182 lines
7 KiB
C++
182 lines
7 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2016 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_SCRIPT_INTERPRETER_H
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#define BITCOIN_SCRIPT_INTERPRETER_H
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#include "script_error.h"
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#include "primitives/transaction.h"
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#include <vector>
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#include <stdint.h>
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#include <string>
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class CPubKey;
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class CScript;
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class CTransaction;
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class uint256;
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/** Signature hash types/flags */
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enum
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{
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SIGHASH_ALL = 1,
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SIGHASH_NONE = 2,
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SIGHASH_SINGLE = 3,
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SIGHASH_ANYONECANPAY = 0x80,
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};
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/** Script verification flags */
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enum
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{
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SCRIPT_VERIFY_NONE = 0,
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// Evaluate P2SH subscripts (softfork safe, BIP16).
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SCRIPT_VERIFY_P2SH = (1U << 0),
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// Passing a non-strict-DER signature or one with undefined hashtype to a checksig operation causes script failure.
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// Evaluating a pubkey that is not (0x04 + 64 bytes) or (0x02 or 0x03 + 32 bytes) by checksig causes script failure.
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// (softfork safe, but not used or intended as a consensus rule).
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SCRIPT_VERIFY_STRICTENC = (1U << 1),
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// Passing a non-strict-DER signature to a checksig operation causes script failure (softfork safe, BIP62 rule 1)
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SCRIPT_VERIFY_DERSIG = (1U << 2),
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// Passing a non-strict-DER signature or one with S > order/2 to a checksig operation causes script failure
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// (softfork safe, BIP62 rule 5).
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SCRIPT_VERIFY_LOW_S = (1U << 3),
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// verify dummy stack item consumed by CHECKMULTISIG is of zero-length (softfork safe, BIP62 rule 7).
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SCRIPT_VERIFY_NULLDUMMY = (1U << 4),
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// Using a non-push operator in the scriptSig causes script failure (softfork safe, BIP62 rule 2).
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SCRIPT_VERIFY_SIGPUSHONLY = (1U << 5),
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// Require minimal encodings for all push operations (OP_0... OP_16, OP_1NEGATE where possible, direct
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// pushes up to 75 bytes, OP_PUSHDATA up to 255 bytes, OP_PUSHDATA2 for anything larger). Evaluating
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// any other push causes the script to fail (BIP62 rule 3).
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// In addition, whenever a stack element is interpreted as a number, it must be of minimal length (BIP62 rule 4).
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// (softfork safe)
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SCRIPT_VERIFY_MINIMALDATA = (1U << 6),
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// Discourage use of NOPs reserved for upgrades (NOP1-10)
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//
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// Provided so that nodes can avoid accepting or mining transactions
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// containing executed NOP's whose meaning may change after a soft-fork,
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// thus rendering the script invalid; with this flag set executing
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// discouraged NOPs fails the script. This verification flag will never be
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// a mandatory flag applied to scripts in a block. NOPs that are not
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// executed, e.g. within an unexecuted IF ENDIF block, are *not* rejected.
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SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS = (1U << 7),
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// Require that only a single stack element remains after evaluation. This changes the success criterion from
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// "At least one stack element must remain, and when interpreted as a boolean, it must be true" to
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// "Exactly one stack element must remain, and when interpreted as a boolean, it must be true".
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// (softfork safe, BIP62 rule 6)
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// Note: CLEANSTACK should never be used without P2SH or WITNESS.
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SCRIPT_VERIFY_CLEANSTACK = (1U << 8),
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// Verify CHECKLOCKTIMEVERIFY
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//
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// See BIP65 for details.
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SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY = (1U << 9),
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// support CHECKSEQUENCEVERIFY opcode
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//
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// See BIP112 for details
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SCRIPT_VERIFY_CHECKSEQUENCEVERIFY = (1U << 10),
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// Support segregated witness
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//
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SCRIPT_VERIFY_WITNESS = (1U << 11),
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// Making v1-v16 witness program non-standard
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//
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SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM = (1U << 12),
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// Segwit script only: Require the argument of OP_IF/NOTIF to be exactly 0x01 or empty vector
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//
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SCRIPT_VERIFY_MINIMALIF = (1U << 13),
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// Signature(s) must be empty vector if an CHECK(MULTI)SIG operation failed
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//
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SCRIPT_VERIFY_NULLFAIL = (1U << 14),
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// Public keys in segregated witness scripts must be compressed
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//
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SCRIPT_VERIFY_WITNESS_PUBKEYTYPE = (1U << 15),
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};
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bool CheckSignatureEncoding(const std::vector<unsigned char> &vchSig, unsigned int flags, ScriptError* serror);
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struct PrecomputedTransactionData
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{
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uint256 hashPrevouts, hashSequence, hashOutputs;
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explicit PrecomputedTransactionData(const CTransaction& tx);
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};
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enum SigVersion
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{
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SIGVERSION_BASE = 0,
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SIGVERSION_WITNESS_V0 = 1,
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};
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uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, const CAmount& amount, SigVersion sigversion, const PrecomputedTransactionData* cache = nullptr);
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class BaseSignatureChecker
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{
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public:
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virtual bool CheckSig(const std::vector<unsigned char>& scriptSig, const std::vector<unsigned char>& vchPubKey, const CScript& scriptCode, SigVersion sigversion) const
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{
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return false;
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}
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virtual bool CheckLockTime(const CScriptNum& nLockTime) const
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{
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return false;
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}
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virtual bool CheckSequence(const CScriptNum& nSequence) const
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{
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return false;
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}
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virtual ~BaseSignatureChecker() {}
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};
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class TransactionSignatureChecker : public BaseSignatureChecker
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{
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private:
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const CTransaction* txTo;
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unsigned int nIn;
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const CAmount amount;
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const PrecomputedTransactionData* txdata;
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protected:
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virtual bool VerifySignature(const std::vector<unsigned char>& vchSig, const CPubKey& vchPubKey, const uint256& sighash) const;
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public:
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TransactionSignatureChecker(const CTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn) : txTo(txToIn), nIn(nInIn), amount(amountIn), txdata(nullptr) {}
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TransactionSignatureChecker(const CTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn, const PrecomputedTransactionData& txdataIn) : txTo(txToIn), nIn(nInIn), amount(amountIn), txdata(&txdataIn) {}
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bool CheckSig(const std::vector<unsigned char>& scriptSig, const std::vector<unsigned char>& vchPubKey, const CScript& scriptCode, SigVersion sigversion) const override;
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bool CheckLockTime(const CScriptNum& nLockTime) const override;
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bool CheckSequence(const CScriptNum& nSequence) const override;
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};
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class MutableTransactionSignatureChecker : public TransactionSignatureChecker
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{
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private:
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const CTransaction txTo;
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public:
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MutableTransactionSignatureChecker(const CMutableTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn) : TransactionSignatureChecker(&txTo, nInIn, amountIn), txTo(*txToIn) {}
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};
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bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, unsigned int flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptError* error = nullptr);
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bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CScriptWitness* witness, unsigned int flags, const BaseSignatureChecker& checker, ScriptError* serror = nullptr);
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size_t CountWitnessSigOps(const CScript& scriptSig, const CScript& scriptPubKey, const CScriptWitness* witness, unsigned int flags);
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#endif // BITCOIN_SCRIPT_INTERPRETER_H
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