#include "bignum.h"
#include "key.h"
#include "main.h"
+#include "sync.h"
#include "util.h"
-bool CheckSig(vector<unsigned char> vchSig, vector<unsigned char> vchPubKey, CScript scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType);
+bool CheckSig(vector<unsigned char> vchSig, const vector<unsigned char> &vchPubKey, const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, int flags);
-
-
-typedef vector<unsigned char> valtype;
static const valtype vchFalse(0);
static const valtype vchZero(0);
static const valtype vchTrue(1, 1);
return false;
}
+//
+// WARNING: This does not work as expected for signed integers; the sign-bit
+// is left in place as the integer is zero-extended. The correct behavior
+// would be to move the most significant bit of the last byte during the
+// resize process. MakeSameSize() is currently only used by the disabled
+// opcodes OP_AND, OP_OR, and OP_XOR.
+//
void MakeSameSize(valtype& vch1, valtype& vch2)
{
// Lengthen the shorter one
if (vch1.size() < vch2.size())
+ // PATCH:
+ // +unsigned char msb = vch1[vch1.size()-1];
+ // +vch1[vch1.size()-1] &= 0x7f;
+ // vch1.resize(vch2.size(), 0);
+ // +vch1[vch1.size()-1] = msb;
vch1.resize(vch2.size(), 0);
if (vch2.size() < vch1.size())
+ // PATCH:
+ // +unsigned char msb = vch2[vch2.size()-1];
+ // +vch2[vch2.size()-1] &= 0x7f;
+ // vch2.resize(vch1.size(), 0);
+ // +vch2[vch2.size()-1] = msb;
vch2.resize(vch1.size(), 0);
}
case TX_PUBKEYHASH: return "pubkeyhash";
case TX_SCRIPTHASH: return "scripthash";
case TX_MULTISIG: return "multisig";
+ case TX_NULL_DATA: return "nulldata";
}
return NULL;
}
// template matching params
case OP_PUBKEYHASH : return "OP_PUBKEYHASH";
case OP_PUBKEY : return "OP_PUBKEY";
+ case OP_SMALLDATA : return "OP_SMALLDATA";
case OP_INVALIDOPCODE : return "OP_INVALIDOPCODE";
default:
}
}
-bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, int nHashType)
+bool IsCanonicalPubKey(const valtype &vchPubKey, unsigned int flags) {
+ if (!(flags & SCRIPT_VERIFY_STRICTENC))
+ return true;
+
+ if (vchPubKey.size() < 33)
+ return error("Non-canonical public key: too short");
+ if (vchPubKey[0] == 0x04) {
+ if (vchPubKey.size() != 65)
+ return error("Non-canonical public key: invalid length for uncompressed key");
+ } else if (vchPubKey[0] == 0x02 || vchPubKey[0] == 0x03) {
+ if (vchPubKey.size() != 33)
+ return error("Non-canonical public key: invalid length for compressed key");
+ } else {
+ return error("Non-canonical public key: compressed nor uncompressed");
+ }
+ return true;
+}
+
+bool IsCanonicalSignature(const valtype &vchSig, unsigned int flags) {
+ if (!(flags & SCRIPT_VERIFY_STRICTENC))
+ return true;
+
+ // See https://bitcointalk.org/index.php?topic=8392.msg127623#msg127623
+ // A canonical signature exists of: <30> <total len> <02> <len R> <R> <02> <len S> <S> <hashtype>
+ // Where R and S are not negative (their first byte has its highest bit not set), and not
+ // excessively padded (do not start with a 0 byte, unless an otherwise negative number follows,
+ // in which case a single 0 byte is necessary and even required).
