118 lines
4.5 KiB
Java
118 lines
4.5 KiB
Java
/*
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Copyright 2019-2022 Dmitry Isaenko
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This file is part of libKonogonka.
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libKonogonka is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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libKonogonka is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with libKonogonka. If not, see <https://www.gnu.org/licenses/>.
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*/
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package libKonogonka.Tools.other.System2;
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import libKonogonka.KeyChainHolder;
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import libKonogonka.Tools.ExportAble;
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import libKonogonka.Tools.other.System2.ini1.Ini1Provider;
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import libKonogonka.ctraesclassic.AesCtrClassicBufferedInputStream;
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import libKonogonka.ctraesclassic.AesCtrDecryptClassic;
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import libKonogonka.ctraesclassic.AesCtrStream;
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import javax.crypto.CipherInputStream;
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import java.io.*;
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import java.nio.ByteBuffer;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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public class System2Provider extends ExportAble {
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private byte[] rsa2048signature;
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private System2Header header;
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private KernelMap kernelMap;
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private Ini1Provider ini1Provider;
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private final String pathToFile;
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private final KeyChainHolder keyChainHolder;
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public System2Provider(String pathToFile, KeyChainHolder keyChainHolder) throws Exception{
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this.pathToFile = pathToFile;
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this.keyChainHolder = keyChainHolder;
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this.stream = new BufferedInputStream(Files.newInputStream(Paths.get(pathToFile)));
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readSignatures();
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readHeader();
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findIni1KernelMap();
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this.stream.close();
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}
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private void readSignatures() throws Exception{
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rsa2048signature = new byte[0x100];
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if (0x100 != stream.read(rsa2048signature))
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throw new Exception("Unable to read System2 RSA-2048 signature bytes");
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}
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private void readHeader() throws Exception{
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byte[] headerBytes = new byte[0x100];
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if (0x100 != stream.read(headerBytes))
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throw new Exception("Unable to read System2 header bytes");
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this.header = new System2Header(headerBytes, keyChainHolder.getRawKeySet());
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}
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private void findIni1KernelMap() throws Exception{
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try (InputStream fis = Files.newInputStream(Paths.get(pathToFile))){
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// Encrypted section comes next
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long toSkip = 0x200;
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if (toSkip != fis.skip(toSkip))
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throw new Exception("Unable to skip offset: " + toSkip);
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ByteBuffer byteBuffer = ByteBuffer.allocate(0x1000);
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try (CipherInputStream cipherInputStream = AesCtrStream.getStream(header.getKey(), header.getSection0Ctr(), fis);) {
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for (int j = 0; j < 8; j++) {
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byte[] block = new byte[0x200];
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int actuallyRead;
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if ((actuallyRead = cipherInputStream.read(block)) != 0x200)
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throw new Exception("Read failure " + actuallyRead);
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byteBuffer.put(block);
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}
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}
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byte[] searchField = byteBuffer.array();
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for (int i = 0; i < 1024; i += 4) {
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kernelMap = new KernelMap(searchField, i);
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if (kernelMap.isValid(header.getSection0size()))
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return;
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}
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throw new Exception("Kernel map not found");
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}
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}
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public boolean exportKernel(String saveTo) throws Exception{
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Path filePath = Paths.get(pathToFile);
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AesCtrDecryptClassic decryptor = new AesCtrDecryptClassic(header.getKey(), header.getSection0Ctr());
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stream = new AesCtrClassicBufferedInputStream(decryptor,
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0x200,
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Files.size(filePath), // size of system2
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Files.newInputStream(filePath),
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Files.size(filePath));
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return export(saveTo, "Kernel.bin", 0x200, header.getSection0size());
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}
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public byte[] getRsa2048signature() { return rsa2048signature; }
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public System2Header getHeader() { return header; }
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public KernelMap getKernelMap() { return kernelMap; }
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public Ini1Provider getIni1Provider() throws Exception{
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if (ini1Provider == null)
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ini1Provider = new Ini1Provider(header, pathToFile, kernelMap);
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return ini1Provider;
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}
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}
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