using System;
using System.Collections.Generic;
+using System.Diagnostics.Contracts;
using System.Linq;
using System.Numerics;
using System.Text;
/// <param name="opcodeRet">Found instruction.</param>
/// <param name="bytesRet">IEnumerable out param which is used to get the push arguments.</param>
/// <returns>Result of operation</returns>
- public static bool GetOp(ref ByteQueue codeBytes, out instruction opcodeRet, out byte[] bytesRet)
+ public static bool GetOp(ref InstructionQueue codeBytes, out instruction opcodeRet, out byte[] bytesRet)
{
bytesRet = new byte[0];
- opcodeRet = instruction.OP_INVALIDOPCODE;
+ instruction opcode = opcodeRet = instruction.OP_INVALIDOPCODE;
- instruction opcode;
-
- try
+ // Read instruction
+ byte opVal = 0xff;
+ if (!codeBytes.TryGet(ref opVal))
{
- // Read instruction
- opcode = (instruction)codeBytes.Get();
- }
- catch (ByteQueueException)
- {
- // No instruction found there
return false;
}
+ opcode = (instruction)opVal;
// Immediate operand
if (opcode <= instruction.OP_PUSHDATA4)
{
var szBytes = new byte[4] { 0, 0, 0, 0 }; // Zero length
+ int nSize = 0;
try
{
if (opcode < instruction.OP_PUSHDATA1)
{
// Zero value instructions (OP_0, OP_FALSE)
- szBytes[3] = (byte)opcode;
+ nSize = (int) opcode;
}
else if (opcode == instruction.OP_PUSHDATA1)
{
// The next byte contains the number of bytes to be pushed onto the stack,
// i.e. you have something like OP_PUSHDATA1 0x01 [0x5a]
- szBytes[3] = codeBytes.Get();
+ nSize = codeBytes.Get();
}
else if (opcode == instruction.OP_PUSHDATA2)
{
// The next two bytes contain the number of bytes to be pushed onto the stack,
- // i.e. now your operation will seem like this: OP_PUSHDATA2 0x00 0x01 [0x5a]
- codeBytes.Get(2).CopyTo(szBytes, 2);
+ // i.e. now your operation will seem like this: OP_PUSHDATA2 0x01 0x00 [0x5a]
+ nSize = BitConverter.ToInt16(codeBytes.Get(2), 0);
}
else if (opcode == instruction.OP_PUSHDATA4)
{
// The next four bytes contain the number of bytes to be pushed onto the stack,
- // OP_PUSHDATA4 0x00 0x00 0x00 0x01 [0x5a]
- szBytes = codeBytes.Get(4);
+ // OP_PUSHDATA4 0x01 0x00 0x00 0x00 [0x5a]
+ nSize = BitConverter.ToInt32(codeBytes.Get(4), 0);
}
}
- catch (ByteQueueException)
+ catch (InstructionQueueException)
{
// Unable to read operand length
return false;
}
- int nSize = (int)Interop.BEBytesToUInt32(szBytes);
-
if (nSize > 0)
{
- // If nSize is greater than zero then there is some data available
- try
- {
- // Read found number of bytes into list of OP_PUSHDATAn arguments.
- bytesRet = codeBytes.Get(nSize);
- }
- catch (ByteQueueException)
+ // Trying to read found number of bytes into list of OP_PUSHDATAn arguments.
+ if (!codeBytes.TryGet(nSize, ref bytesRet))
{
// Unable to read data
return false;
if (bytes.Length <= 4)
{
- sb.Append(Interop.BEBytesToUInt32(bytes));
+ sb.Append(new BigInteger(bytes));
}
else
{
/// <returns>Small integer</returns>
public static int DecodeOP_N(instruction opcode, bool AllowNegate = false)
{
- if (AllowNegate && opcode == instruction.OP_1NEGATE)
- {
- return -1;
- }
-
- if (opcode == instruction.OP_0)
- {
- return 0;
- }
-
// Only OP_n instructions are supported, throw exception otherwise.
