diff options
Diffstat (limited to 'script.cpp')
| -rw-r--r-- | script.cpp | 1127 |
1 files changed, 1127 insertions, 0 deletions
diff --git a/script.cpp b/script.cpp new file mode 100644 index 0000000000..0e95af503c --- /dev/null +++ b/script.cpp @@ -0,0 +1,1127 @@ +// Copyright (c) 2009 Satoshi Nakamoto
+// Distributed under the MIT/X11 software license, see the accompanying
+// file license.txt or http://www.opensource.org/licenses/mit-license.php.
+
+#include "headers.h"
+
+bool CheckSig(vector<unsigned char> vchSig, vector<unsigned char> vchPubKey, CScript scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType);
+
+
+
+typedef vector<unsigned char> valtype;
+static const valtype vchFalse(0);
+static const valtype vchZero(0);
+static const valtype vchTrue(1, 1);
+static const CBigNum bnZero(0);
+static const CBigNum bnOne(1);
+static const CBigNum bnFalse(0);
+static const CBigNum bnTrue(1);
+
+
+bool CastToBool(const valtype& vch)
+{
+ return (CBigNum(vch) != bnZero);
+}
+
+void MakeSameSize(valtype& vch1, valtype& vch2)
+{
+ // Lengthen the shorter one
+ if (vch1.size() < vch2.size())
+ vch1.resize(vch2.size(), 0);
+ if (vch2.size() < vch1.size())
+ vch2.resize(vch1.size(), 0);
+}
+
+
+
+//
+// Script is a stack machine (like Forth) that evaluates a predicate
+// returning a bool indicating valid or not. There are no loops.
+//
+#define stacktop(i) (stack.at(stack.size()+(i)))
+#define altstacktop(i) (altstack.at(altstack.size()+(i)))
+
+bool EvalScript(const CScript& script, const CTransaction& txTo, unsigned int nIn, int nHashType,
+ vector<vector<unsigned char> >* pvStackRet)
+{
+ CAutoBN_CTX pctx;
+ CScript::const_iterator pc = script.begin();
+ CScript::const_iterator pend = script.end();
+ CScript::const_iterator pbegincodehash = script.begin();
+ vector<bool> vfExec;
+ vector<valtype> stack;
+ vector<valtype> altstack;
+ if (pvStackRet)
+ pvStackRet->clear();
+
+
+ while (pc < pend)
+ {
+ bool fExec = !count(vfExec.begin(), vfExec.end(), false);
+
+ //
+ // Read instruction
+ //
+ opcodetype opcode;
+ valtype vchPushValue;
+ if (!script.GetOp(pc, opcode, vchPushValue))
+ return false;
+
+ if (fExec && opcode <= OP_PUSHDATA4)
+ stack.push_back(vchPushValue);
+ else if (fExec || (OP_IF <= opcode && opcode <= OP_ENDIF))
+ switch (opcode)
+ {
+ //
+ // Push value
+ //
+ case OP_1NEGATE:
+ case OP_1:
+ case OP_2:
+ case OP_3:
+ case OP_4:
+ case OP_5:
+ case OP_6:
+ case OP_7:
+ case OP_8:
+ case OP_9:
+ case OP_10:
+ case OP_11:
+ case OP_12:
+ case OP_13:
+ case OP_14:
+ case OP_15:
+ case OP_16:
+ {
+ // ( -- value)
+ CBigNum bn((int)opcode - (int)(OP_1 - 1));
+ stack.push_back(bn.getvch());
+ }
+ break;
+
+
+ //
+ // Control
+ //
+ case OP_NOP:
+ break;
+
+ case OP_VER:
+ {
+ CBigNum bn(VERSION);
+ stack.push_back(bn.getvch());
+ }
+ break;
+
+ case OP_IF:
+ case OP_NOTIF:
+ case OP_VERIF:
+ case OP_VERNOTIF:
+ {
+ // <expression> if [statements] [else [statements]] endif
