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Hi all: When encoding extension additions for a sequence type using the
PER UNALIGNED variant, before the bitmap that indicates the presence or absence
of extension additions for the sequence type being encoded, a length
determinant needs to be added indicating the length of this bitmap. Therefore
my question is the value that has to be encoded for the length determinant,
The reason for this question is that I was looking at the
bit patterns output by an ASN.1 tool and it was encoding the length determinant
using the 2nd option that is mentioned above. The folks who maintain
the tool pointed out that the length determinant has to indicate a number of at
least one (see X.691, the note below 18.8) and hence the length can be
normalized by subtracting one from it. Also if the second option is the correct
way, can someone please point out where it is in the spec because I was
following option 1 as this was what I got by reading clause 18.8. Any help is
appreciated! Thanks, Chamira Perera This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful. |
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