using System.Linq;
using System.Text;
+using System.Numerics;
+
+// using Org.BouncyCastle.Math;
+
namespace Novacoin
{
/// <summary>
/// Script opcodes
/// </summary>
- public enum opcodetype
+ public enum instruction
{
// push value
OP_0 = 0x00,
TX_NULL_DATA,
};
+ /// <summary>
+ /// Signature hash types/flags
+ /// </summary>
+ public enum sigflag
+ {
+ SIGHASH_ALL = 1,
+ SIGHASH_NONE = 2,
+ SIGHASH_SINGLE = 3,
+ 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)
+ {
+ switch (t)
+ {
+ case txnouttype.TX_NONSTANDARD: return "nonstandard";
+ case txnouttype.TX_PUBKEY: return "pubkey";
+ case txnouttype.TX_PUBKEYHASH: return "pubkeyhash";
+ case txnouttype.TX_SCRIPTHASH: return "scripthash";
+ case txnouttype.TX_MULTISIG: return "multisig";
+ case txnouttype.TX_NULL_DATA: return "nulldata";
+ }
+ return string.Empty;
+ }
/// <summary>
/// Get the name of supplied opcode
/// </summary>
/// <param name="opcode">Opcode</param>
/// <returns>Opcode name</returns>
- public static string GetOpName(opcodetype opcode)
+ public static string GetOpName(instruction opcode)
{
switch (opcode)
{
// push value
- case opcodetype.OP_0:
- return "0";
- case opcodetype.OP_PUSHDATA1:
+ case instruction.OP_0:
+ return "OP_0";
+ case instruction.OP_PUSHDATA1:
return "OP_PUSHDATA1";
- case opcodetype.OP_PUSHDATA2:
+ case instruction.OP_PUSHDATA2:
return "OP_PUSHDATA2";
- case opcodetype.OP_PUSHDATA4:
+ case instruction.OP_PUSHDATA4:
return "OP_PUSHDATA4";
- case opcodetype.OP_1NEGATE:
- return "-1";
- case opcodetype.OP_RESERVED:
+ case instruction.OP_1NEGATE:
+ return "OP_1NEGATE";
+ case instruction.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";
+ case instruction.OP_1:
+ return "OP_1";
+ case instruction.OP_2:
+ return "OP_2";
+ case instruction.OP_3:
+ return "OP_3";
+ case instruction.OP_4:
+ return "OP_4";
+ case instruction.OP_5:
+ return "OP_5";
+ case instruction.OP_6:
+ return "OP_6";
+ case instruction.OP_7:
+ return "OP_7";
+ case instruction.OP_8:
+ return "OP_8";
+ case instruction.OP_9:
+ return "OP_9";
+ case instruction.OP_10:
+ return "OP_10";
+ case instruction.OP_11:
+ return "OP_11";
+ case instruction.OP_12:
+ return "OP_12";
+ case instruction.OP_13:
+ return "OP_13";
+ case instruction.OP_14:
+ return "OP_14";
+ case instruction.OP_15:
+ return "OP_15";
+ case instruction.OP_16:
+ return "OP_16";
// control
- case opcodetype.OP_NOP:
+ case instruction.OP_NOP:
return "OP_NOP";
- case opcodetype.OP_VER:
+ case instruction.OP_VER:
return "OP_VER";
- case opcodetype.OP_IF:
+ case instruction.OP_IF:
return "OP_IF";
- case opcodetype.OP_NOTIF:
+ case instruction.OP_NOTIF:
return "OP_NOTIF";
- case opcodetype.OP_VERIF:
+ case instruction.OP_VERIF:
return "OP_VERIF";
- case opcodetype.OP_VERNOTIF:
+ case instruction.OP_VERNOTIF:
return "OP_VERNOTIF";
- case opcodetype.OP_ELSE:
+ case instruction.OP_ELSE:
return "OP_ELSE";
- case opcodetype.OP_ENDIF:
+ case instruction.OP_ENDIF:
return "OP_ENDIF";
- case opcodetype.OP_VERIFY:
+ case instruction.OP_VERIFY:
return "OP_VERIFY";
- case opcodetype.OP_RETURN:
+ case instruction.OP_RETURN:
return "OP_RETURN";
// stack ops
- case opcodetype.OP_TOALTSTACK:
+ case instruction.OP_TOALTSTACK:
return "OP_TOALTSTACK";
- case opcodetype.OP_FROMALTSTACK:
+ case instruction.OP_FROMALTSTACK:
return "OP_FROMALTSTACK";
- case opcodetype.OP_2DROP:
+ case instruction.OP_2DROP:
return "OP_2DROP";
- case opcodetype.OP_2DUP:
+ case instruction.OP_2DUP:
return "OP_2DUP";
- case opcodetype.OP_3DUP:
+ case instruction.OP_3DUP:
return "OP_3DUP";
- case opcodetype.OP_2OVER:
+ case instruction.OP_2OVER:
return "OP_2OVER";
- case opcodetype.OP_2ROT:
+ case instruction.OP_2ROT:
return "OP_2ROT";
- case opcodetype.OP_2SWAP:
+ case instruction.OP_2SWAP:
return "OP_2SWAP";
- case opcodetype.OP_IFDUP:
+ case instruction.OP_IFDUP:
return "OP_IFDUP";
- case opcodetype.OP_DEPTH:
+ case instruction.OP_DEPTH:
return "OP_DEPTH";
- case opcodetype.OP_DROP:
+ case instruction.OP_DROP:
return "OP_DROP";
- case opcodetype.OP_DUP:
+ case instruction.OP_DUP:
return "OP_DUP";
- case opcodetype.OP_NIP:
+ case instruction.OP_NIP:
return "OP_NIP";
- case opcodetype.OP_OVER:
+ case instruction.OP_OVER:
return "OP_OVER";
- case opcodetype.OP_PICK:
+ case instruction.OP_PICK:
return "OP_PICK";
- case opcodetype.OP_ROLL:
+ case instruction.OP_ROLL:
return "OP_ROLL";
- case opcodetype.OP_ROT:
+ case instruction.OP_ROT:
return "OP_ROT";
- case opcodetype.OP_SWAP:
+ case instruction.OP_SWAP:
return "OP_SWAP";
- case opcodetype.OP_TUCK:
+ case instruction.OP_TUCK:
return "OP_TUCK";
// splice ops
- case opcodetype.OP_CAT:
+ case instruction.OP_CAT:
return "OP_CAT";
- case opcodetype.OP_SUBSTR:
+ case instruction.OP_SUBSTR:
return "OP_SUBSTR";
- case opcodetype.OP_LEFT:
+ case instruction.OP_LEFT:
return "OP_LEFT";
- case opcodetype.OP_RIGHT:
+ case instruction.OP_RIGHT:
return "OP_RIGHT";
- case opcodetype.OP_SIZE:
+ case instruction.OP_SIZE:
return "OP_SIZE";
// bit logic
- case opcodetype.OP_INVERT:
+ case instruction.OP_INVERT:
return "OP_INVERT";
- case opcodetype.OP_AND:
+ case instruction.OP_AND:
return "OP_AND";
- case opcodetype.OP_OR:
+ case instruction.OP_OR:
return "OP_OR";
- case opcodetype.OP_XOR:
+ case instruction.OP_XOR:
return "OP_XOR";
- case opcodetype.OP_EQUAL:
+ case instruction.OP_EQUAL:
return "OP_EQUAL";
- case opcodetype.OP_EQUALVERIFY:
+ case instruction.OP_EQUALVERIFY:
return "OP_EQUALVERIFY";
- case opcodetype.OP_RESERVED1:
+ case instruction.OP_RESERVED1:
return "OP_RESERVED1";
- case opcodetype.OP_RESERVED2:
+ case instruction.OP_RESERVED2:
return "OP_RESERVED2";
// numeric
- case opcodetype.OP_1ADD:
+ case instruction.OP_1ADD:
return "OP_1ADD";
- case opcodetype.OP_1SUB:
+ case instruction.OP_1SUB:
return "OP_1SUB";
- case opcodetype.OP_2MUL:
+ case instruction.OP_2MUL:
return "OP_2MUL";
- case opcodetype.OP_2DIV:
+ case instruction.OP_2DIV:
return "OP_2DIV";
- case opcodetype.OP_NEGATE:
+ case instruction.OP_NEGATE:
return "OP_NEGATE";
- case opcodetype.OP_ABS:
+ case instruction.OP_ABS:
return "OP_ABS";
- case opcodetype.OP_NOT:
+ case instruction.OP_NOT:
return "OP_NOT";
- case opcodetype.OP_0NOTEQUAL:
+ case instruction.OP_0NOTEQUAL:
return "OP_0NOTEQUAL";
- case opcodetype.OP_ADD:
+ case instruction.OP_ADD:
return "OP_ADD";
- case opcodetype.OP_SUB:
+ case instruction.OP_SUB:
return "OP_SUB";
- case opcodetype.OP_MUL:
+ case instruction.OP_MUL:
return "OP_MUL";
- case opcodetype.OP_DIV:
+ case instruction.OP_DIV:
return "OP_DIV";
- case opcodetype.OP_MOD:
+ case instruction.OP_MOD:
return "OP_MOD";
- case opcodetype.OP_LSHIFT:
+ case instruction.OP_LSHIFT:
return "OP_LSHIFT";
- case opcodetype.OP_RSHIFT:
+ case instruction.OP_RSHIFT:
return "OP_RSHIFT";
- case opcodetype.OP_BOOLAND:
+ case instruction.OP_BOOLAND:
return "OP_BOOLAND";
- case opcodetype.OP_BOOLOR:
+ case instruction.OP_BOOLOR:
return "OP_BOOLOR";
- case opcodetype.OP_NUMEQUAL:
+ case instruction.OP_NUMEQUAL:
return "OP_NUMEQUAL";
- case opcodetype.OP_NUMEQUALVERIFY:
+ case instruction.OP_NUMEQUALVERIFY:
return "OP_NUMEQUALVERIFY";
- case opcodetype.OP_NUMNOTEQUAL:
+ case instruction.OP_NUMNOTEQUAL:
return "OP_NUMNOTEQUAL";
- case opcodetype.OP_LESSTHAN:
+ case instruction.OP_LESSTHAN:
return "OP_LESSTHAN";
- case opcodetype.OP_GREATERTHAN:
+ case instruction.OP_GREATERTHAN:
return "OP_GREATERTHAN";
- case opcodetype.OP_LESSTHANOREQUAL:
+ case instruction.OP_LESSTHANOREQUAL:
return "OP_LESSTHANOREQUAL";
- case opcodetype.OP_GREATERTHANOREQUAL:
+ case instruction.OP_GREATERTHANOREQUAL:
return "OP_GREATERTHANOREQUAL";
- case opcodetype.OP_MIN:
+ case instruction.OP_MIN:
return "OP_MIN";
- case opcodetype.OP_MAX:
+ case instruction.OP_MAX:
return "OP_MAX";
- case opcodetype.OP_WITHIN:
+ case instruction.OP_WITHIN:
return "OP_WITHIN";
// crypto
- case opcodetype.OP_RIPEMD160:
+ case instruction.OP_RIPEMD160:
return "OP_RIPEMD160";
- case opcodetype.OP_SHA1:
+ case instruction.OP_SHA1:
return "OP_SHA1";
- case opcodetype.OP_SHA256:
+ case instruction.OP_SHA256:
return "OP_SHA256";
- case opcodetype.OP_HASH160:
+ case instruction.OP_HASH160:
return "OP_HASH160";
- case opcodetype.OP_HASH256:
+ case instruction.OP_HASH256:
return "OP_HASH256";
- case opcodetype.OP_CODESEPARATOR:
+ case instruction.OP_CODESEPARATOR:
return "OP_CODESEPARATOR";
- case opcodetype.OP_CHECKSIG:
+ case instruction.OP_CHECKSIG:
return "OP_CHECKSIG";
- case opcodetype.OP_CHECKSIGVERIFY:
+ case instruction.OP_CHECKSIGVERIFY:
return "OP_CHECKSIGVERIFY";
- case opcodetype.OP_CHECKMULTISIG:
+ case instruction.OP_CHECKMULTISIG:
return "OP_CHECKMULTISIG";
- case opcodetype.OP_CHECKMULTISIGVERIFY:
+ case instruction.OP_CHECKMULTISIGVERIFY:
return "OP_CHECKMULTISIGVERIFY";
// expansion
- case opcodetype.OP_NOP1:
+ case instruction.OP_NOP1:
return "OP_NOP1";