+ bool fValue = false;
+ if (fExec)
+ {
+ if (stack.size() < 1)
+ return false;
+ valtype& vch = stacktop(-1);
+ if (opcode == OP_VERIF || opcode == OP_VERNOTIF)
+ fValue = (CBigNum(VERSION) >= CBigNum(vch));
+ else
+ fValue = CastToBool(vch);
+ if (opcode == OP_NOTIF || opcode == OP_VERNOTIF)
+ fValue = !fValue;
+ stack.pop_back();
+ }
+ vfExec.push_back(fValue);
+ }
+ break;
+
+ case OP_ELSE:
+ {
+ if (vfExec.empty())
+ return false;
+ vfExec.back() = !vfExec.back();
+ }
+ break;
+
+ case OP_ENDIF:
+ {
+ if (vfExec.empty())
+ return false;
+ vfExec.pop_back();
+ }
+ break;
+
+ case OP_VERIFY:
+ {
+ // (true -- ) or
+ // (false -- false) and return
+ if (stack.size() < 1)
+ return false;
+ bool fValue = CastToBool(stacktop(-1));
+ if (fValue)
+ stack.pop_back();
+ else
+ pc = pend;
+ }
+ break;
+
+ case OP_RETURN:
+ {
+ pc = pend;
+ }
+ break;
+
+
+ //
+ // Stack ops
+ //
+ case OP_TOALTSTACK:
+ {
+ if (stack.size() < 1)
+ return false;
+ altstack.push_back(stacktop(-1));
+ stack.pop_back();
+ }
+ break;
+
+ case OP_FROMALTSTACK:
+ {
+ if (altstack.size() < 1)
+ return false;
+ stack.push_back(altstacktop(-1));
+ altstack.pop_back();
+ }
+ break;
+
+ case OP_2DROP:
+ {
+ // (x1 x2 -- )
+ stack.pop_back();
+ stack.pop_back();
+ }
+ break;
+
+ case OP_2DUP:
+ {
+ // (x1 x2 -- x1 x2 x1 x2)
+ if (stack.size() < 2)
+ return false;
+ valtype vch1 = stacktop(-2);
+ valtype vch2 = stacktop(-1);
+ stack.push_back(vch1);
+ stack.push_back(vch2);
+ }
+ break;
+
+ case OP_3DUP:
+ {
+ // (x1 x2 x3 -- x1 x2 x3 x1 x2 x3)
+ if (stack.size() < 3)
+ return false;
+ valtype vch1 = stacktop(-3);
+ valtype vch2 = stacktop(-2);
+ valtype vch3 = stacktop(-1);
+ stack.push_back(vch1);
+ stack.push_back(vch2);
+ stack.push_back(vch3);
+ }
+ break;
+
+ case OP_2OVER:
+ {
+ // (x1 x2 x3 x4 -- x1 x2 x3 x4 x1 x2)
+ if (stack.size() < 4)
+ return false;
+ valtype vch1 = stacktop(-4);
+ valtype vch2 = stacktop(-3);
+ stack.push_back(vch1);
+ stack.push_back(vch2);
+ }
+ break;
+
+ case OP_2ROT:
+ {
+ // (x1 x2 x3 x4 x5 x6 -- x3 x4 x5 x6 x1 x2)
+ if (stack.size() < 6)
+ return false;
+ valtype vch1 = stacktop(-6);
+ valtype vch2 = stacktop(-5);
+ stack.erase(stack.end()-6, stack.end()-4);
+ stack.push_back(vch1);
+ stack.push_back(vch2);
+ }
+ break;
+
+ case OP_2SWAP:
+ {
+ // (x1 x2 x3 x4 -- x3 x4 x1 x2)
+ if (stack.size() < 4)
+ return false;
+ swap(stacktop(-4), stacktop(-2));
+ swap(stacktop(-3), stacktop(-1));
+ }
+ break;
+
+ case OP_IFDUP:
+ {
+ // (x - 0 | x x)
+ if (stack.size() < 1)
+ return false;
+ valtype vch = stacktop(-1);
+ if (CastToBool(vch))
+ stack.push_back(vch);
+ }
+ break;
+
+ case OP_DEPTH:
+ {
+ // -- stacksize
+ CBigNum bn(stack.size());
+ stack.push_back(bn.getvch());
+ }
+ break;
+
+ case OP_DROP:
+ {
+ // (x -- )
+ if (stack.size() < 1)
+ return false;
+ stack.pop_back();
+ }
+ break;
+
+ case OP_DUP:
+ {
+ // (x -- x x)
+ if (stack.size() < 1)
