X-Git-Url: https://git.novaco.in/?a=blobdiff_plain;f=Novacoin%2FScriptCode.cs;h=ab0db3fe04b795a77ee2235f977dbb762da1528a;hb=1dcac5faa2b1477034f82466ffb16170fa2e9bb6;hp=c90bf87b871e45ce5d8e705f9068622d1a2657c8;hpb=5f1c284906c75b1c579357db468239d47c5b8707;p=NovacoinLibrary.git
diff --git a/Novacoin/ScriptCode.cs b/Novacoin/ScriptCode.cs
index c90bf87..ab0db3f 100644
--- a/Novacoin/ScriptCode.cs
+++ b/Novacoin/ScriptCode.cs
@@ -1,21 +1,24 @@
/**
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as
- * published by the Free Software Foundation, either version 3 of the
- * License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see .
+ * Novacoin classes library
+ * Copyright (C) 2015 Alex D. (balthazar.ad@gmail.com)
+
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see .
*/
using System;
using System.Collections.Generic;
+using System.Diagnostics.Contracts;
using System.Linq;
using System.Numerics;
using System.Text;
@@ -23,7 +26,7 @@ using System.Text;
namespace Novacoin
{
///
- /// Script opcodes
+ /// Script instructions
///
public enum instruction
{
@@ -223,10 +226,10 @@ namespace Novacoin
}
///
- /// Get the name of supplied opcode
+ /// Get the name of instruction
///
- /// Opcode
- /// Opcode name
+ /// Instruction
+ /// Instruction name
public static string GetOpName(instruction opcode)
{
if (opcode == instruction.OP_0) // OP_0 and OP_FALSE are synonyms
@@ -238,78 +241,67 @@ namespace Novacoin
}
///
- /// Get next opcode from passed list of bytes and extract push arguments if there are some.
+ /// Get next instruction from list of bytes and extract push arguments if there are some.
///
/// ByteQueue reference.
- /// Found opcode.
+ /// Found instruction.
/// IEnumerable out param which is used to get the push arguments.
/// Result of operation
- 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)
{
- byte[] szBytes = new byte[4] { 0, 0, 0, 0 }; // Zero length
+ var szBytes = new byte[4] { 0, 0, 0, 0 }; // Zero length
+ int nSize = 0;
try
{
if (opcode < instruction.OP_PUSHDATA1)
{
- // Zero value opcodes (OP_0, OP_FALSE)
- szBytes[3] = (byte)opcode;
+ // Zero value instructions (OP_0, OP_FALSE)
+ 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;
@@ -335,7 +327,7 @@ namespace Novacoin
if (bytes.Length <= 4)
{
- sb.Append(Interop.BEBytesToUInt32(bytes));
+ sb.Append(new BigInteger(bytes));
}
else
{
@@ -364,50 +356,43 @@ namespace Novacoin
///
/// Decode instruction to integer value
///
- /// Small integer opcode (OP_1_NEGATE and OP_0 - OP_16)
+ /// Small integer instruction (OP_1_NEGATE and OP_0 - OP_16)
/// Small integer
public static int DecodeOP_N(instruction opcode, bool AllowNegate = false)
{
- if (AllowNegate && opcode == instruction.OP_1NEGATE)
- {
- return -1;
- }
+ // Only OP_n instructions are supported, throw exception otherwise.
+ Contract.Requires((opcode == instruction.OP_1NEGATE && AllowNegate) || (opcode >= instruction.OP_0 && opcode <= instruction.OP_16), "Invalid integer instruction.");
- if (opcode == instruction.OP_0)
+ switch (opcode)
{
- return 0;
- }
-
- // Only OP_n opcodes are supported, throw exception otherwise.
- if (opcode < instruction.OP_1 || opcode > instruction.OP_16)
- {
- 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);
}
///
/// Converts integer into instruction
///
/// Small integer from the range of -1 up to 16.
- /// Corresponding opcode.
+ /// Corresponding instruction.
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((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 solutions)
@@ -477,6 +462,8 @@ namespace Novacoin
/// Result
public static bool Solver(CScript scriptPubKey, out txnouttype typeRet, out IList solutions)
{
+ byte[] scriptBytes = scriptPubKey;
+
solutions = new List();
// There are shortcuts for pay-to-script-hash and pay-to-pubkey-hash, which are more constrained than the other types.