- if (opcode < instruction.OP_1 || opcode > instruction.OP_16)
+ Contract.Requires<ArgumentException>((opcode == instruction.OP_1NEGATE && AllowNegate) || (opcode >= instruction.OP_0 && opcode <= instruction.OP_16), "Invalid integer instruction.");
+
+ switch (opcode)
{
- throw new ArgumentException("Invalid integer instruction.");
+ case instruction.OP_1NEGATE:
+ return -1;
+ case instruction.OP_0:
+ return 0;
+ default:
+ return (int)opcode - (int)(instruction.OP_1 - 1);
}
-
- return (int)opcode - (int)(instruction.OP_1 - 1);
}
/// <summary>
/// <returns>Corresponding instruction.</returns>
public static instruction EncodeOP_N(int n, bool allowNegate = false)
{
- if (allowNegate && n == -1)
- {
- return instruction.OP_1NEGATE;
- }
+ // The n value must be in the range of 1 to 16.
+ Contract.Requires<ArgumentException>((n == -1 && allowNegate) || (n >= 0 && n <= 16), "Invalid integer value.");
- if (n == 0)
+ switch (n)
{
- return instruction.OP_0;
+ case -1:
+ return instruction.OP_1NEGATE;
+ case 0:
+ return instruction.OP_0;
+ default:
+ return (instruction.OP_1 + n - 1);
}
-
- // The n value must be in the range of 0 to 16.
- if (n < 0 || n > 16)
- throw new ArgumentException("Invalid integer value.");
- return (instruction.OP_1 + n - 1);
}
public static int ScriptSigArgsExpected(txnouttype t, IList<byte[]> solutions)
/// <returns>Result</returns>
public static bool Solver(CScript scriptPubKey, out txnouttype typeRet, out IList<byte[]> solutions)
{
+ byte[] scriptBytes = scriptPubKey;
+
solutions = new List<byte[]>();
// There are shortcuts for pay-to-script-hash and pay-to-pubkey-hash, which are more constrained than the other types.
typeRet = txnouttype.TX_SCRIPTHASH;
// Take 20 bytes with offset of 2 bytes
- var hashBytes = scriptPubKey.Bytes.Skip(2).Take(20);
+ var hashBytes = scriptBytes.Skip(2).Take(20);
solutions.Add(hashBytes.ToArray());
return true;
typeRet = txnouttype.TX_PUBKEYHASH;
// Take 20 bytes with offset of 3 bytes
- var hashBytes = scriptPubKey.Bytes.Skip(3).Take(20);
+ var hashBytes = scriptBytes.Skip(3).Take(20);
solutions.Add(hashBytes.ToArray());
return true;
instruction opcode1, opcode2;
// Compare
- var bq1 = script1.GetByteQUeue();
- var bq2 = script2.GetByteQUeue();
+ var bq1 = script1.GetInstructionQueue();
+ var bq2 = script2.GetInstructionQueue();
byte[] args1, args2;
- int last1 = script1.Bytes.Count() -1;
- int last2 = script2.Bytes.Count() - 1;
+ int last1 = ((byte[])script1).Length - 1;
+ int last2 = ((byte[])script2).Length - 1;
while (true)
{
- if (bq1.CurrentIndex == last1 && bq2.CurrentIndex == last2)
+ if (bq1.Index == last1 && bq2.Index == last2)
{
// Found a match
typeRet = templateTuple.Item1;
/// <returns></returns>
public static Hash256 SignatureHash(CScript script, CTransaction txTo, int nIn, int nHashType)
{
- if (nIn >= txTo.vin.Length)
- {
- var sb = new StringBuilder();
- sb.AppendFormat("ERROR: SignatureHash() : nIn={0} out of range\n", nIn);
- throw new ArgumentOutOfRangeException("nIn", sb.ToString());
- }
+ Contract.Requires<ArgumentOutOfRangeException>(nIn < txTo.vin.Length, "nIn out of range.");
// Init a copy of transaction
var txTmp = new CTransaction(txTo);
}
// Concatenate and hash
- var txBytes = txTmp.Bytes;
+ var txBytes = (byte[])txTmp;
var nHashTypeBytes = BitConverter.GetBytes(nHashType);
return Hash256.Compute256(ref txBytes, ref nHashTypeBytes);
/// <summary>
/// Script machine exception
/// </summary>
+ [Serializable]
public class StackMachineException : Exception
{
public StackMachineException()
/// <param name="stack">Stack reference</param>
private static void popstack(ref List<byte[]> stack)
{
- int nCount = stack.Count;
- if (nCount == 0)
- throw new StackMachineException("popstack() : stack empty");