+ return false;
+ valtype vch = stacktop(-1);
+ stack.push_back(vch);
+ }
+ break;
+
+ case OP_NIP:
+ {
+ // (x1 x2 -- x2)
+ if (stack.size() < 2)
+ return false;
+ stack.erase(stack.end() - 2);
+ }
+ break;
+
+ case OP_OVER:
+ {
+ // (x1 x2 -- x1 x2 x1)
+ if (stack.size() < 2)
+ return false;
+ valtype vch = stacktop(-2);
+ stack.push_back(vch);
+ }
+ break;
+
+ case OP_PICK:
+ case OP_ROLL:
+ {
+ // (xn ... x2 x1 x0 n - xn ... x2 x1 x0 xn)
+ // (xn ... x2 x1 x0 n - ... x2 x1 x0 xn)
+ if (stack.size() < 2)
+ return false;
+ int n = CBigNum(stacktop(-1)).getint();
+ stack.pop_back();
+ if (n < 0 || n >= stack.size())
+ return false;
+ valtype vch = stacktop(-n-1);
+ if (opcode == OP_ROLL)
+ stack.erase(stack.end()-n-1);
+ stack.push_back(vch);
+ }
+ break;
+
+ case OP_ROT:
+ {
+ // (x1 x2 x3 -- x2 x3 x1)
+ // x2 x1 x3 after first swap
+ // x2 x3 x1 after second swap
+ if (stack.size() < 3)
+ return false;
+ swap(stacktop(-3), stacktop(-2));
+ swap(stacktop(-2), stacktop(-1));
+ }
+ break;
+
+ case OP_SWAP:
+ {
+ // (x1 x2 -- x2 x1)
+ if (stack.size() < 2)
+ return false;
+ swap(stacktop(-2), stacktop(-1));
+ }
+ break;
+
+ case OP_TUCK:
+ {
+ // (x1 x2 -- x2 x1 x2)
+ if (stack.size() < 2)
+ return false;
+ valtype vch = stacktop(-1);
+ stack.insert(stack.end()-2, vch);
+ }
+ break;
+
+
+ //
+ // Splice ops
+ //
+ case OP_CAT:
+ {
+ // (x1 x2 -- out)
+ if (stack.size() < 2)
+ return false;
+ valtype& vch1 = stacktop(-2);
+ valtype& vch2 = stacktop(-1);
+ vch1.insert(vch1.end(), vch2.begin(), vch2.end());
+ stack.pop_back();
+ }
+ break;
+
+ case OP_SUBSTR:
+ {
+ // (in begin size -- out)
+ if (stack.size() < 3)
+ return false;
+ valtype& vch = stacktop(-3);
+ int nBegin = CBigNum(stacktop(-2)).getint();
+ int nEnd = nBegin + CBigNum(stacktop(-1)).getint();
+ if (nBegin < 0 || nEnd < nBegin)
+ return false;
+ if (nBegin > vch.size())
+ nBegin = vch.size();
+ if (nEnd > vch.size())
+ nEnd = vch.size();
+ vch.erase(vch.begin() + nEnd, vch.end());
+ vch.erase(vch.begin(), vch.begin() + nBegin);
+ stack.pop_back();
+ stack.pop_back();
+ }
+ break;
+
+ case OP_LEFT:
+ case OP_RIGHT:
+ {
+ // (in size -- out)
+ if (stack.size() < 2)
+ return false;
+ valtype& vch = stacktop(-2);
+ int nSize = CBigNum(stacktop(-1)).getint();
+ if (nSize < 0)
+ return false;
+ if (nSize > vch.size())
+ nSize = vch.size();
+ if (opcode == OP_LEFT)
+ vch.erase(vch.begin() + nSize, vch.end());
+ else
+ vch.erase(vch.begin(), vch.end() - nSize);
+ stack.pop_back();
+ }
+ break;
+
+ case OP_SIZE:
+ {
+ // (in -- in size)
+ if (stack.size() < 1)
+ return false;
+ CBigNum bn(stacktop(-1).size());
+ stack.push_back(bn.getvch());
+ }
+ break;
+
+
+ //
+ // Bitwise logic
+ //
+ case OP_INVERT:
+ {
+ // (in - out)
+ if (stack.size() < 1)
+ return false;
+ valtype& vch = stacktop(-1);
+ for (int i = 0; i < vch.size(); i++)
+ vch[i] = ~vch[i];
+ }
+ break;
+
+ case OP_AND:
+ case OP_OR:
+ case OP_XOR:
+ {
