Hi,
This specification uses APPLICATION class.In this
class TAGs are unique with in the specification.
So that you can use the tag value for decoding.
In your case, Tag value for usec is 2 and seq-number
is 3.Hope this will help u to solve your issue.
regards,
KB Devaraj
Intec Telecom Systems
Kuala Lumpur,Malaysia.
--- "Gustavo V. G. C. Rios"
<[EMAIL PROTECTED]> wrote:
> Dear gentleman,
>
> i am beginning studying ASN as an requirement for
> understanding kerberV
> security protocol. One of its message specification
> is the following:
>
> KRB-SAFE-BODY ::= [APPLICATION 20] SEQUENCE {
> user-data[0] OCTET STRING,
> timestamp[1] KerberosTime OPTIONAL,
> usec[2] INTEGER OPTIONAL,
> seq-number[3] INTEGER OPTIONAL,
> s-address[4] HostAddress,
> r-address[5] HostAddress OPTIONAL
> }
>
> My doubt regards with the decoding of the input
> stream. For the usec and
> seq-number values i have three possible scenarios:
>
> 0) The two values are present,
> 1) None of them are present,
> 2) Just one of them is present.
>
> Since both are optional and have the same type, for
> scenario 2, how will
> i *correctly* decode an input stream? I.e. , the
> next value to be decode
> is an integer, but will i see it as the usec or the
> seq-number value?
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