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LibCrypto: Allow the user to override the DER read kind and class

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This is useful for parsing non-universal types.
This commit is contained in:
AnotherTest 2021-04-18 13:39:50 +04:30 • committed by Andreas Kling
parent 581f9ff6bb
commit 65de2d236d
1 changed files with 36 additions and 2 deletions
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38
Userland/Libraries/LibCrypto/ASN1/DER.h
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@ -64,8 +64,42 @@ public:
ValueType value;
};
Optional<DecodeError> drop()
{
if (m_stack.is_empty())
return DecodeError::NoInput;
if (eof())
return DecodeError::EndOfStream;
auto previous_position = m_stack;
auto tag_or_error = peek();
if (tag_or_error.is_error()) {
m_stack = move(previous_position);
return tag_or_error.error();
}
auto length_or_error = read_length();
if (length_or_error.is_error()) {
m_stack = move(previous_position);
return length_or_error.error();
}
auto length = length_or_error.value();
auto bytes_result = read_bytes(length);
if (bytes_result.is_error()) {
m_stack = move(previous_position);
return bytes_result.error();
}
m_current_tag.clear();
return {};
}
template<typename ValueType>
Result<ValueType, DecodeError> read()
Result<ValueType, DecodeError> read(Optional<Class> class_override = {}, Optional<Kind> kind_override = {})
{
if (m_stack.is_empty())
return DecodeError::NoInput;
@ -90,7 +124,7 @@ public:
auto tag = tag_or_error.value();
auto length = length_or_error.value();
auto value_or_error = read_value<ValueType>(tag.class_, tag.kind, length);
auto value_or_error = read_value<ValueType>(class_override.value_or(tag.class_), kind_override.value_or(tag.kind), length);
if (value_or_error.is_error()) {
m_stack = move(previous_position);
return value_or_error.error();