+ if (vchSig.size() < 9)
+ return error("Non-canonical signature: too short");
+ if (vchSig.size() > 73)
+ return error("Non-canonical signature: too long");
+ unsigned char nHashType = vchSig[vchSig.size() - 1] & (~(SIGHASH_ANYONECANPAY));
+ if (nHashType < SIGHASH_ALL || nHashType > SIGHASH_SINGLE)
+ return error("Non-canonical signature: unknown hashtype byte");
+ if (vchSig[0] != 0x30)
+ return error("Non-canonical signature: wrong type");
+ if (vchSig[1] != vchSig.size()-3)
+ return error("Non-canonical signature: wrong length marker");
+ unsigned int nLenR = vchSig[3];
+ if (5 + nLenR >= vchSig.size())
+ return error("Non-canonical signature: S length misplaced");
+ unsigned int nLenS = vchSig[5+nLenR];
+ if ((unsigned long)(nLenR+nLenS+7) != vchSig.size())
+ return error("Non-canonical signature: R+S length mismatch");
+
+ const unsigned char *R = &vchSig[4];
+ if (R[-2] != 0x02)
+ return error("Non-canonical signature: R value type mismatch");
+ if (nLenR == 0)
+ return error("Non-canonical signature: R length is zero");
+ if (R[0] & 0x80)
+ return error("Non-canonical signature: R value negative");
+ if (nLenR > 1 && (R[0] == 0x00) && !(R[1] & 0x80))
+ return error("Non-canonical signature: R value excessively padded");
+
+ const unsigned char *S = &vchSig[6+nLenR];
+ if (S[-2] != 0x02)
+ return error("Non-canonical signature: S value type mismatch");
+ if (nLenS == 0)
+ return error("Non-canonical signature: S length is zero");
+ if (S[0] & 0x80)
+ return error("Non-canonical signature: S value negative");
+ if (nLenS > 1 && (S[0] == 0x00) && !(S[1] & 0x80))
+ return error("Non-canonical signature: S value excessively padded");
+
+ if (flags & SCRIPT_VERIFY_LOW_S) {
+ if (!CKey::CheckSignatureElement(S, nLenS, true))
+ return error("Non-canonical signature: S value is unnecessarily high");
+ }
+
+ return true;
+}
+
+bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, unsigned int flags, int nHashType)
{
CAutoBN_CTX pctx;
CScript::const_iterator pc = script.begin();
return false;
int nOpCount = 0;
-
try
{
while (pc < pend)
//
if (!script.GetOp(pc, opcode, vchPushValue))
return false;
- if (vchPushValue.size() > 520)
+ if (vchPushValue.size() > MAX_SCRIPT_ELEMENT_SIZE)
return false;
if (opcode > OP_16 && ++nOpCount > 201)
return false;
opcode == OP_MOD ||
opcode == OP_LSHIFT ||
opcode == OP_RSHIFT)
- return false;
+ return false; // Disabled opcodes.
if (fExec && 0 <= opcode && opcode <= OP_PUSHDATA4)
stack.push_back(vchPushValue);
case OP_DEPTH:
{
// -- stacksize
- CBigNum bn(stack.size());
+ CBigNum bn((uint16_t) stack.size());
stack.push_back(bn.getvch());
}
break;
// (xn ... x2 x1 x0 n - ... x2 x1 x0 xn)
if (stack.size() < 2)
return false;
- int n = CastToBigNum(stacktop(-1)).getint();
+ int n = CastToBigNum(stacktop(-1)).getint32();
popstack(stack);
if (n < 0 || n >= (int)stack.size())
return false;
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());
- popstack(stack);
- if (stacktop(-1).size() > 520)
- return false;
- }
- break;
-
- case OP_SUBSTR:
- {
- // (in begin size -- out)
- if (stack.size() < 3)
- return false;
- valtype& vch = stacktop(-3);
- int nBegin = CastToBigNum(stacktop(-2)).getint();
- int nEnd = nBegin + CastToBigNum(stacktop(-1)).getint();
- if (nBegin < 0 || nEnd < nBegin)
- return false;
- if (nBegin > (int)vch.size())
- nBegin = vch.size();
- if (nEnd > (int)vch.size())
- nEnd = vch.size();
- vch.erase(vch.begin() + nEnd, vch.end());
- vch.erase(vch.begin(), vch.begin() + nBegin);
- popstack(stack);
- popstack(stack);
- }
- break;
-
- case OP_LEFT:
- case OP_RIGHT:
- {
- // (in size -- out)
- if (stack.size() < 2)
- return false;
- valtype& vch = stacktop(-2);
- int nSize = CastToBigNum(stacktop(-1)).getint();
- if (nSize < 0)
- return false;
- if (nSize > (int)vch.size())
- nSize = vch.size();
- if (opcode == OP_LEFT)
- vch.erase(vch.begin() + nSize, vch.end());
- else
- vch.erase(vch.begin(), vch.end() - nSize);
- popstack(stack);
- }
- break;
-
case OP_SIZE:
{
// (in -- in size)
if (stack.size() < 1)
return false;
- CBigNum bn(stacktop(-1).size());
+ CBigNum bn((uint16_t) 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 (unsigned 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 (unsigned int i = 0; i < vch1.size(); i++)
- vch1[i] &= vch2[i];
- }
- else if (opcode == OP_OR)
- {
- for (unsigned int i = 0; i < vch1.size(); i++)
- vch1[i] |= vch2[i];
- }
- else if (opcode == OP_XOR)
- {
- for (unsigned int i = 0; i < vch1.size(); i++)
- vch1[i] ^= vch2[i];
- }
- popstack(stack);
- }
- break;
-
case OP_EQUAL:
case OP_EQUALVERIFY:
//case OP_NOTEQUAL: // use OP_NUMNOTEQUAL
//
case OP_1ADD:
case OP_1SUB:
- case OP_2MUL:
- case OP_2DIV:
case OP_NEGATE:
case OP_ABS:
case OP_NOT:
{
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_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:
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 || bn2 > CBigNum(2048))
- return false;
- bn = bn1 << bn2.getulong();
