public static void ReadWithInsufficientData(string inputHex)
{
byte[] inputData = inputHex.HexToByteArray();
AsnReader reader = new AsnReader(inputData, AsnEncodingRules.DER);
Assert.Throws <CryptographicException>(() => reader.ReadTagAndLength(out _, out _));
}
public static bool CanDecode(ReadOnlyMemory <byte> encoded)
{
var reader = new AsnReader(encoded, AsnEncodingRules.DER);
var tag = reader.ReadTagAndLength(out _, out _);
return(tag.HasSameClassAndValue(KrbErrorTag));
}
private protected static bool CanDecode(ReadOnlyMemory <byte> encoded, Asn1Tag expectedTag)
{
var reader = new AsnReader(encoded, AsnEncodingRules.DER);
var tag = reader.ReadTagAndLength(out _, out _);
return(tag.HasSameClassAndValue(expectedTag));
}
public static void InvalidLengths(
string description,
PublicEncodingRules rules,
string inputHex)
{
byte[] inputData = inputHex.HexToByteArray();
AsnReader reader = new AsnReader(inputData, (AsnEncodingRules)rules);
Assert.Throws <CryptographicException>(() => reader.ReadTagAndLength(out _, out _));
}
public PrincipalName(ref AsnReader reader)
{
var tag = reader.ReadTagAndLength(out var contentLength, out var bytesRead);
reader = reader.AdvanceReader(bytesRead);
if (tag.TagClass != TagClass.Universal || tag.TagValue != (int)UniversalTagNumber.Sequence)
{
throw new InvalidOperationException("Not a sequence but " + tag);
}
while (reader.HasData)
{
tag = reader.ReadTagAndLength(out contentLength, out bytesRead);
reader = reader.AdvanceReader(bytesRead);
if (tag.TagClass == TagClass.ContextSpecific)
{
switch (tag.TagValue)
{
case 0:
Type = (NameType)(int)reader.GetInteger();
break;
case 1:
reader = reader.ReadSequence();
var names = new List <string>();
while (reader.HasData)
{
names.Add(reader.GetCharacterString(new Asn1Tag(UniversalTagNumber.GeneralString), KerberosTags.KerberosStringTag));
}
Name = names.ToArray();
break;
}
}
}
}
public KerberosError(ref AsnReader reader)
{
var tag = reader.ReadTagAndLength(out var contentLength, out var bytesRead);
reader = reader.AdvanceReader(bytesRead);
if (tag.TagClass != TagClass.Universal || tag.TagValue != (int)UniversalTagNumber.Sequence)
{
throw new InvalidOperationException("Not a sequence but " + tag);
}
while (reader.HasData)
{
tag = reader.ReadTagAndLength(out contentLength, out bytesRead);
reader = reader.AdvanceReader(bytesRead);
if (tag.TagClass == TagClass.ContextSpecific)
{
switch (tag.TagValue)
{
case 0:
// pvno [0] INTEGER (5),
ProtocolVersionNumber = (int)reader.GetInteger();
break;
case 1:
// msg-type [1] INTEGER (30),
MessageType = (MessageType)(int)reader.GetInteger();
break;
case 2:
// ctime [2] KerberosTime OPTIONAL,
CTime = reader.GetGeneralizedTime(disallowFractions: true);
break;
case 3:
// cusec [3] Microseconds OPTIONAL,
var cusec = reader.GetInteger();
CUsec = new Microseconds((int)cusec);
break;
case 4:
// stime [4] KerberosTime,
STime = reader.GetGeneralizedTime(disallowFractions: true);
break;
case 5:
// susec [5] Microseconds,
var susec = reader.GetInteger();
SUsec = new Microseconds((int)susec);
break;
case 6:
// error-code [6] Int32,
ErrorCode = (KrbErrorCode)(int)reader.GetInteger();
break;
case 7:
// crealm [7] Realm OPTIONAL,
CRealm = reader.GetCharacterString(new Asn1Tag(UniversalTagNumber.GeneralString), KerberosTags.RealmTag);
break;
case 8:
// cname [8] PrincipalName OPTIONAL,
CName = new PrincipalName(ref reader);
break;
case 9:
// realm [9] Realm -- service realm --,
ServiceRealm = reader.GetCharacterString(new Asn1Tag(UniversalTagNumber.GeneralString), KerberosTags.RealmTag);
break;
case 10:
// sname [10] PrincipalName -- service name --,
SName = new PrincipalName(ref reader);
break;
case 11:
// e-text [11] KerberosString OPTIONAL,
EText = reader.GetCharacterString(new Asn1Tag(UniversalTagNumber.GeneralString), KerberosTags.KerberosStringTag);
break;
case 12:
// e-data [12] OCTET STRING OPTIONAL
EData = new byte[contentLength.Value];
reader.TryCopyOctetStringBytes(EData, out _);
break;
}
}
}
}
