Function DecodeDestination

src/key_io.cpp:85–211

};

CTxDestination DecodeDestination(const std::string& str, const CChainParams& params, std::string& error_str, std::vector<int>* error_locations)
{
    std::vector<unsigned char> data;
    uint160 hash;
    error_str = "";

    // Note this will be false if it is a valid Bech32 address for a different network
    bool is_bech32 = (ToLower(str.substr(0, params.Bech32HRP().size())) == params.Bech32HRP());

    if (!is_bech32 && DecodeBase58Check(str, data, 21)) {
        // base58-encoded Bitcoin addresses.
        // Public-key-hash-addresses have version 0 (or 111 testnet).
        // The data vector contains RIPEMD160(SHA256(pubkey)), where pubkey is the serialized public key.
        const std::vector<unsigned char>& pubkey_prefix = params.Base58Prefix(CChainParams::PUBKEY_ADDRESS);
        if (data.size() == hash.size() + pubkey_prefix.size() && std::equal(pubkey_prefix.begin(), pubkey_prefix.end(), data.begin())) {
            std::copy(data.begin() + pubkey_prefix.size(), data.end(), hash.begin());
            return PKHash(hash);
        }
        // Script-hash-addresses have version 5 (or 196 testnet).
        // The data vector contains RIPEMD160(SHA256(cscript)), where cscript is the serialized redemption script.
        const std::vector<unsigned char>& script_prefix = params.Base58Prefix(CChainParams::SCRIPT_ADDRESS);
        if (data.size() == hash.size() + script_prefix.size() && std::equal(script_prefix.begin(), script_prefix.end(), data.begin())) {
            std::copy(data.begin() + script_prefix.size(), data.end(), hash.begin());
            return ScriptHash(hash);
        }

        // If the prefix of data matches either the script or pubkey prefix, the length must have been wrong
        if ((data.size() >= script_prefix.size() &&
                std::equal(script_prefix.begin(), script_prefix.end(), data.begin())) ||
            (data.size() >= pubkey_prefix.size() &&
                std::equal(pubkey_prefix.begin(), pubkey_prefix.end(), data.begin()))) {
            error_str = "Invalid length for Base58 address (P2PKH or P2SH)";
        } else {
            error_str = "Invalid or unsupported Base58-encoded address.";
        }
        return CNoDestination();
    } else if (!is_bech32) {
        // Try Base58 decoding without the checksum, using a much larger max length
        if (!DecodeBase58(str, data, 100)) {
            error_str = "Invalid or unsupported Segwit (Bech32) or Base58 encoding.";
        } else {
            error_str = "Invalid checksum or length of Base58 address (P2PKH or P2SH)";
        }
        return CNoDestination();
    }

    data.clear();
    const auto dec = bech32::Decode(str);
    if (dec.encoding == bech32::Encoding::BECH32 || dec.encoding == bech32::Encoding::BECH32M) {
        if (dec.data.empty()) {
            error_str = "Empty Bech32 data section";
            return CNoDestination();
        }
        // Bech32 decoding
        if (dec.hrp != params.Bech32HRP()) {
            error_str = strprintf("Invalid or unsupported prefix for Segwit (Bech32) address (expected %s, got %s).", params.Bech32HRP(), dec.hrp);
            return CNoDestination();
        }