- break;
-
- case OP_RSHIFT:
- if (bn2 < bnZero || bn2 > CBigNum(2048))
- 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;
// 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);
+ bool fSuccess = IsCanonicalSignature(vchSig, flags) && IsCanonicalPubKey(vchPubKey, flags) &&
+ CheckSig(vchSig, vchPubKey, scriptCode, txTo, nIn, nHashType, flags);
popstack(stack);
popstack(stack);
// ([sig ...] num_of_signatures [pubkey ...] num_of_pubkeys -- bool)
int i = 1;
- if (stack.size() < i)
+ if ((int)stack.size() < i)
return false;
- int nKeysCount = CastToBigNum(stacktop(-i)).getint();
+ int nKeysCount = CastToBigNum(stacktop(-i)).getint32();
if (nKeysCount < 0 || nKeysCount > 20)
return false;
nOpCount += nKeysCount;
return false;
int ikey = ++i;
i += nKeysCount;
- if (stack.size() < i)
+ if ((int)stack.size() < i)
return false;
- int nSigsCount = CastToBigNum(stacktop(-i)).getint();
+ int nSigsCount = CastToBigNum(stacktop(-i)).getint32();
if (nSigsCount < 0 || nSigsCount > nKeysCount)
return false;
int isig = ++i;
i += nSigsCount;
- if (stack.size() < i)
+ if ((int)stack.size() < i)
return false;
// Subset of script starting at the most recent codeseparator
valtype& vchPubKey = stacktop(-ikey);
// Check signature
- if (CheckSig(vchSig, vchPubKey, scriptCode, txTo, nIn, nHashType))
- {
+ bool fOk = IsCanonicalSignature(vchSig, flags) && IsCanonicalPubKey(vchPubKey, flags) &&
+ CheckSig(vchSig, vchPubKey, scriptCode, txTo, nIn, nHashType, flags);
+
+ if (fOk) {
isig++;
nSigsCount--;
}
fSuccess = false;
}
- while (i-- > 0)
+ while (i-- > 1)
popstack(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.size() < 1)
+ return false;
+ if ((flags & SCRIPT_VERIFY_NULLDUMMY) && stacktop(-1).size())
+ return error("CHECKMULTISIG dummy argument not null");
+ popstack(stack);
+
stack.push_back(fSuccess ? vchTrue : vchFalse);
if (opcode == OP_CHECKMULTISIGVERIFY)
}
else if ((nHashType & 0x1f) == SIGHASH_SINGLE)
{
- // Only lockin the txout payee at same index as txin
+ // Only lock-in the txout payee at same index as txin
unsigned int nOut = nIn;
if (nOut >= txTmp.vout.size())
{
{
private:
// sigdata_type is (signature hash, signature, public key):
- typedef boost::tuple<uint256, std::vector<unsigned char>, std::vector<unsigned char> > sigdata_type;
+ typedef boost::tuple<uint256, std::vector<unsigned char>, CPubKey > sigdata_type;
std::set< sigdata_type> setValid;
- CCriticalSection cs_sigcache;
+ boost::shared_mutex cs_sigcache;
public:
bool
- Get(uint256 hash, const std::vector<unsigned char>& vchSig, const std::vector<unsigned char>& pubKey)
+ Get(const uint256 &hash, const std::vector<unsigned char>& vchSig, const CPubKey& pubKey)
{
- LOCK(cs_sigcache);
+ boost::shared_lock<boost::shared_mutex> lock(cs_sigcache);
sigdata_type k(hash, vchSig, pubKey);
std::set<sigdata_type>::iterator mi = setValid.find(k);
return false;
}
- void
- Set(uint256 hash, const std::vector<unsigned char>& vchSig, const std::vector<unsigned char>& pubKey)
+ void Set(const uint256 &hash, const std::vector<unsigned char>& vchSig, const CPubKey& pubKey)
{
// DoS prevention: limit cache size to less than 10MB
// (~200 bytes per cache entry times 50,000 entries)
// Since there are a maximum of 20,000 signature operations per block
// 50,000 is a reasonable default.
- int64 nMaxCacheSize = GetArg("-maxsigcachesize", 50000);
+ int64_t nMaxCacheSize = GetArg("-maxsigcachesize", 50000);
if (nMaxCacheSize <= 0) return;
- LOCK(cs_sigcache);
+ boost::shared_lock<boost::shared_mutex> lock(cs_sigcache);
- while (static_cast<int64>(setValid.size()) > nMaxCacheSize)
+ while (static_cast<int64_t>(setValid.size()) > nMaxCacheSize)
{
// Evict a random entry. Random because that helps
// foil would-be DoS attackers who might try to pre-generate
}
};
-bool CheckSig(vector<unsigned char> vchSig, vector<unsigned char> vchPubKey, CScript scriptCode,
- const CTransaction& txTo, unsigned int nIn, int nHashType)
+bool CheckSig(vector<unsigned char> vchSig, const vector<unsigned char> &vchPubKey, const CScript &scriptCode,
+ const CTransaction& txTo, unsigned int nIn, int nHashType, int flags)
{
static CSignatureCache signatureCache;
+ CKey key;
+ if (!key.SetPubKey(vchPubKey))
+ return false;
+ CPubKey pubkey = key.GetPubKey();
+ if (!pubkey.IsValid())
+ return false;
+
// Hash type is one byte tacked on to the end of the signature
if (vchSig.empty())
return false;
uint256 sighash = SignatureHash(scriptCode, txTo, nIn, nHashType);
- if (signatureCache.Get(sighash, vchSig, vchPubKey))
+ if (signatureCache.Get(sighash, vchSig, pubkey))
return true;
- CKey key;
- if (!key.SetPubKey(vchPubKey))
- return false;
-
if (!key.Verify(sighash, vchSig))
return false;
- signatureCache.Set(sighash, vchSig, vchPubKey);
+ if (!(flags & SCRIPT_VERIFY_NOCACHE))
+ signatureCache.Set(sighash, vchSig, pubkey);
+
return true;
}
-
//
// Return public keys or hashes from scriptPubKey, for 'standard' transaction types.
