private void EnsureFileFormatVersion()
{
VersionHeaderBlock versionHeaderBlock = FindHeaderBlock <VersionHeaderBlock>();
if (versionHeaderBlock.FileVersionMajor > 3)
{
throw new FileFormatException("Too new file format.", ErrorStatus.TooNewFileFormatVersion);
}
}
public static void TestVersionValues()
{
VersionHeaderBlock versionHeaderBlock = new VersionHeaderBlock();
Assert.That(versionHeaderBlock.FileVersionMajor, Is.EqualTo(3), "This is the current default version number");
Assert.That(versionHeaderBlock.FileVersionMinor, Is.EqualTo(2), "This is the current default version number");
Assert.That(versionHeaderBlock.VersionMajor, Is.EqualTo(2), "This is the current default version number");
Assert.That(versionHeaderBlock.VersionMinor, Is.EqualTo(0), "This is the current default version number");
Assert.That(versionHeaderBlock.VersionMinuscule, Is.EqualTo(0), "This is the current default version number");
}
private AesKey GetMasterKey()
{
KeyWrap1HeaderBlock keyHeaderBlock = FindHeaderBlock <KeyWrap1HeaderBlock>();
VersionHeaderBlock versionHeaderBlock = FindHeaderBlock <VersionHeaderBlock>();
byte[] unwrappedKeyData = keyHeaderBlock.UnwrapMasterKey(_keyEncryptingKey, versionHeaderBlock.FileVersionMajor);
if (unwrappedKeyData.Length == 0)
{
return(null);
}
return(new AesKey(unwrappedKeyData));
}
public override object Clone()
{
VersionHeaderBlock block = new VersionHeaderBlock((byte[])GetDataBlockBytesReference().Clone());
return(block);
}
public override object Clone()
{
VersionHeaderBlock block = new VersionHeaderBlock((byte[])GetDataBlockBytesReference().Clone());
return block;
}
private void ParseHeaderBlock(HeaderBlockType headerBlockType, byte[] dataBlock)
{
bool isFirst = CurrentItemType == AxCryptItemType.MagicGuid;
CurrentItemType = AxCryptItemType.HeaderBlock;
if (headerBlockType == HeaderBlockType.Preamble)
{
if (!isFirst)
{
throw new FileFormatException("Preamble can only be first.", ErrorStatus.FileFormatError);
}
CurrentHeaderBlock = new PreambleHeaderBlock(dataBlock);
_sendDataToHmacStream = true;
return;
}
else
{
if (isFirst)
{
throw new FileFormatException("Preamble must be first.", ErrorStatus.FileFormatError);
}
}
switch (headerBlockType)
{
case HeaderBlockType.Version:
CurrentHeaderBlock = new VersionHeaderBlock(dataBlock);
break;
case HeaderBlockType.KeyWrap1:
CurrentHeaderBlock = new KeyWrap1HeaderBlock(dataBlock);
break;
case HeaderBlockType.KeyWrap2:
CurrentHeaderBlock = new KeyWrap2HeaderBlock(dataBlock);
break;
case HeaderBlockType.IdTag:
CurrentHeaderBlock = new IdTagHeaderBlock(dataBlock);
break;
case HeaderBlockType.Data:
CurrentHeaderBlock = new DataHeaderBlock(dataBlock);
break;
case HeaderBlockType.FileNameInfo:
CurrentHeaderBlock = new FileNameInfoHeaderBlock(dataBlock);
break;
case HeaderBlockType.EncryptionInfo:
CurrentHeaderBlock = new EncryptionInfoHeaderBlock(dataBlock);
break;
case HeaderBlockType.CompressionInfo:
CurrentHeaderBlock = new CompressionInfoHeaderBlock(dataBlock);
break;
case HeaderBlockType.FileInfo:
CurrentHeaderBlock = new FileInfoHeaderBlock(dataBlock);
break;
case HeaderBlockType.Compression:
CurrentHeaderBlock = new CompressionHeaderBlock(dataBlock);
break;
case HeaderBlockType.UnicodeFileNameInfo:
CurrentHeaderBlock = new UnicodeFileNameInfoHeaderBlock(dataBlock);
break;
