* Create the assembly string representation of a CScript object. * @param[in] script CScript object to convert into the asm string representation. * @param[in] fAttemptSighashDecode Whether to attempt to decode sighash types on data within the script that matches the format * of a signature. Only pass true for scripts you believe could contain signature
| 78 | * pass false, or omit the this argument (defaults to false), for scriptPubKeys. |
| 79 | */ |
| 80 | string ScriptToAsmStr(const CScript& script, const bool fAttemptSighashDecode) |
| 81 | { |
| 82 | string str; |
| 83 | opcodetype opcode; |
| 84 | vector<unsigned char> vch; |
| 85 | CScript::const_iterator pc = script.begin(); |
| 86 | while (pc < script.end()) { |
| 87 | if (!str.empty()) { |
| 88 | str += " "; |
| 89 | } |
| 90 | if (!script.GetOp(pc, opcode, vch)) { |
| 91 | str += "[error]"; |
| 92 | return str; |
| 93 | } |
| 94 | if (0 <= opcode && opcode <= OP_PUSHDATA4) { |
| 95 | if (vch.size() <= static_cast<vector<unsigned char>::size_type>(4)) { |
| 96 | str += strprintf("%d", CScriptNum(vch, false).getint()); |
| 97 | } else { |
| 98 | // the IsUnspendable check makes sure not to try to decode OP_RETURN data that may match the format of a signature |
| 99 | if (fAttemptSighashDecode && !script.IsUnspendable()) { |
| 100 | std::string strSigHashDecode; |
| 101 | // goal: only attempt to decode a defined sighash type from |
| 102 | // data that looks like a signature within a scriptSig. This |
| 103 | // won't decode correctly formatted public keys in Pubkey or |
| 104 | // Multisig scripts due to the restrictions on the pubkey |
| 105 | // formats (see IsCompressedOrUncompressedPubKey) being |
| 106 | // incongruous with the checks in CheckSignatureEncoding. |
| 107 | uint32_t flags = SCRIPT_VERIFY_STRICTENC; |
| 108 | if (vch.back() & SIGHASH_FORKID) { |
| 109 | // If the transaction is using SIGHASH_FORKID, we need |
| 110 | // to set the apropriate flag. |
| 111 | // TODO: Remove after the Hard Fork. |
| 112 | flags |= SCRIPT_ENABLE_SIGHASH_FORKID; |
| 113 | } |
| 114 | if (CheckSignatureEncoding(vch, flags, nullptr)) { |
| 115 | const unsigned char chSigHashType = vch.back(); |
| 116 | if (mapSigHashTypes.count(chSigHashType)) { |
| 117 | strSigHashDecode = "[" + mapSigHashTypes.find(chSigHashType)->second + "]"; |
| 118 | vch.pop_back(); // remove the sighash type byte. it will be replaced by the decode. |
| 119 | } |
| 120 | } |
| 121 | str += HexStr(vch) + strSigHashDecode; |
| 122 | } else { |
| 123 | str += HexStr(vch); |
| 124 | } |
| 125 | } |
| 126 | } else { |
| 127 | str += GetOpName(opcode); |
| 128 | } |
| 129 | } |
| 130 | return str; |
| 131 | } |
| 132 | |
| 133 | string EncodeHexTx(const CTransaction& tx) |
| 134 | { |