+ // (x1 x2 - out)
+ if (stack.size() < 2)
+ return false;
+ valtype& vch1 = stacktop(-2);
+ valtype& vch2 = stacktop(-1);
+ MakeSameSize(vch1, vch2);
+ if (opcode == OP_AND)
+ {
+ for (int i = 0; i < vch1.size(); i++)
+ vch1[i] &= vch2[i];
+ }
+ else if (opcode == OP_OR)
+ {
+ for (int i = 0; i < vch1.size(); i++)
+ vch1[i] |= vch2[i];
+ }
+ else if (opcode == OP_XOR)
+ {
+ for (int i = 0; i < vch1.size(); i++)
+ vch1[i] ^= vch2[i];
+ }
+ stack.pop_back();
+ }
+ break;
+
+ case OP_EQUAL:
+ case OP_EQUALVERIFY:
+ //case OP_NOTEQUAL: // use OP_NUMNOTEQUAL
+ {
+ // (x1 x2 - bool)
+ if (stack.size() < 2)
+ return false;
+ valtype& vch1 = stacktop(-2);
+ valtype& vch2 = stacktop(-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 == OP_NOTEQUAL)
+ // fEqual = !fEqual;
+ stack.pop_back();
+ stack.pop_back();
+ stack.push_back(fEqual ? vchTrue : vchFalse);
+ if (opcode == OP_EQUALVERIFY)
+ {
+ if (fEqual)
+ stack.pop_back();
+ else
+ pc = pend;
+ }
+ }
+ break;
+
+
+ //
+ // Numeric
+ //
+ case OP_1ADD:
+ case OP_1SUB:
+ case OP_2MUL:
+ case OP_2DIV:
+ case OP_NEGATE:
+ case OP_ABS:
+ case OP_NOT:
+ case OP_0NOTEQUAL:
+ {
+ // (in -- out)
+ if (stack.size() < 1)
+ return false;
+ CBigNum bn(stacktop(-1));
+ switch (opcode)
+ {
+ case OP_1ADD: bn += bnOne; break;
+ case OP_1SUB: bn -= bnOne; break;
+ case OP_2MUL: bn <<= 1; break;
+ case OP_2DIV: bn >>= 1; break;
+ case OP_NEGATE: bn = -bn; break;
+ case OP_ABS: if (bn < bnZero) bn = -bn; break;
+ case OP_NOT: bn = (bn == bnZero); break;
+ case OP_0NOTEQUAL: bn = (bn != bnZero); break;
+ }
+ stack.pop_back();
+ stack.push_back(bn.getvch());
+ }
+ break;
+
+ case OP_ADD:
+ case OP_SUB:
+ case OP_MUL:
+ case OP_DIV:
+ case OP_MOD:
+ case OP_LSHIFT:
+ case OP_RSHIFT:
+ case OP_BOOLAND:
+ case OP_BOOLOR:
+ case OP_NUMEQUAL:
+ case OP_NUMEQUALVERIFY:
+ case OP_NUMNOTEQUAL:
+ case OP_LESSTHAN:
+ case OP_GREATERTHAN:
+ case OP_LESSTHANOREQUAL:
+ case OP_GREATERTHANOREQUAL:
+ case OP_MIN:
+ case OP_MAX:
+ {
+ // (x1 x2 -- out)
+ if (stack.size() < 2)
+ return false;
+ CBigNum bn1(stacktop(-2));
+ CBigNum bn2(stacktop(-1));
+ CBigNum bn;
+ switch (opcode)
+ {
+ case OP_ADD:
+ bn = bn1 + bn2;
+ break;
+
+ case OP_SUB:
+ bn = bn1 - bn2;
+ break;
+
+ case OP_MUL:
+ if (!BN_mul(&bn, &bn1, &bn2, pctx))
+ return false;
+ break;
+
+ case OP_DIV:
+ if (!BN_div(&bn, NULL, &bn1, &bn2, pctx))
+ return false;
+ break;
+
+ case OP_MOD:
+ if (!BN_mod(&bn, &bn1, &bn2, pctx))
+ return false;
+ break;
+
+ case OP_LSHIFT:
+ if (bn2 < bnZero)
+ return false;
+ bn = bn1 << bn2.getulong();
+ break;
+
+ case OP_RSHIFT:
+ if (bn2 < bnZero)
+ return false;
+ bn = bn1 >> bn2.getulong();
+ break;
+
+ case OP_BOOLAND: bn = (bn1 != bnZero && bn2 != bnZero); break;
+ case OP_BOOLOR: bn = (bn1 != bnZero || bn2 != bnZero); break;
+ case OP_NUMEQUAL: bn = (bn1 == bn2); break;
+ case OP_NUMEQUALVERIFY: bn = (bn1 == bn2); break;
+ case OP_NUMNOTEQUAL: bn = (bn1 != bn2); break;
