Java中的DES加密误差（非法基本64字符20）

Question

我正在尝试为我的APCS-A最终项目制作一些加密/解密软件。我的大部分内容都使用了各种文本密码等，但是我试图使DES加密像大事一样工作。我无法在主要程序中使用它，因此我创建了自己的小东西来尝试先学习和测试。我认为我已经走了很远，但是我陷入了一个我不知道的错误。

import java.util.Scanner;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.*;
import java.util.Base64;
public class BigETest
{
    public static void main(String[]args) throws NoSuchAlgorithmException,NoSuchPaddingException,InvalidKeyException,IllegalBlockSizeException,BadPaddingException
    {
        Scanner kbd = new Scanner(System.in);
        
        System.out.print("Enter text: ");
        String t = kbd.nextLine();
        String[] rets = en(t);
        System.out.println("Encrypted: "+ rets[0]);
        System.out.println("Key: " + rets[1]);
        String dec = de(rets[0],rets[1]);
        System.out.println("Decrypted: "+dec);
    }
    public static String[] en(String inText) throws BadPaddingException,IllegalBlockSizeException,InvalidKeyException,NoSuchPaddingException,NoSuchAlgorithmException
    {
        KeyGenerator keyGen = KeyGenerator.getInstance("DES");
        SecretKey key = keyGen.generateKey();
        
        Cipher cipher = Cipher.getInstance("DES");
        
        cipher.init(Cipher.ENCRYPT_MODE, key);
        byte[] text = Base64.getUrlDecoder().decode(inText);
        byte[] encryptedBytes = cipher.doFinal(text);
        String encrypted = new String(Base64.getUrlEncoder().encodeToString(encryptedBytes));
        
        byte[] rawKey = key.getEncoded();
        String stringKey = new String(Base64.getUrlEncoder().encodeToString(rawKey));
        
        String[] ret = {encrypted,stringKey};
        return ret;
    }
    public static String de(String inText, String inKey) throws BadPaddingException,IllegalBlockSizeException,InvalidKeyException,NoSuchPaddingException,NoSuchAlgorithmException
    {
        byte[] keyB = Base64.getUrlDecoder().decode(inKey);
        SecretKey key = new SecretKeySpec(keyB, "DES");
        Cipher cipher = Cipher.getInstance("DES");
        cipher.init(Cipher.DECRYPT_MODE, key);
        byte[] text = Base64.getUrlDecoder().decode(inText);
        byte[] fin = cipher.doFinal(text);
        String dec = new String(Base64.getUrlEncoder().encodeToString(fin));
        return dec;
    }
}

很短并且没有空间，

Enter text: test
Encrypted: BOM9tFOUfWc=
Key: bq2ooSbc1n8=
Decrypted: test

输入

Enter text: BigTest
Encrypted: jme0nIAHXyA=
Key: 90UxVwetj2g=
Decrypted: BigTess=

则

Enter text: bigger test

java.lang.IllegalArgumentException: Illegal base64 character 20
    at java.base/java.util.Base64$Decoder.decode0(Base64.java:746)
    at java.base/java.util.Base64$Decoder.decode(Base64.java:538)
    at java.base/java.util.Base64$Decoder.decode(Base64.java:561)
    at BigETest.en(BigETest.java:34)
    at BigETest.main(BigETest.java:20)

如果 该代码有时可以起作用就在Google上的任何地方，我可以找到一些答案，但似乎没有任何作用。任何帮助将不胜感激。