- case opcodetype.OP_NOP2:
+ case instruction.OP_NOP2:
return "OP_NOP2";
- case opcodetype.OP_NOP3:
+ case instruction.OP_NOP3:
return "OP_NOP3";
- case opcodetype.OP_NOP4:
+ case instruction.OP_NOP4:
return "OP_NOP4";
- case opcodetype.OP_NOP5:
+ case instruction.OP_NOP5:
return "OP_NOP5";
- case opcodetype.OP_NOP6:
+ case instruction.OP_NOP6:
return "OP_NOP6";
- case opcodetype.OP_NOP7:
+ case instruction.OP_NOP7:
return "OP_NOP7";
- case opcodetype.OP_NOP8:
+ case instruction.OP_NOP8:
return "OP_NOP8";
- case opcodetype.OP_NOP9:
+ case instruction.OP_NOP9:
return "OP_NOP9";
- case opcodetype.OP_NOP10:
+ case instruction.OP_NOP10:
return "OP_NOP10";
// template matching params
- case opcodetype.OP_PUBKEYHASH:
+ case instruction.OP_SMALLINTEGER:
+ return "OP_SMALLINTEGER";
+ case instruction.OP_PUBKEYHASH:
return "OP_PUBKEYHASH";
- case opcodetype.OP_PUBKEY:
+ case instruction.OP_PUBKEY:
return "OP_PUBKEY";
- case opcodetype.OP_SMALLDATA:
+ case instruction.OP_PUBKEYS:
+ return "OP_PUBKEYS";
+ case instruction.OP_SMALLDATA:
return "OP_SMALLDATA";
- case opcodetype.OP_INVALIDOPCODE:
+ case instruction.OP_INVALIDOPCODE:
return "OP_INVALIDOPCODE";
default:
return "OP_UNKNOWN";
/// <summary>
/// Get next opcode from passed list of bytes and extract push arguments if there are some.
/// </summary>
- /// <param name="codeBytes">WrappedList reference.</param>
+ /// <param name="codeBytes">ByteQueue reference.</param>
/// <param name="opcodeRet">Found opcode.</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 WrappedList<byte> codeBytes, out opcodetype opcodeRet, out IEnumerable<byte> bytesRet)
+ public static bool GetOp(ref ByteQueue codeBytes, out instruction opcodeRet, out IEnumerable<byte> bytesRet)
{
bytesRet = new List<byte>();
- opcodeRet = opcodetype.OP_INVALIDOPCODE;
+ opcodeRet = instruction.OP_INVALIDOPCODE;
- opcodetype opcode;
+ instruction opcode;
try
{
// Read instruction
- opcode = (opcodetype)codeBytes.GetItem();
+ opcode = (instruction)codeBytes.Get();
}
- catch (WrappedListException)
+ catch (ByteQueueException)
{
// No instruction found there
return false;
}
// Immediate operand
- if (opcode <= opcodetype.OP_PUSHDATA4)
+ if (opcode <= instruction.OP_PUSHDATA4)
{
byte[] szBytes = new byte[4] { 0, 0, 0, 0 }; // Zero length
try
{
- if (opcode < opcodetype.OP_PUSHDATA1)
+ if (opcode < instruction.OP_PUSHDATA1)
{
// Zero value opcodes (OP_0, OP_FALSE)
szBytes[3] = (byte)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.GetItem();
+ szBytes[3] = (byte)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.GetItems(2).CopyTo(szBytes, 2);
+ codeBytes.Get(2).CopyTo(szBytes, 2);
}
- 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.GetItems(4);
+ szBytes = codeBytes.Get(4);
}
}
- catch (WrappedListException)
+ catch (ByteQueueException)
{
// Unable to read operand length
return false;
try
{
// Read found number of bytes into list of OP_PUSHDATAn arguments.
