protected override void Decode ()
{
ASN1 bitString = new ASN1 (extnValue.Value);
if (bitString.Tag != 0x03)
throw new ArgumentException ("Invalid NetscapeCertType extension");
int i = 1; // byte zero has the number of unused bits (ASN1's BITSTRING)
while (i < bitString.Value.Length)
ctbits = (ctbits << 8) + bitString.Value [i++];
}