CS计算机代考程序代写 algorithm public class Encryption {

public class Encryption {
private static String sKey=”xiaohui.zhu”; // encryption key
// create a secret key
private static SecretKey makeKeyFactory() throws Exception{
SecretKeyFactory des = SecretKeyFactory.getInstance(“DES”);// DES algorithm
SecretKey secretKey = des.generateSecret(new DESKeySpec(sKey.getBytes()));
return secretKey;
}
//get an encrypted string using DES algorithm
public static String encrypt(String text){
Cipher cipher = Cipher.getInstance(“DES”);
SecretKey secretKey = makeKeyFactory();
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
return new String(Base64.getEncoder().encode(cipher.doFinal(text.getBytes())));
}
// retrive a normal string from an encrypted string
public static String decrypt(String text){
Cipher cipher = Cipher.getInstance(“DES”);
SecretKey secretKey = makeKeyFactory();
cipher.init(Cipher.DECRYPT_MODE, secretKey);
return new String(cipher.doFinal(Base64.getDecoder().decode(text.getBytes())));
}
}