case HeaderBlockType.Encrypted:
case HeaderBlockType.None:
case HeaderBlockType.Any:
throw new FileFormatException("Illegal header block type.", ErrorStatus.FileFormatError);
default:
CurrentHeaderBlock = new UnrecognizedHeaderBlock(headerBlockType, dataBlock);
break;
}
if (_sendDataToHmacStream)
{
CurrentHeaderBlock.Write(_hmacBufferStream);
}
return;
}
private void ParseHeaderBlock(HeaderBlockType headerBlockType, byte[] dataBlock)
{
bool isFirst = CurrentItemType == AxCryptItemType.MagicGuid;
CurrentItemType = AxCryptItemType.HeaderBlock;
if (headerBlockType == HeaderBlockType.Preamble)
{
if (!isFirst)
{
throw new FileFormatException("Preamble can only be first.", ErrorStatus.FileFormatError);
}
CurrentHeaderBlock = new PreambleHeaderBlock(dataBlock);
_sendDataToHmacStream = true;
return;
}
else
{
if (isFirst)
{
throw new FileFormatException("Preamble must be first.", ErrorStatus.FileFormatError);
}
}
switch (headerBlockType)
{
case HeaderBlockType.Version:
CurrentHeaderBlock = new VersionHeaderBlock(dataBlock);
break;
case HeaderBlockType.KeyWrap1:
CurrentHeaderBlock = new KeyWrap1HeaderBlock(dataBlock);
break;
case HeaderBlockType.KeyWrap2:
CurrentHeaderBlock = new KeyWrap2HeaderBlock(dataBlock);
break;
case HeaderBlockType.IdTag:
CurrentHeaderBlock = new IdTagHeaderBlock(dataBlock);
break;
case HeaderBlockType.Data:
CurrentHeaderBlock = new DataHeaderBlock(dataBlock);
break;
case HeaderBlockType.FileNameInfo:
CurrentHeaderBlock = new FileNameInfoHeaderBlock(dataBlock);
break;
case HeaderBlockType.EncryptionInfo:
CurrentHeaderBlock = new EncryptionInfoHeaderBlock(dataBlock);
break;
case HeaderBlockType.CompressionInfo:
CurrentHeaderBlock = new CompressionInfoHeaderBlock(dataBlock);
break;
case HeaderBlockType.FileInfo:
CurrentHeaderBlock = new FileInfoHeaderBlock(dataBlock);
break;
case HeaderBlockType.Compression:
CurrentHeaderBlock = new CompressionHeaderBlock(dataBlock);
break;
case HeaderBlockType.UnicodeFileNameInfo:
CurrentHeaderBlock = new UnicodeFileNameInfoHeaderBlock(dataBlock);
break;
case HeaderBlockType.Encrypted:
case HeaderBlockType.None:
case HeaderBlockType.Any:
throw new FileFormatException("Illegal header block type.", ErrorStatus.FileFormatError);
default:
CurrentHeaderBlock = new UnrecognizedHeaderBlock(headerBlockType, dataBlock);
break;
}
if (_sendDataToHmacStream)
{
CurrentHeaderBlock.Write(_hmacBufferStream);
}
return;
}
public void TestFindPreambleHeaderBlockNotFirstShouldThrow()
{
using (MemoryStream testStream = new MemoryStream())
{
AxCrypt1Guid.Write(testStream);
VersionHeaderBlock versionHeaderBlock = new VersionHeaderBlock();
versionHeaderBlock.Write(testStream);
PreambleHeaderBlock preambleHeaderBlock = new PreambleHeaderBlock();
preambleHeaderBlock.Write(testStream);
testStream.Position = 0;
using (AxCryptReader axCryptReader = AxCryptReader.Create(testStream))
{
Assert.That(axCryptReader.Read(), Is.True, "We should be able to read the Guid");
Assert.That(axCryptReader.CurrentItemType, Is.EqualTo(AxCryptItemType.MagicGuid), "We're expecting to have found a MagicGuid");
Assert.Throws<FileFormatException>(() => axCryptReader.Read());
}
}
}
public void SetCurrentVersion()
{
VersionHeaderBlock versionHeaderBlock = FindHeaderBlock <VersionHeaderBlock>();
versionHeaderBlock.SetCurrentVersion();
}