X-Git-Url: https://git.novaco.in/?a=blobdiff_plain;f=Novacoin%2FScriptCode.cs;h=df1d773942836800b399a139d3e551a9ecd8da54;hb=031d9e2250687721838d86647625a6c949f91de6;hp=597079440c817eb44a6ac5f1a9e7823549ba620d;hpb=a4f54704ae3d27f126af4c362ddd7cf4b9fdce80;p=NovacoinLibrary.git
diff --git a/Novacoin/ScriptCode.cs b/Novacoin/ScriptCode.cs
index 5970794..df1d773 100644
--- a/Novacoin/ScriptCode.cs
+++ b/Novacoin/ScriptCode.cs
@@ -1,14 +1,34 @@
+/**
+ * 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;
namespace Novacoin
{
///
- /// Script opcodes
+ /// Script instructions
///
- public enum opcodetype
+ public enum instruction
{
// push value
OP_0 = 0x00,
@@ -178,6 +198,17 @@ namespace Novacoin
SIGHASH_ANYONECANPAY = 0x80,
};
+ /** Script verification flags */
+ public enum scriptflag
+ {
+ SCRIPT_VERIFY_NONE = 0,
+ SCRIPT_VERIFY_P2SH = (1 << 0), // evaluate P2SH (BIP16) subscripts
+ SCRIPT_VERIFY_STRICTENC = (1 << 1), // enforce strict conformance to DER and SEC2 for signatures and pubkeys
+ SCRIPT_VERIFY_LOW_S = (1 << 2), // enforce low S values in signatures (depends on STRICTENC)
+ SCRIPT_VERIFY_NOCACHE = (1 << 3), // do not store results in signature cache (but do query it)
+ SCRIPT_VERIFY_NULLDUMMY = (1 << 4), // verify dummy stack item consumed by CHECKMULTISIG is of zero-length
+ };
+
public static class ScriptCode
{
public static string GetTxnOutputType(txnouttype t)
@@ -195,340 +226,82 @@ namespace Novacoin
}
///
- /// Get the name of supplied opcode
+ /// Get the name of instruction
///
- /// Opcode
- /// Opcode name
- public static string GetOpName(opcodetype opcode)
+ /// Instruction
+ /// Instruction name
+ public static string GetOpName(instruction opcode)
{
- switch (opcode)
- {
- // push value
- case opcodetype.OP_0:
- return "0";
- case opcodetype.OP_PUSHDATA1:
- return "OP_PUSHDATA1";
- case opcodetype.OP_PUSHDATA2:
- return "OP_PUSHDATA2";
- case opcodetype.OP_PUSHDATA4:
- return "OP_PUSHDATA4";
- case opcodetype.OP_1NEGATE:
- return "-1";
- case opcodetype.OP_RESERVED:
- return "OP_RESERVED";
- case opcodetype.OP_1:
- return "1";
- case opcodetype.OP_2:
- return "2";
- case opcodetype.OP_3:
- return "3";
- case opcodetype.OP_4:
- return "4";
- case opcodetype.OP_5:
- return "5";
- case opcodetype.OP_6:
- return "6";
- case opcodetype.OP_7:
- return "7";
- case opcodetype.OP_8:
- return "8";
- case opcodetype.OP_9:
- return "9";
- case opcodetype.OP_10:
- return "10";
- case opcodetype.OP_11:
- return "11";
- case opcodetype.OP_12:
- return "12";
- case opcodetype.OP_13:
- return "13";
- case opcodetype.OP_14:
- return "14";
- case opcodetype.OP_15:
- return "15";
- case opcodetype.OP_16:
- return "16";
-
- // control
- case opcodetype.OP_NOP:
- return "OP_NOP";
- case opcodetype.OP_VER:
- return "OP_VER";
- case opcodetype.OP_IF:
- return "OP_IF";
- case opcodetype.OP_NOTIF:
- return "OP_NOTIF";
- case opcodetype.OP_VERIF:
- return "OP_VERIF";
- case opcodetype.OP_VERNOTIF:
- return "OP_VERNOTIF";
- case opcodetype.OP_ELSE:
- return "OP_ELSE";
- case opcodetype.OP_ENDIF:
- return "OP_ENDIF";
- case opcodetype.OP_VERIFY:
- return "OP_VERIFY";
- case opcodetype.OP_RETURN:
- return "OP_RETURN";
-
- // stack ops
- case opcodetype.OP_TOALTSTACK:
- return "OP_TOALTSTACK";
- case opcodetype.OP_FROMALTSTACK:
- return "OP_FROMALTSTACK";
- case opcodetype.OP_2DROP:
- return "OP_2DROP";
- case opcodetype.OP_2DUP:
- return "OP_2DUP";
- case opcodetype.OP_3DUP:
- return "OP_3DUP";
- case opcodetype.OP_2OVER:
- return "OP_2OVER";
- case opcodetype.OP_2ROT:
- return "OP_2ROT";
- case opcodetype.OP_2SWAP:
- return "OP_2SWAP";
- case opcodetype.OP_IFDUP:
- return "OP_IFDUP";
- case opcodetype.OP_DEPTH:
- return "OP_DEPTH";
- case opcodetype.OP_DROP:
- return "OP_DROP";
- case opcodetype.OP_DUP:
- return "OP_DUP";
- case opcodetype.OP_NIP:
- return "OP_NIP";
- case opcodetype.OP_OVER:
- return "OP_OVER";
- case opcodetype.OP_PICK:
- return "OP_PICK";
- case opcodetype.OP_ROLL:
- return "OP_ROLL";
- case opcodetype.OP_ROT:
- return "OP_ROT";
- case opcodetype.OP_SWAP:
- return "OP_SWAP";
- case opcodetype.OP_TUCK:
- return "OP_TUCK";
-
- // splice ops
- case opcodetype.OP_CAT:
- return "OP_CAT";
- case opcodetype.OP_SUBSTR:
- return "OP_SUBSTR";
- case opcodetype.OP_LEFT:
- return "OP_LEFT";
- case opcodetype.OP_RIGHT:
- return "OP_RIGHT";
- case opcodetype.OP_SIZE:
- return "OP_SIZE";
-
- // bit logic
- case opcodetype.OP_INVERT:
- return "OP_INVERT";
- case opcodetype.OP_AND:
- return "OP_AND";
- case opcodetype.OP_OR:
- return "OP_OR";
- case opcodetype.OP_XOR:
- return "OP_XOR";
- case opcodetype.OP_EQUAL:
- return "OP_EQUAL";
- case opcodetype.OP_EQUALVERIFY:
- return "OP_EQUALVERIFY";
- case opcodetype.OP_RESERVED1:
- return "OP_RESERVED1";
- case opcodetype.OP_RESERVED2:
- return "OP_RESERVED2";
-
- // numeric
- case opcodetype.OP_1ADD:
- return "OP_1ADD";
- case opcodetype.OP_1SUB:
- return "OP_1SUB";
- case opcodetype.OP_2MUL:
- return "OP_2MUL";
- case opcodetype.OP_2DIV:
- return "OP_2DIV";
- case opcodetype.OP_NEGATE:
- return "OP_NEGATE";
- case opcodetype.OP_ABS:
- return "OP_ABS";
- case opcodetype.OP_NOT:
- return "OP_NOT";
- case opcodetype.OP_0NOTEQUAL:
- return "OP_0NOTEQUAL";
- case opcodetype.OP_ADD:
- return "OP_ADD";
- case opcodetype.OP_SUB:
- return "OP_SUB";
- case opcodetype.OP_MUL:
- return "OP_MUL";
- case opcodetype.OP_DIV:
- return "OP_DIV";
- case opcodetype.OP_MOD:
- return "OP_MOD";
- case opcodetype.OP_LSHIFT:
- return "OP_LSHIFT";
- case opcodetype.OP_RSHIFT:
- return "OP_RSHIFT";
- case opcodetype.OP_BOOLAND:
- return "OP_BOOLAND";
- case opcodetype.OP_BOOLOR:
- return "OP_BOOLOR";
- case opcodetype.OP_NUMEQUAL:
- return "OP_NUMEQUAL";
- case opcodetype.OP_NUMEQUALVERIFY:
- return "OP_NUMEQUALVERIFY";
- case opcodetype.OP_NUMNOTEQUAL:
- return "OP_NUMNOTEQUAL";
- case opcodetype.OP_LESSTHAN:
- return "OP_LESSTHAN";
- case opcodetype.OP_GREATERTHAN:
- return "OP_GREATERTHAN";
- case opcodetype.OP_LESSTHANOREQUAL:
- return "OP_LESSTHANOREQUAL";
- case opcodetype.OP_GREATERTHANOREQUAL:
- return "OP_GREATERTHANOREQUAL";
- case opcodetype.OP_MIN:
- return "OP_MIN";
- case opcodetype.OP_MAX:
- return "OP_MAX";
- case opcodetype.OP_WITHIN:
- return "OP_WITHIN";
-
- // crypto
- case opcodetype.OP_RIPEMD160:
- return "OP_RIPEMD160";
- case opcodetype.OP_SHA1:
- return "OP_SHA1";
- case opcodetype.OP_SHA256:
- return "OP_SHA256";
- case opcodetype.OP_HASH160:
- return "OP_HASH160";
- case opcodetype.OP_HASH256:
- return "OP_HASH256";
- case opcodetype.OP_CODESEPARATOR:
- return "OP_CODESEPARATOR";
- case opcodetype.OP_CHECKSIG:
- return "OP_CHECKSIG";
- case opcodetype.OP_CHECKSIGVERIFY:
- return "OP_CHECKSIGVERIFY";
- case opcodetype.OP_CHECKMULTISIG:
- return "OP_CHECKMULTISIG";
- case opcodetype.OP_CHECKMULTISIGVERIFY:
- return "OP_CHECKMULTISIGVERIFY";
-
- // expansion
- case opcodetype.OP_NOP1:
- return "OP_NOP1";
- case opcodetype.OP_NOP2:
- return "OP_NOP2";
- case opcodetype.OP_NOP3:
- return "OP_NOP3";
- case opcodetype.OP_NOP4:
- return "OP_NOP4";
- case opcodetype.OP_NOP5:
- return "OP_NOP5";
- case opcodetype.OP_NOP6:
- return "OP_NOP6";
- case opcodetype.OP_NOP7:
- return "OP_NOP7";
- case opcodetype.OP_NOP8:
- return "OP_NOP8";
- case opcodetype.OP_NOP9:
- return "OP_NOP9";
- case opcodetype.OP_NOP10:
- return "OP_NOP10";
-
- // template matching params
- case opcodetype.OP_PUBKEYHASH:
- return "OP_PUBKEYHASH";
- case opcodetype.OP_PUBKEY:
- return "OP_PUBKEY";
- case opcodetype.OP_SMALLDATA:
- return "OP_SMALLDATA";
-
- case opcodetype.OP_INVALIDOPCODE:
- return "OP_INVALIDOPCODE";
- default:
- return "OP_UNKNOWN";
- }
+ if (opcode == instruction.OP_0) // OP_0 and OP_FALSE are synonyms
+ return "OP_0";
+ if (opcode == instruction.OP_1) // OP_1 and OP_TRUE are synonyms
+ return "OP_1";
+
+ return Enum.GetName(typeof(instruction), opcode);
}
///
- /// 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 opcodetype opcodeRet, out IEnumerable bytesRet)
+ public static bool GetOp(ref InstructionQueue codeBytes, out instruction opcodeRet, out byte[] bytesRet)
{
- bytesRet = new List();
- opcodeRet = opcodetype.OP_INVALIDOPCODE;
+ bytesRet = new byte[0];
+ instruction opcode = opcodeRet = instruction.OP_INVALIDOPCODE;
- opcodetype opcode;
-
- try
+ // Read instruction
+ byte opVal = 0xff;
+ if (!codeBytes.TryGet(ref opVal))
{
- // Read instruction
- opcode = (opcodetype)codeBytes.Get();
- }
- catch (WrappedListException)
- {
- // No instruction found there
return false;
}
+ opcode = (instruction)opVal;
// Immediate operand
- if (opcode <= opcodetype.OP_PUSHDATA4)
+ 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 < opcodetype.OP_PUSHDATA1)
+ 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 == opcodetype.OP_PUSHDATA1)
+ 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] = (byte)codeBytes.Get();
+ nSize = codeBytes.Get();
}
- else if (opcode == opcodetype.OP_PUSHDATA2)
+ 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 == opcodetype.OP_PUSHDATA4)
+ 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 (WrappedListException)
+ 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.GetEnumerable(nSize);
- }
- catch (WrappedListException)
+ // 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;
@@ -548,16 +321,13 @@ namespace Novacoin
///
/// Collection of value bytes.
/// Formatted value.
- public static string ValueString(IEnumerable bytes)
+ public static string ValueString(byte[] bytes)
{
- StringBuilder sb = new StringBuilder();
+ var sb = new StringBuilder();
- if (bytes.Count() <= 4)
+ if (bytes.Length <= 4)
{
- byte[] valueBytes = new byte[4] { 0, 0, 0, 0 };
- bytes.ToArray().CopyTo(valueBytes, valueBytes.Length - bytes.Count());
-
- sb.Append(Interop.BEBytesToUInt32(valueBytes));
+ sb.Append(new BigInteger(bytes));
}
else
{
@@ -572,49 +342,60 @@ namespace Novacoin
///
/// List of stack items.
/// Formatted value.
- public static string StackString(IList> stackList)
+ public static string StackString(IList stackList)
{
- StringBuilder sb = new StringBuilder();
- foreach (IList bytesList in stackList)
+ var sb = new StringBuilder();
+ foreach (var bytes in stackList)
{
- sb.Append(ValueString(bytesList));
+ sb.Append(ValueString(bytes));
}
return sb.ToString();
}
///
- /// Decode small integer
+ /// Decode instruction to integer value
///
- /// Small integer opcode (OP_0 - OP_16)
+ /// Small integer instruction (OP_1_NEGATE and OP_0 - OP_16)
/// Small integer
- public static int DecodeOP_N(opcodetype opcode)
+ public static int DecodeOP_N(instruction opcode, bool AllowNegate = false)
{
- if (opcode == opcodetype.OP_0)
- return 0;
+ // 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.");
- // Only OP_n opcodes are supported, throw exception otherwise.
