private void DecryptAsResponse(byte[] key)
{
var encryptType = (EncryptionType)Response.enc_part.etype.Value;
int keyUsage = (int)KeyUsageNumber.AS_REP_ENCRYPTEDPART;
if (encryptType == EncryptionType.RC4_HMAC)
{
keyUsage = (int)KeyUsageNumber.TGS_REP_encrypted_part;
}
var encPartRawData = KerberosUtility.Decrypt(
encryptType,
key,
Response.enc_part.cipher.ByteArrayValue,
keyUsage);
Asn1DecodingBuffer buf = new Asn1DecodingBuffer(encPartRawData);
Asn1Tag tag = null;
Asn1StandardProcedure.TagBerDecode(buf, out tag);
//Some implementations unconditionally send an encrypted EncTGSRepPart in the field
//regardless of whether the reply is an AS-REP or a TGS-REP.([RFC4120] Section 5.4.2)
if (tag.TagValue == 25) //EncAsRepPart
{
EncPart = new EncASRepPart();
}
else if (tag.TagValue == 26) //EncTgsRepPart
{
EncPart = new EncTGSRepPart();
}
else
{
throw new Exception("Unknown tag number");
}
EncPart.BerDecode(new Asn1DecodingBuffer(encPartRawData));
KerberosUtility.OnDumpMessage("KRB5:AS-REP(enc-part)",
"Encrypted part of AS-REP",
KerberosUtility.DumpLevel.PartialMessage,
encPartRawData);
}
private void DecryptAsResponse(byte[] key)
{
var encryptType = (EncryptionType)Response.enc_part.etype.Value;
int keyUsage = (int)KeyUsageNumber.AS_REP_ENCRYPTEDPART;
if (encryptType == EncryptionType.RC4_HMAC)
keyUsage = (int)KeyUsageNumber.TGS_REP_encrypted_part;
var encPartRawData = KerberosUtility.Decrypt(
encryptType,
key,
Response.enc_part.cipher.ByteArrayValue,
keyUsage);
Asn1DecodingBuffer buf = new Asn1DecodingBuffer(encPartRawData);
Asn1Tag tag = null;
Asn1StandardProcedure.TagBerDecode(buf, out tag);
//Some implementations unconditionally send an encrypted EncTGSRepPart in the field
//regardless of whether the reply is an AS-REP or a TGS-REP.([RFC4120] Section 5.4.2)
if (tag.TagValue == 25) //EncAsRepPart
{
EncPart = new EncASRepPart();
}
else if (tag.TagValue == 26) //EncTgsRepPart
{
EncPart = new EncTGSRepPart();
}
else
{
throw new Exception("Unknown tag number");
}
EncPart.BerDecode(new Asn1DecodingBuffer(encPartRawData));
KerberosUtility.OnDumpMessage("KRB5:AS-REP(enc-part)",
"Encrypted part of AS-REP",
KerberosUtility.DumpLevel.PartialMessage,
encPartRawData);
}