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LibCrypo: Add an ASN.1/DER pretty-printer

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It's much easier to debug things when we can actually *see* them :P
This commit is contained in:
AnotherTest 2021-04-18 13:40:40 +04:30 • committed by Andreas Kling
parent 65de2d236d
commit ed28008d78
2 changed files with 143 additions and 0 deletions
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141
Userland/Libraries/LibCrypto/ASN1/DER.cpp
View file

@ -273,6 +273,147 @@ Optional<DecodeError> Decoder::leave()
return {};
}
void pretty_print(Decoder& decoder, OutputStream& stream, int indent)
{
while (!decoder.eof()) {
auto tag = decoder.peek();
if (tag.is_error()) {
dbgln("PrettyPrint error: {}", tag.error());
return;
}
StringBuilder builder;
for (int i = 0; i < indent; ++i)
builder.append(' ');
builder.appendff("<{}> ", class_name(tag.value().class_));
if (tag.value().type == Type::Constructed) {
builder.appendff("[{}] {} ({})", type_name(tag.value().type), static_cast<u8>(tag.value().kind), kind_name(tag.value().kind));
if (auto error = decoder.enter(); error.has_value()) {
dbgln("Constructed PrettyPrint error: {}", error.value());
return;
}
builder.append('\n');
stream.write(builder.string_view().bytes());
pretty_print(decoder, stream, indent + 2);
if (auto error = decoder.leave(); error.has_value()) {
dbgln("Constructed PrettyPrint error: {}", error.value());
return;
}
continue;
} else {
if (tag.value().class_ != Class::Universal)
builder.appendff("[{}] {} {}", type_name(tag.value().type), static_cast<u8>(tag.value().kind), kind_name(tag.value().kind));
else
builder.appendff("[{}] {}", type_name(tag.value().type), kind_name(tag.value().kind));
switch (tag.value().kind) {
case Kind::Eol: {
auto value = decoder.read<ReadonlyBytes>();
if (value.is_error()) {
dbgln("EOL PrettyPrint error: {}", value.error());
return;
}
break;
}
case Kind::Boolean: {
auto value = decoder.read<bool>();
if (value.is_error()) {
dbgln("Bool PrettyPrint error: {}", value.error());
return;
}
builder.appendff(" {}", value.value());
break;
}
case Kind::Integer: {
auto value = decoder.read<ReadonlyBytes>();
if (value.is_error()) {
dbgln("Integer PrettyPrint error: {}", value.error());
return;
}
builder.append(" 0x");
for (auto ch : value.value())
builder.appendff("{:0>2x}", ch);
break;
}
case Kind::BitString: {
auto value = decoder.read<const BitmapView>();
if (value.is_error()) {
dbgln("BitString PrettyPrint error: {}", value.error());
return;
}
builder.append(" 0b");
for (size_t i = 0; i < value.value().size(); ++i)
builder.append(value.value().get(i) ? '1' : '0');
break;
}
case Kind::OctetString: {
auto value = decoder.read<StringView>();
if (value.is_error()) {
dbgln("OctetString PrettyPrint error: {}", value.error());
return;
}
builder.append(" 0x");
for (auto ch : value.value())
builder.appendff("{:0>2x}", ch);
break;
}
case Kind::Null: {
auto value = decoder.read<decltype(nullptr)>();
if (value.is_error()) {
dbgln("Bool PrettyPrint error: {}", value.error());
return;
}
break;
}
case Kind::ObjectIdentifier: {
auto value = decoder.read<Vector<int>>();
if (value.is_error()) {
dbgln("Identifier PrettyPrint error: {}", value.error());
return;
}
for (auto& id : value.value())
builder.appendff(" {}", id);
break;
}
case Kind::UTCTime:
case Kind::GeneralizedTime:
case Kind::IA5String:
case Kind::PrintableString: {
auto value = decoder.read<StringView>();
if (value.is_error()) {
dbgln("String PrettyPrint error: {}", value.error());
return;
}
builder.append(' ');
builder.append(value.value());
break;
}
case Kind::Utf8String: {
auto value = decoder.read<Utf8View>();
if (value.is_error()) {
dbgln("UTF8 PrettyPrint error: {}", value.error());
return;
}
builder.append(' ');
for (auto cp : value.value())
builder.append_code_point(cp);
break;
}
case Kind::Sequence:
case Kind::Set:
dbgln("Seq/Sequence PrettyPrint error: Unexpected Primtive");
return;
}
}
builder.append('\n');
stream.write(builder.string_view().bytes());
}
}
}
void AK::Formatter<Crypto::ASN1::DecodeError>::format(FormatBuilder& fmtbuilder, Crypto::ASN1::DecodeError error)

2
Userland/Libraries/LibCrypto/ASN1/DER.h
View file

@ -216,6 +216,8 @@ private:
Optional<Tag> m_current_tag;
};
void pretty_print(Decoder&, OutputStream&, int indent = 0);
}
template<>