//
// Sender provides N pubkeys, receivers provides M signatures
mTemplates.insert(make_pair(TX_MULTISIG, CScript() << OP_SMALLINTEGER << OP_PUBKEYS << OP_SMALLINTEGER << OP_CHECKMULTISIG));
+
+ // Empty, provably prunable, data-carrying output
+ mTemplates.insert(make_pair(TX_NULL_DATA, CScript() << OP_RETURN << OP_SMALLDATA));
}
// Shortcut for pay-to-script-hash, which are more constrained than the other types:
// Compare
CScript::const_iterator pc1 = script1.begin();
CScript::const_iterator pc2 = script2.begin();
- loop
+ while (true)
{
if (pc1 == script1.end() && pc2 == script2.end())
{
if (!script2.GetOp(pc2, opcode2, vch2))
break;
// Normal situation is to fall through
- // to other if/else statments
+ // to other if/else statements
}
if (opcode2 == OP_PUBKEY)
else
break;
}
+ else if (opcode2 == OP_SMALLDATA)
+ {
+ // small pushdata, <= 80 bytes
+ if (vch1.size() > 80)
+ break;
+ }
else if (opcode1 != opcode2 || vch1 != vch2)
{
// Others must match exactly
}
-bool Sign1(const CBitcoinAddress& address, const CKeyStore& keystore, uint256 hash, int nHashType, CScript& scriptSigRet)
+bool Sign1(const CKeyID& address, const CKeyStore& keystore, uint256 hash, int nHashType, CScript& scriptSigRet)
{
CKey key;
if (!keystore.GetKey(address, key))
{
int nSigned = 0;
int nRequired = multisigdata.front()[0];
- for (vector<valtype>::const_iterator it = multisigdata.begin()+1; it != multisigdata.begin()+multisigdata.size()-1; it++)
+ for (unsigned int i = 1; i < multisigdata.size()-1 && nSigned < nRequired; i++)
{
- const valtype& pubkey = *it;
- CBitcoinAddress address;
- address.SetPubKey(pubkey);
- if (Sign1(address, keystore, hash, nHashType, scriptSigRet))
- {
+ const valtype& pubkey = multisigdata[i];
+ CKeyID keyID = CPubKey(pubkey).GetID();
+ if (Sign1(keyID, keystore, hash, nHashType, scriptSigRet))
++nSigned;
- if (nSigned == nRequired) break;
- }
}
return nSigned==nRequired;
}
// Sign scriptPubKey with private keys stored in keystore, given transaction hash and hash type.
// Signatures are returned in scriptSigRet (or returns false if scriptPubKey can't be signed),
// unless whichTypeRet is TX_SCRIPTHASH, in which case scriptSigRet is the redemption script.
-// Returns false if scriptPubKey could not be completely satisified.
+// Returns false if scriptPubKey could not be completely satisfied.
