ASN.1 2002 Tutorial

1
ASN.1 2002 Tutorial

• Jim Schaad

2
Why we care

• Paul Hoffman and Jim Schaad have a contract to
  develop a freeware 2002 ASN.1 compiler
• Expect to be released by the end of the year
• We will be doing updates to core 1988 ASN.1
  modules

3
Component Relation Constraint

• ContentInfo SEQUENCE
• contentType CONTENT-TYPE.id(ContentS
  et),
• content 0 EXPLICIT
  CONTENT-TYPE.Type
• 
  (ContentSet_at_contentType)
• ContentSet CONTENT-TYPE
• -- Define the set of content types to be
  recognized.
• -- Import and add any from external modules
  at this point.
• --
• ct-Data ct-SignedData ct-EncryptedData
  ct-EnvelopedData
• ct-AuthenticatedData ct-DigestedData,

4
Algorithms Constraint

• DigestAlgorithmList ALGORITHM
• -- Include digest algorithm set here
• alg-sha-1 alg-md5,
• DigestAlgorithmIdentifier AlgorithmIdentifier
  DigestAlgorithmList

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Algorithm Associations

• ALGORITHM CLASS
• id OBJECT IDENTIFIER UNIQUE,
• ExtnType
• WITH SYNTAX PARAMS ExtnType IDENTIFIED BY id
  
• Add other fields?
• ltID, Params, Valuegt
• Use different ones for Signature, Encrypted Data
  and Key

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Extensibility

• RecipientInfo CHOICE
• ktri KeyTransRecipientInfo,
• kari 1 KeyAgreeRecipientInfo,
• kekri 2 KEKRecipientInfo,
• pwri 3 PasswordRecipientInfo,
• ori 4 OtherRecipientInfo,
• Other structures as well.

7
Questions

• Other items we should use?
• Should we do as much decoration as possible?
• People who want specific compiler features see
  me after the meeting.