116 lines
4.1 KiB
Java
116 lines
4.1 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.RainbowDump;
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import libKonogonka.ctraes.AesCtrClassic;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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import java.io.BufferedInputStream;
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import java.io.BufferedOutputStream;
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import java.io.File;
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import java.nio.file.Files;
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import java.nio.file.Paths;
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public class System2Provider {
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private final static Logger log = LogManager.getLogger(System2Provider.class);
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private byte[] Rsa2048signature;
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private System2Header header;
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// ...
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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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readHeaderCtr();
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}
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private void readHeaderCtr() throws Exception{
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try (BufferedInputStream stream = new BufferedInputStream(Files.newInputStream(Paths.get(pathToFile)))){
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if (0x100 != stream.skip(0x100))
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throw new Exception("Can't skip RSA-2048 signature offset (0x100)");
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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("System2 header is too small");
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this.header = new System2Header(headerBytes, keyChainHolder.getRawKeySet());
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}
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}
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public boolean exportKernel(String saveTo) throws Exception{
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AesCtrClassic aesCtrClassic = new AesCtrClassic(header.getKey(), header.getSection0Ctr()); // TODO: DELETE
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File location = new File(saveTo);
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location.mkdirs();
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try (BufferedInputStream stream = new BufferedInputStream(Files.newInputStream(Paths.get(pathToFile)));
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BufferedOutputStream extractedFileBOS = new BufferedOutputStream(
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Files.newOutputStream(Paths.get(saveTo+File.separator+"Kernel.bin")))){
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long kernelSize = header.getSection0size();
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long toSkip = 0x200;
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if (toSkip != stream.skip(toSkip))
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throw new Exception("Unable to skip offset: "+toSkip);
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int blockSize = 0x200;
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if (kernelSize < 0x200)
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blockSize = (int) kernelSize;
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long i = 0;
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byte[] block = new byte[blockSize];
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int actuallyRead;
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while (true) {
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if ((actuallyRead = stream.read(block)) != blockSize)
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throw new Exception("Read failure. Block Size: "+blockSize+", actuallyRead: "+actuallyRead);
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byte[] decrypted = aesCtrClassic.decryptNext(block);
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if (i > 0 && i <= 0x201){
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RainbowDump.hexDumpUTF8(decrypted);
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}
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if (i == 0){
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RainbowDump.hexDumpUTF8(decrypted);
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}
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extractedFileBOS.write(decrypted);
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i += blockSize;
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if ((i + blockSize) > kernelSize) {
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blockSize = (int) (kernelSize - i);
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if (blockSize == 0)
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break;
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block = new byte[blockSize];
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}
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}
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}
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catch (Exception e){
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log.error("File export failure", e);
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return false;
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}
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return true;
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}
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public System2Header getHeader() {
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return header;
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}
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}
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