//
bool Solver(const CKeyStore& keystore, const CScript& scriptPubKey, uint256 hash, int nHashType,
CScript& scriptSigRet, txnouttype& whichTypeRet)
if (!Solver(scriptPubKey, whichTypeRet, vSolutions))
return false;
- CBitcoinAddress address;
+ CKeyID keyID;
switch (whichTypeRet)
{
case TX_NONSTANDARD:
+ case TX_NULL_DATA:
return false;
case TX_PUBKEY:
- address.SetPubKey(vSolutions[0]);
- return Sign1(address, keystore, hash, nHashType, scriptSigRet);
+ keyID = CPubKey(vSolutions[0]).GetID();
+ return Sign1(keyID, keystore, hash, nHashType, scriptSigRet);
case TX_PUBKEYHASH:
- address.SetHash160(uint160(vSolutions[0]));
- if (!Sign1(address, keystore, hash, nHashType, scriptSigRet))
+ keyID = CKeyID(uint160(vSolutions[0]));
+ if (!Sign1(keyID, keystore, hash, nHashType, scriptSigRet))
return false;
else
{
- valtype vch;
- keystore.GetPubKey(address, vch);
+ CPubKey vch;
+ keystore.GetPubKey(keyID, vch);
scriptSigRet << vch;
}
return true;
{
case TX_NONSTANDARD:
return -1;
+ case TX_NULL_DATA:
+ return 1;
case TX_PUBKEY:
return 1;
case TX_PUBKEYHASH:
return -1;
}
-bool IsStandard(const CScript& scriptPubKey)
+bool IsStandard(const CScript& scriptPubKey, txnouttype& whichType)
{
vector<valtype> vSolutions;
- txnouttype whichType;
if (!Solver(scriptPubKey, whichType, vSolutions))
return false;
unsigned int nResult = 0;
BOOST_FOREACH(const valtype& pubkey, pubkeys)
{
- CBitcoinAddress address;
- address.SetPubKey(pubkey);
- if (keystore.HaveKey(address))
+ CKeyID keyID = CPubKey(pubkey).GetID();
+ if (keystore.HaveKey(keyID))
++nResult;
}
return nResult;
}
-bool IsMine(const CKeyStore &keystore, const CScript& scriptPubKey)
+
+class CKeyStoreIsMineVisitor : public boost::static_visitor<bool>
+{
+private:
+ const CKeyStore *keystore;
+public:
+ CKeyStoreIsMineVisitor(const CKeyStore *keystoreIn) : keystore(keystoreIn) { }
+ bool operator()(const CNoDestination &dest) const { return false; }
+ bool operator()(const CKeyID &keyID) const { return keystore->HaveKey(keyID); }
+ bool operator()(const CScriptID &scriptID) const { return keystore->HaveCScript(scriptID); }
+};
+
+isminetype IsMine(const CKeyStore &keystore, const CTxDestination& dest)
+{
+ CScript script;
+ script.SetDestination(dest);
+ return IsMine(keystore, script);
+}
+
+isminetype IsMine(const CKeyStore &keystore, const CScript& scriptPubKey)
{
vector<valtype> vSolutions;
txnouttype whichType;
- if (!Solver(scriptPubKey, whichType, vSolutions))
- return false;
+ if (!Solver(scriptPubKey, whichType, vSolutions)) {
+ if (keystore.HaveWatchOnly(scriptPubKey))
+ return MINE_WATCH_ONLY;
+ return MINE_NO;
+ }
- CBitcoinAddress address;
+ CKeyID keyID;
switch (whichType)
{
case TX_NONSTANDARD:
- return false;
+ case TX_NULL_DATA:
+ break;
case TX_PUBKEY:
- address.SetPubKey(vSolutions[0]);
- return keystore.HaveKey(address);
+ keyID = CPubKey(vSolutions[0]).GetID();
+ if (keystore.HaveKey(keyID))
+ return MINE_SPENDABLE;
+ break;
case TX_PUBKEYHASH:
- address.SetHash160(uint160(vSolutions[0]));
- return keystore.HaveKey(address);
+ keyID = CKeyID(uint160(vSolutions[0]));
+ if (keystore.HaveKey(keyID))
+ return MINE_SPENDABLE;
+ break;
case TX_SCRIPTHASH:
{
+ CScriptID scriptID = CScriptID(uint160(vSolutions[0]));
CScript subscript;
- if (!keystore.GetCScript(uint160(vSolutions[0]), subscript))
- return false;
- return IsMine(keystore, subscript);
+ if (keystore.GetCScript(scriptID, subscript)) {
+ isminetype ret = IsMine(keystore, subscript);
+ if (ret == MINE_SPENDABLE)
+ return ret;
+ }
+ break;
}
case TX_MULTISIG:
{
// them) enable spend-out-from-under-you attacks, especially
// in shared-wallet situations.
vector<valtype> keys(vSolutions.begin()+1, vSolutions.begin()+vSolutions.size()-1);
- return HaveKeys(keys, keystore) == keys.size();
+ if (HaveKeys(keys, keystore) == keys.size())
+ return MINE_SPENDABLE;
+ break;
}
}
- return false;
+
+ if (keystore.HaveWatchOnly(scriptPubKey))
+ return MINE_WATCH_ONLY;
+ return MINE_NO;
}
-bool ExtractAddress(const CScript& scriptPubKey, CBitcoinAddress& addressRet)
+bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet)
{
vector<valtype> vSolutions;
txnouttype whichType;
if (whichType == TX_PUBKEY)
{
- addressRet.SetPubKey(vSolutions[0]);
+ addressRet = CPubKey(vSolutions[0]).GetID();
return true;
}
else if (whichType == TX_PUBKEYHASH)
{
- addressRet.SetHash160(uint160(vSolutions[0]));
+ addressRet = CKeyID(uint160(vSolutions[0]));
return true;
}
else if (whichType == TX_SCRIPTHASH)
{
- addressRet.SetScriptHash160(uint160(vSolutions[0]));
+ addressRet = CScriptID(uint160(vSolutions[0]));
return true;
}
// Multisig txns have more than one address...
