Refactoring
Fixing CTR IV calc logic
This commit is contained in:
Dmitry Isaenko
parent
18bdd0f3eb
commit
842be7048d
2 changed files with 167 additions and 140 deletions
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@ -17,11 +17,11 @@ public class NCAContentPFS0 {
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public NCAContentPFS0(File file, long offsetPosition, NCASectionBlock ncaSectionBlock, NCAHeaderTableEntry ncaHeaderTableEntry, byte[] decryptedKey){
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SHA256hashes = new LinkedList<>();
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try {
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RandomAccessFile raf = new RandomAccessFile(file, "r");
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// If it's PFS0Provider
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if (ncaSectionBlock.getSuperBlockPFS0() != null){
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// IF NO ENCRYPTION
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if (ncaSectionBlock.getCryptoType() == 0x1) {
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RandomAccessFile raf = new RandomAccessFile(file, "r");
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long thisMediaLocation = offsetPosition + (ncaHeaderTableEntry.getMediaStartOffset() * 0x200);
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long hashTableLocation = thisMediaLocation + ncaSectionBlock.getSuperBlockPFS0().getHashTableOffset();
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long pfs0Location = thisMediaLocation + ncaSectionBlock.getSuperBlockPFS0().getPfs0offset();
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@ -42,77 +42,14 @@ public class NCAContentPFS0 {
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// Get pfs0
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pfs0 = new PFS0Provider(file, pfs0Location);
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}
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// If encrypted (regular) todo: check keys provided
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// If encrypted (regular)
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else if (ncaSectionBlock.getCryptoType() == 0x3){ // d0c1...
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if (decryptedKey == null)
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return; // TODO: FIX
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//--------------------------------------------------------------------------------------------------
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System.out.println("Media start location: " + ncaHeaderTableEntry.getMediaStartOffset());
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System.out.println("Media end location: " + ncaHeaderTableEntry.getMediaEndOffset());
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System.out.println("Media size : " + (ncaHeaderTableEntry.getMediaEndOffset()-ncaHeaderTableEntry.getMediaStartOffset()));
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System.out.println("Media act. location: " + (offsetPosition + (ncaHeaderTableEntry.getMediaStartOffset() * 0x200)));
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System.out.println("SHA256 hash tbl size: " + ncaSectionBlock.getSuperBlockPFS0().getHashTableSize());
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System.out.println("SHA256 hash tbl offs: " + ncaSectionBlock.getSuperBlockPFS0().getHashTableOffset());
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System.out.println("SHA256 records: " + (ncaSectionBlock.getSuperBlockPFS0().getHashTableSize() / 0x20));
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System.out.println("KEY: " + LoperConverter.byteArrToHexString(decryptedKey));
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System.out.println("CTR: " + LoperConverter.byteArrToHexString(ncaSectionBlock.getSectionCTR()));
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System.out.println("PFS0 Offs: " + ncaSectionBlock.getSuperBlockPFS0().getPfs0offset());
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System.out.println();
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//--------------------------------------------------------------------------------------------------
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long thisMediaLocation = offsetPosition + (ncaHeaderTableEntry.getMediaStartOffset() * 0x200); // According to real file
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long hashTableLocation = thisMediaLocation + ncaSectionBlock.getSuperBlockPFS0().getHashTableOffset(); // According to real file
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raf.seek(thisMediaLocation);
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try {
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// IV for CTR == 32 bytes
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byte[] IVarray = new byte[0x10];
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// Populate first 8 bytes taken from Header's section Block CTR
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System.arraycopy(LoperConverter.flip(ncaSectionBlock.getSectionCTR()), 0x0, IVarray,0x0, 0x8);
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// Populate last 8 bytes calculated. Thanks hactool project!
