private void CheckAlg(bool decode)
{
AlgorithmId algorithmId = null;
foreach (var alg in PkiConstants.SupportedAlgorithms)
{
if (alg.Id.Equals(Algorithm))
{
algorithmId = alg;
break;
}
}
if ((algorithmId != null) && ((decode && (Parameters != null)) && (algorithmId.Type != null)))
{
try
{
var buffer = new Asn1BerDecodeBuffer(((Asn1OpenType)Parameters).Value);
Parameters = (Asn1Type)Activator.CreateInstance(algorithmId.Type.GetType());
Parameters.Decode(buffer, true, 0);
buffer.InvokeEndElement("parameters", -1);
}
catch (Exception exception)
{
Asn1Util.WriteStackTrace(exception, Console.Error);
throw ExceptionUtility.CryptographicException(Resources.Asn1TableConstraint);
}
}
}
public override void Decode(Asn1BerDecodeBuffer buffer, bool explicitTagging, int implicitLength)
{
var elemLength = explicitTagging ? MatchTag(buffer, Asn1Tag.Sequence) : implicitLength;
Algorithm = null;
Parameters = null;
var context = new Asn1BerDecodeContext(buffer, elemLength);
var parsedLen = new IntHolder();
if (!context.MatchElemTag(0, 0, ObjectIdentifierTypeCode, parsedLen, false))
{
throw ExceptionUtility.CryptographicException(Resources.Asn1MissingRequiredException, buffer.ByteCount);
}
Algorithm = new Asn1ObjectIdentifier();
Algorithm.Decode(buffer, true, parsedLen.Value);
if (!context.Expired())
{
Parameters = new Asn1OpenType();
Parameters.Decode(buffer, true, 0);
}
CheckAlg(true);
}
public override void Decode
(Asn1BerDecodeBuffer buffer, bool explicitTagging, int implicitLength)
{
int llen = (explicitTagging) ?
MatchTag(buffer, Asn1Tag.Sequence) : implicitLength;
Init();
// decode SEQUENCE
Asn1BerDecodeContext context =
new Asn1BerDecodeContext(buffer, llen);
IntHolder elemLen = new IntHolder();
// decode algorithm
if (context.MatchElemTag(Asn1Tag.Universal, Asn1Tag.PRIM, 6, elemLen, false))
{
algorithm = new Asn1ObjectIdentifier();
algorithm.Decode(buffer, true, elemLen.Value);
}
else
{
throw new Exception("Asn1MissingRequiredException (buffer)");
}
// decode parameters
if (!context.Expired())
{
parameters = new Asn1OpenType();
parameters.Decode(buffer, true, 0);
}
checkTC(true);
}
public void checkTC(bool decode)
{
/* check algorithm */
ALGORITHM_ID _index = null;
for (int i = 0; i < _PKIX1Explicit88Values.SupportedAlgorithms.Length; i++)
{
if (_PKIX1Explicit88Values.SupportedAlgorithms[i].id.Equals(algorithm))
{
_index = _PKIX1Explicit88Values.SupportedAlgorithms[i];
break;
}
}
if (null == _index)
{
return;
}
/* check parameters */
if (decode)
{
if (parameters != null && _index.Type != null)
{
try {
Asn1BerDecodeBuffer buffer = new Asn1BerDecodeBuffer(((Asn1OpenType)parameters).Value);
parameters = (Asn1Type)System.Activator.CreateInstance(_index.Type.GetType());
parameters.Decode(buffer, Asn1Tag.EXPL, 0);
buffer.InvokeEndElement("parameters", -1);
}
catch (Exception e) {
//Asn1Util.WriteStackTrace(e, Console.Error);
//throw new Exception("Asn1Exception(table constraint: parameters decode failed)");
throw e;
}
}
}
}