+ case OP_LESSTHAN: bn = (bn1 < bn2); break;
+ case OP_GREATERTHAN: bn = (bn1 > bn2); break;
+ case OP_LESSTHANOREQUAL: bn = (bn1 <= bn2); break;
+ case OP_GREATERTHANOREQUAL: bn = (bn1 >= bn2); break;
+ case OP_MIN: bn = (bn1 < bn2 ? bn1 : bn2); break;
+ case OP_MAX: bn = (bn1 > bn2 ? bn1 : bn2); break;
+ }
+ stack.pop_back();
+ stack.pop_back();
+ stack.push_back(bn.getvch());
+
+ if (opcode == OP_NUMEQUALVERIFY)
+ {
+ if (CastToBool(stacktop(-1)))
+ stack.pop_back();
+ else
+ pc = pend;
+ }
+ }
+ break;
+
+ case OP_WITHIN:
+ {
+ // (x min max -- out)
+ if (stack.size() < 3)
+ return false;
+ CBigNum bn1(stacktop(-3));
+ CBigNum bn2(stacktop(-2));
+ CBigNum bn3(stacktop(-1));
+ bool fValue = (bn2 <= bn1 && bn1 < bn3);
+ stack.pop_back();
+ stack.pop_back();
+ stack.pop_back();
+ stack.push_back(fValue ? vchTrue : vchFalse);
+ }
+ break;
+
+
+ //
+ // Crypto
+ //
+ case OP_RIPEMD160:
+ case OP_SHA1:
+ case OP_SHA256:
+ case OP_HASH160:
+ case OP_HASH256:
+ {
+ // (in -- hash)
+ if (stack.size() < 1)
+ return false;
+ valtype& vch = stacktop(-1);
+ valtype vchHash(opcode == OP_RIPEMD160 || opcode == OP_SHA1 || opcode == OP_HASH160 ? 20 : 32);
+ if (opcode == OP_RIPEMD160)
+ RIPEMD160(&vch[0], vch.size(), &vchHash[0]);
+ else if (opcode == OP_SHA1)
+ SHA1(&vch[0], vch.size(), &vchHash[0]);
+ else if (opcode == OP_SHA256)
+ SHA256(&vch[0], vch.size(), &vchHash[0]);
+ else if (opcode == OP_HASH160)
+ {
+ uint160 hash160 = Hash160(vch);
+ memcpy(&vchHash[0], &hash160, sizeof(hash160));
+ }
+ else if (opcode == OP_HASH256)
+ {
+ uint256 hash = Hash(vch.begin(), vch.end());
+ memcpy(&vchHash[0], &hash, sizeof(hash));
+ }
+ stack.pop_back();
+ stack.push_back(vchHash);
+ }
+ break;
+
+ case OP_CODESEPARATOR:
+ {
+ // Hash starts after the code separator
+ pbegincodehash = pc;
+ }
+ break;
+
+ case OP_CHECKSIG:
+ case OP_CHECKSIGVERIFY:
+ {
+ // (sig pubkey -- bool)
+ if (stack.size() < 2)
+ return false;
+
+ valtype& vchSig = stacktop(-2);
+ valtype& vchPubKey = stacktop(-1);
+
+ ////// debug print
+ //PrintHex(vchSig.begin(), vchSig.end(), "sig: %s\n");
+ //PrintHex(vchPubKey.begin(), vchPubKey.end(), "pubkey: %s\n");
+
+ // Subset of script starting at the most recent codeseparator
+ CScript scriptCode(pbegincodehash, pend);
+
+ // Drop the signature, since there's no way for a signature to sign itself
+ scriptCode.FindAndDelete(CScript(vchSig));
+
+ bool fSuccess = CheckSig(vchSig, vchPubKey, scriptCode, txTo, nIn, nHashType);
+
+ stack.pop_back();
+ stack.pop_back();
+ stack.push_back(fSuccess ? vchTrue : vchFalse);
+ if (opcode == OP_CHECKSIGVERIFY)
+ {
+ if (fSuccess)
+ stack.pop_back();
+ else
+ pc = pend;
+ }
+ }
+ break;
+
+ case OP_CHECKMULTISIG:
+ case OP_CHECKMULTISIGVERIFY:
+ {
+ // ([sig ...] num_of_signatures [pubkey ...] num_of_pubkeys -- bool)
+
+ int i = 1;
+ if (stack.size() < i)
+ return false;
+
+ int nKeysCount = CBigNum(stacktop(-i)).getint();