- if (opcode < opcodetype.OP_1 || opcode > opcodetype.OP_16)
- throw new Exception("Invalid small integer opcode.");
- return (int)opcode - (int)(opcodetype.OP_1 - 1);
+ switch (opcode)
+ {
+ case instruction.OP_1NEGATE:
+ return -1;
+ case instruction.OP_0:
+ return 0;
+ default:
+ return (int)opcode - (int)(instruction.OP_1 - 1);
+ }
}
///
- /// Converts small integer into opcode
+ /// Converts integer into instruction
///
- /// Small integer from the range of 0 up to 16.
- /// Corresponding opcode.
- public static opcodetype EncodeOP_N(int n)
+ /// Small integer from the range of -1 up to 16.
+ /// Corresponding instruction.
+ public static instruction EncodeOP_N(int n, bool allowNegate = false)
{
- // The n value must be in the range of 0 to 16.
- if (n < 0 || n > 16)
- throw new Exception("Invalid small integer value.");
- if (n == 0)
- return opcodetype.OP_0;
- return (opcodetype)(opcodetype.OP_1 + n - 1);
+ // The n value must be in the range of 1 to 16.
+ Contract.Requires((n == -1 && allowNegate) || (n >= 0 && n <= 16), "Invalid integer value.");
+
+ switch (n)
+ {
+ case -1:
+ return instruction.OP_1NEGATE;
+ case 0:
+ return instruction.OP_0;
+ default:
+ return (instruction.OP_1 + n - 1);
+ }
}
- public static int ScriptSigArgsExpected(txnouttype t, IList> solutions)
+ public static int ScriptSigArgsExpected(txnouttype t, IList solutions)
{
switch (t)
{
@@ -627,9 +408,9 @@ namespace Novacoin
case txnouttype.TX_PUBKEYHASH:
return 2;
case txnouttype.TX_MULTISIG:
- if (solutions.Count() < 1 || solutions.First().Count() < 1)
+ if (solutions.Count < 1 || solutions.First().Length < 1)
return -1;
- return solutions.First().First() + 1;
+ return solutions.First()[0] + 1;
case txnouttype.TX_SCRIPTHASH:
return 1; // doesn't include args needed by the script
}
@@ -644,7 +425,7 @@ namespace Novacoin
/// Checking result
public static bool IsStandard(CScript scriptPubKey, out txnouttype whichType)
{
- IList> solutions = new List>();
+ IList solutions;
if (!Solver(scriptPubKey, out whichType, out solutions))
{
@@ -655,8 +436,8 @@ namespace Novacoin
if (whichType == txnouttype.TX_MULTISIG)
{
// Additional verification of OP_CHECKMULTISIG arguments
- byte m = solutions.First().First();
- byte n = solutions.Last().First();
+ var m = solutions.First()[0];
+ var n = solutions.Last()[0];
// Support up to x-of-3 multisig txns as standard
if (n < 1 || n > 3)
@@ -679,11 +460,13 @@ namespace Novacoin
/// Output type
/// Set of solutions
/// Result
- public static bool Solver(CScript scriptPubKey, out txnouttype typeRet, out IList> solutions)
+ public static bool Solver(CScript scriptPubKey, out txnouttype typeRet, out IList solutions)
{
- solutions = new List>();
+ byte[] scriptBytes = scriptPubKey;
- // There are shortcuts for pay-to-script-hash and pay-to-pubkey-hash, which are more constrained than the other types:
+ solutions = new List();
+
+ // There are shortcuts for pay-to-script-hash and pay-to-pubkey-hash, which are more constrained than the other types.
// It is always OP_HASH160 20 [20 byte hash] OP_EQUAL
if (scriptPubKey.IsPayToScriptHash)
@@ -691,8 +474,8 @@ namespace Novacoin
typeRet = txnouttype.TX_SCRIPTHASH;
// Take 20 bytes with offset of 2 bytes
- IEnumerable hashBytes = scriptPubKey.Bytes.Skip(2).Take(20);
- solutions.Add(hashBytes);
+ var hashBytes = scriptBytes.Skip(2).Take(20);
+ solutions.Add(hashBytes.ToArray());
return true;
}
@@ -703,69 +486,80 @@ namespace Novacoin
typeRet = txnouttype.TX_PUBKEYHASH;
// Take 20 bytes with offset of 3 bytes
- IEnumerable hashBytes = scriptPubKey.Bytes.Skip(3).Take(20);
- solutions.Add(hashBytes);
+ var hashBytes = scriptBytes.Skip(3).Take(20);
+ solutions.Add(hashBytes.ToArray());
return true;
}
- List>> templateTuples = new List>>();
+ var templateTuples = new List>();
// Sender provides pubkey, receiver adds signature
// [ECDSA public key] OP_CHECKSIG
templateTuples.Add(
- new Tuple>(
+ new Tuple(
txnouttype.TX_PUBKEY,
- new byte[] { (byte)opcodetype.OP_PUBKEY, (byte)opcodetype.OP_CHECKSIG })
+ new byte[] {
+ (byte)instruction.OP_PUBKEY,
+ (byte)instruction.OP_CHECKSIG
+ })
);
// 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>(
+ new Tuple(
txnouttype.TX_MULTISIG,
- new byte[] { (byte)opcodetype.OP_SMALLINTEGER, (byte)opcodetype.OP_PUBKEYS, (byte)opcodetype.OP_SMALLINTEGER, (byte)opcodetype.OP_CHECKMULTISIG })
+ new byte[] {
+ (byte)instruction.OP_SMALLINTEGER,
+ (byte)instruction.OP_PUBKEYS,
+ (byte)instruction.OP_SMALLINTEGER,
+ (byte)instruction.OP_CHECKMULTISIG
+ })
);
// Data-carrying output
// OP_RETURN [up to 80 bytes of data]
templateTuples.Add(
- new Tuple>(
+ new Tuple(
txnouttype.TX_NULL_DATA,
- new byte[] { (byte)opcodetype.OP_RETURN, (byte)opcodetype.OP_SMALLDATA })
+ new byte[] {
+ (byte)instruction.OP_RETURN,
+ (byte)instruction.OP_SMALLDATA
+ })
);
// Nonstandard tx output