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// TODO: here is too much magic. It MUST be clarified and simplified
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long mediaStrtOffReal = ncaHeaderTableEntry.getMediaStartOffset() * 0x200; // NOTE: long actually should be unsigned.. for calculation it's not critical, but for representation it is
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mediaStrtOffReal >>= 4;
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for (int i = 0; i < 0x8; i++){
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IVarray[0x10-i-1] = (byte)(mediaStrtOffReal & 0xff); // Note: issues could be here
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mediaStrtOffReal >>= 8;
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}
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AesCtr aesCtr = new AesCtr(decryptedKey, IVarray);
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byte[] encryptedBlock;
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byte[] dectyptedBlock;
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long mediaBlockSize = ncaHeaderTableEntry.getMediaEndOffset() - ncaHeaderTableEntry.getMediaStartOffset();
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// Prepare thread to parse encrypted data
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PipedOutputStream streamOut = new PipedOutputStream();
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PipedInputStream streamInp = new PipedInputStream(streamOut);
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new Thread(new ParseEncrypted(
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SHA256hashes,
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streamInp,
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ncaSectionBlock.getSuperBlockPFS0().getPfs0offset(),
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ncaSectionBlock.getSuperBlockPFS0().getPfs0size(),
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ncaSectionBlock.getSuperBlockPFS0().getHashTableOffset(),
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ncaSectionBlock.getSuperBlockPFS0().getHashTableSize()
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)).start();
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// Decrypt data
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for (int i = 0; i < mediaBlockSize; i++){
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encryptedBlock = new byte[0x200];
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if (raf.read(encryptedBlock) != -1){
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dectyptedBlock = aesCtr.decrypt(encryptedBlock);
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// Writing decrypted data to pipe
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streamOut.write(dectyptedBlock);
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}
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}
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streamOut.flush();
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}
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catch (Exception e){
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e.printStackTrace();
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}
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raf.close();
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new CryptoSection03(file,
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offsetPosition,
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decryptedKey,
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ncaSectionBlock,
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ncaHeaderTableEntry.getMediaStartOffset(),
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ncaHeaderTableEntry.getMediaEndOffset());
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}
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}
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else if (ncaSectionBlock.getSuperBlockIVFC() != null){
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@ -130,82 +67,171 @@ public class NCAContentPFS0 {
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public LinkedList<byte[]> getSHA256hashes() { return SHA256hashes; }
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public PFS0Provider getPfs0() { return pfs0; }
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private class CryptoSection03{
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private class ParseEncrypted implements Runnable{
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CryptoSection03(File file, long offsetPosition, byte[] decryptedKey, NCASectionBlock ncaSectionBlock, long mediaStartOffset, long mediaEndOffset) throws Exception{
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//--------------------------------------------------------------------------------------------------
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System.out.println("Media start location: " + mediaStartOffset);
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System.out.println("Media end location: " + mediaEndOffset);
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System.out.println("Media size : " + (mediaEndOffset-mediaStartOffset));
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System.out.println("Media act. location: " + (offsetPosition + (mediaStartOffset * 0x200)));
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System.out.println("SHA256 hash tbl size: " + ncaSectionBlock.getSuperBlockPFS0().getHashTableSize());
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System.out.println("SHA256 hash tbl offs: " + ncaSectionBlock.getSuperBlockPFS0().getHashTableOffset());
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System.out.println("PFS0 Offs: " + ncaSectionBlock.getSuperBlockPFS0().getPfs0offset());
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System.out.println("SHA256 records: " + (ncaSectionBlock.getSuperBlockPFS0().getHashTableSize() / 0x20));
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System.out.println("KEY: " + LoperConverter.byteArrToHexString(decryptedKey));
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System.out.println("CTR: " + LoperConverter.byteArrToHexString(ncaSectionBlock.getSectionCTR()));
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System.out.println();
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//--------------------------------------------------------------------------------------------------
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LinkedList<byte[]> SHA256hashes;
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PipedInputStream pipedInputStream;
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if (decryptedKey == null)
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throw new Exception("CryptoSection03: unable to proceed. No Key Area Encryption Keys provided.");
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long hashTableOffset;
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long hashTableSize;
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long hashTableRecordsCount;
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long pfs0offset;
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long pfs0size;
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RandomAccessFile raf = new RandomAccessFile(file, "r");
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raf.seek(offsetPosition + (mediaStartOffset * 0x200));