+ if (nKeysCount < 0)
+ return false;
+ int ikey = ++i;
+ i += nKeysCount;
+ if (stack.size() < i)
+ return false;
+
+ int nSigsCount = CBigNum(stacktop(-i)).getint();
+ if (nSigsCount < 0 || nSigsCount > nKeysCount)
+ return false;
+ int isig = ++i;
+ i += nSigsCount;
+ if (stack.size() < i)
+ return false;
+
+ // Subset of script starting at the most recent codeseparator
+ CScript scriptCode(pbegincodehash, pend);
+
+ // Drop the signatures, since there's no way for a signature to sign itself
+ for (int i = 0; i < nSigsCount; i++)
+ {
+ valtype& vchSig = stacktop(-isig-i);
+ scriptCode.FindAndDelete(CScript(vchSig));
+ }
+
+ bool fSuccess = true;
+ while (fSuccess && nSigsCount > 0)
+ {
+ valtype& vchSig = stacktop(-isig);
+ valtype& vchPubKey = stacktop(-ikey);
+
+ // Check signature
+ if (CheckSig(vchSig, vchPubKey, scriptCode, txTo, nIn, nHashType))
+ {
+ 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-- > 0)
+ stack.pop_back();
+ stack.push_back(fSuccess ? vchTrue : vchFalse);
+
+ if (opcode == OP_CHECKMULTISIGVERIFY)
+ {
+ if (fSuccess)
+ stack.pop_back();
+ else
+ pc = pend;
+ }
+ }
+ break;
+
+ default:
+ return false;
+ }
+ }
+
+
+ if (pvStackRet)
+ *pvStackRet = stack;
+ return (stack.empty() ? false : CastToBool(stack.back()));
+}
+
+#undef top
+
+
+
+
+
+
+
+
+
+uint256 SignatureHash(CScript scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType)
+{
+ if (nIn >= txTo.vin.size())
+ {
+ printf("ERROR: SignatureHash() : nIn=%d out of range\n", nIn);
+ return 1;
+ }
+ CTransaction txTmp(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.FindAndDelete(CScript(OP_CODESEPARATOR));
+
+ // Blank out other inputs' signatures
+ for (int i = 0; i < txTmp.vin.size(); i++)
+ txTmp.vin[i].scriptSig = CScript();
+ txTmp.vin[nIn].scriptSig = scriptCode;
+
+ // Blank out some of the outputs
+ if ((nHashType & 0x1f) == SIGHASH_NONE)
+ {
+ // Wildcard payee
+ txTmp.vout.clear();
+
+ // Let the others update at will
+ for (int i = 0; i < txTmp.vin.size(); i++)
+ if (i != nIn)
+ txTmp.vin[i].nSequence = 0;
+ }
+ else if ((nHashType & 0x1f) == SIGHASH_SINGLE)
+ {
+ // Only lockin the txout payee at same index as txin
+ unsigned int nOut = nIn;
+ if (nOut >= txTmp.vout.size())
+ {
+ printf("ERROR: SignatureHash() : nOut=%d out of range\n", nOut);
+ return 1;
+ }
+ txTmp.vout.resize(nOut+1);
+ for (int i = 0; i < nOut; i++)
+ txTmp.vout[i].SetNull();
+
+ // Let the others update at will
+ for (int i = 0; i < txTmp.vin.size(); i++)
+ if (i != nIn)
+ txTmp.vin[i].nSequence = 0;
+ }
+
+ // Blank out other inputs completely, not recommended for open transactions
+ if (nHashType & SIGHASH_ANYONECANPAY)
+ {
+ txTmp.vin[0] = txTmp.vin[nIn];
+ txTmp.vin.resize(1);
+ }
+
+ // Serialize and hash
+ CDataStream ss(SER_GETHASH);
+ ss.reserve(10000);
+ ss << txTmp << nHashType;
+ return Hash(ss.begin(), ss.end());
+}
+
+
+bool CheckSig(vector<unsigned char> vchSig, vector<unsigned char> vchPubKey, CScript scriptCode,