- bytesRet = codeBytes.GetEnumerableItems(nSize);
+ bytesRet = codeBytes.GetEnumerable(nSize);
}
- catch (WrappedListException)
+ catch (ByteQueueException)
{
// Unable to read data
return false;
}
/// <summary>
- /// Decode small integer
+ /// Decode instruction to integer value
/// </summary>
- /// <param name="opcode">Small integer opcode (OP_0 - OP_16)</param>
+ /// <param name="opcode">Small integer opcode (OP_1_NEGATE and OP_0 - OP_16)</param>
/// <returns>Small integer</returns>
- public static int DecodeOP_N(opcodetype opcode)
+ public static int DecodeOP_N(instruction opcode, bool AllowNegate = false)
{
- if (opcode == opcodetype.OP_0)
+ if (AllowNegate && opcode == instruction.OP_1NEGATE)
+ {
+ return -1;
+ }
+
+ if (opcode == instruction.OP_0)
+ {
return 0;
+ }
// 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);
+ if (opcode < instruction.OP_1 || opcode > instruction.OP_16)
+ {
+ throw new ArgumentException("Invalid integer instruction.");
+ }
+
+ return (int)opcode - (int)(instruction.OP_1 - 1);
}
/// <summary>
- /// Converts small integer into opcode
+ /// Converts integer into instruction
/// </summary>
- /// <param name="n">Small integer from the range of 0 up to 16.</param>
+ /// <param name="n">Small integer from the range of -1 up to 16.</param>
/// <returns>Corresponding opcode.</returns>
- public static opcodetype EncodeOP_N(int n)
+ public static instruction EncodeOP_N(int n, bool allowNegate = false)
{
+ if (allowNegate && n == -1)
+ {
+ return instruction.OP_1NEGATE;
+ }
+
+ if (n == 0)
+ {
+ return instruction.OP_0;
+ }
+
// 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);
+ throw new ArgumentException("Invalid integer value.");
+ return (instruction.OP_1 + n - 1);
}
public static int ScriptSigArgsExpected(txnouttype t, IList<IEnumerable<byte>> solutions)
return -1;
}
-
+ /// <summary>
+ /// Is it a standart type of scriptPubKey?
+ /// </summary>
+ /// <param name="scriptPubKey">CScript instance</param>
+ /// <param name="whichType">utut type</param>
+ /// <returns>Checking result</returns>
public static bool IsStandard(CScript scriptPubKey, out txnouttype whichType)
{
IList<IEnumerable<byte>> solutions = new List<IEnumerable<byte>>();
if (whichType == txnouttype.TX_MULTISIG)
{
+ // Additional verification of OP_CHECKMULTISIG arguments
byte m = solutions.First().First();
byte n = solutions.Last().First();
{
solutions = new List<IEnumerable<byte>>();
- // There are shortcuts for pay-to-script-hash and pay-to-pubkey-hash, which are more constrained than the other types:
+ // 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)
typeRet = txnouttype.TX_SCRIPTHASH;
// Take 20 bytes with offset of 2 bytes
- IEnumerable<byte> hashBytes = scriptPubKey.Enumerable.Skip(2).Take(20);
+ IEnumerable<byte> hashBytes = scriptPubKey.Bytes.Skip(2).Take(20);
solutions.Add(hashBytes);
return true;
typeRet = txnouttype.TX_PUBKEYHASH;
// Take 20 bytes with offset of 3 bytes
- IEnumerable<byte> hashBytes = scriptPubKey.Enumerable.Skip(3).Take(20);
+ IEnumerable<byte> hashBytes = scriptPubKey.Bytes.Skip(3).Take(20);
solutions.Add(hashBytes);
return true;
templateTuples.Add(
new Tuple<txnouttype, IEnumerable<byte>>(
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
templateTuples.Add(
new Tuple<txnouttype, IEnumerable<byte>>(
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
templateTuples.Add(
new Tuple<txnouttype, IEnumerable<byte>>(