@@ -487,7 +474,7 @@ namespace Novacoin
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;
@@ -499,7 +486,7 @@ namespace Novacoin
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;
@@ -520,7 +507,7 @@ namespace Novacoin
// Sender provides N pubkeys, receivers provides M signatures
// N [pubkey1] [pubkey2] ... [pubkeyN] M OP_CHECKMULTISIG
- // Where N and M are small integer opcodes (OP1 ... OP_16)
+ // Where N and M are small integer instructions (OP1 ... OP_16)
templateTuples.Add(
new Tuple(
txnouttype.TX_MULTISIG,
@@ -554,17 +541,17 @@ namespace Novacoin
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;
@@ -591,7 +578,7 @@ namespace Novacoin
break;
}
- // Template matching opcodes:
+ // Template matching instructions:
if (opcode2 == instruction.OP_PUBKEYS)
{
while (args1.Count() >= 33 && args1.Count() <= 120)
@@ -669,21 +656,16 @@ namespace Novacoin
/// Input number
/// Hash type flag
///
- public static Hash256 SignatureHash(CScript script, CTransaction txTo, int nIn, int nHashType)
+ public static uint256 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(nIn < txTo.vin.Length, "nIn out of range.");
// Init a copy of transaction
var 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.
- script.RemovePattern(new byte[] { (byte)instruction.OP_CODESEPARATOR });
+ script.RemoveInstruction(instruction.OP_CODESEPARATOR);
// Blank out other inputs' signatures
for (int i = 0; i < txTmp.vin.Length; i++)
@@ -742,10 +724,10 @@ namespace Novacoin
}
// Concatenate and hash
- var txBytes = txTmp.Bytes;
+ var txBytes = (byte[])txTmp;
var nHashTypeBytes = BitConverter.GetBytes(nHashType);
- return Hash256.Compute256(ref txBytes, ref nHashTypeBytes);
+ return CryptoUtils.ComputeHash256(ref txBytes, ref nHashTypeBytes);
}
//
@@ -756,6 +738,7 @@ namespace Novacoin
///
/// Script machine exception
///
+ [Serializable]
public class StackMachineException : Exception
{
public StackMachineException()
@@ -779,10 +762,9 @@ namespace Novacoin
/// Stack reference
private static void popstack(ref List stack)
{
- int nCount = stack.Count;
- if (nCount == 0)
- throw new StackMachineException("popstack() : stack empty");
- stack.RemoveAt(nCount - 1);
+ Contract.Requires(stack.Count > 0, "Stack is empty.");
+
+ stack.RemoveAt(stack.Count - 1);
}
///
@@ -793,25 +775,10 @@ namespace Novacoin
/// Byte sequence
private static byte[] stacktop(ref List 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(nDepth < 0, "Positive or zero stack depth makes no sense.");
+ Contract.Requires(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];
}
///
@@ -845,10 +812,7 @@ namespace Novacoin
///
private static BigInteger CastToBigInteger(byte[] value)
{
- if (value.Length > 4)
- {
- throw new StackMachineException("CastToBigInteger() : overflow");
- }
+ Contract.Requires(value.Length <= 4, "Size limit failed.");
return new BigInteger(value);
}
@@ -865,7 +829,9 @@ namespace Novacoin
///
public static bool EvalScript(ref List 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
}
@@ -878,11 +844,13 @@ namespace Novacoin
var falseBytes = new byte[0];
var trueBytes = new byte[] { 0x01 };
- var CodeQueue = script.GetByteQUeue();
+ var CodeQueue = script.GetInstructionQueue();
var altStack = new List();
+#if !DEBUG
try
{
+#endif
instruction opcode;
byte[] pushArg;
@@ -908,7 +876,7 @@ namespace Novacoin
switch (opcode)
{
//
- // Disabled opcodes
+ // Disabled instructions
//
case instruction.OP_CAT:
case instruction.OP_SUBSTR:
@@ -1524,36 +1492,36 @@ namespace Novacoin
{
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;
@@ -1566,11 +1534,11 @@ namespace Novacoin
return false;
}
- byte[] sigBytes = stacktop(ref stack, -2);
- byte[] pubkeyBytes = stacktop(ref stack, -1);
+ var sigBytes = stacktop(ref stack, -2);
+ var pubkeyBytes = stacktop(ref stack, -1);
// Subset of script starting at the most recent codeseparator
- CScript scriptCode = new CScript(script.Bytes.Skip(nCodeHashBegin));
+ var scriptCode = new CScript(scriptBytes.Skip(nCodeHashBegin).ToArray());
// There's no way for a signature to sign itself
scriptCode.RemovePattern(sigBytes);
@@ -1637,7 +1605,7 @@ namespace Novacoin
}
// Subset of script starting at the most recent codeseparator
- CScript scriptCode = new CScript(script.Bytes.Skip(nCodeHashBegin));
+ 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++)
@@ -1718,12 +1686,14 @@ namespace Novacoin
return false;
}
}
+#if !DEBUG
}
catch (Exception)
{
// If there are any exceptions then just return false.
return false;
}
+#endif
if (vfExec.Count() != 0)
{