Bitcoin Core  0.18.99
P2P Digital Currency
Functions
policy.h File Reference
#include <consensus/consensus.h>
#include <policy/feerate.h>
#include <script/interpreter.h>
#include <script/standard.h>
#include <string>
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Functions

CAmount GetDustThreshold (const CTxOut &txout, const CFeeRate &dustRelayFee)
 
bool IsDust (const CTxOut &txout, const CFeeRate &dustRelayFee)
 
bool IsStandard (const CScript &scriptPubKey, txnouttype &whichType)
 
bool IsStandardTx (const CTransaction &tx, bool permit_bare_multisig, const CFeeRate &dust_relay_fee, std::string &reason)
 Check for standard transaction types. More...
 
bool AreInputsStandard (const CTransaction &tx, const CCoinsViewCache &mapInputs)
 Check for standard transaction types. More...
 
bool IsWitnessStandard (const CTransaction &tx, const CCoinsViewCache &mapInputs)
 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,. More...
 
int64_t GetVirtualTransactionSize (int64_t nWeight, int64_t nSigOpCost, unsigned int bytes_per_sigop)
 Compute the virtual transaction size (weight reinterpreted as bytes). More...
 
int64_t GetVirtualTransactionSize (const CTransaction &tx, int64_t nSigOpCost, unsigned int bytes_per_sigop)
 
int64_t GetVirtualTransactionInputSize (const CTxIn &tx, int64_t nSigOpCost, unsigned int bytes_per_sigop)
 

Function Documentation

◆ AreInputsStandard()

bool AreInputsStandard ( const CTransaction tx,
const CCoinsViewCache mapInputs 
)

Check for standard transaction types.

Parameters
[in]mapInputsMap of previous transactions that have outputs we're spending
Returns
True if all inputs (scriptSigs) use only standard transaction forms

Check for standard transaction types.

  1. scriptSigs with extra data stuffed into them, not consumed by scriptPubKey (or P2SH script)
  2. P2SH scripts with a crazy number of expensive CHECKSIG/CHECKMULTISIG operations

Why bother? To avoid denial-of-service attacks; an attacker can submit a standard HASH... OP_EQUAL transaction, which will get accepted into blocks. The redemption script can be anything; an attacker could use a very expensive-to-check-upon-redemption script like: DUP CHECKSIG DROP ... repeated 100 times... OP_1

Definition at line 156 of file policy.cpp.

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◆ GetDustThreshold()

CAmount GetDustThreshold ( const CTxOut txout,
const CFeeRate dustRelayFee 
)

Definition at line 14 of file policy.cpp.

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◆ GetVirtualTransactionInputSize()

int64_t GetVirtualTransactionInputSize ( const CTxIn tx,
int64_t  nSigOpCost,
unsigned int  bytes_per_sigop 
)

Definition at line 248 of file policy.cpp.

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◆ GetVirtualTransactionSize() [1/2]

int64_t GetVirtualTransactionSize ( int64_t  nWeight,
int64_t  nSigOpCost,
unsigned int  bytes_per_sigop 
)

Compute the virtual transaction size (weight reinterpreted as bytes).

Definition at line 238 of file policy.cpp.

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◆ GetVirtualTransactionSize() [2/2]

int64_t GetVirtualTransactionSize ( const CTransaction tx,
int64_t  nSigOpCost,
unsigned int  bytes_per_sigop 
)

Definition at line 243 of file policy.cpp.

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◆ IsDust()

bool IsDust ( const CTxOut txout,
const CFeeRate dustRelayFee 
)

Definition at line 48 of file policy.cpp.

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◆ IsStandard()

bool IsStandard ( const CScript scriptPubKey,
txnouttype whichType 
)

Definition at line 53 of file policy.cpp.

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◆ IsStandardTx()

bool IsStandardTx ( const CTransaction tx,
bool  permit_bare_multisig,
const CFeeRate dust_relay_fee,
std::string &  reason 
)

Check for standard transaction types.

Returns
True if all outputs (scriptPubKeys) use only standard transaction forms

Definition at line 76 of file policy.cpp.

◆ IsWitnessStandard()

bool IsWitnessStandard ( const CTransaction tx,
const CCoinsViewCache mapInputs 
)

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,.

Definition at line 186 of file policy.cpp.

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