14 Dec, 2012

1 commit

• facc0a6bd   ASN.1: Define indefinite length marker constant ... Browse Code »

  Define a constant to hold the marker value seen in an indefinite-length
  element.

  Signed-off-by: David Howells
  Signed-off-by: Rusty Russell

  David Howells

  2012-12-14 10:36:41 +0800  

08 Oct, 2012

1 commit

• 4520c6a49   X.509: Add simple ASN.1 grammar compiler ... Browse Code »

  Add a simple ASN.1 grammar compiler. This produces a bytecode output that can
  be fed to a decoder to inform the decoder how to interpret the ASN.1 stream it
  is trying to parse.

  Action functions can be specified in the grammar by interpolating:

  ({ foo })

  after a type, for example:

  SubjectPublicKeyInfo ::= SEQUENCE {
  algorithm AlgorithmIdentifier,
  subjectPublicKey BIT STRING ({ do_key_data })
  }

  The decoder is expected to call these after matching this type and parsing the
  contents if it is a constructed type.

  The grammar compiler does not currently support the SET type (though it does
  support SET OF) as I can't see a good way of tracking which members have been
  encountered yet without using up extra stack space.

  Currently, the grammar compiler will fail if more than 256 bytes of bytecode
  would be produced or more than 256 actions have been specified as it uses
  8-bit jump values and action indices to keep space usage down.

  Signed-off-by: David Howells
  Signed-off-by: Rusty Russell

  David Howells

  2012-10-08 11:20:19 +0800