Problems with GENERAL_NAMES on IMPLICIT mode

[Fernando Moya]

Hi, I am having problems with GENERAL_NAMES in the following sequence: :

---------------------------------------------------------------------

DEFINITIONS IMPLICIT TAGS

Seq1 ::= SEQUENCE
 {
 field1 INTEGER,
 field2 Seq2
 }

Seq2 ::= SEQUENCE
 {
 sub_field1 [0] Sub_seq_000 OPTIONAL,
 sub_field2 [1] GENERAL_NAMES OPTIONAL,
 sub_field3 [2] Sub_seq_200 OPTIONAL
 }

---------------------------------------------------------------------

Implemented by:

ASN1_SEQUENCE(Seq2) = {
    ASN1_IMP_OPT(Seq2, Sub_field1, Sub_seq_000,0),
    ASN1_IMP_OPT(Seq2, Sub_field2, GENERAL_NAMES,1),
    ASN1_IMP_OPT(Seq2, Sub_field3, Sub_seq_200,2),
    } ASN1_SEQUENCE_END(Seq2)

IMPLEMENT_ASN1_FUNCTIONS(Seq2)

ASN1_SEQUENCE(Seq1) = {
    ASN1_SIMPLE(Seq1, field1,INTEGER),
    ASN1_SIMPLE(Seq1, field2, Seq2)
    } ASN1_SEQUENCE_END(Seq1)

IMPLEMENT_ASN1_FUNCTIONS(Seq1)

Note: GENERAL_NAMES is defined at "crypto/x509v3/x509_v3.h" and
"crypto/x509v3/v3_genn.c"

The problem is when I call to "i2d_Seq1" with an example code, the DER
output is:

(output from "ASN.1 Dump Utility")

SEQUENCE
    {
    INTEGER 1
    SEQUENCE
        {
        [0] {
             SEQUENCE
                    {
                    .......
                    }
            }
===>     {
              [2] 'DNS_GENERALNAMES'
              }
        [2] {
             SEQUENCE
                    {
                    .......
                    }
              }
    }

(Attention to the arrow )

instead of:

SEQUENCE
    {
    INTEGER 1
    SEQUENCE
        {
        [0] {
             SEQUENCE
                    {
                    .......
                    }
            }
==> [1]{
              [2] 'DNS_GENERALNAMES'
              }
        [2] {
             SEQUENCE
                    {
                    .......
                    }
              }
    }

The point is, I can't obtain [1] tag in GENERAL_NAMES. I have tried to put
GENERAL_NAMES in other situations (always in IMPLICIT mode) and it never
puts tags. En cambio, I have tried in EXPLICIT mode and it works fine, but I
need IMPLICIT tags.

How can I obtain this IMPLICIT tag in DER output?

Thanks in advance.

Fernando Moya Bernal.
University of Malaga. Spain.



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