#24 Object reference not set to an instance of an object.

[Anonymous]

Steps to reproduce:

BNCompile SPNEGO.asn

Create new Console App
Add all generated files
Add following to main:
IDecoder decoder = CoderFactory.getInstance().newDecoder("DER");
NegotiationToken token = decoder.decode<NegotiationToken>(File.Open(@"...NegTokenInit.der", FileMode.Open, FileAccess.Read, FileShare.Read));

This is the ASN spec (from http://www3.tools.ietf.org/html/rfc4178\)

PNEGOASNOneSpec {
iso(1) identified-organization(3) dod(6) internet(1)
security(5) mechanism(5) snego (2) modules(4) spec2(2)
} DEFINITIONS EXPLICIT TAGS ::= BEGIN

MechType ::= OBJECT IDENTIFIER
-- OID represents each security mechanism as suggested by
-- [RFC2743]

MechTypeList ::= SEQUENCE OF MechType

NegotiationToken ::= CHOICE {
negTokenInit [0] NegTokenInit,
negTokenResp [1] NegTokenResp
}

NegTokenInit ::= SEQUENCE {
mechTypes [0] MechTypeList,
reqFlags [1] ContextFlags OPTIONAL,
-- inherited from RFC 2478 for backward compatibility,
-- RECOMMENDED to be left out
mechToken [2] OCTET STRING OPTIONAL,
mechListMIC [3] OCTET STRING OPTIONAL
-- Optional Fields
}
NegTokenResp ::= SEQUENCE {
negState [0] ENUMERATED {
accept-completed (0),
accept-incomplete (1),
reject (2),
request-mic (3)
} OPTIONAL,
-- REQUIRED in the first reply from the target
supportedMech [1] MechType OPTIONAL,
-- present only in the first reply from the target
responseToken [2] OCTET STRING OPTIONAL,
mechListMIC [3] OCTET STRING OPTIONAL
-- Optional Fields
}

ContextFlags ::= BIT STRING {
delegFlag (0),
mutualFlag (1),
replayFlag (2),
sequenceFlag (3),
anonFlag (4),
confFlag (5),
integFlag (6)
} (SIZE (32))

END

[Nobody/Anonymous]

Raw datadump with Wireshark of negtokeninit SPNEGO token