Method decryptFile

src/de/mas/jnustool/util/Decryption.java:199–270

(InputStream inputStream, OutputStream outputStream,FEntry toDownload)

	}

	public boolean decryptFile(InputStream inputStream, OutputStream outputStream,FEntry toDownload) throws IOException{
		int BLOCKSIZE = 0x8000;		
		long dlFileLength = toDownload.getFileLength();
	    if(dlFileLength > (dlFileLength/BLOCKSIZE)*BLOCKSIZE){
	    	dlFileLength = ((dlFileLength/BLOCKSIZE)*BLOCKSIZE) +BLOCKSIZE;	    	
	    }
	
        byte[] IV = new byte[16];
        IV[1] = (byte)toDownload.getContentID();
     
        byte[] blockBuffer = new byte[BLOCKSIZE];
        
        int inBlockBuffer;      
        long wrote = 0;
        
        boolean first = true;
        ByteArrayBuffer overflow = new ByteArrayBuffer(BLOCKSIZE);
        if(progressListener != null){
        	progressListener.setTotal(toDownload.getFileLength());
        	progressListener.resetCurrent();
        }
        
        
        MessageDigest sha1 = null;
        try {
            sha1 = MessageDigest.getInstance("SHA1");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        
        do{ 
    		inBlockBuffer = Util.getChunkFromStream(inputStream,blockBuffer,overflow,BLOCKSIZE);
    		if(first){
    			first = false;        			
    		}else{
    			IV = null;
    		}
    		
    		byte[] output = decryptFileChunk(blockBuffer,BLOCKSIZE,IV);
    		
    		if(sha1 != null){
    		    sha1.update(output);
    		}
         	
         	if((wrote + inBlockBuffer) > toDownload.getFileLength()){             		
         		inBlockBuffer = (int) (toDownload.getFileLength()- wrote);             		
         	}
         	 if(progressListener != null){
         		progressListener.addCurrent(inBlockBuffer);
         	 }
         	wrote += inBlockBuffer;
    		outputStream.write(output, 0, inBlockBuffer);
        }while(inBlockBuffer == BLOCKSIZE);
        
        byte[] hash = sha1.digest();
        byte[] real_hash = toDownload.getHash();
        
        boolean result = true;