2.1 ASN.1 syntax

The parser is case sensitive. The comments begin with "– " and end at the end of lines. An example is in "pkix.asn" file. ASN.1 definitions must have this syntax:

      definitions_name {<object definition>}

      DEFINITIONS <EXPLICIT or IMPLICIT> TAGS ::=

      BEGIN 

      <type and constants definitions>

      END

The token "::=" must be separate from others elements, so this is a wrong declaration:

      ;; INCORRECT
      Version ::=INTEGER

the correct form is:

   Version ::= INTEGER

Here is the list of types that the parser can manage:

• INTEGER
• ENUMERATED
• BOOLEAN
• OBJECT IDENTIFIER
• NULL
• BIT STRING
• OCTET STRING
• UTCTime
• GeneralizedTime
• GeneralString
• SEQUENCE
• SEQUENCE OF
• SET
• SET OF
• CHOICE
• ANY
• ANY DEFINED BY

This version doesn't manage REAL type. It doesn't allow the "EXPORT" and "IMPORT" sections too.

The SIZE constraints are allowed, but no check is done on them.