* Return public keys or hashes from scriptPubKey, for 'standard' transaction types. */
| 38 | * Return public keys or hashes from scriptPubKey, for 'standard' transaction types. |
| 39 | */ |
| 40 | bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, vector<vector<unsigned char> >& vSolutionsRet) |
| 41 | { |
| 42 | // Templates |
| 43 | static multimap<txnouttype, CScript> mTemplates; |
| 44 | if (mTemplates.empty()) |
| 45 | { |
| 46 | // Standard tx, sender provides pubkey, receiver adds signature |
| 47 | mTemplates.insert(make_pair(TX_PUBKEY, CScript() << OP_PUBKEY << OP_CHECKSIG)); |
| 48 | |
| 49 | // Bitcoin address tx, sender provides hash of pubkey, receiver provides signature and pubkey |
| 50 | mTemplates.insert(make_pair(TX_PUBKEYHASH, CScript() << OP_DUP << OP_HASH160 << OP_PUBKEYHASH << OP_EQUALVERIFY << OP_CHECKSIG)); |
| 51 | |
| 52 | // Sender provides N pubkeys, receivers provides M signatures |
| 53 | mTemplates.insert(make_pair(TX_MULTISIG, CScript() << OP_SMALLINTEGER << OP_PUBKEYS << OP_SMALLINTEGER << OP_CHECKMULTISIG)); |
| 54 | |
| 55 | // Empty, provably prunable, data-carrying output |
| 56 | if (GetBoolArg("-datacarrier", true)) |
| 57 | mTemplates.insert(make_pair(TX_NULL_DATA, CScript() << OP_RETURN << OP_SMALLDATA)); |
| 58 | mTemplates.insert(make_pair(TX_NULL_DATA, CScript() << OP_RETURN)); |
| 59 | } |
| 60 | |
| 61 | // Shortcut for pay-to-script-hash, which are more constrained than the other types: |
| 62 | // it is always OP_HASH160 20 [20 byte hash] OP_EQUAL |
| 63 | if (scriptPubKey.IsPayToScriptHash()) |
| 64 | { |
| 65 | typeRet = TX_SCRIPTHASH; |
| 66 | vector<unsigned char> hashBytes(scriptPubKey.begin()+2, scriptPubKey.begin()+22); |
| 67 | vSolutionsRet.push_back(hashBytes); |
| 68 | return true; |
| 69 | } |
| 70 | |
| 71 | // Scan templates |
| 72 | const CScript& script1 = scriptPubKey; |
| 73 | BOOST_FOREACH(const PAIRTYPE(txnouttype, CScript)& tplate, mTemplates) |
| 74 | { |
| 75 | const CScript& script2 = tplate.second; |
| 76 | vSolutionsRet.clear(); |
| 77 | |
| 78 | opcodetype opcode1, opcode2; |
| 79 | vector<unsigned char> vch1, vch2; |
| 80 | |
| 81 | // Compare |
| 82 | CScript::const_iterator pc1 = script1.begin(); |
| 83 | CScript::const_iterator pc2 = script2.begin(); |
| 84 | while (true) |
| 85 | { |
| 86 | if (pc1 == script1.end() && pc2 == script2.end()) |
| 87 | { |
| 88 | // Found a match |
| 89 | typeRet = tplate.first; |
| 90 | if (typeRet == TX_MULTISIG) |
| 91 | { |
| 92 | // Additional checks for TX_MULTISIG: |
| 93 | unsigned char m = vSolutionsRet.front()[0]; |
| 94 | unsigned char n = vSolutionsRet.back()[0]; |
| 95 | if (m < 1 || n < 1 || m > n || vSolutionsRet.size()-2 != n) |
| 96 | return false; |
| 97 | } |