How to decompress an AES-256 Encrypted zip files?

问题

I am developing an android application which requires to decompress an AES-256 encrypted zip files, is there any libraries out there that I can use to accomplish that?

I am greatly appreciative of any guidance or help.

回答1:

zip4j, java library to handle Zip files (Open source, Apache License v2.0).

http://www.lingala.net/zip4j/

Create, Add, Extract, Update, Remove files from a Zip file
Read/Write password protected Zip files
Supports AES 128/256 Encryption
Supports Standard Zip Encryption

You can download binary, sources and examples.

回答2:

I ended up using an external library at http://code.google.com/p/winzipaes/

it's limited to compression/decompression Zip files encrypted with AES-256 ONLY

but at least it fits my need.

回答3:

It depends on you encoding of encrypted zip files. Be more specific please. If its compress then encrypt then you decompress then decrypt the file using java.util.zip.GZIPInputStream

回答4:

As far as I remember AES encrypted ZIP files were introduced some years the first time by WinZip. On the WinZip home page there is a detailed explanation how the AES encrypted ZIP files differs from a standard ZIP file:

http://www.winzip.com/aes_info.htm

回答5:

I am working on a normal JRE. Using http://www.lingala.net/zip4j/ the following code works to decrypt a zip file:

ZipFile zipFile = new ZipFile(zipFile);
zipFile.setPassword(password);
for (Object fileHeaderObj : zipFile.getFileHeaders()) {
  FileHeader fileHeader = (FileHeader) fileHeaderObj;
  String fileName = fileHeader.getFileName();
  ZipInputStream zipIn = zipFile.getInputStream(fileHeader);
  // do whatever with the input stream
}