return false;
}
-bool ExtractAddresses(const CScript& scriptPubKey, txnouttype& typeRet, vector<CBitcoinAddress>& addressRet, int& nRequiredRet)
+class CAffectedKeysVisitor : public boost::static_visitor<void> {
+private:
+ const CKeyStore &keystore;
+ std::vector<CKeyID> &vKeys;
+
+public:
+ CAffectedKeysVisitor(const CKeyStore &keystoreIn, std::vector<CKeyID> &vKeysIn) : keystore(keystoreIn), vKeys(vKeysIn) {}
+
+ void Process(const CScript &script) {
+ txnouttype type;
+ std::vector<CTxDestination> vDest;
+ int nRequired;
+ if (ExtractDestinations(script, type, vDest, nRequired)) {
+ BOOST_FOREACH(const CTxDestination &dest, vDest)
+ boost::apply_visitor(*this, dest);
+ }
+ }
+
+ void operator()(const CKeyID &keyId) {
+ if (keystore.HaveKey(keyId))
+ vKeys.push_back(keyId);
+ }
+
+ void operator()(const CScriptID &scriptId) {
+ CScript script;
+ if (keystore.GetCScript(scriptId, script))
+ Process(script);
+ }
+
+ void operator()(const CNoDestination &none) {}
+};
+
+
+void ExtractAffectedKeys(const CKeyStore &keystore, const CScript& scriptPubKey, std::vector<CKeyID> &vKeys) {
+ CAffectedKeysVisitor(keystore, vKeys).Process(scriptPubKey);
+}
+
+bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, vector<CTxDestination>& addressRet, int& nRequiredRet)
{
addressRet.clear();
typeRet = TX_NONSTANDARD;
vector<valtype> vSolutions;
if (!Solver(scriptPubKey, typeRet, vSolutions))
return false;
+ if (typeRet == TX_NULL_DATA)
+ return true;
if (typeRet == TX_MULTISIG)
{
nRequiredRet = vSolutions.front()[0];
for (unsigned int i = 1; i < vSolutions.size()-1; i++)
{
- CBitcoinAddress address;
- address.SetPubKey(vSolutions[i]);
+ CTxDestination address = CPubKey(vSolutions[i]).GetID();
addressRet.push_back(address);
}
}
else
{
nRequiredRet = 1;
- CBitcoinAddress address;
- if (typeRet == TX_PUBKEYHASH)
- address.SetHash160(uint160(vSolutions.front()));
- else if (typeRet == TX_SCRIPTHASH)
- address.SetScriptHash160(uint160(vSolutions.front()));
- else if (typeRet == TX_PUBKEY)
- address.SetPubKey(vSolutions.front());
+ CTxDestination address;
+ if (!ExtractDestination(scriptPubKey, address))
+ return false;
addressRet.push_back(address);
}
}
bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn,
- bool fValidatePayToScriptHash, int nHashType)
+ unsigned int flags, int nHashType)
{
vector<vector<unsigned char> > stack, stackCopy;
- if (!EvalScript(stack, scriptSig, txTo, nIn, nHashType))
+ if (!EvalScript(stack, scriptSig, txTo, nIn, flags, nHashType))
return false;
- if (fValidatePayToScriptHash)
+ if (flags & SCRIPT_VERIFY_P2SH)
stackCopy = stack;
- if (!EvalScript(stack, scriptPubKey, txTo, nIn, nHashType))
+ if (!EvalScript(stack, scriptPubKey, txTo, nIn, flags, nHashType))
return false;
if (stack.empty())
return false;
return false;
// Additional validation for spend-to-script-hash transactions:
- if (fValidatePayToScriptHash && scriptPubKey.IsPayToScriptHash())
+ if ((flags & SCRIPT_VERIFY_P2SH) && scriptPubKey.IsPayToScriptHash())
{
if (!scriptSig.IsPushOnly()) // scriptSig must be literals-only
return false; // or validation fails
+ // 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.
