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Refactor: SignSignature/VerifyScript

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Minor refactor to support signrawtx signing/verifying transactions
when it might only have the previous transaction's txid and
txOut.
This commit is contained in:
Gavin Andresen 2012-06-21 17:05:42 -04:00
parent 9a6ab7f142
commit 34420d655d
2 changed files with 17 additions and 13 deletions
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27
src/script.cpp
View File

@ -1590,19 +1590,17 @@ bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const C
} }
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()); assert(nIn < txTo.vin.size());
CTxIn& txin = txTo.vin[nIn]; 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. // 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. // 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; txnouttype whichType;
if (!Solver(keystore, txout.scriptPubKey, hash, nHashType, txin.scriptSig, whichType)) if (!Solver(keystore, fromPubKey, hash, nHashType, txin.scriptSig, whichType))
return false; return false;
if (whichType == TX_SCRIPTHASH) if (whichType == TX_SCRIPTHASH)
@ -1623,12 +1621,18 @@ bool SignSignature(const CKeyStore &keystore, const CTransaction& txFrom, CTrans
} }
// Test solution // Test solution
if (!VerifyScript(txin.scriptSig, txout.scriptPubKey, txTo, nIn, true, 0)) return VerifyScript(txin.scriptSig, fromPubKey, txTo, nIn, true, 0);
return false;
return true;
} }
bool SignSignature(const CKeyStore &keystore, const CTransaction& txFrom, 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];
return SignSignature(keystore, txout.scriptPubKey, txTo, nIn, nHashType);
}
bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsigned int nIn, bool fValidatePayToScriptHash, int nHashType) bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsigned int nIn, bool fValidatePayToScriptHash, int nHashType)
{ {
@ -1641,10 +1645,7 @@ bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsig
if (txin.prevout.hash != txFrom.GetHash()) if (txin.prevout.hash != txFrom.GetHash())
return false; return false;
if (!VerifyScript(txin.scriptSig, txout.scriptPubKey, txTo, nIn, fValidatePayToScriptHash, nHashType)) return VerifyScript(txin.scriptSig, txout.scriptPubKey, txTo, nIn, fValidatePayToScriptHash, nHashType);
return false;
return true;
} }
unsigned int CScript::GetSigOpCount(bool fAccurate) const unsigned int CScript::GetSigOpCount(bool fAccurate) const

3
src/script.h
View File

@ -591,7 +591,10 @@ bool IsMine(const CKeyStore& keystore, const CScript& scriptPubKey);
bool IsMine(const CKeyStore& keystore, const CTxDestination &dest); bool IsMine(const CKeyStore& keystore, const CTxDestination &dest);
bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet); bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet);
bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<CTxDestination>& addressRet, int& nRequiredRet); bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<CTxDestination>& addressRet, int& nRequiredRet);
bool SignSignature(const CKeyStore& keystore, const CScript& fromPubKey, CTransaction& txTo, unsigned int nIn, int nHashType=SIGHASH_ALL);
bool SignSignature(const CKeyStore& keystore, const CTransaction& txFrom, CTransaction& txTo, unsigned int nIn, int nHashType=SIGHASH_ALL); bool SignSignature(const CKeyStore& keystore, const CTransaction& txFrom, CTransaction& txTo, unsigned int nIn, int nHashType=SIGHASH_ALL);
bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn,
bool fValidatePayToScriptHash, int nHashType);
bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsigned int nIn, bool fValidatePayToScriptHash, int nHashType); bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsigned int nIn, bool fValidatePayToScriptHash, int nHashType);
#endif #endif