public byte[] GetBytes(FileStream isoStream, long volumeOffset,
long dataOffset, long blockOffset, long size, byte[] partitionKey)
{
byte[] value = new byte[size];
byte[] encryptedPartitionCluster;
byte[] encryptedClusterDataSection;
byte[] decryptedClusterDataSection;
byte[] clusterIV;
long bufferLocation = 0;
long maxCopySize;
long copySize;
while (size > 0)
{
// get block offset info
NintendoWiiOpticalDisc.WiiBlockStructure blockStructure =
NintendoWiiOpticalDisc.GetWiiBlockStructureForOffset(blockOffset);
// read current block
//encryptedPartitionCluster = ParseFile.ParseSimpleOffset(isoStream,
// volumeOffset + dataOffset + (blockStructure.BlockNumber * 0x8000),
// 0x8000);
if (this.CurrentDecryptedBlockNumber != blockStructure.BlockNumber)
{
encryptedPartitionCluster = ParseFile.ParseSimpleOffset(isoStream,
volumeOffset + dataOffset + (blockStructure.BlockNumber * 0x8000),
0x8000);
clusterIV = ParseFile.ParseSimpleOffset(encryptedPartitionCluster, 0x03D0, 0x10);
encryptedClusterDataSection = ParseFile.ParseSimpleOffset(encryptedPartitionCluster, 0x400, 0x7C00);
decryptedClusterDataSection = AESEngine.Decrypt(this.Algorithm, encryptedClusterDataSection,
partitionKey, clusterIV, CipherMode.CBC, PaddingMode.Zeros);
this.CurrentDecryptedBlock = decryptedClusterDataSection;
this.CurrentDecryptedBlockNumber = blockStructure.BlockNumber;
}
// copy the decrypted data
maxCopySize = 0x7C00 - blockStructure.BlockOffset;
copySize = (size > maxCopySize) ? maxCopySize : size;
Array.Copy(this.CurrentDecryptedBlock, blockStructure.BlockOffset,
value, bufferLocation, copySize);
// update counters
size -= copySize;
bufferLocation += copySize;
blockOffset += copySize;
}
return(value);
}
public void ExtractFile(FileStream isoStream, string destinationPath, long volumeOffset,
long dataOffset, long blockOffset, long size, byte[] partitionKey)
{
byte[] value = new byte[0x7C00];
byte[] encryptedPartitionCluster;
byte[] encryptedClusterDataSection;
byte[] decryptedClusterDataSection;
byte[] clusterIV;
long maxCopySize;
long copySize;
// create destination
string destintionDirectory = Path.GetDirectoryName(destinationPath);
if (!Directory.Exists(destintionDirectory))
{
Directory.CreateDirectory(destintionDirectory);
}
using (FileStream outStream = File.Open(destinationPath, FileMode.Create, FileAccess.Write))
{
while (size > 0)
{
try
{
// get block offset info
NintendoWiiOpticalDisc.WiiBlockStructure blockStructure =
NintendoWiiOpticalDisc.GetWiiBlockStructureForOffset(blockOffset);
// read current block
//encryptedPartitionCluster = ParseFile.ParseSimpleOffset(isoStream,
// volumeOffset + dataOffset + (blockStructure.BlockNumber * 0x8000),
// 0x8000);
if (this.CurrentDecryptedBlockNumber != blockStructure.BlockNumber)
{
encryptedPartitionCluster = ParseFile.ParseSimpleOffset(isoStream,
volumeOffset + dataOffset + (blockStructure.BlockNumber * 0x8000),
0x8000);
if (encryptedPartitionCluster.Length == 0)
{
throw new Exception(String.Format("Encrypted cluster 0x{0) has size zero. This image is probably corrupt.", blockStructure.BlockNumber.ToString("X8")));
}
else
{
clusterIV = ParseFile.ParseSimpleOffset(encryptedPartitionCluster, 0x03D0, 0x10);
encryptedClusterDataSection = ParseFile.ParseSimpleOffset(encryptedPartitionCluster, 0x400, 0x7C00);
decryptedClusterDataSection = AESEngine.Decrypt(this.Algorithm, encryptedClusterDataSection,
partitionKey, clusterIV, CipherMode.CBC, PaddingMode.Zeros);
this.CurrentDecryptedBlock = decryptedClusterDataSection;
this.CurrentDecryptedBlockNumber = blockStructure.BlockNumber;
}
}
// copy the encrypted data
maxCopySize = 0x7C00 - blockStructure.BlockOffset;
copySize = (size > maxCopySize) ? maxCopySize : size;
outStream.Write(this.CurrentDecryptedBlock, (int)blockStructure.BlockOffset, (int)copySize);
// update counters
size -= copySize;
blockOffset += copySize;
}
catch (Exception ie)
{
throw ie;
}
}
}
}