+ const CTransaction& txTo, unsigned int nIn, int nHashType)
+{
+ CKey key;
+ if (!key.SetPubKey(vchPubKey))
+ return false;
+
+ // Hash type is one byte tacked on to the end of the signature
+ if (vchSig.empty())
+ return false;
+ if (nHashType == 0)
+ nHashType = vchSig.back();
+ else if (nHashType != vchSig.back())
+ return false;
+ vchSig.pop_back();
+
+ if (key.Verify(SignatureHash(scriptCode, txTo, nIn, nHashType), vchSig))
+ return true;
+
+ return false;
+}
+
+
+
+
+
+
+
+
+
+
+
+bool Solver(const CScript& scriptPubKey, vector<pair<opcodetype, valtype> >& vSolutionRet)
+{
+ // Templates
+ static vector<CScript> vTemplates;
+ if (vTemplates.empty())
+ {
+ // Standard tx, sender provides pubkey, receiver adds signature
+ vTemplates.push_back(CScript() << OP_PUBKEY << OP_CHECKSIG);
+
+ // Short account number tx, sender provides hash of pubkey, receiver provides signature and pubkey
+ vTemplates.push_back(CScript() << OP_DUP << OP_HASH160 << OP_PUBKEYHASH << OP_EQUALVERIFY << OP_CHECKSIG);
+ }
+
+ // Scan templates
+ const CScript& script1 = scriptPubKey;
+ foreach(const CScript& script2, vTemplates)
+ {
+ vSolutionRet.clear();
+ opcodetype opcode1, opcode2;
+ vector<unsigned char> vch1, vch2;
+
+ // Compare
+ CScript::const_iterator pc1 = script1.begin();
+ CScript::const_iterator pc2 = script2.begin();
+ loop
+ {
+ bool f1 = script1.GetOp(pc1, opcode1, vch1);
+ bool f2 = script2.GetOp(pc2, opcode2, vch2);
+ if (!f1 && !f2)
+ {
+ // Success
+ reverse(vSolutionRet.begin(), vSolutionRet.end());
+ return true;
+ }
+ else if (f1 != f2)
+ {
+ break;
+ }
+ else if (opcode2 == OP_PUBKEY)
+ {
+ if (vch1.size() <= sizeof(uint256))
+ break;
+ vSolutionRet.push_back(make_pair(opcode2, vch1));
+ }
+ else if (opcode2 == OP_PUBKEYHASH)
+ {
+ if (vch1.size() != sizeof(uint160))
+ break;
+ vSolutionRet.push_back(make_pair(opcode2, vch1));
+ }
+ else if (opcode1 != opcode2)
+ {
+ break;
+ }
+ }
+ }
+
+ vSolutionRet.clear();
+ return false;
+}
+
+
+bool Solver(const CScript& scriptPubKey, uint256 hash, int nHashType, CScript& scriptSigRet)
+{
+ scriptSigRet.clear();
+
+ vector<pair<opcodetype, valtype> > vSolution;
+ if (!Solver(scriptPubKey, vSolution))
+ return false;
+
+ // Compile solution
+ CRITICAL_BLOCK(cs_mapKeys)
+ {
+ foreach(PAIRTYPE(opcodetype, valtype)& item, vSolution)
+ {
+ if (item.first == OP_PUBKEY)
+ {
+ // Sign
+ const valtype& vchPubKey = item.second;
+ if (!mapKeys.count(vchPubKey))
+ return false;
+ if (hash != 0)
+ {
+ vector<unsigned char> vchSig;
+ if (!CKey::Sign(mapKeys[vchPubKey], hash, vchSig))
+ return false;
+ vchSig.push_back((unsigned char)nHashType);
+ scriptSigRet << vchSig;
+ }
+ }
+ else if (item.first == OP_PUBKEYHASH)
+ {
+ // Sign and give pubkey
+ map<uint160, valtype>::iterator mi = mapPubKeys.find(uint160(item.second));
+ if (mi == mapPubKeys.end())
+ return false;
+ const vector<unsigned char>& vchPubKey = (*mi).second;
