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partial merge bitcoin#11403: Abstract out IsSolvable from Witnessifier

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This commit is contained in:
Pieter Wuille 2017-11-30 16:48:31 -08:00 committed by UdjinM6
parent c8ee5e1665
commit 01fccc4694
No known key found for this signature in database
GPG Key ID: 83592BD1400D58D9
3 changed files with 37 additions and 16 deletions
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6
src/policy/policy.h
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@ -43,7 +43,7 @@ static const unsigned int DUST_RELAY_TX_FEE = 3000;
* with. However scripts violating these flags may still be present in valid
* blocks and we must accept those blocks.
*/
static const unsigned int STANDARD_SCRIPT_VERIFY_FLAGS = MANDATORY_SCRIPT_VERIFY_FLAGS |
static constexpr unsigned int STANDARD_SCRIPT_VERIFY_FLAGS = MANDATORY_SCRIPT_VERIFY_FLAGS |
SCRIPT_VERIFY_DERSIG |
SCRIPT_VERIFY_STRICTENC |
SCRIPT_VERIFY_MINIMALDATA |
@ -58,10 +58,10 @@ static const unsigned int STANDARD_SCRIPT_VERIFY_FLAGS = MANDATORY_SCRIPT_VERIFY
SCRIPT_VERIFY_CONST_SCRIPTCODE;
/** For convenience, standard but not mandatory verify flags. */
static const unsigned int STANDARD_NOT_MANDATORY_VERIFY_FLAGS = STANDARD_SCRIPT_VERIFY_FLAGS & ~MANDATORY_SCRIPT_VERIFY_FLAGS;
static constexpr unsigned int STANDARD_NOT_MANDATORY_VERIFY_FLAGS = STANDARD_SCRIPT_VERIFY_FLAGS & ~MANDATORY_SCRIPT_VERIFY_FLAGS;
/** Used as the flags parameter to sequence and nLocktime checks in non-consensus code. */
static const unsigned int STANDARD_LOCKTIME_VERIFY_FLAGS = LOCKTIME_VERIFY_SEQUENCE |
static constexpr unsigned int STANDARD_LOCKTIME_VERIFY_FLAGS = LOCKTIME_VERIFY_SEQUENCE |
LOCKTIME_MEDIAN_TIME_PAST;
CAmount GetDustThreshold(const CTxOut& txout, const CFeeRate& dustRelayFee);

15
src/script/sign.cpp
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@ -352,3 +352,18 @@ public:
}
const BaseSignatureCreator& DUMMY_SIGNATURE_CREATOR = DummySignatureCreator();
bool IsSolvable(const CKeyStore& store, const CScript& script)
{
// This check is to make sure that the script we created can actually be solved for and signed by us
// if we were to have the private keys. This is just to make sure that the script is valid and that,
// if found in a transaction, we would still accept and relay that transaction.
DummySignatureCreator creator(&store);
SignatureData sigs;
if (ProduceSignature(creator, script, sigs)) {
// VerifyScript check is just defensive, and should never fail.
assert(VerifyScript(sigs.scriptSig, script, STANDARD_SCRIPT_VERIFY_FLAGS, creator.Checker()));
return true;
}
return false;
}

6
src/script/sign.h
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@ -82,4 +82,10 @@ SignatureData DataFromTransaction(const CMutableTransaction& tx, unsigned int nI
void UpdateTransaction(CMutableTransaction& tx, unsigned int nIn, const SignatureData& data);
void UpdateInput(CTxIn& input, const SignatureData& data);
/* Check whether we know how to sign for an output like this, assuming we
* have all private keys. While this function does not need private keys, the passed
* keystore is used to look up public keys and redeemscripts by hash.
* Solvability is unrelated to whether we consider this output to be ours. */
bool IsSolvable(const CKeyStore& store, const CScript& script);
#endif // BITCOIN_SCRIPT_SIGN_H