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ParseEncrypted(LinkedList<byte[]> SHA256hashes, PipedInputStream pipedInputStream, long pfs0offset, long pfs0size, long hashTableOffset, long hashTableSize){
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this.SHA256hashes = SHA256hashes;
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this.pipedInputStream = pipedInputStream;
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this.hashTableOffset = hashTableOffset;
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this.hashTableSize = hashTableSize;
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this.hashTableRecordsCount = hashTableSize / 0x20;
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this.pfs0offset = pfs0offset;
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this.pfs0size = pfs0size;
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}
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AesCtrDecryptor decryptor = new AesCtrDecryptor(decryptedKey, ncaSectionBlock.getSectionCTR(), mediaStartOffset * 0x200);
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@Override
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public void run() {
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long counter = 0; // How many bytes already read
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byte[] encryptedBlock;
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byte[] dectyptedBlock;
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long mediaBlockSize = mediaEndOffset - mediaStartOffset;
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// Prepare thread to parse encrypted data
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PipedOutputStream streamOut = new PipedOutputStream();
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PipedInputStream streamInp = new PipedInputStream(streamOut);
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try{
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if (hashTableOffset > 0){
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while (counter < hashTableOffset) {
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pipedInputStream.read(); // todo: .skip()
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counter++;
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}
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new Thread(new ParseThread(
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streamInp,
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ncaSectionBlock.getSuperBlockPFS0().getPfs0offset(),
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ncaSectionBlock.getSuperBlockPFS0().getPfs0size(),
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ncaSectionBlock.getSuperBlockPFS0().getHashTableOffset(),
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ncaSectionBlock.getSuperBlockPFS0().getHashTableSize()
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)).start();
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// Decrypt data
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for (int i = 0; i < mediaBlockSize; i++){
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encryptedBlock = new byte[0x200];
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if (raf.read(encryptedBlock) != -1){
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//dectyptedBlock = aesCtr.decrypt(encryptedBlock);
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dectyptedBlock = decryptor.dectyptNext(encryptedBlock);
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// Writing decrypted data to pipe
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streamOut.write(dectyptedBlock);
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}
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// Main loop
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while (true){
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// Loop for collecting all recrods from sha256 hash table
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while ((counter - hashTableOffset) < hashTableSize){
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int hashCounter = 0;
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byte[] sectionHash = new byte[0x20];
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// Loop for collecting bytes for every SINGLE records, where record size == 0x20
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while (hashCounter < 0x20){
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}
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streamOut.flush();
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streamOut.close();
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raf.close();
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}
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/*
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* Simplify decryption of the CTR
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* */
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private class AesCtrDecryptor{
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private long realMediaOffset;
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byte[] IVarray;
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private AesCtr aesCtr;
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AesCtrDecryptor(byte[] decryptedKey, byte[] sectionCTR, long realMediaOffset) throws Exception{
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this.realMediaOffset = realMediaOffset;
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aesCtr = new AesCtr(decryptedKey);
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// IV for CTR == 16 bytes
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IVarray = new byte[0x10];
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// Populate first 8 bytes taken from Header's section Block CTR
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System.arraycopy(LoperConverter.flip(sectionCTR), 0x0, IVarray,0x0, 0x8);
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}
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public byte[] dectyptNext(byte[] enctyptedBlock) throws Exception{
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updateIV(realMediaOffset);
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byte[] decryptedBlock = aesCtr.decrypt(enctyptedBlock, IVarray);
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realMediaOffset += 0x200;
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return decryptedBlock;
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}
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// Populate last 8 bytes calculated. Thanks hactool project!
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private void updateIV(long offset){
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offset >>= 4;
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for (int i = 0; i < 0x8; i++){
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IVarray[0x10-i-1] = (byte)(offset & 0xff); // Note: issues could be here
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offset >>= 8;
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}
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}
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}
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/*
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* Since we representing decrypted data as stream (it's easier to look on it this way),
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* this thread will be parsing it.
