Add X509 certificate decoder (#1871)

* Initial implementation

* - Add RelativeDistinguishedName::Value parsing
- Add format options for validity fields

* - Move internal implementation to its own namespace
- Implement the rest of the methods

* - Improve the API
- Add tests

* - Update `X509Algorithm` values
- Add more values to `X520DistinguishedName`
- Add more values to `X509ExtensionType`
- Add `X509SerialNumber` class to parse serial numbers
- Add tests
- Add a script to generate certs

* - Add methods to catch ASN.1 read exceptions and throw an appropriate X509 exception
- Add invalid tests

* - Run clang-format
- Add to README.md

* Add doxygen documentation

* Add doxygen documentation for enum values

* Add missing doxygen documentation

* Add remaining doxygen documentation

* Add tests for the ASN.1 changes

* Fmt

* Fix variable type

* - Address build errors on MSVC
- Fix doxygen warning

* Fix most of the memory leaks in MSVC

* Fix remaining memory leaks

* Skip long expiration test in MinGW 32-bit

* Address PR comments

* Address PR comment

Author: seladb

Packet++/CMakeLists.txt

@@ -67,6 +67,7 @@ add_library(
   src/VxlanLayer.cpp
   src/WakeOnLanLayer.cpp
   src/WireGuardLayer.cpp
+  src/X509Decoder.cpp
   # Force hash-library pcapng to be link fully static
 )
 
@@ -140,6 +141,7 @@ set(
   header/VxlanLayer.h
   header/WakeOnLanLayer.h
   header/WireGuardLayer.h
+  header/X509Decoder.h
 )
 
 # Don't use set_target_properties CMake limit to 50 elements
@@ -153,9 +155,10 @@ target_include_directories(
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/header>
     $<INSTALL_INTERFACE:include/pcapplusplus>
     $<INSTALL_INTERFACE:include>
-  # Don't link with hash-library nor EndianPortable as they won't be exported
+  # Don't link with hash-library, EndianPortable and json as they won't be exported
   PRIVATE $<TARGET_PROPERTY:hash-library,INCLUDE_DIRECTORIES>
   PRIVATE $<TARGET_PROPERTY:EndianPortable,INTERFACE_INCLUDE_DIRECTORIES>
+  PRIVATE $<TARGET_PROPERTY:json,INTERFACE_INCLUDE_DIRECTORIES>
 )
 
 target_link_libraries(Packet++ PUBLIC Common++)

Packet++/header/Asn1Codec.h

@@ -850,6 +850,13 @@ namespace pcpp
 			return m_Value.toString();
 		};
 
+		/// @return The byte vector value of this record
+		std::vector<uint8_t> getVecValue()
+		{
+			decodeValueIfNeeded();
+			return m_Value.toBytes();
+		}
+
 	protected:
 		void decodeValue(uint8_t const* data, bool lazy) override;
 		std::vector<uint8_t> encodeValue() const override;