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
CScript script1 = scriptPubKey;
CScript script2 = new CScript(templateTuple.Item2);
- opcodetype opcode1, opcode2;
+ instruction opcode1, opcode2;
// Compare
- WrappedList<byte> wl1 = script1.GetWrappedList();
- WrappedList<byte> wl2 = script2.GetWrappedList();
+ ByteQueue bq1 = script1.GetByteQUeue();
+ ByteQueue bq2 = script2.GetByteQUeue();
IEnumerable<byte> args1, args2;
- byte last1 = script1.Enumerable.Last();
- byte last2 = script2.Enumerable.Last();
+ int last1 = script1.Bytes.Count() -1;
+ int last2 = script2.Bytes.Count() - 1;
while (true)
{
- if (wl1.GetCurrentItem() == last1 && wl2.GetCurrentItem() == last2)
+ if (bq1.CurrentIndex == last1 && bq2.CurrentIndex == last2)
{
// Found a match
typeRet = templateTuple.Item1;
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)
+ 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
{
}
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);
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)
return false;
}
+
+ /// <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)
+ {
+ StringBuilder sb = new StringBuilder();
+ sb.AppendFormat("ERROR: SignatureHash() : nIn={0} out of range\n", nIn);
+ 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.
+ 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 = script;
+
+ // Blank out some of the outputs
+ if ((nHashType & 0x1f) == (int)sigflag.SIGHASH_NONE)
+ {
+ // Wildcard payee
+ txTmp.vout = new CTxOut[0];
+
+ // Let the others update at will
+ for (int i = 0; i < txTmp.vin.Length; i++)
+ {
+ if (i != nIn)
+ {
+ txTmp.vin[i].nSequence = 0;
+ }
+ }
+ }
+ else if ((nHashType & 0x1f) == (int)sigflag.SIGHASH_SINGLE)
+ {
+ // Only lock-in the txout payee at same index as txin
+ int nOut = nIn;
+ if (nOut >= txTmp.vout.Length)
+ {
+ StringBuilder sb = new StringBuilder();
+ sb.AppendFormat("ERROR: SignatureHash() : nOut={0} out of range\n", nOut);
+ throw new ArgumentOutOfRangeException("nOut", sb.ToString());
+ }
+ Array.Resize(ref txTmp.vout, nOut + 1);
+
+ for (int i = 0; i < nOut; i++)
+ {
+ txTmp.vout[i] = new CTxOut();
+ }
+
+ // Let the others update at will
+ for (int i = 0; i < txTmp.vin.Length; i++)
+ {
+ if (i != nIn)
+ {
+ txTmp.vin[i].nSequence = 0;
+ }
+ }
+ }
+
+ // Blank out other inputs completely, not recommended for open transactions
+ if ((nHashType & (int)sigflag.SIGHASH_ANYONECANPAY) != 0)
+ {
+ txTmp.vin[0] = txTmp.vin[nIn];
+ Array.Resize(ref txTmp.vin, 1);
+ }
+
+ // Serialize and hash
+ List<byte> b = new List<byte>();
+ b.AddRange(txTmp.Bytes);
+ b.AddRange(BitConverter.GetBytes(nHashType));
+
+ 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()
+ {
+ }
+
+ public StackMachineException(string message)
+ : base(message)
+ {
+ }
+
+ public StackMachineException(string message, Exception inner)
+ : base(message, inner)
+ {
+ }
+ }
+
+ /// <summary>
+ /// Remove last element from stack
+ /// </summary>
+ /// <param name="stack">Stack reference</param>
+ static void popstack(ref List<IEnumerable<byte>> stack)
+ {
+ int nCount = stack.Count;
+ if (nCount == 0)
+ throw new StackMachineException("popstack() : stack empty");
+ stack.RemoveAt(nCount - 1);
+ }
+
+ /// <summary>
+ /// Get element at specified stack depth
+ /// </summary>
+ /// <param name="stack">Stack reference</param>
+ /// <param name="nDepth">Depth</param>
+ /// <returns>Byte sequence</returns>