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* */
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private class ParseThread implements Runnable{
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PipedInputStream pipedInputStream;
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long hashTableOffset;
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long hashTableSize;
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long hashTableRecordsCount;
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long pfs0offset;
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long pfs0size;
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ParseThread(PipedInputStream pipedInputStream, long pfs0offset, long pfs0size, long hashTableOffset, long hashTableSize){
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this.pipedInputStream = pipedInputStream;
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this.hashTableOffset = hashTableOffset;
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this.hashTableSize = hashTableSize;
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this.hashTableRecordsCount = hashTableSize / 0x20;
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this.pfs0offset = pfs0offset;
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this.pfs0size = pfs0size;
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}
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@Override
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public void run() {
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long counter = 0; // How many bytes already read
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try{
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if (hashTableOffset > 0){
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if (hashTableOffset != pipedInputStream.skip(hashTableOffset))
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return; // TODO: fix?
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counter = hashTableOffset;
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}
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// Main loop
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while (true){
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// Loop for collecting all recrods from sha256 hash table
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while ((counter - hashTableOffset) < hashTableSize){
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int hashCounter = 0;
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byte[] sectionHash = new byte[0x20];
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// Loop for collecting bytes for every SINGLE records, where record size == 0x20
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while (hashCounter < 0x20){
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int currentByte = pipedInputStream.read();
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if (currentByte == -1)
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break;
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sectionHash[hashCounter] = (byte)currentByte;
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hashCounter++;
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counter++;
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}
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// Write after collecting
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SHA256hashes.add(sectionHash); // From the NCAContentProvider obviously
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}
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// Skip padding and go to PFS0 location
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if (counter < pfs0offset){
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if ((pfs0offset-counter) != pipedInputStream.skip(pfs0offset-counter))
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return; // TODO: fix?
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counter += pfs0offset-counter;
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}
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//---------------------------------------------------------
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byte[] magic = new byte[0x4];
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for (int i = 0; i < 4; i++){
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int currentByte = pipedInputStream.read();
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if (currentByte == -1)
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break;
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sectionHash[hashCounter] = (byte)currentByte;
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hashCounter++;
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counter++;
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magic[i] = (byte)currentByte;
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}
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// Write after collecting
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SHA256hashes.add(sectionHash);
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RainbowHexDump.hexDumpUTF8(magic);
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while (pipedInputStream.read() != -1)
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;
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break;
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}
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// Skip padding and go to PFS0 location
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if (counter < pfs0offset){
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while (counter < pfs0offset){
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pipedInputStream.read();
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counter++;
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}
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}
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//---------------------------------------------------------
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byte[] magic = new byte[0x4];
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for (int i = 0; i < 4; i++){
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int currentByte = pipedInputStream.read();
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if (currentByte == -1)
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break;
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magic[i] = (byte)currentByte;
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}
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RainbowHexDump.hexDumpUTF8(magic);
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break;
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}
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}
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catch (IOException ioe){
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System.out.println("'ParseEncrypted' thread exception");
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ioe.printStackTrace();
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}
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finally {
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System.out.println("Thread died.");
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catch (IOException ioe){
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System.out.println("'ParseThread' thread exception");
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ioe.printStackTrace();
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}
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finally {
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System.out.println("ParseThread thread died.");
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}
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}
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}
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}
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@ -17,18 +17,19 @@ public class AesCtr {
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}
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private Cipher cipher;
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private SecretKeySpec key;
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public AesCtr(byte[] keyArray, byte[] IVarray) throws Exception{
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public AesCtr(byte[] keyArray) throws Exception{
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if ( ! BCinitialized)
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initBCProvider();
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IvParameterSpec iv = new IvParameterSpec(IVarray);
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SecretKeySpec key = new SecretKeySpec(keyArray, "AES");
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key = new SecretKeySpec(keyArray, "AES");
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cipher = Cipher.getInstance("AES/CTR/NoPadding", "BC");
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cipher.init(Cipher.DECRYPT_MODE, key, iv);
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}
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public byte[] decrypt(byte[] encryptedData) throws Exception{
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public byte[] decrypt(byte[] encryptedData, byte[] IVarray) throws Exception{
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IvParameterSpec iv = new IvParameterSpec(IVarray);
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cipher.init(Cipher.DECRYPT_MODE, key, iv);
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return cipher.doFinal(encryptedData);
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}
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}
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