typeRet = txnouttype.TX_NONSTANDARD;
- foreach (Tuple> templateTuple in templateTuples)
+ foreach (var templateTuple in templateTuples)
{
- CScript script1 = scriptPubKey;
- CScript script2 = new CScript(templateTuple.Item2);
+ var script1 = scriptPubKey;
+ var script2 = new CScript(templateTuple.Item2);
- opcodetype opcode1, opcode2;
+ instruction opcode1, opcode2;
// Compare
- ByteQueue wl1 = script1.GetWrappedList();
- ByteQueue wl2 = script2.GetWrappedList();
+ var bq1 = script1.GetInstructionQueue();
+ var bq2 = script2.GetInstructionQueue();
- IEnumerable args1, args2;
+ byte[] args1, args2;
- byte last1 = script1.Bytes.Last();
- byte last2 = script2.Bytes.Last();
+ int last1 = ((byte[])script1).Length - 1;
+ int last2 = ((byte[])script2).Length - 1;
while (true)
{
- if (wl1.GetCurrent() == last1 && wl2.GetCurrent() == last2)
+ if (bq1.Index == last1 && bq2.Index == last2)
{
// Found a match
typeRet = templateTuple.Item1;
if (typeRet == txnouttype.TX_MULTISIG)
{
// Additional checks for TX_MULTISIG:
- byte m = solutions.First().First();
- byte n = solutions.Last().First();
+ var m = solutions.First().First();
+ var n = solutions.Last().First();
if (m < 1 || n < 1 || m > n || solutions.Count - 2 != n)
{
@@ -775,40 +569,43 @@ namespace Novacoin
return true;
}
- if (!GetOp(ref wl1, out opcode1, out args1))
+ if (!GetOp(ref bq1, out opcode1, out args1))
{
break;
}
- if (!GetOp(ref wl2, out opcode2, out args2))
+ if (!GetOp(ref bq2, out opcode2, out args2))
{
break;
}
- // Template matching opcodes:
- if (opcode2 == opcodetype.OP_PUBKEYS)
+ // Template matching instructions:
+ if (opcode2 == instruction.OP_PUBKEYS)
{
while (args1.Count() >= 33 && args1.Count() <= 120)
{
solutions.Add(args1);
- if (!GetOp(ref wl1, out opcode1, out args1))
+ if (!GetOp(ref bq1, out opcode1, out args1))
{
break;
}
}
- if (!GetOp(ref wl2, out opcode2, out args2))
+ if (!GetOp(ref bq2, out opcode2, out args2))
+ {
break;
+ }
// Normal situation is to fall through
// to other if/else statements
}
- if (opcode2 == opcodetype.OP_PUBKEY)
+ if (opcode2 == instruction.OP_PUBKEY)
{
- if (args1.Count() < 33 || args1.Count() > 120)
+ int PubKeyLen = args1.Count();
+ if (PubKeyLen < 33 || PubKeyLen > 120)
{
break;
}
solutions.Add(args1);
}
- else if (opcode2 == opcodetype.OP_PUBKEYHASH)
+ else if (opcode2 == instruction.OP_PUBKEYHASH)
{
if (args1.Count() != 20) // hash160 size
{
@@ -816,23 +613,23 @@ namespace Novacoin
}
solutions.Add(args1);
}
- else if (opcode2 == opcodetype.OP_SMALLINTEGER)
+ else if (opcode2 == instruction.OP_SMALLINTEGER)
{
// Single-byte small integer pushed onto solutions
- if (opcode1 == opcodetype.OP_0 || (opcode1 >= opcodetype.OP_1 && opcode1 <= opcodetype.OP_16))
+ try
{
- byte n = (byte)DecodeOP_N(opcode1);
+ var n = (byte)DecodeOP_N(opcode1);
solutions.Add(new byte[] { n });
}
- else
+ catch (Exception)
{
break;
}
}
- else if (opcode2 == opcodetype.OP_SMALLDATA)
+ else if (opcode2 == instruction.OP_SMALLDATA)
{
// small pushdata, <= 80 bytes
- if (args1.Count() > 80)
+ if (args1.Length > 80)
{
break;
}
@@ -851,27 +648,31 @@ namespace Novacoin
return false;
}
- public static Hash256 SignatureHash(CScript scriptCode, CTransaction txTo, int nIn, int nHashType)
+ ///
+ /// Generation of SignatureHash. This method is responsible for removal of transaction metadata. It's necessary signature can't sign itself.
+ ///
+ /// Spending instructions
+ /// Instance of transaction
+ /// Input number
+ /// Hash type flag
+ ///
+ public static Hash256 SignatureHash(CScript script, CTransaction txTo, int nIn, int nHashType)
{
- if (nIn >= txTo.vin.Length)
- {
- StringBuilder 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.");
- CTransaction txTmp = new CTransaction(txTo);
+ // 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.
- scriptCode.RemovePattern(new byte[] { (byte)opcodetype.OP_CODESEPARATOR });
+ script.RemoveInstruction(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)
@@ -922,14 +723,22 @@ namespace Novacoin
Array.Resize(ref txTmp.vin, 1);
}
- // Serialize and hash
- List b = new List();
- b.AddRange(txTmp.Bytes);
- b.AddRange(BitConverter.GetBytes(nHashType));
+ // Concatenate and hash
+ var txBytes = (byte[])txTmp;
+ var nHashTypeBytes = BitConverter.GetBytes(nHashType);
- return Hash256.Compute256(b);
+ return Hash256.Compute256(ref txBytes, ref nHashTypeBytes);
}
+ //
+ // Script is a stack machine (like Forth) that evaluates a predicate
+ // returning a bool indicating valid or not. There are no loops.
+ //
+
+ ///
+ /// Script machine exception
+ ///
+ [Serializable]
public class StackMachineException : Exception
{
public StackMachineException()
@@ -947,22 +756,15 @@ namespace Novacoin
}
}
-
- //
- // Script is a stack machine (like Forth) that evaluates a predicate
- // returning a bool indicating valid or not. There are no loops.
