diff options
Diffstat (limited to 'src/script/interpreter.h')
-rw-r--r-- | src/script/interpreter.h | 38 |
1 files changed, 22 insertions, 16 deletions
diff --git a/src/script/interpreter.h b/src/script/interpreter.h index ab1dc4e681..83a96739b1 100644 --- a/src/script/interpreter.h +++ b/src/script/interpreter.h @@ -6,8 +6,8 @@ #ifndef BITCOIN_SCRIPT_INTERPRETER_H #define BITCOIN_SCRIPT_INTERPRETER_H -#include "script_error.h" -#include "primitives/transaction.h" +#include <script/script_error.h> +#include <primitives/transaction.h> #include <vector> #include <stdint.h> @@ -27,37 +27,40 @@ enum SIGHASH_ANYONECANPAY = 0x80, }; -/** Script verification flags */ +/** Script verification flags. + * + * All flags are intended to be soft forks: the set of acceptable scripts under + * flags (A | B) is a subset of the acceptable scripts under flag (A). + */ enum { SCRIPT_VERIFY_NONE = 0, - // Evaluate P2SH subscripts (softfork safe, BIP16). + // Evaluate P2SH subscripts (BIP16). SCRIPT_VERIFY_P2SH = (1U << 0), // Passing a non-strict-DER signature or one with undefined hashtype to a checksig operation causes script failure. // Evaluating a pubkey that is not (0x04 + 64 bytes) or (0x02 or 0x03 + 32 bytes) by checksig causes script failure. - // (softfork safe, but not used or intended as a consensus rule). + // (not used or intended as a consensus rule). SCRIPT_VERIFY_STRICTENC = (1U << 1), - // Passing a non-strict-DER signature to a checksig operation causes script failure (softfork safe, BIP62 rule 1) + // Passing a non-strict-DER signature to a checksig operation causes script failure (BIP62 rule 1) SCRIPT_VERIFY_DERSIG = (1U << 2), // Passing a non-strict-DER signature or one with S > order/2 to a checksig operation causes script failure - // (softfork safe, BIP62 rule 5). + // (BIP62 rule 5). SCRIPT_VERIFY_LOW_S = (1U << 3), - // verify dummy stack item consumed by CHECKMULTISIG is of zero-length (softfork safe, BIP62 rule 7). + // verify dummy stack item consumed by CHECKMULTISIG is of zero-length (BIP62 rule 7). SCRIPT_VERIFY_NULLDUMMY = (1U << 4), - // Using a non-push operator in the scriptSig causes script failure (softfork safe, BIP62 rule 2). + // Using a non-push operator in the scriptSig causes script failure (BIP62 rule 2). SCRIPT_VERIFY_SIGPUSHONLY = (1U << 5), // Require minimal encodings for all push operations (OP_0... OP_16, OP_1NEGATE where possible, direct // pushes up to 75 bytes, OP_PUSHDATA up to 255 bytes, OP_PUSHDATA2 for anything larger). Evaluating // any other push causes the script to fail (BIP62 rule 3). // In addition, whenever a stack element is interpreted as a number, it must be of minimal length (BIP62 rule 4). - // (softfork safe) SCRIPT_VERIFY_MINIMALDATA = (1U << 6), // Discourage use of NOPs reserved for upgrades (NOP1-10) @@ -68,12 +71,14 @@ enum // discouraged NOPs fails the script. This verification flag will never be // a mandatory flag applied to scripts in a block. NOPs that are not // executed, e.g. within an unexecuted IF ENDIF block, are *not* rejected. + // NOPs that have associated forks to give them new meaning (CLTV, CSV) + // are not subject to this rule. SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS = (1U << 7), // Require that only a single stack element remains after evaluation. This changes the success criterion from // "At least one stack element must remain, and when interpreted as a boolean, it must be true" to // "Exactly one stack element must remain, and when interpreted as a boolean, it must be true". - // (softfork safe, BIP62 rule 6) + // (BIP62 rule 6) // Note: CLEANSTACK should never be used without P2SH or WITNESS. SCRIPT_VERIFY_CLEANSTACK = (1U << 8), @@ -113,8 +118,9 @@ bool CheckSignatureEncoding(const std::vector<unsigned char> &vchSig, unsigned i struct PrecomputedTransactionData { uint256 hashPrevouts, hashSequence, hashOutputs; + bool ready = false; - PrecomputedTransactionData(const CTransaction& tx); + explicit PrecomputedTransactionData(const CTransaction& tx); }; enum SigVersion @@ -123,7 +129,7 @@ enum SigVersion SIGVERSION_WITNESS_V0 = 1, }; -uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, const CAmount& amount, SigVersion sigversion, const PrecomputedTransactionData* cache = NULL); +uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, const CAmount& amount, SigVersion sigversion, const PrecomputedTransactionData* cache = nullptr); class BaseSignatureChecker { @@ -158,7 +164,7 @@ protected: virtual bool VerifySignature(const std::vector<unsigned char>& vchSig, const CPubKey& vchPubKey, const uint256& sighash) const; public: - TransactionSignatureChecker(const CTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn) : txTo(txToIn), nIn(nInIn), amount(amountIn), txdata(NULL) {} + TransactionSignatureChecker(const CTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn) : txTo(txToIn), nIn(nInIn), amount(amountIn), txdata(nullptr) {} TransactionSignatureChecker(const CTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn, const PrecomputedTransactionData& txdataIn) : txTo(txToIn), nIn(nInIn), amount(amountIn), txdata(&txdataIn) {} bool CheckSig(const std::vector<unsigned char>& scriptSig, const std::vector<unsigned char>& vchPubKey, const CScript& scriptCode, SigVersion sigversion) const override; bool CheckLockTime(const CScriptNum& nLockTime) const override; @@ -174,8 +180,8 @@ public: MutableTransactionSignatureChecker(const CMutableTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn) : TransactionSignatureChecker(&txTo, nInIn, amountIn), txTo(*txToIn) {} }; -bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, unsigned int flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptError* error = NULL); -bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CScriptWitness* witness, unsigned int flags, const BaseSignatureChecker& checker, ScriptError* serror = NULL); +bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, unsigned int flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptError* error = nullptr); +bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CScriptWitness* witness, unsigned int flags, const BaseSignatureChecker& checker, ScriptError* serror = nullptr); size_t CountWitnessSigOps(const CScript& scriptSig, const CScript& scriptPubKey, const CScriptWitness* witness, unsigned int flags); |