+ assert(!stackCopy.empty());
+
const valtype& pubKeySerialized = stackCopy.back();
CScript pubKey2(pubKeySerialized.begin(), pubKeySerialized.end());
popstack(stackCopy);
- if (!EvalScript(stackCopy, pubKey2, txTo, nIn, nHashType))
+ if (!EvalScript(stackCopy, pubKey2, txTo, nIn, flags, nHashType))
return false;
if (stackCopy.empty())
return false;
return true;
}
-
-bool SignSignature(const CKeyStore &keystore, const CTransaction& txFrom, CTransaction& txTo, unsigned int nIn, int nHashType)
+bool SignSignature(const CKeyStore &keystore, const CScript& fromPubKey, CTransaction& txTo, unsigned int nIn, int nHashType)
{
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(txout.scriptPubKey, txTo, nIn, nHashType);
+ uint256 hash = SignatureHash(fromPubKey, txTo, nIn, nHashType);
txnouttype whichType;
- if (!Solver(keystore, txout.scriptPubKey, hash, nHashType, txin.scriptSig, whichType))
+ if (!Solver(keystore, fromPubKey, hash, nHashType, txin.scriptSig, whichType))
return false;
if (whichType == TX_SCRIPTHASH)
// Recompute txn hash using subscript in place of scriptPubKey:
uint256 hash2 = SignatureHash(subscript, txTo, nIn, nHashType);
+
txnouttype subType;
- if (!Solver(keystore, subscript, hash2, nHashType, txin.scriptSig, subType))
- return false;
- if (subType == TX_SCRIPTHASH)
- return false;
- txin.scriptSig << static_cast<valtype>(subscript); // Append serialized subscript
+ bool fSolved =
+ Solver(keystore, subscript, hash2, nHashType, txin.scriptSig, subType) && subType != TX_SCRIPTHASH;
+ // Append serialized subscript whether or not it is completely signed:
+ txin.scriptSig << static_cast<valtype>(subscript);
+ if (!fSolved) return false;
}
// Test solution
- if (!VerifyScript(txin.scriptSig, txout.scriptPubKey, txTo, nIn, true, 0))
- return false;
-
- return true;
+ return VerifyScript(txin.scriptSig, fromPubKey, txTo, nIn, STRICT_FLAGS, 0);
}
-
-bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsigned int nIn, bool fValidatePayToScriptHash, int nHashType)
+bool SignSignature(const CKeyStore &keystore, const CTransaction& txFrom, 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;
+ CTxIn& txin = txTo.vin[nIn];
+ assert(txin.prevout.n < txFrom.vout.size());
+ assert(txin.prevout.hash == txFrom.GetHash());
const CTxOut& txout = txFrom.vout[txin.prevout.n];
- if (txin.prevout.hash != txFrom.GetHash())
- return false;
+ return SignSignature(keystore, txout.scriptPubKey, txTo, nIn, nHashType);
+}
- if (!VerifyScript(txin.scriptSig, txout.scriptPubKey, txTo, nIn, fValidatePayToScriptHash, nHashType))
- return false;
+static CScript PushAll(const vector<valtype>& values)
+{
+ CScript result;
+ BOOST_FOREACH(const valtype& v, values)
+ result << v;
+ return result;
+}
- return true;
+static CScript CombineMultisig(CScript scriptPubKey, const CTransaction& txTo, unsigned int nIn,
+ const vector<valtype>& vSolutions,
+ vector<valtype>& sigs1, vector<valtype>& sigs2)
+{
+ // Combine all the signatures we've got:
+ set<valtype> allsigs;
+ BOOST_FOREACH(const valtype& v, sigs1)
+ {
+ if (!v.empty())
+ allsigs.insert(v);
+ }
+ BOOST_FOREACH(const valtype& v, sigs2)
+ {
+ if (!v.empty())
+ allsigs.insert(v);
+ }
+
+ // Build a map of pubkey -> signature by matching sigs to pubkeys:
+ assert(vSolutions.size() > 1);
+ unsigned int nSigsRequired = vSolutions.front()[0];
+ unsigned int nPubKeys = vSolutions.size()-2;
+ map<valtype, valtype> sigs;
+ BOOST_FOREACH(const valtype& sig, allsigs)
+ {
+ for (unsigned int i = 0; i < nPubKeys; i++)
+ {
+ const valtype& pubkey = vSolutions[i+1];
+ if (sigs.count(pubkey))
+ continue; // Already got a sig for this pubkey
+
+ if (CheckSig(sig, pubkey, scriptPubKey, txTo, nIn, 0, 0))
+ {
+ sigs[pubkey] = sig;
+ break;
+ }
+ }
+ }
+ // Now build a merged CScript:
+ unsigned int nSigsHave = 0;
+ CScript result; result << OP_0; // pop-one-too-many workaround
+ for (unsigned int i = 0; i < nPubKeys && nSigsHave < nSigsRequired; i++)
+ {
+ if (sigs.count(vSolutions[i+1]))
+ {
+ result << sigs[vSolutions[i+1]];
+ ++nSigsHave;
+ }
+ }
+ // Fill any missing with OP_0:
+ for (unsigned int i = nSigsHave; i < nSigsRequired; i++)
+ result << OP_0;
+
+ return result;
+}
+
