public Exceptional Deserialize(Byte[] mySerializedData, IIntegrityCheck myIntegrityCheckAlgorithm, ISymmetricEncryption myEncryptionAlgorithm, Boolean myIgnoreIntegrityCheckFailures)
{
#region Data
Byte[] IntegrityCheckValue;
int IntegrityCheckValue_Length;
Int64 IntegrityCheckValue_Position;
Byte[] actualIntegrityCheckValue;
Byte[] EncryptionParameters;
int EncryptionParameters_Length;
int DataPadding_Length;
int AdditionalPadding_Length = 0;
#endregion
#region Check if data is larger than the minimum allowed size
if (mySerializedData == null)
throw new GraphFSException_InvalidInformationHeader("The information header is invalid!");
if (mySerializedData.Length < 8)
throw new GraphFSException_InvalidInformationHeader("The information header is invalid!");
#endregion
try
{
#region Init reader
var _SerializationReader = new SerializationReader(mySerializedData);
#endregion
#region Read HeaderVersion
var _NewHeaderVersion = _SerializationReader.ReadByte();
#endregion
#region Read Length of the Integrity Check Value
// Multiply the value of the first byte with 8
IntegrityCheckValue_Length = _SerializationReader.ReadByte() << 3;
if (IntegrityCheckValue_Length > mySerializedData.Length - HeaderLength)
throw new GraphFSException_InvalidIntegrityCheckLengthField("The length of the integrity check value is invalid!");
// HACK: Remeber that a IntegrityCheckValue of 0 will circumvent the whole integrity checking!
if (myIntegrityCheckAlgorithm != null)
if ((IntegrityCheckValue_Length > 0) && (IntegrityCheckValue_Length != myIntegrityCheckAlgorithm.HashSize))
throw new GraphFSException_InvalidIntegrityCheckLengthField("The length of the integrity check value is " + IntegrityCheckValue_Length + ", but " + myIntegrityCheckAlgorithm.HashSize + " was expected!");
#endregion
#region Read Length of the Encryption Parameters
// Multiply the value of the second byte with 8
EncryptionParameters_Length = _SerializationReader.ReadByte() << 3;
if (EncryptionParameters_Length > mySerializedData.Length - HeaderLength - IntegrityCheckValue_Length)
throw new GraphFSException_InvalidEncryptionParametersLengthField("The length of the encryption parameters is invalid!");
#endregion
#region Read Padding lengths
DataPadding_Length = (Int32)_SerializationReader.ReadByte();
AdditionalPadding_Length = (Int32)(256 * _SerializationReader.ReadByte() + _SerializationReader.ReadByte()) << 3;
if ((HeaderLength + IntegrityCheckValue_Length + EncryptionParameters_Length + AdditionalPadding_Length) >= mySerializedData.Length)
throw new GraphFSException_InvalidAdditionalPaddingLengthField("The length of the additional padding is invalid!");
_SerializationReader.ReadBytesDirect(2); // Read reserved bytes
#endregion
#region Read Integrity Check Value and Encryption Parameters
IntegrityCheckValue_Position = _SerializationReader.BaseStream.Position;
if (IntegrityCheckValue_Length > 0)
IntegrityCheckValue = _SerializationReader.ReadBytesDirect(IntegrityCheckValue_Length);
if (EncryptionParameters_Length > 0)
EncryptionParameters = _SerializationReader.ReadBytesDirect(EncryptionParameters_Length);
#endregion
#region Verify the integrity of the data
if (myIntegrityCheckAlgorithm != null && IntegrityCheckValue_Length > 0)
{
// Save the read IntegrityCheckValue
IntegrityCheckValue = new Byte[IntegrityCheckValue_Length];
Array.Copy(mySerializedData, IntegrityCheckValue_Position, IntegrityCheckValue, 0, IntegrityCheckValue_Length);
// Zero the IntegrityCheckValue within the serialized data
Byte[] AllZeros = new Byte[IntegrityCheckValue_Length];
Array.Copy(AllZeros, 0, mySerializedData, IntegrityCheckValue_Position, IntegrityCheckValue_Length);
// Calculate the actual IntegrityCheckValue
actualIntegrityCheckValue = myIntegrityCheckAlgorithm.GetHashValueAsByteArray(mySerializedData);
// Compare read and actual IntegrityCheckValue
if (IntegrityCheckValue.CompareByteArray(actualIntegrityCheckValue) != 0 && myIgnoreIntegrityCheckFailures == false)
throw new GraphFSException_IntegrityCheckFailed(String.Concat("The IntegrityCheck failed as ", actualIntegrityCheckValue.ToHexString(), " is not equal to the expected ", IntegrityCheckValue.ToHexString()));
}
#endregion
#region Decrypt the remaining data
//EncryptedData_Length = (UInt64) (mySerializedData.Length - (HeaderLength + IntegrityCheckValue_Length + EncryptionParameters_Length + AdditionalPadding_Length));
//EncryptedData = new Byte[EncryptedData_Length];
//Array.Copy(mySerializedData, HeaderLength + IntegrityCheckValue_Length + EncryptionParameters_Length, EncryptedData, 0, (Int64) EncryptedData_Length);
//#endregion
//#region Decrypt Data
// Decrypt Data, sooon...!
//if ( (UInt64) DataPadding_Length >= EncryptedData_Length)
// throw new GraphFSException_InvalidDataPaddingLengthField("The length of the data padding is invalid!");
//DecryptedData = new Byte[EncryptedData_Length - (UInt64) DataPadding_Length];
//Array.Copy(EncryptedData, 0, DecryptedData, 0, (Int64) (EncryptedData_Length - (UInt64) DataPadding_Length));
#endregion
#region Deserialize Inner Object
_StructureVersion = BitConverter.ToUInt16(_SerializationReader.ReadBytesDirect(2), 0);
ObjectUUID = new ObjectUUID();
ObjectUUID.Deserialize(ref _SerializationReader); // n or at least 16 Bytes
Deserialize(ref _SerializationReader);
#endregion
}
catch (GraphFSException_IntegrityCheckFailed e)
{
throw new GraphFSException_IntegrityCheckFailed("The AGraphStructure could not be deserialized as its integrity is corrupted!\n\n" + e);
}
catch (Exception e)
{
throw new GraphFSException_AGraphStructureCouldNotBeDeserialized("The AGraphStructure could not be deserialized!\n\n" + e);
}
_SerializedAGraphStructure = mySerializedData;
return new Exceptional();
}