decrypt without save
I'm trying to encrypt and decrypt .jpg files.
I have two tools: the first one writes encrypted data to a DVD and the second one decrypts and opens the data from the DVD.
Both tools are working fine as long as a permit the second tool to write somewhere on my harddisc the decrypted file. So the second tool decrypts a file, writes it on my harddisc and opens it in a JPanel.
The problem is that I don't want to save the decrypted file. I want to decrypt and open it at once, without saving it. If this is not possible, then I 'ld like to delete the file as soon as it is shown on the panel. But the delete method of the File class doesn't help me eather.
[683 byte] By [
Greeta] at [2007-10-3 3:17:27]
Here comes my decrypt method:
public void decrypt( InputStream aInputStream, OutputStream out ) {
try {
// Bytes read from in will be decrypted
aInputStream = new CipherInputStream(aInputStream, fDecCipher);
// Read in the decrypted bytes and write the cleartext to out
int numRead = 0;
while ((numRead = aInputStream.read(buf)) >= 0) {
out.write(buf, 0, numRead);
}
out.close();
}
catch (java.io.IOException e) {
e.printStackTrace( );
}
}
and here is how I call it:
File outFile = File.createTempFile( "test", ".jpg", new File( "c:/xc_temp" ) );
FileOutputStream outStream = new FileOutputStream( outFile );
encrypter.decrypt( new FileInputStream( "C:/xc_test/ACO/1930/03/19300305/ACO-004-19300305/articles/ACO-004-19300305001.jpg" ), outStream );
openEncryptedFile( outFile.getAbsolutePath() );
outStream.close();
boolean deleted = outFile.delete();
Greeta at 2007-7-14 21:09:02 >
Please don't take this wrong but I think you should learn Java. The solution is trivial
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
encrypter.decrypt( new FileInputStream( "C:/xc_test/ACO/1930/03/19300305/ACO-004-19300305/articles/ACO-004-19300305001.jpg" ), outStream );
byte[] decryptedBytes = outStream.toByteArray();
My suggestion is when decrypting file in decrypt() method to save data to ByteArrayOutputStream and then pass bytes from decrypted image as ByteArrayInputStream to openEncryptedFile() method.
ByteArrayOutputStream baos = new ByteArrayOutputStream();
encrypter.decrypt( new FileInputStream( "C:/xc_test/ACO/1930/03/19300305/ACO-004-19300305/articles/ACO-004-19300305001.jpg" ), baos );
openEncryptedFile(new ByteArrayInputStream(baos.toByteArray()));
I suppouse that in openEncryptedFile() method you read image data from file as input stream and than pass it to visual component so changes to your code will be small.