+static CScript CombineSignatures(CScript scriptPubKey, const CTransaction& txTo, unsigned int nIn,
+ const txnouttype txType, const vector<valtype>& vSolutions,
+ vector<valtype>& sigs1, vector<valtype>& sigs2)
+{
+ switch (txType)
+ {
+ case TX_NONSTANDARD:
+ case TX_NULL_DATA:
+ // Don't know anything about this, assume bigger one is correct:
+ if (sigs1.size() >= sigs2.size())
+ return PushAll(sigs1);
+ return PushAll(sigs2);
+ case TX_PUBKEY:
+ case TX_PUBKEYHASH:
+ // Signatures are bigger than placeholders or empty scripts:
+ if (sigs1.empty() || sigs1[0].empty())
+ return PushAll(sigs2);
+ return PushAll(sigs1);
+ case TX_SCRIPTHASH:
+ if (sigs1.empty() || sigs1.back().empty())
+ return PushAll(sigs2);
+ else if (sigs2.empty() || sigs2.back().empty())
+ return PushAll(sigs1);
+ else
+ {
+ // Recur to combine:
+ valtype spk = sigs1.back();
+ CScript pubKey2(spk.begin(), spk.end());
+
+ txnouttype txType2;
+ vector<vector<unsigned char> > vSolutions2;
+ Solver(pubKey2, txType2, vSolutions2);
+ sigs1.pop_back();
+ sigs2.pop_back();
+ CScript result = CombineSignatures(pubKey2, txTo, nIn, txType2, vSolutions2, sigs1, sigs2);
+ result << spk;
+ return result;
+ }
+ case TX_MULTISIG:
+ return CombineMultisig(scriptPubKey, txTo, nIn, vSolutions, sigs1, sigs2);
+ }
+
+ return CScript();
+}
+
+CScript CombineSignatures(CScript scriptPubKey, const CTransaction& txTo, unsigned int nIn,
+ const CScript& scriptSig1, const CScript& scriptSig2)
+{
+ txnouttype txType;
+ vector<vector<unsigned char> > vSolutions;
+ Solver(scriptPubKey, txType, vSolutions);
+
+ vector<valtype> stack1;
+ EvalScript(stack1, scriptSig1, CTransaction(), 0, SCRIPT_VERIFY_STRICTENC, 0);
+ vector<valtype> stack2;
+ EvalScript(stack2, scriptSig2, CTransaction(), 0, SCRIPT_VERIFY_STRICTENC, 0);
+
+ return CombineSignatures(scriptPubKey, txTo, nIn, txType, vSolutions, stack1, stack2);
}
unsigned int CScript::GetSigOpCount(bool fAccurate) const
return 0;
}
- /// ... and return it's opcount:
+ /// ... and return its opcount:
CScript subscript(data.begin(), data.end());
return subscript.GetSigOpCount(true);
}
this->at(22) == OP_EQUAL);
}
-void CScript::SetBitcoinAddress(const CBitcoinAddress& address)
+bool CScript::HasCanonicalPushes() const
{
- this->clear();
- if (address.IsScript())
- *this << OP_HASH160 << address.GetHash160() << OP_EQUAL;
- else
- *this << OP_DUP << OP_HASH160 << address.GetHash160() << OP_EQUALVERIFY << OP_CHECKSIG;
+ const_iterator pc = begin();
+ while (pc < end())
+ {
+ opcodetype opcode;
+ std::vector<unsigned char> data;
+ if (!GetOp(pc, opcode, data))
+ return false;
+ if (opcode > OP_16)
+ continue;
+ if (opcode < OP_PUSHDATA1 && opcode > OP_0 && (data.size() == 1 && data[0] <= 16))
+ // Could have used an OP_n code, rather than a 1-byte push.
+ return false;
+ if (opcode == OP_PUSHDATA1 && data.size() < OP_PUSHDATA1)
+ // Could have used a normal n-byte push, rather than OP_PUSHDATA1.
+ return false;
+ if (opcode == OP_PUSHDATA2 && data.size() <= 0xFF)
+ // Could have used an OP_PUSHDATA1.
+ return false;
+ if (opcode == OP_PUSHDATA4 && data.size() <= 0xFFFF)
+ // Could have used an OP_PUSHDATA2.
+ return false;
+ }
+ return true;
+}
+
+class CScriptVisitor : public boost::static_visitor<bool>
+{
+private:
+ CScript *script;
+public:
+ CScriptVisitor(CScript *scriptin) { script = scriptin; }
+
+ bool operator()(const CNoDestination &dest) const {
+ script->clear();
+ return false;
+ }
+
+ bool operator()(const CKeyID &keyID) const {
+ script->clear();
+ *script << OP_DUP << OP_HASH160 << keyID << OP_EQUALVERIFY << OP_CHECKSIG;
+ return true;
+ }
+
+ bool operator()(const CScriptID &scriptID) const {
+ script->clear();
+ *script << OP_HASH160 << scriptID << OP_EQUAL;
+ return true;
+ }
+};
+
+void CScript::SetDestination(const CTxDestination& dest)
+{
+ boost::apply_visitor(CScriptVisitor(this), dest);
}
void CScript::SetMultisig(int nRequired, const std::vector<CKey>& keys)
*this << key.GetPubKey();
*this << EncodeOP_N(keys.size()) << OP_CHECKMULTISIG;
}
-
-void CScript::SetPayToScriptHash(const CScript& subscript)
-{
- assert(!subscript.empty());
- uint160 subscriptHash = Hash160(subscript);
- this->clear();
- *this << OP_HASH160 << subscriptHash << OP_EQUAL;
-}