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https://github.com/RGBCube/serenity
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LibCrypo: Add an ASN.1/DER pretty-printer
It's much easier to debug things when we can actually *see* them :P
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2 changed files with 143 additions and 0 deletions
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@ -273,6 +273,147 @@ Optional<DecodeError> Decoder::leave()
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return {};
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}
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void pretty_print(Decoder& decoder, OutputStream& stream, int indent)
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{
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while (!decoder.eof()) {
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auto tag = decoder.peek();
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if (tag.is_error()) {
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dbgln("PrettyPrint error: {}", tag.error());
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return;
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}
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StringBuilder builder;
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for (int i = 0; i < indent; ++i)
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builder.append(' ');
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builder.appendff("<{}> ", class_name(tag.value().class_));
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if (tag.value().type == Type::Constructed) {
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builder.appendff("[{}] {} ({})", type_name(tag.value().type), static_cast<u8>(tag.value().kind), kind_name(tag.value().kind));
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if (auto error = decoder.enter(); error.has_value()) {
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dbgln("Constructed PrettyPrint error: {}", error.value());
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return;
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}
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builder.append('\n');
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stream.write(builder.string_view().bytes());
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pretty_print(decoder, stream, indent + 2);
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if (auto error = decoder.leave(); error.has_value()) {
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dbgln("Constructed PrettyPrint error: {}", error.value());
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return;
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}
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continue;
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} else {
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if (tag.value().class_ != Class::Universal)
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builder.appendff("[{}] {} {}", type_name(tag.value().type), static_cast<u8>(tag.value().kind), kind_name(tag.value().kind));
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else
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builder.appendff("[{}] {}", type_name(tag.value().type), kind_name(tag.value().kind));
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switch (tag.value().kind) {
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case Kind::Eol: {
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auto value = decoder.read<ReadonlyBytes>();
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if (value.is_error()) {
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dbgln("EOL PrettyPrint error: {}", value.error());
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return;
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}
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break;
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}
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case Kind::Boolean: {
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auto value = decoder.read<bool>();
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if (value.is_error()) {
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dbgln("Bool PrettyPrint error: {}", value.error());
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return;
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}
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builder.appendff(" {}", value.value());
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break;
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}
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case Kind::Integer: {
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auto value = decoder.read<ReadonlyBytes>();
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if (value.is_error()) {
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dbgln("Integer PrettyPrint error: {}", value.error());
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return;
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}
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builder.append(" 0x");
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for (auto ch : value.value())
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builder.appendff("{:0>2x}", ch);
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break;
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}
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case Kind::BitString: {
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auto value = decoder.read<const BitmapView>();
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if (value.is_error()) {
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dbgln("BitString PrettyPrint error: {}", value.error());
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return;
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}
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builder.append(" 0b");
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for (size_t i = 0; i < value.value().size(); ++i)
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builder.append(value.value().get(i) ? '1' : '0');
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break;
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}
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case Kind::OctetString: {
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auto value = decoder.read<StringView>();
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if (value.is_error()) {
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dbgln("OctetString PrettyPrint error: {}", value.error());
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return;
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}
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builder.append(" 0x");
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for (auto ch : value.value())
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builder.appendff("{:0>2x}", ch);
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break;
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}
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case Kind::Null: {
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auto value = decoder.read<decltype(nullptr)>();
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if (value.is_error()) {
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dbgln("Bool PrettyPrint error: {}", value.error());
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return;
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}
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break;
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}
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case Kind::ObjectIdentifier: {
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auto value = decoder.read<Vector<int>>();
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if (value.is_error()) {
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dbgln("Identifier PrettyPrint error: {}", value.error());
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return;
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}
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for (auto& id : value.value())
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builder.appendff(" {}", id);
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break;
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}
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case Kind::UTCTime:
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case Kind::GeneralizedTime:
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case Kind::IA5String:
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case Kind::PrintableString: {
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auto value = decoder.read<StringView>();
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if (value.is_error()) {
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dbgln("String PrettyPrint error: {}", value.error());
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return;
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}
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builder.append(' ');
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builder.append(value.value());
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break;
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}
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case Kind::Utf8String: {
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auto value = decoder.read<Utf8View>();
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if (value.is_error()) {
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dbgln("UTF8 PrettyPrint error: {}", value.error());
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return;
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}
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builder.append(' ');
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for (auto cp : value.value())
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builder.append_code_point(cp);
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break;
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}
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case Kind::Sequence:
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case Kind::Set:
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dbgln("Seq/Sequence PrettyPrint error: Unexpected Primtive");
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return;
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}
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}
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builder.append('\n');
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stream.write(builder.string_view().bytes());
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}
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}
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}
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void AK::Formatter<Crypto::ASN1::DecodeError>::format(FormatBuilder& fmtbuilder, Crypto::ASN1::DecodeError error)
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@ -216,6 +216,8 @@ private:
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Optional<Tag> m_current_tag;
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};
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void pretty_print(Decoder&, OutputStream&, int indent = 0);
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}
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template<>
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