+ static IEnumerable<byte> stacktop(ref List<IEnumerable<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);
+
+ 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];
+ }
+
+ /// <summary>
+ /// Cast argument to boolean value
+ /// </summary>
+ /// <param name="value">Some byte sequence</param>
+ /// <returns></returns>
+ private static bool CastToBool(IEnumerable<byte> arg)
+ {
+ byte[] value = arg.ToArray();
+
+ for (var i = 0; i < value.Length; i++)
+ {
+ if (value[i] != 0)
+ {
+ // Can be negative zero
+ if (i == value.Length - 1 && value[i] == 0x80)
+ {
+ return false;
+ }
+
+ return true;
+ }
+ }
+
+ return false;
+ }
+
+ /// <summary>
+ /// Cast argument to integer value
+ /// </summary>
+ /// <param name="value"></param>
+ /// <returns></returns>
+ private static BigInteger CastToBigInteger(IEnumerable<byte> value)
+ {
+ if (value.Count() > 4)
+ {
+ throw new StackMachineException("CastToBigInteger() : overflow");
+ }
+
+ 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;
+
+ ByteQueue CodeQueue = script.GetByteQUeue();
+
+ List<bool> vfExec = new List<bool>();
+ List<IEnumerable<byte>> altStack = new List<IEnumerable<byte>>();
+
+ byte[] falseBytes = new byte[0];
+ byte[] trueBytes = new byte[] { 0x01 };
+
+ if (script.Bytes.Count() > 10000)
+ {
+ return false; // Size limit failed
+ }
+
+ int nOpCount = 0;
+ int nCodeHashBegin = 0;
+
+ IEnumerable<byte> pushArg;
+
+ while (GetOp(ref CodeQueue, out opcode, out pushArg)) // Read instructions
+ {
+ bool fExec = vfExec.IndexOf(false) != -1;
+
+ if (pushArg.Count() > 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 opcodes
+ //
+ 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:
+ {
+ // <expression> if [statements] [else [statements]] endif
+ bool fValue = false;
+ if (fExec)
+ {
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
+ IEnumerable<byte> 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;
+ }
+ IEnumerable<byte> vch1 = stacktop(ref stack, -2);
+ IEnumerable<byte> 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;
+ }
+ IEnumerable<byte> vch1 = stacktop(ref stack, -3);
+ IEnumerable<byte> vch2 = stacktop(ref stack, -2);
+ IEnumerable<byte> 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;
+ }
+ IEnumerable<byte> vch1 = stacktop(ref stack, -4);
+ IEnumerable<byte> 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;
+ }
+ IEnumerable<byte> vch1 = stacktop(ref stack, -6);
+ IEnumerable<byte> 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;
+ }
+
+ IEnumerable<byte> 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;
+ }
+
+ IEnumerable<byte> 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;
+ }
+
+ IEnumerable<byte> 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;
+ }
+
+ IEnumerable<byte> 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;
+ }
+ IEnumerable<byte> vch = stacktop(ref stack, -1);
+ stack.Insert(nStackDepth - 2, vch);
+ }
+ break;
+
+
+ case instruction.OP_SIZE:
+ {
+ // (in -- in size)
+ if (stack.Count() < 1)
+ {
+ return false;
+ }
+
+ BigInteger 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;
+ }
+
+ IEnumerable<byte> vch1 = stacktop(ref stack, -2);
+ IEnumerable<byte> vch2 = stacktop(ref stack, -1);
+ bool fEqual = (vch1 == 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;
+ }
+
+ BigInteger 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;
+ }
+
+ BigInteger bn1 = CastToBigInteger(stacktop(ref stack, -2));
