尝试解密在 ECB 中以 AES 加密的 Base64 中的文本时出现 BadPaddingException

Question

我正在尝试对密码进行 7° 挑战，我必须解密在 ECB 模式下使用 AES 加密的文件 Base64。 所以，我发现这段代码可以和教程一起工作，但是当我在练习中尝试使用给定的数据时，它给了我错误：

解密时出错：javax.crypto.BadPaddingException：给定最终块未正确填充。 如果在解密期间使用了错误的密钥，则可能会出现此类问题。

进程以退出代码 0 结束，代码如下：

public class ES7 {
    private static SecretKeySpec secretKey;
    private static byte[] key;

    public static void main(String[] args) throws InvalidAlgorithmParameterException, NoSuchPaddingException, IllegalBlockSizeException, IOException, NoSuchAlgorithmException, BadPaddingException, InvalidKeyException {
        String file = readBase64("C:\\Users\\Huawei\\OneDrive\\Desktop\\Lavoro\\Esercizi\\src\\ES7.txt");
        String res = decrypt(file,"YELLOW SUBMARINE"); --> this gave error of key

        // final String secretKey = "ssshhhhhhhhhhh!!!!";
        // String encryptedString= "Tg2Nn7wUZOQ6Xc+1lenkZTQ9ZDf9a2/RBRiqJBCIX6o=";
        // String decryptedString = decrypt(encryptedString, secretKey) ; --> this work
    }


    public static void setKey(final String myKey) {
        MessageDigest sha = null;
        try {
            key = myKey.getBytes("UTF-8");
            sha = MessageDigest.getInstance("SHA-1");
            key = sha.digest(key);
            key = Arrays.copyOf(key, 16);
            secretKey = new SecretKeySpec(key, "AES");
        } catch (NoSuchAlgorithmException | UnsupportedEncodingException e) {
            e.printStackTrace();
        }
    }

    public static String decrypt(final String strToDecrypt, final String secret) {
        try {
            setKey(secret);
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
            cipher.init(Cipher.DECRYPT_MODE, secretKey);
            return new String(cipher.doFinal(Base64.getDecoder().decode(strToDecrypt)));
        } catch (Exception e) {
            System.out.println("Error while decrypting: " + e.toString());
        }
        return null;
    }
    private static String readBase64(String file) {
        String filetext = "";
        String line;
        try
        {
            BufferedReader input = new BufferedReader(new FileReader(new File(file)));
            while ((line = input.readLine()) != null)
            {
                filetext += line;
            }
            input.close();
        } catch (IOException e){
            e.printStackTrace();
        }

        return filetext;
    }
}