+ if (!mapKeys.count(vchPubKey))
+ return false;
+ if (hash != 0)
+ {
+ vector<unsigned char> vchSig;
+ if (!CKey::Sign(mapKeys[vchPubKey], hash, vchSig))
+ return false;
+ vchSig.push_back((unsigned char)nHashType);
+ scriptSigRet << vchSig << vchPubKey;
+ }
+ }
+ }
+ }
+
+ return true;
+}
+
+
+bool IsMine(const CScript& scriptPubKey)
+{
+ CScript scriptSig;
+ return Solver(scriptPubKey, 0, 0, scriptSig);
+}
+
+
+bool ExtractPubKey(const CScript& scriptPubKey, bool fMineOnly, vector<unsigned char>& vchPubKeyRet)
+{
+ vchPubKeyRet.clear();
+
+ vector<pair<opcodetype, valtype> > vSolution;
+ if (!Solver(scriptPubKey, vSolution))
+ return false;
+
+ CRITICAL_BLOCK(cs_mapKeys)
+ {
+ foreach(PAIRTYPE(opcodetype, valtype)& item, vSolution)
+ {
+ valtype vchPubKey;
+ if (item.first == OP_PUBKEY)
+ {
+ vchPubKey = item.second;
+ }
+ else if (item.first == OP_PUBKEYHASH)
+ {
+ map<uint160, valtype>::iterator mi = mapPubKeys.find(uint160(item.second));
+ if (mi == mapPubKeys.end())
+ continue;
+ vchPubKey = (*mi).second;
+ }
+ if (!fMineOnly || mapKeys.count(vchPubKey))
+ {
+ vchPubKeyRet = vchPubKey;
+ return true;
+ }
+ }
+ }
+ return false;
+}
+
+
+bool ExtractHash160(const CScript& scriptPubKey, uint160& hash160Ret)
+{
+ hash160Ret = 0;
+
+ vector<pair<opcodetype, valtype> > vSolution;
+ if (!Solver(scriptPubKey, vSolution))
+ return false;
+
+ foreach(PAIRTYPE(opcodetype, valtype)& item, vSolution)
+ {
+ if (item.first == OP_PUBKEYHASH)
+ {
+ hash160Ret = uint160(item.second);
+ return true;
+ }
+ }
+ return false;
+}
+
+
+bool SignSignature(const CTransaction& txFrom, CTransaction& txTo, unsigned int nIn, int nHashType, CScript scriptPrereq)
+{
+ assert(nIn < txTo.vin.size());
+ CTxIn& txin = txTo.vin[nIn];
+ assert(txin.prevout.n < txFrom.vout.size());
+ const CTxOut& txout = txFrom.vout[txin.prevout.n];
+
+ // Leave out the signature from the hash, since a signature can't sign itself.
+ // The checksig op will also drop the signatures from its hash.
+ uint256 hash = SignatureHash(scriptPrereq + txout.scriptPubKey, txTo, nIn, nHashType);
+
+ if (!Solver(txout.scriptPubKey, hash, nHashType, txin.scriptSig))
+ return false;
+
+ txin.scriptSig = scriptPrereq + txin.scriptSig;
+
+ // Test solution
+ if (scriptPrereq.empty())
+ if (!EvalScript(txin.scriptSig + CScript(OP_CODESEPARATOR) + txout.scriptPubKey, txTo, nIn))
+ return false;
+
+ return true;
+}
+
+
+bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsigned int nIn, int nHashType)
+{
+ assert(nIn < txTo.vin.size());
+ const CTxIn& txin = txTo.vin[nIn];
+ if (txin.prevout.n >= txFrom.vout.size())
+ return false;
+ const CTxOut& txout = txFrom.vout[txin.prevout.n];
+
+ if (txin.prevout.hash != txFrom.GetHash())
+ return false;
+
+ return EvalScript(txin.scriptSig + CScript(OP_CODESEPARATOR) + txout.scriptPubKey, txTo, nIn, nHashType);
+}
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