+ BigInteger 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;
+ BigInteger bn1 = CastToBigInteger(stacktop(ref stack, -3));
+ BigInteger bn2 = CastToBigInteger(stacktop(ref stack, -2));
+ BigInteger 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;
+ IEnumerable<byte> 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.hashBytes);
+ }
+ break;
+
+ case instruction.OP_CODESEPARATOR:
+ {
+ // Hash starts after the code separator
+ nCodeHashBegin = CodeQueue.CurrentIndex;
+ }
+ break;
+
+ case instruction.OP_CHECKSIG:
+ case instruction.OP_CHECKSIGVERIFY:
+ {
+ // (sig pubkey -- bool)
+ if (stack.Count() < 2)
+ {
+ return false;
+ }
+
+ IList<byte> sigBytes = stacktop(ref stack, -2).ToList();
+ IList<byte> pubkeyBytes = stacktop(ref stack, -1).ToList();
+
+ // Subset of script starting at the most recent codeseparator
+ CScript scriptCode = new CScript(script.Bytes.Skip(nCodeHashBegin));
+
+ // There's no way for a signature to sign itself
+ scriptCode.RemovePattern(sigBytes);
+
+ bool fSuccess = IsCanonicalSignature(sigBytes, flags) && IsCanonicalPubKey(pubkeyBytes.ToList(), 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
+ CScript scriptCode = new CScript(script.Bytes.Skip(nCodeHashBegin));
+
+ // There is no way for a signature to sign itself, so we need to drop the signatures
+ for (int k = 0; k < nSigsCount; k++)
+ {
+ IEnumerable<byte> vchSig = stacktop(ref stack, -isig - k);
+ scriptCode.RemovePattern(vchSig.ToList());
+ }
+
+ bool fSuccess = true;
+ while (fSuccess && nSigsCount > 0)
+ {
+ IList<byte> sigBytes = stacktop(ref stack, -isig).ToList();
+ IList<byte> pubKeyBytes = stacktop(ref stack, -ikey).ToList();
+
+ // Check signature
+ bool fOk = IsCanonicalSignature(sigBytes, flags) && IsCanonicalPubKey(pubKeyBytes.ToList(), 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 (vfExec.Count() == 0)
+ {
+ return false;
+ }
+
+ return true;
+ }
+
+
+ static bool IsCanonicalPubKey(IList<byte> pubKeyBytes, int flags)
+ {
+ if ((flags & (int)scriptflag.SCRIPT_VERIFY_STRICTENC) == 0)
+ return true;
+
+ if (pubKeyBytes.Count < 33)
+ return false; // Non-canonical public key: too short
+ if (pubKeyBytes[0] == 0x04)
+ {
+ if (pubKeyBytes.Count != 65)
+ return false; // Non-canonical public key: invalid length for uncompressed key
+ }
+ else if (pubKeyBytes[0] == 0x02 || pubKeyBytes[0] == 0x03)
+ {
+ if (pubKeyBytes.Count != 33)
+ return false; // Non-canonical public key: invalid length for compressed key
+ }
+ else
+ {
+ return false; // Non-canonical public key: compressed nor uncompressed
+ }
+ return true;
+ }
+
+ static bool IsCanonicalSignature(IList<byte> sigBytes, int flags)
+ {
+ // STUB
+
+ return true;
+ }
+
+ /// <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;
+
+ try
+ {
+ // Trying to initialize the public key instance
+
+ pubkey = new CPubKey(pubkeyBytes);
+ }
+ catch (Exception)
+ {
+ // Exception occurred while initializing the public key
+
+ return false;
+ }
+
+ if (!pubkey.IsValid)
+ {
+ return false;
+ }
+
+ if (sigBytes.Count == 0)
+ {
+ return false;
+ }
+
+ // 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
+ sigBytes.RemoveAt(sigBytes.Count - 1);
+
+ Hash256 sighash = SignatureHash(script, txTo, nIn, nHashType);
+
+ if (!pubkey.VerifySignature(sighash, sigBytes))
+ {
+ return false;
+ }
+
+ return true;
+ }
};
}
git://git.novaco.in / NovacoinLibrary.git / blobdiff