获取org.tukaani.xz.CorruptedInputException：尝试解密受密码保护的（AES 256）7z文件时，压缩数据已损坏。而没有密码保护的7z文件可以解压缩而没有任何问题。两种情况都压缩相同的xls文件。
我正在使用Apache Commons compress和org.tukaani.xz。
示例代码供参考。
package com.concept.utilities.zip;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.lang.reflect.Field;
import org.apache.commons.compress.archivers.sevenz.SevenZArchiveEntry;
import org.apache.commons.compress.archivers.sevenz.SevenZFile;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Workbook;
public class DecryptionUtil {
static {
try {
Field field = Class.forName("javax.crypto.JceSecurity").getDeclaredField("isRestricted");
field.setAccessible(true);
field.set(null, java.lang.Boolean.FALSE);
} catch (Exception ex) {
}
}
public void SevenZFile(String directory, String encryptCompressFileName, String password) {
SevenZFile sevenZFile = null;
SevenZArchiveEntry entry = null;
try {
File file = new File(directory+encryptCompressFileName);
byte[] inputData = new byte[(int) file.length()];
FileInputStream fis = new FileInputStream(file);
fis.read(inputData);
fis.close();
// SeekableInMemoryByteChannel inMemoryByteChannel = new SeekableInMemoryByteChannel(inputData);
if(null != password){
byte[] pass = password.getBytes("UTF16");
sevenZFile = new SevenZFile(file, pass);
}else{
sevenZFile = new SevenZFile(file);
}
// Go through all entries
while (null != (entry = sevenZFile.getNextEntry())) {
// Maybe filter by name. Name can contain a path.
String processingFileName = entry.getName();
if (entry.isDirectory()) {
System.out.println(String.format("Found directory entry %s", processingFileName));
} else {
// If this is a file, we read the file content into a ByteArrayOutputStream ...
System.out.println(String.format("Unpacking start %s ...", processingFileName));
ByteArrayOutputStream contentBytes = new ByteArrayOutputStream();
// ... using a small buffer byte array.
byte[] buffer = new byte[2048];
int bytesRead;
while ((bytesRead = sevenZFile.read(buffer)) != -1) {
contentBytes.write(buffer, 0, bytesRead);
}
if (processingFileName.endsWith("xls")) {
// Writing into xls
Workbook wb = new HSSFWorkbook();
//String safeName = WorkbookUtil.createSafeSheetName(processingFileName);
//Sheet sheet = wb.createSheet(safeName);
FileOutputStream fileOut = new FileOutputStream(directory+processingFileName);
fileOut.write(contentBytes.toByteArray());
fileOut.flush();
wb.write(fileOut);
fileOut.close();
wb.close();
}else{ //regular file
System.out.println(contentBytes.toString("UTF-8"));
}
System.out.println(String.format("Unpacking finish %s ...", processingFileName));
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
sevenZFile.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) {
DecryptionUtil decrypt = new DecryptionUtil();
decrypt.SevenZFile("H:\\archives\\", "StudentsWoPassword.7z", null);
decrypt.SevenZFile("H:\\archives\\", "StudentsWithPassAES256.7z", "test");
}
}
StudentsWoPassword.7z已成功解压缩，但StudentsWithPassAES256.7z引发异常。
Unpacking start Students.xls ...
Unpacking finish Students.xls ...
org.tukaani.xz.CorruptedInputException: Compressed data is corrupt
at org.tukaani.xz.rangecoder.RangeDecoderFromStream.<init>(Unknown Source)
at org.tukaani.xz.LZMAInputStream.initialize(Unknown Source)
at org.tukaani.xz.LZMAInputStream.initialize(Unknown Source)
at org.tukaani.xz.LZMAInputStream.<init>(Unknown Source)
at org.apache.commons.compress.archivers.sevenz.LZMADecoder.decode(LZMADecoder.java:43)
at org.apache.commons.compress.archivers.sevenz.Coders.addDecoder(Coders.java:76)
at org.apache.commons.compress.archivers.sevenz.SevenZFile.buildDecoderStack(SevenZFile.java:933)
at org.apache.commons.compress.archivers.sevenz.SevenZFile.buildDecodingStream(SevenZFile.java:909)
at org.apache.commons.compress.archivers.sevenz.SevenZFile.getNextEntry(SevenZFile.java:222)
at com.concept.utilities.zip.DecryptionUtil.SevenZFile(DecryptionUtil.java:50)
at com.concept.utilities.zip.DecryptionUtil.main(DecryptionUtil.java:107)
我想念什么吗？我还有其他方法可以提取AES256 7z吗？
最佳答案
您的代码很好，从密码中提取字节时，只是使用了错误的字符集/编码。 SevenZFile类期望使用小尾数形式的UTF-16，因此您必须使用UTF-16LE而不是UTF-16（在编码数据时将使用大尾数）。
关于java - 使用apache compress/org.tukaani.xz在Java中解压缩/解密密码保护的(AES 256)7z文件的问题，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45190811/