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libtasn1: Invoking asn1Coding

 
 3.2 Invoking asn1Coding
 =======================
 
 'asn1Coding' generates a DER encoding from a file with ASN.1 definitions
 and another one with assignments.
 
    The file with assignments must have this syntax:
 
 InstanceName  Asn1Definition
 
 nameString  value
 
 nameString  value
 ...
 
    To specify the field of a 'CHOICE' to be used, specify its name as a
 value to the 'CHOICE' element itself.  Use '''' to denote the root
 element itself.  (as in the example below.)
 
    The output file is a binary file with the DER encoding.
 
 Usage:  asn1Coding [options] file1 file2
  file1 : file with ASN1 definitions.
  file2 : file with assignments.
 Options:
  -h : shows the help message.
  -v : shows version information and exit.
  -c : checks the syntax only.
  -o file : output file.
 
    For example, consider an ASN.1 definitions file as follows:
 
 MYPKIX1 { }
 
 DEFINITIONS IMPLICIT TAGS ::=
 
 BEGIN
 
 OtherStruct := SEQUENCE {
      x       INTEGER,
      y       CHOICE {
          y1 INTEGER,
          y2 OCTET STRING },
 }
 
 Dss-Sig-Value ::= SEQUENCE {
      r       INTEGER,
      s       INTEGER,
      other   OtherStruct
      z       INTEGER OPTIONAL,
 }
 
 END
 
    And a assignments file as follows:
 
 dp MYPKIX1.Dss-Sig-Value
 
 r 42
 s 47
 other.x 66
 other.y y1
 other.y.y1 15
 z (NULL)
 
    Running the command below will generate a 'assign.out' file,
 containing the DER encoding of 'PKIX1.Dss-Sig-Value'.
 
 $ asn1Coding pkix.asn assign.asn1
 
    If the root element is of the 'CHOICE' type, the assignment file may
 be like (using the types defined in 'pkix.asn'):
 elt PKIX1Implicit88.GeneralName
 
 ''      dNSName
 dNSName example.org
 

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