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package cryptagetest;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;
public class securite{
private final static String cleSecrete = "Clin";
private final static String algorythme = "RC4";
private final static Key cle = new SecretKeySpec(cleSecrete.getBytes(), algorythme);
public static String text = new String();
public static void main(String[] args)
{
String texteCrypte = encrypte(text);
System.out.println(texteCrypte); //imprime "Äj•y§„ :Õ°Äó"
String texteEnClair = decrypte(texteCrypte);
System.out.println(texteEnClair); //imprime "javatropbien"
}
private static String encrypte(String texteEnClair)
{
Cipher cipher = null;
try
{
cipher = Cipher.getInstance(algorythme);
}
catch (NoSuchAlgorithmException e) {e.printStackTrace();}
catch (NoSuchPaddingException e) {e.printStackTrace();}
try
{
cipher.init(Cipher.ENCRYPT_MODE, cle);
}
catch (InvalidKeyException e) {e.printStackTrace();}
byte[] texteCrypte = null;
try
{
texteCrypte = cipher.doFinal(texteEnClair.getBytes());
}
catch (IllegalBlockSizeException e) {e.printStackTrace();}
catch (BadPaddingException e) {e.printStackTrace();}
return new String(texteCrypte);
}
private static String decrypte(String texteCrypte)
{
Cipher cipher = null;
try
{
cipher = Cipher.getInstance(algorythme);
}
catch (NoSuchAlgorithmException e) {e.printStackTrace();}
catch (NoSuchPaddingException e) {e.printStackTrace();}
try
{
cipher.init(Cipher.DECRYPT_MODE, cle);
}
catch (InvalidKeyException e) {e.printStackTrace();}
byte[] texteEnClair = null;
try
{
texteEnClair = cipher.doFinal(texteCrypte.getBytes());
}
catch (IllegalBlockSizeException e) {e.printStackTrace();}
catch (BadPaddingException e) {e.printStackTrace();}
return new String(texteEnClair);
}
public static void settext(String montext){
text = montext;
}
} |
