public bool DecryptRulePackage(out byte[] outputDecryptedRulePackageData, out byte[] outputEncryptedRulePackageDataWithSymmetricKey)
{
XmlNode encryptionNode = this.GetEncryptionNode();
if (encryptionNode == null)
{
outputDecryptedRulePackageData = null;
outputEncryptedRulePackageDataWithSymmetricKey = null;
return(false);
}
byte[] array = this.AsymmetricDecrypt(this.GetEncryptionParameter(encryptionNode, "ns:Key"));
byte[] array2 = this.AsymmetricDecrypt(this.GetEncryptionParameter(encryptionNode, "ns:IV"));
using (this.algorithm = new AesCryptoServiceProvider())
{
this.algorithm.Key = array;
this.algorithm.IV = array2;
this.DecryptEntities();
this.DecryptAffinities();
this.DecryptRegexes();
this.DecryptKeywordLists();
}
this.RemoveEncryptionNode();
outputDecryptedRulePackageData = XmlProcessingUtils.XmlDocumentToUtf16EncodedBytes(this.document);
outputEncryptedRulePackageDataWithSymmetricKey = this.ReplaceSymmetricAlgorithmParameters(array, array2);
return(true);
}
private byte[] ReplaceSymmetricAlgorithmParameters(byte[] symmetricKey, byte[] initializationVector)
{
XmlDocument xmlDocument = new XmlDocument();
XmlReader reader = XmlReader.Create(new MemoryStream(this.inputRulePackageData), ClassificationDefinitionUtils.CreateSafeXmlReaderSettings());
xmlDocument.Load(reader);
XmlNode xmlNode = RulePackageDecrypter.InternalRulePackageDecrypter.SelectAndEnsureSingleNode(xmlDocument, this.nsmgr, "/ns:RulePackage/ns:RulePack/ns:Encryption/ns:Key");
if (xmlNode == null)
{
throw new XmlException("Encryption key node not found");
}
xmlNode.InnerText = Convert.ToBase64String(symmetricKey);
XmlNode xmlNode2 = RulePackageDecrypter.InternalRulePackageDecrypter.SelectAndEnsureSingleNode(xmlDocument, this.nsmgr, "/ns:RulePackage/ns:RulePack/ns:Encryption/ns:IV");
if (xmlNode2 == null)
{
throw new XmlException("Encryption IV node not found");
}
xmlNode2.InnerText = Convert.ToBase64String(initializationVector);
return(XmlProcessingUtils.XmlDocumentToUtf16EncodedBytes(xmlDocument));
}
