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Merge #12939: Extract consts for WITNESS_V0 hash sizes

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3450a9b Extract consts for WITNESS_V0 hash sizes (Ben Woosley)

Pull request description:

Tree-SHA512: 57ba84dfa36aa61cabffce747388143cf1c8724dd2fc42aecf93748158b75dbe278b21a32483a100b8c303f6ad01d048da03b0a5c172175febbe70938ed4339d
This commit is contained in:
Wladimir J. van der Laan 2018-04-12 08:16:53 +02:00
commit e561cf4fa8
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GPG Key ID: 1E4AED62986CD25D
4 changed files with 11 additions and 7 deletions
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2
src/policy/policy.cpp
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@ -230,7 +230,7 @@ bool IsWitnessStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs)
return false; return false;
// Check P2WSH standard limits // Check P2WSH standard limits
if (witnessversion == 0 && witnessprogram.size() == 32) { if (witnessversion == 0 && witnessprogram.size() == WITNESS_V0_SCRIPTHASH_SIZE) {
if (tx.vin[i].scriptWitness.stack.back().size() > MAX_STANDARD_P2WSH_SCRIPT_SIZE) if (tx.vin[i].scriptWitness.stack.back().size() > MAX_STANDARD_P2WSH_SCRIPT_SIZE)
return false; return false;
size_t sizeWitnessStack = tx.vin[i].scriptWitness.stack.size() - 1; size_t sizeWitnessStack = tx.vin[i].scriptWitness.stack.size() - 1;

8
src/script/interpreter.cpp
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@ -1361,7 +1361,7 @@ static bool VerifyWitnessProgram(const CScriptWitness& witness, int witversion,
CScript scriptPubKey; CScript scriptPubKey;
if (witversion == 0) { if (witversion == 0) {
if (program.size() == 32) { if (program.size() == WITNESS_V0_SCRIPTHASH_SIZE) {
// Version 0 segregated witness program: SHA256(CScript) inside the program, CScript + inputs in witness // Version 0 segregated witness program: SHA256(CScript) inside the program, CScript + inputs in witness
if (witness.stack.size() == 0) { if (witness.stack.size() == 0) {
return set_error(serror, SCRIPT_ERR_WITNESS_PROGRAM_WITNESS_EMPTY); return set_error(serror, SCRIPT_ERR_WITNESS_PROGRAM_WITNESS_EMPTY);
@ -1373,7 +1373,7 @@ static bool VerifyWitnessProgram(const CScriptWitness& witness, int witversion,
if (memcmp(hashScriptPubKey.begin(), program.data(), 32)) { if (memcmp(hashScriptPubKey.begin(), program.data(), 32)) {
return set_error(serror, SCRIPT_ERR_WITNESS_PROGRAM_MISMATCH); return set_error(serror, SCRIPT_ERR_WITNESS_PROGRAM_MISMATCH);
} }
} else if (program.size() == 20) { } else if (program.size() == WITNESS_V0_KEYHASH_SIZE) {
// Special case for pay-to-pubkeyhash; signature + pubkey in witness // Special case for pay-to-pubkeyhash; signature + pubkey in witness
if (witness.stack.size() != 2) { if (witness.stack.size() != 2) {
return set_error(serror, SCRIPT_ERR_WITNESS_PROGRAM_MISMATCH); // 2 items in witness return set_error(serror, SCRIPT_ERR_WITNESS_PROGRAM_MISMATCH); // 2 items in witness
@ -1530,10 +1530,10 @@ bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const C
size_t static WitnessSigOps(int witversion, const std::vector<unsigned char>& witprogram, const CScriptWitness& witness, int flags) size_t static WitnessSigOps(int witversion, const std::vector<unsigned char>& witprogram, const CScriptWitness& witness, int flags)
{ {
if (witversion == 0) { if (witversion == 0) {
if (witprogram.size() == 20) if (witprogram.size() == WITNESS_V0_KEYHASH_SIZE)
return 1; return 1;
if (witprogram.size() == 32 && witness.stack.size() > 0) { if (witprogram.size() == WITNESS_V0_SCRIPTHASH_SIZE && witness.stack.size() > 0) {
CScript subscript(witness.stack.back().begin(), witness.stack.back().end()); CScript subscript(witness.stack.back().begin(), witness.stack.back().end());
return subscript.GetSigOpCount(true); return subscript.GetSigOpCount(true);
} }

4
src/script/interpreter.h
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@ -129,6 +129,10 @@ enum class SigVersion
WITNESS_V0 = 1, WITNESS_V0 = 1,
}; };
/** Signature hash sizes */
static constexpr size_t WITNESS_V0_SCRIPTHASH_SIZE = 32;
static constexpr size_t WITNESS_V0_KEYHASH_SIZE = 20;
uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, const CAmount& amount, SigVersion sigversion, const PrecomputedTransactionData* cache = nullptr); uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, const CAmount& amount, SigVersion sigversion, const PrecomputedTransactionData* cache = nullptr);
class BaseSignatureChecker class BaseSignatureChecker

4
src/script/standard.cpp
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@ -66,12 +66,12 @@ bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<std::v
int witnessversion; int witnessversion;
std::vector<unsigned char> witnessprogram; std::vector<unsigned char> witnessprogram;
if (scriptPubKey.IsWitnessProgram(witnessversion, witnessprogram)) { if (scriptPubKey.IsWitnessProgram(witnessversion, witnessprogram)) {
if (witnessversion == 0 && witnessprogram.size() == 20) { if (witnessversion == 0 && witnessprogram.size() == WITNESS_V0_KEYHASH_SIZE) {
typeRet = TX_WITNESS_V0_KEYHASH; typeRet = TX_WITNESS_V0_KEYHASH;
vSolutionsRet.push_back(witnessprogram); vSolutionsRet.push_back(witnessprogram);
return true; return true;
} }
if (witnessversion == 0 && witnessprogram.size() == 32) { if (witnessversion == 0 && witnessprogram.size() == WITNESS_V0_SCRIPTHASH_SIZE) {
typeRet = TX_WITNESS_V0_SCRIPTHASH; typeRet = TX_WITNESS_V0_SCRIPTHASH;
vSolutionsRet.push_back(witnessprogram); vSolutionsRet.push_back(witnessprogram);
return true; return true;