- //
-
///
/// Remove last element from stack
///
/// Stack reference
- static void popstack(ref List> stack)
+ 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);
}
///
@@ -971,30 +773,1094 @@ namespace Novacoin
/// Stack reference
/// Depth
/// Byte sequence
- static IEnumerable stacktop(ref List> stack, int nDepth)
+ private static byte[] stacktop(ref List stack, int nDepth)
+ {
+ Contract.Requires(nDepth < 0, "Positive or zero stack depth makes no sense.");
+ Contract.Requires(stack.Count + nDepth >= 0, "Value exceeds real stack depth.");
+
+ return stack[stack.Count + nDepth];
+ }
+
+ ///
+ /// Cast argument to boolean value
+ ///
+ /// Some byte sequence
+ ///
+ private static bool CastToBool(byte[] arg)
+ {
+ for (var i = 0; i < arg.Length; i++)
+ {
+ if (arg[i] != 0)
+ {
+ // Can be negative zero
+ if (i == arg.Length - 1 && arg[i] == 0x80)
+ {
+ return false;
+ }
+
+ return true;
+ }
+ }
+
+ return false;
+ }
+
+ ///
+ /// Cast argument to integer value
+ ///
+ ///
+ ///
+ private static BigInteger CastToBigInteger(byte[] value)
+ {
+ Contract.Requires(value.Length <= 4, "Size limit failed.");
+
+ return new BigInteger(value);
+ }
+
+ ///
+ /// Execution of script
+ ///
+ ///
+ /// Script to execute
+ /// Transaction instance
+ /// Input number
+ /// Signature checking flags
+ /// Hash type flag
+ ///
+ public static bool EvalScript(ref List stack, CScript script, CTransaction txTo, int nIn, int flags, int nHashType)
+ {
+ var scriptBytes = ((byte[])script);
+
+ if (scriptBytes.Length > 10000)
+ {
+ return false; // Size limit failed
+ }
+
+ var vfExec = new List();
+
+ int nOpCount = 0;
+ int nCodeHashBegin = 0;
+
+ var falseBytes = new byte[0];
+ var trueBytes = new byte[] { 0x01 };
+
+ var CodeQueue = script.GetInstructionQueue();
+ var altStack = new List();
+
+#if !DEBUG
+ try
+ {
+#endif
+ instruction opcode;
+ byte[] pushArg;
+
+ while (GetOp(ref CodeQueue, out opcode, out pushArg)) // Read instructions
+ {
+ bool fExec = vfExec.IndexOf(false) == -1;
+
+ if (pushArg.Length > 520)
+ {
+ return false; // Script element size limit failed
+ }
+
+ if (opcode > instruction.OP_16 && ++nOpCount > 201)
+ {
+ return false;
+ }
+
+ if (fExec && 0 <= opcode && opcode <= instruction.OP_PUSHDATA4)
+ {
+ stack.Add(pushArg); // Push argument to stack
+ }
+ else if (fExec || (instruction.OP_IF <= opcode && opcode <= instruction.OP_ENDIF))
+ switch (opcode)
+ {
+ //
+ // Disabled instructions
+ //
+ case instruction.OP_CAT:
+ case instruction.OP_SUBSTR:
+ case instruction.OP_LEFT:
+ case instruction.OP_RIGHT:
+ case instruction.OP_INVERT:
+ case instruction.OP_AND:
+ case instruction.OP_OR:
+ case instruction.OP_XOR:
+ case instruction.OP_2MUL:
+ case instruction.OP_2DIV:
+ case instruction.OP_MUL:
+ case instruction.OP_DIV:
+ case instruction.OP_MOD:
+ case instruction.OP_LSHIFT:
+ case instruction.OP_RSHIFT:
+ return false;
+
+ //
+ // Push integer instructions
+ //
+ case instruction.OP_1NEGATE:
+ case instruction.OP_1:
+ case instruction.OP_2:
+ case instruction.OP_3:
+ case instruction.OP_4:
+ case instruction.OP_5:
+ case instruction.OP_6:
+ case instruction.OP_7:
+ case instruction.OP_8:
+ case instruction.OP_9:
+ case instruction.OP_10:
+ case instruction.OP_11:
+ case instruction.OP_12:
+ case instruction.OP_13:
+ case instruction.OP_14:
+ case instruction.OP_15:
+ case instruction.OP_16:
+ {
+ // ( -- value)
+ BigInteger bn = DecodeOP_N(opcode, true);
+ stack.Add(bn.ToByteArray());
+ }
+ break;
+
+ //
+ // Extension
+ //
+ case instruction.OP_NOP:
+ case instruction.OP_NOP1:
+ case instruction.OP_NOP2:
+ case instruction.OP_NOP3:
+ case instruction.OP_NOP4:
+ case instruction.OP_NOP5:
+ case instruction.OP_NOP6:
+ case instruction.OP_NOP7:
+ case instruction.OP_NOP8:
+ case instruction.OP_NOP9:
+ case instruction.OP_NOP10:
+ {
+ // Just do nothing
+ }
+ break;
+
+ //
+ // Control
+ //
+ case instruction.OP_IF:
+ case instruction.OP_NOTIF:
+ {
+ // if [statements] [else [statements]] endif
+ var fValue = false;
+ if (fExec)
+ {
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
+ var vch = stacktop(ref stack, -1);
+ fValue = CastToBool(vch);
+ if (opcode == instruction.OP_NOTIF)
+ {
+ fValue = !fValue;
+ }
+ popstack(ref stack);
+ }
+ vfExec.Add(fValue);
+ }
+ break;
+
+ case instruction.OP_ELSE:
+ {
+ int nExecCount = vfExec.Count();
+ if (nExecCount == 0)
+ {
+ return false;
+ }
+ vfExec[nExecCount - 1] = !vfExec[nExecCount - 1];
+ }
+ break;
+
+ case instruction.OP_ENDIF:
+ {
+ int nExecCount = vfExec.Count();
+ if (nExecCount == 0)
+ {
+ return false;
+ }
+ vfExec.RemoveAt(nExecCount - 1);
+ }
+ break;
+
+ case instruction.OP_VERIFY:
+ {
+ // (true -- ) or
+ // (false -- false) and return
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
+
+ bool fValue = CastToBool(stacktop(ref stack, -1));
+ if (fValue)
+ {
+ popstack(ref stack);
+ }
+ else
+ {
+ return false;
+ }
+ }
+ break;
+
+ case instruction.OP_RETURN:
+ {
+ return false;
+ }
+
+ //
+ // Stack ops
+ //
+ case instruction.OP_TOALTSTACK:
+ {
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
+ altStack.Add(stacktop(ref stack, -1));
+ popstack(ref stack);
+ }
+ break;
+
+ case instruction.OP_FROMALTSTACK:
+ {
+ if (altStack.Count() < 1)
+ {
+ return false;
+ }
+ stack.Add(stacktop(ref stack, -1));
+ popstack(ref altStack);
+ }
+ break;
+
+ case instruction.OP_2DROP:
+ {
+ // (x1 x2 -- )
+ if (stack.Count() < 2)
+ {
+ return false;
+ }
+ popstack(ref stack);
+ popstack(ref stack);
+ }
+ break;
+
