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我在尝试解密已保存到文本文件的消息时遇到了一些问题。尝试解密消息时，我收到错误消息-“线程'main'在'调用Result::unwrap()一个Err值：BlockModeError'时惊慌失措”。这真的并没有给我太多可玩的东西。而且我在网上找不到任何关于其他人有问题的信息。我正在使用这个板条箱block-modes。这是他们用来使用块模式文档的示例

use block_modes::block_padding::Pkcs7;

type Aes128Cbc = Cbc<Aes128, Pkcs7>;

pub struct FileHandler{
    file: File,
    file_path: String,
    encyption_key: [u8; 16],
}

impl FileHandler{
    pub fn new() -> FileHandler{
        let mut temp_dir = PathBuf::from(UserDirs::new().unwrap().document_dir().unwrap());
        temp_dir.push("storage.txt"); // Creating Path for docs folder
        let temp_file: File;

        match OpenOptions::new().append(true).read(true).open(&temp_dir){
            Ok(result) => {temp_file = result},
            Err(_) => { temp_file = File::create(&temp_dir).expect(&format!("Could not create file! - {}", temp_dir.to_str().unwrap())); }
        } // Opening the file in read and append

        FileHandler {
            file: temp_file,
            file_path: String::from(temp_dir.to_str().unwrap()),
            encyption_key: [0u8; 16],
        } // returning the FileHandler object
    }

    fn write(&mut self, string: &str, url_key: &Url){  

        let mut iv_buffer = [0u8; 16];

        let cypher = Aes128Cbc::new_from_slices(&self.encyption_key, &iv_buffer).unwrap(); // creates the cyoher object
        for letter in cypher.encrypt_vec(string.as_bytes()){
            self.file.write_all(&[letter]).expect("Failed to write to file!"); // loops through each encrypted letter and writes it
        }
    }

    pub fn read_details(&mut self) -> Option<(String, String)> {

        let mut iv_buffer = [0u8; 16];

        let metadata = fs::metadata(&self.file_path).unwrap();
        let mut buffer = vec![0; metadata.len() as usize]; // making a buffer that will fit the contents of the file
        self.file.read(&mut buffer).expect("buffer overflow"); // reading to the buffer

        let cypher = Aes128Cbc::new_from_slices(&self.encyption_key, &iv_buffer).unwrap(); // creating cypher object
            
        let temp = cypher.decrypt_vec(&mut buffer).unwrap(); // Where the error occurs

        None
    }
}

任何帮助都将不胜感激，因为我已经为此困扰了一段时间。

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