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import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.SecretKey;
public class MainClass {
public static void main(String[] args) throws Exception {
desEncrypt("plaintextfile", "ciphertextfile");
}
public static void desEncrypt(String f1, String f2) throws Exception {
SecretKey key = null;
ObjectInputStream keyFile = new ObjectInputStream(new FileInputStream("DESKey.ser"));
key = (SecretKey) keyFile.readObject();
keyFile.close();
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, key);
CipherInputStream in = new CipherInputStream(new BufferedInputStream(new FileInputStream(f1)),
cipher);
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(f2));
int i;
do {
i = in.read();
if (i != -1)
out.write(i);
} while (i > 0);
in.close();
out.close();
}
}
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