diff options
Diffstat (limited to 'src/policy/policy.h')
-rw-r--r-- | src/policy/policy.h | 49 |
1 files changed, 30 insertions, 19 deletions
diff --git a/src/policy/policy.h b/src/policy/policy.h index 8090dff4c6..f2a3f35546 100644 --- a/src/policy/policy.h +++ b/src/policy/policy.h @@ -1,5 +1,5 @@ // Copyright (c) 2009-2010 Satoshi Nakamoto -// Copyright (c) 2009-2019 The Bitcoin Core developers +// Copyright (c) 2009-2020 The Bitcoin Core developers // Distributed under the MIT software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. @@ -38,12 +38,14 @@ static const unsigned int DEFAULT_BYTES_PER_SIGOP = 20; static const bool DEFAULT_PERMIT_BAREMULTISIG = true; /** The maximum number of witness stack items in a standard P2WSH script */ static const unsigned int MAX_STANDARD_P2WSH_STACK_ITEMS = 100; -/** The maximum size of each witness stack item in a standard P2WSH script */ +/** The maximum size in bytes of each witness stack item in a standard P2WSH script */ static const unsigned int MAX_STANDARD_P2WSH_STACK_ITEM_SIZE = 80; -/** The maximum size of each witness stack item in a standard BIP 342 script (Taproot, leaf version 0xc0) */ +/** The maximum size in bytes of each witness stack item in a standard BIP 342 script (Taproot, leaf version 0xc0) */ static const unsigned int MAX_STANDARD_TAPSCRIPT_STACK_ITEM_SIZE = 80; -/** The maximum size of a standard witnessScript */ +/** The maximum size in bytes of a standard witnessScript */ static const unsigned int MAX_STANDARD_P2WSH_SCRIPT_SIZE = 3600; +/** The maximum size of a standard ScriptSig */ +static const unsigned int MAX_STANDARD_SCRIPTSIG_SIZE = 1650; /** Min feerate for defining dust. Historically this has been based on the * minRelayTxFee, however changing the dust limit changes which transactions are * standard and should be done with care and ideally rarely. It makes sense to @@ -88,23 +90,32 @@ CAmount GetDustThreshold(const CTxOut& txout, const CFeeRate& dustRelayFee); bool IsDust(const CTxOut& txout, const CFeeRate& dustRelayFee); bool IsStandard(const CScript& scriptPubKey, TxoutType& whichType); - /** - * Check for standard transaction types - * @return True if all outputs (scriptPubKeys) use only standard transaction forms - */ + + +// Changing the default transaction version requires a two step process: first +// adapting relay policy by bumping TX_MAX_STANDARD_VERSION, and then later +// allowing the new transaction version in the wallet/RPC. +static constexpr decltype(CTransaction::nVersion) TX_MAX_STANDARD_VERSION{2}; + +/** +* Check for standard transaction types +* @return True if all outputs (scriptPubKeys) use only standard transaction forms +*/ bool IsStandardTx(const CTransaction& tx, bool permit_bare_multisig, const CFeeRate& dust_relay_fee, std::string& reason); - /** - * Check for standard transaction types - * @param[in] mapInputs Map of previous transactions that have outputs we're spending - * @param[in] taproot_active Whether or taproot consensus rules are active (used to decide whether spends of them are permitted) - * @return True if all inputs (scriptSigs) use only standard transaction forms - */ +/** +* Check for standard transaction types +* @param[in] mapInputs Map of previous transactions that have outputs we're spending +* @param[in] taproot_active Whether or taproot consensus rules are active (used to decide whether spends of them are permitted) +* @return True if all inputs (scriptSigs) use only standard transaction forms +*/ bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs, bool taproot_active); - /** - * Check if the transaction is over standard P2WSH resources limit: - * 3600bytes witnessScript size, 80bytes per witness stack element, 100 witness stack elements - * These limits are adequate for multi-signature up to n-of-100 using OP_CHECKSIG, OP_ADD, and OP_EQUAL, - */ +/** +* Check if the transaction is over standard P2WSH resources limit: +* 3600bytes witnessScript size, 80bytes per witness stack element, 100 witness stack elements +* These limits are adequate for multisignatures up to n-of-100 using OP_CHECKSIG, OP_ADD, and OP_EQUAL. +* +* Also enforce a maximum stack item size limit and no annexes for tapscript spends. +*/ bool IsWitnessStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs); /** Compute the virtual transaction size (weight reinterpreted as bytes). */ |