.Compute160(data);
+ break;
}
popstack(ref stack);
- stack.Add(vchHash);
+ stack.Add(hash.hashBytes);
}
break;
return true;
}
- static bool CheckSig(IList<byte> vchSig, IList<byte> vchPubKey, CScript scriptCode, CTransaction txTo, int nIn, int nHashType, int flags)
+ /// <summary>
+ /// Check signature.
+ /// </summary>
+ /// <param name="sigBytes">Signature</param>
+ /// <param name="pubkeyBytes">Public key</param>
+ /// <param name="script">Spending script</param>
+ /// <param name="txTo">CTransaction instance</param>
+ /// <param name="nIn">Input number</param>
+ /// <param name="nHashType">Hashing type flag</param>
+ /// <param name="flags">Signature checking flags</param>
+ /// <returns></returns>
+ static bool CheckSig(IList<byte> sigBytes, IList<byte> pubkeyBytes, CScript script, CTransaction txTo, int nIn, int nHashType, int flags)
{
CPubKey pubkey;
{
// Trying to initialize the public key instance
- pubkey = new CPubKey(vchPubKey);
+ pubkey = new CPubKey(pubkeyBytes);
}
catch (Exception)
{
return false;
}
- if (vchSig.Count == 0)
+ if (sigBytes.Count == 0)
{
return false;
}
// Hash type is one byte tacked on to the end of the signature
if (nHashType == 0)
{
- nHashType = vchSig.Last();
+ nHashType = sigBytes.Last();
}
- else if (nHashType != vchSig.Last())
+ else if (nHashType != sigBytes.Last())
{
return false;
}
// Remove hash type
- vchSig.RemoveAt(vchSig.Count - 1);
+ sigBytes.RemoveAt(sigBytes.Count - 1);
- Hash256 sighash = SignatureHash(scriptCode, txTo, nIn, nHashType);
+ Hash256 sighash = SignatureHash(script, txTo, nIn, nHashType);
- if (!pubkey.VerifySignature(sighash, vchSig))
+ if (!pubkey.VerifySignature(sighash, sigBytes))
{
return false;
}
git://git.novaco.in / NovacoinLibrary.git / commitdiff