Function ParsePubkey

src/script/descriptor.cpp:1001–1035

Parse a public key including origin information (if enabled). */

/** Parse a public key including origin information (if enabled). */
std::unique_ptr<PubkeyProvider> ParsePubkey(uint32_t key_exp_index, const Span<const char>& sp, ParseScriptContext ctx, FlatSigningProvider& out, std::string& error)
{
    using namespace spanparsing;

    auto origin_split = Split(sp, ']');
    if (origin_split.size() > 2) {
        error = "Multiple ']' characters found for a single pubkey";
        return nullptr;
    }
    if (origin_split.size() == 1) return ParsePubkeyInner(key_exp_index, origin_split[0], ctx, out, error);
    if (origin_split[0].empty() || origin_split[0][0] != '[') {
        error = strprintf("Key origin start '[ character expected but not found, got '%c' instead",
                          origin_split[0].empty() ? /** empty, implies split char */ ']' : origin_split[0][0]);
        return nullptr;
    }
    auto slash_split = Split(origin_split[0].subspan(1), '/');
    if (slash_split[0].size() != 8) {
        error = strprintf("Fingerprint is not 4 bytes (%u characters instead of 8 characters)", slash_split[0].size());
        return nullptr;
    }
    std::string fpr_hex = std::string(slash_split[0].begin(), slash_split[0].end());
    if (!IsHex(fpr_hex)) {
        error = strprintf("Fingerprint '%s' is not hex", fpr_hex);
        return nullptr;
    }
    auto fpr_bytes = ParseHex(fpr_hex);
    KeyOriginInfo info;
    static_assert(sizeof(info.fingerprint) == 4, "Fingerprint must be 4 bytes");
    assert(fpr_bytes.size() == 4);
    std::copy(fpr_bytes.begin(), fpr_bytes.end(), info.fingerprint);
    if (!ParseKeyPath(slash_split, info.path, error)) return nullptr;
    auto provider = ParsePubkeyInner(key_exp_index, origin_split[1], ctx, out, error);
    if (!provider) return nullptr;
    return std::make_unique<OriginPubkeyProvider>(key_exp_index, std::move(info), std::move(provider));
}

/** Parse a script in a particular context. */
std::unique_ptr<DescriptorImpl> ParseScript(uint32_t& key_exp_index, Span<const char>& sp, ParseScriptContext ctx, FlatSigningProvider& out, std::string& error)