how to decrypt a file ?
i have encrypted file through following code now i want decrypt same file
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FileInputStream fin,fin1;
String strUser;
FileOutputStream fout,fout1;
KeyGenerator kg;
Cipher c;
ObjectInputStream obji;
ObjectOutputStream objo;
FileOutputStream fos;
FileInputStream fis;
byte iv[];
/** Creates a new instance of encryptData */
public void encryptData(String filename,String Keyval) {
}
public String encryptFile(String filename,String Keyval) {
String FileName,keyval;
FileName=filename;
keyval=Keyval;
FileInputStream fin,fin1;
String strUser;
FileOutputStream fout,fout1;
KeyGenerator kg;
Cipher c;
ObjectInputStream obji;
ObjectOutputStream objo;
FileOutputStream fos;
FileInputStream fis;
String filepath="";
byte iv[];
System.out.println("FileName " +FileName);
try {
kg = KeyGenerator.getInstance("DES");
c= Cipher.getInstance("DES/ECB/PKCS5Padding");
File fileEn = new File(FileName);
System.out.println("FileName " +fileEn.getName());
Key key = kg.generateKey();
fos=new FileOutputStream("/keyval.stk");
objo=new ObjectOutputStream(fos);
objo.writeObject(key);
objo.close();
c.init(Cipher.ENCRYPT_MODE, key);
fin=new FileInputStream(fileEn);
byte input[] = new byte[fin.available()];
fin.read(input);
byte encrypted[] =c.doFinal(input);
//String str=new String(encrypted);
//iv = c.getIV();
fout1=new FileOutputStream("D:/EncryptedFiles/"+fileEn.getName());
filepath="D:/EncryptedFiles/"+fileEn.getName() +","+"/keyval.stk";
fout1.write(encrypted );
fout1.close();
System.out.println("keyval " +keyval);
} catch (Exception e) {
e.printStackTrace();
}
return filepath;
}
}