+ case instruction.OP_2DUP:
+ {
+ // (x1 x2 -- x1 x2 x1 x2)
+ if (stack.Count() < 2)
+ {
+ return false;
+ }
+ var vch1 = stacktop(ref stack, -2);
+ var vch2 = stacktop(ref stack, -1);
+ stack.Add(vch1);
+ stack.Add(vch2);
+ }
+ break;
+
+ case instruction.OP_3DUP:
+ {
+ // (x1 x2 x3 -- x1 x2 x3 x1 x2 x3)
+ if (stack.Count() < 3)
+ {
+ return false;
+ }
+ var vch1 = stacktop(ref stack, -3);
+ var vch2 = stacktop(ref stack, -2);
+ var vch3 = stacktop(ref stack, -1);
+ stack.Add(vch1);
+ stack.Add(vch2);
+ stack.Add(vch3);
+ }
+ break;
+
+ case instruction.OP_2OVER:
+ {
+ // (x1 x2 x3 x4 -- x1 x2 x3 x4 x1 x2)
+ if (stack.Count() < 4)
+ {
+ return false;
+ }
+ var vch1 = stacktop(ref stack, -4);
+ var vch2 = stacktop(ref stack, -3);
+ stack.Add(vch1);
+ stack.Add(vch2);
+ }
+ break;
+
+ case instruction.OP_2ROT:
+ {
+ int nStackDepth = stack.Count();
+ // (x1 x2 x3 x4 x5 x6 -- x3 x4 x5 x6 x1 x2)
+ if (nStackDepth < 6)
+ {
+ return false;
+ }
+ var vch1 = stacktop(ref stack, -6);
+ var vch2 = stacktop(ref stack, -5);
+ stack.RemoveRange(nStackDepth - 6, 2);
+ stack.Add(vch1);
+ stack.Add(vch2);
+ }
+ break;
+
+ case instruction.OP_2SWAP:
+ {
+ // (x1 x2 x3 x4 -- x3 x4 x1 x2)
+ int nStackDepth = stack.Count;
+ if (nStackDepth < 4)
+ {
+ return false;
+ }
+ stack.Swap(nStackDepth - 4, nStackDepth - 2);
+ stack.Swap(nStackDepth - 3, nStackDepth - 1);
+ }
+ break;
+
+ case instruction.OP_IFDUP:
+ {
+ // (x - 0 | x x)
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
+
+ var vch = stacktop(ref stack, -1);
+
+ if (CastToBool(vch))
+ {
+ stack.Add(vch);
+ }
+ }
+ break;
+
+ case instruction.OP_DEPTH:
+ {
+ // -- stacksize
+ BigInteger bn = new BigInteger((ushort)stack.Count());
+ stack.Add(bn.ToByteArray());
+ }
+ break;
+
+ case instruction.OP_DROP:
+ {
+ // (x -- )
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
+
+ popstack(ref stack);
+ }
+ break;
+
+ case instruction.OP_DUP:
+ {
+ // (x -- x x)
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
+
+ var vch = stacktop(ref stack, -1);
+ stack.Add(vch);
+ }
+ break;
+
+ case instruction.OP_NIP:
+ {
+ // (x1 x2 -- x2)
+ int nStackDepth = stack.Count();
+ if (nStackDepth < 2)
+ {
+ return false;
+ }
+
+ stack.RemoveAt(nStackDepth - 2);
+ }
+ break;
+
+ case instruction.OP_OVER:
+ {
+ // (x1 x2 -- x1 x2 x1)
+ if (stack.Count() < 2)
+ {
+ return false;
+ }
+
+ var vch = stacktop(ref stack, -2);
+ stack.Add(vch);
+ }
+ break;
+
+ case instruction.OP_PICK:
+ case instruction.OP_ROLL:
+ {
+ // (xn ... x2 x1 x0 n - xn ... x2 x1 x0 xn)
+ // (xn ... x2 x1 x0 n - ... x2 x1 x0 xn)
+
+ int nStackDepth = stack.Count();
+ if (nStackDepth < 2)
+ {
+ return false;
+ }
+
+ int n = (int)CastToBigInteger(stacktop(ref stack, -1));
+ popstack(ref stack);
+
+ if (n < 0 || n >= stack.Count())
+ {
+ return false;
+ }
+
+ var vch = stacktop(ref stack, -n - 1);
+ if (opcode == instruction.OP_ROLL)
+ {
+ stack.RemoveAt(nStackDepth - n - 1);
+ }
+
+ stack.Add(vch);
+ }
+ break;
+
+ case instruction.OP_ROT:
+ {
+ // (x1 x2 x3 -- x2 x3 x1)
+ // x2 x1 x3 after first swap
+ // x2 x3 x1 after second swap
+ int nStackDepth = stack.Count();
+ if (nStackDepth < 3)
+ {
+ return false;
+ }
+ stack.Swap(nStackDepth - 3, nStackDepth - 2);
+ stack.Swap(nStackDepth - 2, nStackDepth - 1);
+
+ }
+ break;
+
+ case instruction.OP_SWAP:
+ {
+ // (x1 x2 -- x2 x1)
+ int nStackDepth = stack.Count();
+ if (nStackDepth < 2)
+ {
+ return false;
+ }
+ stack.Swap(nStackDepth - 2, nStackDepth - 1);
+ }
+ break;
+
+ case instruction.OP_TUCK:
+ {
+ // (x1 x2 -- x2 x1 x2)
+ int nStackDepth = stack.Count();
+ if (nStackDepth < 2)
+ {
+ return false;
+ }
+ var vch = stacktop(ref stack, -1);
+ stack.Insert(nStackDepth - 2, vch);
+ }
+ break;
+
+
+ case instruction.OP_SIZE:
+ {
+ // (in -- in size)
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
+
+ var bnSize = new BigInteger((ushort)stacktop(ref stack, -1).Count());
+ stack.Add(bnSize.ToByteArray());
+ }
+ break;
+
+
+ //
+ // Bitwise logic
+ //
+ case instruction.OP_EQUAL:
+ case instruction.OP_EQUALVERIFY:
+ //case instruction.OP_NOTEQUAL: // use OP_NUMNOTEQUAL
+ {
+ // (x1 x2 - bool)
+ if (stack.Count() < 2)
+ {
+ return false;
+ }
+
+ var vch1 = stacktop(ref stack, -2);
+ var vch2 = stacktop(ref stack, -1);
+ bool fEqual = (vch1.SequenceEqual(vch2));
+ // OP_NOTEQUAL is disabled because it would be too easy to say
+ // something like n != 1 and have some wiseguy pass in 1 with extra
+ // zero bytes after it (numerically, 0x01 == 0x0001 == 0x000001)
+ //if (opcode == instruction.OP_NOTEQUAL)
+ // fEqual = !fEqual;
+ popstack(ref stack);
+ popstack(ref stack);
+ stack.Add(fEqual ? trueBytes : falseBytes);
+
+ if (opcode == instruction.OP_EQUALVERIFY)
+ {
+ if (fEqual)
+ {
+ popstack(ref stack);
+ }
+ else
+ {
+ return false;
+ }
+ }
+ }
+ break;
+
+
+ //
+ // Numeric
+ //
+ case instruction.OP_1ADD:
+ case instruction.OP_1SUB:
+ case instruction.OP_NEGATE:
+ case instruction.OP_ABS:
+ case instruction.OP_NOT:
+ case instruction.OP_0NOTEQUAL:
+ {
+ // (in -- out)
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
+
+ var bn = CastToBigInteger(stacktop(ref stack, -1));
+ switch (opcode)
+ {
+ case instruction.OP_1ADD:
+ bn = bn + 1;
+ break;
+ case instruction.OP_1SUB:
+ bn = bn - 1;
+ break;
+ case instruction.OP_NEGATE:
+ bn = -bn;
+ break;
+ case instruction.OP_ABS:
+ bn = BigInteger.Abs(bn);
+ break;
+ case instruction.OP_NOT:
+ bn = bn == 0 ? 1 : 0;
+ break;
+ case instruction.OP_0NOTEQUAL:
+ bn = bn != 0 ? 1 : 0;
+ break;
+ }
+
