private void Decode()
{
if (_decoded)
{
return;
}
// AuthorityKeyIdentifier ::= SEQUENCE {
// keyIdentifier [0] KeyIdentifier OPTIONAL,
// authorityCertIssuer [1] GeneralNames OPTIONAL,
// authorityCertSerialNumber [2] CertificateSerialNumber OPTIONAL }
//
// KeyIdentifier ::= OCTET STRING
string keyId = null;
X500DistinguishedName firstIssuerName = null;
DerSequenceReader reader = new DerSequenceReader(RawData);
byte[] serialNumber = null;
// Primitive Context 0
const byte KeyIdTag = DerSequenceReader.ContextSpecificTagFlag | 0;
// Constructed Context 1
const byte CertIssuerTag = DerSequenceReader.ContextSpecificConstructedTag1;
// Primitive Context 2
const byte CertSerialTag = DerSequenceReader.ContextSpecificTagFlag | 2;
if (reader.HasTag(KeyIdTag))
{
keyId = reader.ReadOctetString().ToHexStringUpper();
}
if (reader.HasTag(CertIssuerTag))
{
DerSequenceReader generalNames = reader.ReadSequence();
while (generalNames.HasData)
{
const byte DirectoryNameTag = DerSequenceReader.ConstructedFlag |
(byte)GeneralNameEncoder.GeneralNameTag.DirectoryName;
if (firstIssuerName == null && generalNames.HasTag(DirectoryNameTag))
{
firstIssuerName = new X500DistinguishedName(generalNames.ReadNextEncodedValue());
}
reader.ValidateAndSkipDerValue();
}
}
if (reader.HasTag(CertSerialTag))
{
serialNumber = reader.ReadOctetString();
}
if (reader.HasData)
{
throw new CryptographicException(SR.Cryptography_Der_Invalid_Encoding);
}
_firstIssuerName = firstIssuerName;
_serialNumber = serialNumber;
_keyIdentifier = keyId;
_decoded = true;
}
