🛠️ [TASK] : Implement encode decode for C509 type Name

[bkioshn]

Summary

Implement encode decode for C509 type Name

Description

Implement encode, decode, and other important functionality for C509 type Name

Given

    Name = [ * RelativeDistinguishedName ] / text / bytes

    RelativeDistinguishedName = Attribute / [ 2* Attribute ]

    Attribute = ( attributeType: int, attributeValue: text ) //
                ( attributeType: ~oid, attributeValue: bytes ) //
                ( attributeType: pen, attributeValue: bytes )

This type Name will be used in various places like GeneralName, subject, and issuer

Note that Attribute is used in various places

      Attributes = ( attributeType: int, attributeValue: [+text] ) //
                   ( attributeType: ~oid, attributeValue: [+bytes] )
      SubjectDirectoryAttributes = [+Attributes]

Attribute used in RelativeDistinguishedName support PEN
Attribute used in Attributes doesn't support PEN and support multiple Attribute value

The implementation should follow the c509 documentation https://datatracker.ietf.org/doc/draft-ietf-cose-cbor-encoded-cert/09/

• Create an Attribute type decode and encode where it will handle attributeType integer value, unwrapped OID, and PEN
• Create a RelativeDistinguishedName type decode and encode
• Create a Name type decode and encode
• Modify the GeneralName to accept Name type
• All special cases should be handled
• Create tests for all use cases

Test cases

Attribute

• Attribute should work for both RelativeDistinguishedName and Attributes.
• Attribute should not have empty attributeValue
• Attributes shoudl not be empty array
• Each Attribute has corresponding integer value associated with the OID (Table 9.3)

Relative Distinguised Name (RDN)

• If only > 1 attributes encode it as array

Name

• 3 special cases for Name CommonName
• Name can contains >= 0 RelativeDistinguisedName if theRelativeDistinguisedName is provided