- stack.RemoveAt(nCount - 1);
+ Contract.Requires<StackMachineException>(stack.Count > 0, "Stack is empty.");
+
+ stack.RemoveAt(stack.Count - 1);
}
/// <summary>
/// <returns>Byte sequence</returns>
private static byte[] stacktop(ref List<byte[]> stack, int nDepth)
{
- int nStackElement = stack.Count + nDepth;
-
- if (nDepth >= 0)
- {
- StringBuilder sb = new StringBuilder();
- sb.AppendFormat("stacktop() : positive depth ({0}) has no sense.", nDepth);
+ Contract.Requires<StackMachineException>(nDepth < 0, "Positive or zero stack depth makes no sense.");
+ Contract.Requires<StackMachineException>(stack.Count + nDepth >= 0, "Value exceeds real stack depth.");
- throw new StackMachineException(sb.ToString());
- }
-
- if (nStackElement < 0)
- {
- StringBuilder sb = new StringBuilder();
- sb.AppendFormat("stacktop() : nDepth={0} exceeds real stack depth ({1})", nDepth, stack.Count);
-
- throw new StackMachineException(sb.ToString());
- }
-
- return stack[nStackElement];
+ return stack[stack.Count + nDepth];
}
/// <summary>
/// <returns></returns>
private static BigInteger CastToBigInteger(byte[] value)
{
- if (value.Length > 4)
- {
- throw new StackMachineException("CastToBigInteger() : overflow");
- }
+ Contract.Requires<StackMachineException>(value.Length <= 4, "Size limit failed.");
return new BigInteger(value);
}
/// <returns></returns>
public static bool EvalScript(ref List<byte[]> stack, CScript script, CTransaction txTo, int nIn, int flags, int nHashType)
{
- if (script.Bytes.Count() > 10000)
+ var scriptBytes = ((byte[])script);
+
+ if (scriptBytes.Length > 10000)
{
return false; // Size limit failed
}
var falseBytes = new byte[0];
var trueBytes = new byte[] { 0x01 };
- var CodeQueue = script.GetByteQUeue();
+ var CodeQueue = script.GetInstructionQueue();
var altStack = new List<byte[]>();
+#if !DEBUG
try
{
+#endif
instruction opcode;
byte[] pushArg;
{
return false;
}
- Hash hash = null;
+ byte[] hash = null;
var data = stacktop(ref stack, -1);
switch (opcode)
{
case instruction.OP_HASH160:
- hash = Hash160.Compute160(data);
+ hash = CryptoUtils.ComputeHash160(data);
break;
case instruction.OP_HASH256:
- hash = Hash256.Compute256(data);
+ hash = CryptoUtils.ComputeHash256(data);
break;
case instruction.OP_SHA1:
- hash = SHA1.Compute1(data);
+ hash = CryptoUtils.ComputeSha1(data);
break;
case instruction.OP_SHA256:
- hash = SHA256.Compute256(data);
+ hash = CryptoUtils.ComputeSha256(data);
break;
case instruction.OP_RIPEMD160:
- hash = RIPEMD160.Compute160(data);
+ hash = CryptoUtils.ComputeRipeMD160(data);
break;
}
popstack(ref stack);
- stack.Add(hash.hashBytes);
+ stack.Add(hash);
}
break;
case instruction.OP_CODESEPARATOR:
{
// Hash starts after the code separator
- nCodeHashBegin = CodeQueue.CurrentIndex;
+ nCodeHashBegin = CodeQueue.Index;
}
break;
var pubkeyBytes = stacktop(ref stack, -1);
// Subset of script starting at the most recent codeseparator
- var scriptCode = new CScript(script.Bytes.Skip(nCodeHashBegin).ToArray());
+ var scriptCode = new CScript(scriptBytes.Skip(nCodeHashBegin).ToArray());
// There's no way for a signature to sign itself
scriptCode.RemovePattern(sigBytes);
}
// Subset of script starting at the most recent codeseparator
- var scriptCode = new CScript(script.Bytes.Skip(nCodeHashBegin).ToArray());
+ var scriptCode = new CScript(scriptBytes.Skip(nCodeHashBegin).ToArray());
// There is no way for a signature to sign itself, so we need to drop the signatures
for (int k = 0; k < nSigsCount; k++)
return false;
}
}
+#if !DEBUG
}
catch (Exception)
{
// If there are any exceptions then just return false.
return false;
}
+#endif
if (vfExec.Count() != 0)
{
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