+ popstack(ref stack);
+ stack.Add(bn.ToByteArray());
+ }
+ break;
+
+ case instruction.OP_ADD:
+ case instruction.OP_SUB:
+ case instruction.OP_BOOLAND:
+ case instruction.OP_BOOLOR:
+ case instruction.OP_NUMEQUAL:
+ case instruction.OP_NUMEQUALVERIFY:
+ case instruction.OP_NUMNOTEQUAL:
+ case instruction.OP_LESSTHAN:
+ case instruction.OP_GREATERTHAN:
+ case instruction.OP_LESSTHANOREQUAL:
+ case instruction.OP_GREATERTHANOREQUAL:
+ case instruction.OP_MIN:
+ case instruction.OP_MAX:
+ {
+ // (x1 x2 -- out)
+ if (stack.Count() < 2)
+ {
+ return false;
+ }
+
+ var bn1 = CastToBigInteger(stacktop(ref stack, -2));
+ var bn2 = CastToBigInteger(stacktop(ref stack, -1));
+ BigInteger bn = 0;
+
+ switch (opcode)
+ {
+ case instruction.OP_ADD:
+ bn = bn1 + bn2;
+ break;
+ case instruction.OP_SUB:
+ bn = bn1 - bn2;
+ break;
+ case instruction.OP_BOOLAND:
+ bn = (bn1 != 0 && bn2 != 0) ? 1 : 0;
+ break;
+ case instruction.OP_BOOLOR:
+ bn = (bn1 != 0 || bn2 != 0) ? 1 : 0;
+ break;
+ case instruction.OP_NUMEQUAL:
+ bn = (bn1 == bn2) ? 1 : 0;
+ break;
+ case instruction.OP_NUMEQUALVERIFY:
+ bn = (bn1 == bn2) ? 1 : 0;
+ break;
+ case instruction.OP_NUMNOTEQUAL:
+ bn = (bn1 != bn2) ? 1 : 0;
+ break;
+ case instruction.OP_LESSTHAN:
+ bn = (bn1 < bn2) ? 1 : 0;
+ break;
+ case instruction.OP_GREATERTHAN:
+ bn = (bn1 > bn2) ? 1 : 0;
+ break;
+ case instruction.OP_LESSTHANOREQUAL:
+ bn = (bn1 <= bn2) ? 1 : 0;
+ break;
+ case instruction.OP_GREATERTHANOREQUAL:
+ bn = (bn1 >= bn2) ? 1 : 0;
+ break;
+ case instruction.OP_MIN:
+ bn = (bn1 < bn2 ? bn1 : bn2);
+ break;
+ case instruction.OP_MAX:
+ bn = (bn1 > bn2 ? bn1 : bn2);
+ break;
+ }
+
+ popstack(ref stack);
+ popstack(ref stack);
+ stack.Add(bn.ToByteArray());
+
+ if (opcode == instruction.OP_NUMEQUALVERIFY)
+ {
+ if (CastToBool(stacktop(ref stack, -1)))
+ {
+ popstack(ref stack);
+ }
+ else
+ {
+ return false;
+ }
+ }
+ }
+ break;
+
+ case instruction.OP_WITHIN:
+ {
+ // (x min max -- out)
+ if (stack.Count() < 3)
+ {
+ return false;
+ }
+
+ var bn1 = CastToBigInteger(stacktop(ref stack, -3));
+ var bn2 = CastToBigInteger(stacktop(ref stack, -2));
+ var bn3 = CastToBigInteger(stacktop(ref stack, -1));
+
+ bool fValue = (bn2 <= bn1 && bn1 < bn3);
+
+ popstack(ref stack);
+ popstack(ref stack);
+ popstack(ref stack);
+
+ stack.Add(fValue ? trueBytes : falseBytes);
+ }
+ break;
+
+ //
+ // Crypto
+ //
+ case instruction.OP_RIPEMD160:
+ case instruction.OP_SHA1:
+ case instruction.OP_SHA256:
+ case instruction.OP_HASH160:
+ case instruction.OP_HASH256:
+ {
+ // (in -- hash)
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
+ Hash hash = null;
+ var data = stacktop(ref stack, -1);
+
+ switch (opcode)
+ {
+ 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(hash);
+ }
+ break;
+
+ case instruction.OP_CODESEPARATOR:
+ {
+ // Hash starts after the code separator
+ nCodeHashBegin = CodeQueue.Index;
+ }
+ break;
+
+ case instruction.OP_CHECKSIG:
+ case instruction.OP_CHECKSIGVERIFY:
+ {
+ // (sig pubkey -- bool)
+ if (stack.Count() < 2)
+ {
+ return false;
+ }
+
+ var sigBytes = stacktop(ref stack, -2);
+ var pubkeyBytes = stacktop(ref stack, -1);
+
+ // Subset of script starting at the most recent codeseparator
+ var scriptCode = new CScript(scriptBytes.Skip(nCodeHashBegin).ToArray());
+
+ // There's no way for a signature to sign itself
+ scriptCode.RemovePattern(sigBytes);
+
+ bool fSuccess = IsCanonicalSignature(sigBytes, flags) && IsCanonicalPubKey(pubkeyBytes, flags) && CheckSig(sigBytes, pubkeyBytes, scriptCode, txTo, nIn, nHashType, flags);
+
+ popstack(ref stack);
+ popstack(ref stack);
+
+ stack.Add(fSuccess ? trueBytes : falseBytes);
+
+ if (opcode == instruction.OP_CHECKSIGVERIFY)
+ {
+ if (fSuccess)
+ {
+ popstack(ref stack);
+ }
+ else
+ {
+ return false;
+ }
+ }
+ }
+ break;
+
+ case instruction.OP_CHECKMULTISIG:
+ case instruction.OP_CHECKMULTISIGVERIFY:
+ {
+ // ([sig ...] num_of_signatures [pubkey ...] num_of_pubkeys -- bool)
+
+ int i = 1;
+ if (stack.Count() < i)
+ {
+ return false;
+ }
+
+ int nKeysCount = (int)CastToBigInteger(stacktop(ref stack, -i));
+ if (nKeysCount < 0 || nKeysCount > 20)
+ {
+ return false;
+ }
+ nOpCount += nKeysCount;
+ if (nOpCount > 201)
+ {
+ return false;
+ }
+ int ikey = ++i;
+ i += nKeysCount;
+ if (stack.Count() < i)
+ {
+ return false;
+ }
+
+ int nSigsCount = (int)CastToBigInteger(stacktop(ref stack, -i));
+ if (nSigsCount < 0 || nSigsCount > nKeysCount)
+ {
+ return false;
+ }
+ int isig = ++i;
+ i += nSigsCount;
+ if (stack.Count() < i)
+ {
+ return false;
+ }
+
+ // Subset of script starting at the most recent codeseparator
+ 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++)
+ {
+ var vchSig = stacktop(ref stack, -isig - k);
+ scriptCode.RemovePattern(vchSig);
+ }
+
+ bool fSuccess = true;
+ while (fSuccess && nSigsCount > 0)
+ {
+ var sigBytes = stacktop(ref stack, -isig);
+ var pubKeyBytes = stacktop(ref stack, -ikey);
+
+ // Check signature
+ bool fOk = IsCanonicalSignature(sigBytes, flags) && IsCanonicalPubKey(pubKeyBytes, flags) && CheckSig(sigBytes, pubKeyBytes, scriptCode, txTo, nIn, nHashType, flags);
+
+ if (fOk)
+ {
+ isig++;
+ nSigsCount--;
+ }
+ ikey++;
+ nKeysCount--;
+
+ // If there are more signatures left than keys left,
+ // then too many signatures have failed
+ if (nSigsCount > nKeysCount)
+ {
+ fSuccess = false;
+ }
+ }
+
+ while (i-- > 1)
+ {
+ popstack(ref stack);
+ }
+
+ // A bug causes CHECKMULTISIG to consume one extra argument
+ // whose contents were not checked in any way.
