1 // Copyright (c) 2009-2010 Satoshi Nakamoto
2 // Copyright (c) 2009-2014 The Bitcoin Core developers
3 // Distributed under the MIT software license, see the accompanying
4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
6 #ifndef BITCOIN_SCRIPT_STANDARD_H
7 #define BITCOIN_SCRIPT_STANDARD_H
9 #include "script/interpreter.h"
12 #include <boost/variant.hpp>
19 /** A reference to a CScript: the Hash160 of its serialization (see script.h) */
20 class CScriptID : public uint160
23 CScriptID() : uint160() {}
24 CScriptID(const CScript& in);
25 CScriptID(const uint160& in) : uint160(in) {}
28 static const unsigned int MAX_OP_RETURN_RELAY = 40; //! bytes
29 extern unsigned nMaxDatacarrierBytes;
32 * Mandatory script verification flags that all new blocks must comply with for
33 * them to be valid. (but old blocks may not comply with) Currently just P2SH,
34 * but in the future other flags may be added, such as a soft-fork to enforce
35 * strict DER encoding.
37 * Failing one of these tests may trigger a DoS ban - see CheckInputs() for
40 static const unsigned int MANDATORY_SCRIPT_VERIFY_FLAGS = SCRIPT_VERIFY_P2SH;
43 * Standard script verification flags that standard transactions will comply
44 * with. However scripts violating these flags may still be present in valid
45 * blocks and we must accept those blocks.
47 static const unsigned int STANDARD_SCRIPT_VERIFY_FLAGS = MANDATORY_SCRIPT_VERIFY_FLAGS |
48 SCRIPT_VERIFY_DERSIG |
49 SCRIPT_VERIFY_STRICTENC |
50 SCRIPT_VERIFY_MINIMALDATA |
51 SCRIPT_VERIFY_NULLDUMMY |
52 SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS |
53 SCRIPT_VERIFY_CLEANSTACK;
55 /** For convenience, standard but not mandatory verify flags. */
56 static const unsigned int STANDARD_NOT_MANDATORY_VERIFY_FLAGS = STANDARD_SCRIPT_VERIFY_FLAGS & ~MANDATORY_SCRIPT_VERIFY_FLAGS;
61 // 'standard' transaction types:
69 class CNoDestination {
71 friend bool operator==(const CNoDestination &a, const CNoDestination &b) { return true; }
72 friend bool operator<(const CNoDestination &a, const CNoDestination &b) { return true; }
76 * A txout script template with a specific destination. It is either:
77 * * CNoDestination: no destination set
78 * * CKeyID: TX_PUBKEYHASH destination
79 * * CScriptID: TX_SCRIPTHASH destination
80 * A CTxDestination is the internal data type encoded in a CBitcoinAddress
82 typedef boost::variant<CNoDestination, CKeyID, CScriptID> CTxDestination;
84 const char* GetTxnOutputType(txnouttype t);
86 bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<std::vector<unsigned char> >& vSolutionsRet);
87 int ScriptSigArgsExpected(txnouttype t, const std::vector<std::vector<unsigned char> >& vSolutions);
88 bool IsStandard(const CScript& scriptPubKey, txnouttype& whichType);
89 bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet);
90 bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<CTxDestination>& addressRet, int& nRequiredRet);
92 CScript GetScriptForDestination(const CTxDestination& dest);
93 CScript GetScriptForMultisig(int nRequired, const std::vector<CPubKey>& keys);
95 #endif // BITCOIN_SCRIPT_STANDARD_H