diff options
Diffstat (limited to 'src/script.h')
| -rw-r--r-- | src/script.h | 86 |
1 files changed, 83 insertions, 3 deletions
diff --git a/src/script.h b/src/script.h index fdcf802945..7b0643f70a 100644 --- a/src/script.h +++ b/src/script.h @@ -14,6 +14,7 @@ #include "keystore.h" #include "bignum.h" +class CCoins; class CTransaction; /** Signature hash types/flags */ @@ -25,6 +26,13 @@ enum SIGHASH_ANYONECANPAY = 0x80, }; +/** Script verification flags */ +enum +{ + SCRIPT_VERIFY_NONE = 0, + SCRIPT_VERIFY_P2SH = (1U << 0), + SCRIPT_VERIFY_STRICTENC = (1U << 1), +}; enum txnouttype { @@ -579,11 +587,83 @@ public: } }; +/** Compact serializer for scripts. + * + * It detects common cases and encodes them much more efficiently. + * 3 special cases are defined: + * * Pay to pubkey hash (encoded as 21 bytes) + * * Pay to script hash (encoded as 21 bytes) + * * Pay to pubkey starting with 0x02, 0x03 or 0x04 (encoded as 33 bytes) + * + * Other scripts up to 121 bytes require 1 byte + script length. Above + * that, scripts up to 16505 bytes require 2 bytes + script length. + */ +class CScriptCompressor +{ +private: + // make this static for now (there are only 6 special scripts defined) + // this can potentially be extended together with a new nVersion for + // transactions, in which case this value becomes dependent on nVersion + // and nHeight of the enclosing transaction. + static const unsigned int nSpecialScripts = 6; + + CScript &script; +protected: + // These check for scripts for which a special case with a shorter encoding is defined. + // They are implemented separately from the CScript test, as these test for exact byte + // sequence correspondences, and are more strict. For example, IsToPubKey also verifies + // whether the public key is valid (as invalid ones cannot be represented in compressed + // form). + bool IsToKeyID(CKeyID &hash) const; + bool IsToScriptID(CScriptID &hash) const; + bool IsToPubKey(std::vector<unsigned char> &pubkey) const; + + bool Compress(std::vector<unsigned char> &out) const; + unsigned int GetSpecialSize(unsigned int nSize) const; + bool Decompress(unsigned int nSize, const std::vector<unsigned char> &out); +public: + CScriptCompressor(CScript &scriptIn) : script(scriptIn) { } + + unsigned int GetSerializeSize(int nType, int nVersion) const { + std::vector<unsigned char> compr; + if (Compress(compr)) + return compr.size(); + unsigned int nSize = script.size() + nSpecialScripts; + return script.size() + VARINT(nSize).GetSerializeSize(nType, nVersion); + } + template<typename Stream> + void Serialize(Stream &s, int nType, int nVersion) const { + std::vector<unsigned char> compr; + if (Compress(compr)) { + s << CFlatData(&compr[0], &compr[compr.size()]); + return; + } + unsigned int nSize = script.size() + nSpecialScripts; + s << VARINT(nSize); + s << CFlatData(&script[0], &script[script.size()]); + } + template<typename Stream> + void Unserialize(Stream &s, int nType, int nVersion) { + unsigned int nSize; + s >> VARINT(nSize); + if (nSize < nSpecialScripts) { + std::vector<unsigned char> vch(GetSpecialSize(nSize), 0x00); + s >> REF(CFlatData(&vch[0], &vch[vch.size()])); + Decompress(nSize, vch); + return; + } + nSize -= nSpecialScripts; + script.resize(nSize); + s >> REF(CFlatData(&script[0], &script[script.size()])); + } +}; +bool IsCanonicalPubKey(const std::vector<unsigned char> &vchPubKey); +bool IsCanonicalSignature(const std::vector<unsigned char> &vchSig); -bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, int nHashType); +bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, unsigned int flags, int nHashType); bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<std::vector<unsigned char> >& vSolutionsRet); int ScriptSigArgsExpected(txnouttype t, const std::vector<std::vector<unsigned char> >& vSolutions); bool IsStandard(const CScript& scriptPubKey); @@ -594,8 +674,8 @@ bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, std:: bool SignSignature(const CKeyStore& keystore, const CScript& fromPubKey, CTransaction& txTo, unsigned int nIn, int nHashType=SIGHASH_ALL); bool SignSignature(const CKeyStore& keystore, const CTransaction& txFrom, CTransaction& txTo, unsigned int nIn, int nHashType=SIGHASH_ALL); bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn, - bool fValidatePayToScriptHash, int nHashType); -bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsigned int nIn, bool fValidatePayToScriptHash, int nHashType); + unsigned int flags, int nHashType); +bool VerifySignature(const CCoins& txFrom, const CTransaction& txTo, unsigned int nIn, unsigned int flags, int nHashType); // Given two sets of signatures for scriptPubKey, possibly with OP_0 placeholders, // combine them intelligently and return the result. |