+ //
+ // Unfortunately this is a potential source of mutability,
+ // so optionally verify it is exactly equal to zero prior
+ // to removing it from the stack.
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
+ if ((flags & (int)scriptflag.SCRIPT_VERIFY_NULLDUMMY) != 0 && stacktop(ref stack, -1).Count() != 0)
+ {
+ return false; // CHECKMULTISIG dummy argument not null
+ }
+ popstack(ref stack);
+
+ stack.Add(fSuccess ? trueBytes : falseBytes);
+
+ if (opcode == instruction.OP_CHECKMULTISIGVERIFY)
+ {
+ if (fSuccess)
+ {
+ popstack(ref stack);
+ }
+ else
+ {
+ return false;
+ }
+ }
+ }
+ break;
+
+ default:
+ return false;
+ }
+
+ // Size limits
+ if (stack.Count() + altStack.Count() > 1000)
+ {
+ return false;
+ }
+ }
+#if !DEBUG
+ }
+ catch (Exception)
+ {
+ // If there are any exceptions then just return false.
+ return false;
+ }
+#endif
+
+ if (vfExec.Count() != 0)
+ {
+ // Something went wrong with conditional instructions.
+ return false;
+ }
+
+ return true;
+ }
+
+
+ public static bool IsCanonicalPubKey(byte[] pubKeyBytes, int flags)
{
- int nStackElement = stack.Count + nDepth;
+ if ((flags & (int)scriptflag.SCRIPT_VERIFY_STRICTENC) == 0)
+ return true;
- if (nDepth >= 0)
+ if (pubKeyBytes.Length < 33)
+ return false; // Non-canonical public key: too short
+ if (pubKeyBytes[0] == 0x04)
+ {
+ if (pubKeyBytes.Length != 65)
+ return false; // Non-canonical public key: invalid length for uncompressed key
+ }
+ else if (pubKeyBytes[0] == 0x02 || pubKeyBytes[0] == 0x03)
+ {
+ if (pubKeyBytes.Length != 33)
+ return false; // Non-canonical public key: invalid length for compressed key
+ }
+ else
{
- StringBuilder sb = new StringBuilder();
- sb.AppendFormat("stacktop() : positive depth ({0})", nDepth);
+ return false; // Non-canonical public key: compressed nor uncompressed
+ }
+ return true;
+ }
+
+ public static bool IsCanonicalSignature(byte[] sigBytes, int flags)
+ {
+ // STUB
+
+ return true;
+ }
+
+ ///
+ /// Check signature.
+ ///
+ /// Signature
+ /// Public key
+ /// Spending script
+ /// CTransaction instance
+ /// Input number
+ /// Hashing type flag
+ /// Signature checking flags
+ /// Checking result
+ public static bool CheckSig(byte[] sigBytes, byte[] pubkeyBytes, CScript script, CTransaction txTo, int nIn, int nHashType, int flags)
+ {
+ CPubKey pubkey;
+
+ try
+ {
+ // Trying to initialize the public key instance
+
+ pubkey = new CPubKey(pubkeyBytes);
+ }
+ catch (Exception)
+ {
+ // Exception occurred while initializing the public key
- throw new StackMachineException(sb.ToString());
+ return false;
}
- if (nStackElement < 0)
+ if (!pubkey.IsValid)
{
- StringBuilder sb = new StringBuilder();
- sb.AppendFormat("stacktop() : nDepth={0} exceeds real stack depth", nDepth);
+ return false;
+ }
- throw new StackMachineException(sb.ToString());
+ if (sigBytes.Length == 0)
+ {
+ return false;
}
- return stack[nStackElement];
+ // Hash type is one byte tacked on to the end of the signature
+ if (nHashType == 0)
+ {
+ nHashType = sigBytes.Last();
+ }
+ else if (nHashType != sigBytes.Last())
+ {
+ return false;
+ }
+
+ // Remove hash type
+ Array.Resize(ref sigBytes, sigBytes.Length - 1);
+
+ var sighash = SignatureHash(script, txTo, nIn, nHashType);
+
+ if (!pubkey.VerifySignature(sighash, sigBytes))
+ {
+ return false;
+ }
+
+ return true;
}
+ ///
+ /// Evaluates the both scriptSig and scriptPubKey.
+ ///
+ ///
+ ///
+ /// Transaction
+ /// Input number
+ /// Script validation flags
+ /// Hash type flag
+ ///
+ public static bool VerifyScript(CScript scriptSig, CScript scriptPubKey, CTransaction txTo, int nIn, int flags, int nHashType)
+ {
+ var stack = new List();
+ List stackCopy = null;
+
+ if (!EvalScript(ref stack, scriptSig, txTo, nIn, flags, nHashType))
+ {
+ return false;
+ }
+
+ if ((flags & (int)scriptflag.SCRIPT_VERIFY_P2SH) != 0)
+ {
+ stackCopy = new List(stack);
+ }
+
+ if (!EvalScript(ref stack, scriptPubKey, txTo, nIn, flags, nHashType))
+ {
+ return false;
+ }
+
+ if (stack.Count == 0 || CastToBool(stack.Last()) == false)
+ {
+ return false;
+ }
+ // Additional validation for spend-to-script-hash transactions:
+ if ((flags & (int)scriptflag.SCRIPT_VERIFY_P2SH) != 0 && scriptPubKey.IsPayToScriptHash)
+ {
+ if (!scriptSig.IsPushOnly) // scriptSig must be literals-only
+ {
+ return false;
+ }
+
+ // stackCopy cannot be empty here, because if it was the
+ // P2SH HASH <> EQUAL scriptPubKey would be evaluated with
+ // an empty stack and the EvalScript above would return false.
+
+ if (stackCopy.Count == 0)
+ {
+ throw new StackMachineException("Fatal script validation error.");
+ }
+ var pubKey2 = new CScript(stackCopy.Last());
+ popstack(ref stackCopy);
+
+ if (!EvalScript(ref stackCopy, pubKey2, txTo, nIn, flags, nHashType))
+ return false;
+ if (stackCopy.Count == 0)
+ return false;
+
+ return CastToBool(stackCopy.Last());
+ }
+
+ return true;
+ }
};
}