Question

基本上该文件包含16个字节的文本，但是当它超过16个字节时，它会抛出错误： hexBinary需要是偶数长度。

错误：

byte[] result = cipher.doFinal(DatatypeConverter.parseHexBinary(content));

我是否需要使用其他密码方法或填充？

public static void main(String[] args) throws Exception {
  convertToHex(System.out, new File("E:\\TESTS\\kristersss.txt"));
  //write the output into a file
  convertToHex(new PrintStream("E:\\TESTS\\kristersssHex.txt"), new File("E:\\TESTS\\kristersss.txt"));

  System.out.println( "  " ); 
  System.out.println( "128-bit hex key example: ffffffffffffffffffffffffffffffff" );
  String content = new Scanner(new File("E:\\TESTS\\kristersssHex.txt")).useDelimiter("\\Z").next();
  System.out.println("----------FAILA SATURS----------");


  System.out.println(content);

  System.out.println("------------------------------");    
  Scanner scanner = new Scanner( System.in );

  System.out.println( "Enter 128-bit hex key: " );
  final String keyHex = scanner.nextLine();

  final String plaintextHex = "aaaaaaaaaabbbbbbbbbbbccccccccccff";
  SecretKey key = new SecretKeySpec(DatatypeConverter
      .parseHexBinary(keyHex), "AES");

  Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
  cipher.init(Cipher.ENCRYPT_MODE, key);

  byte[] result = cipher.doFinal(DatatypeConverter
      .parseHexBinary(content));

  String a = DatatypeConverter.printHexBinary(result);
  System.out.println("----------FAILA SATURA ENKRIPTACIJA----------");
  System.out.println(DatatypeConverter.printHexBinary(result));
  BufferedWriter output = null;
  try {

    File file = new File("E:\\TESTS\\kristerssEncrypts.txt");
    output = new BufferedWriter(new FileWriter(file));
    output.write(a);
  } catch ( IOException e ) {
    e.printStackTrace();
  } finally {
    if ( output != null ) {
      output.close();
    }
  }

  Cipher cipherd = Cipher.getInstance("AES/ECB/NoPadding");
  cipherd.init(Cipher.DECRYPT_MODE, key);

  byte[] result2 = cipherd.doFinal(result);
  System.out.println("----------FAILA SATURA DEKRIPTACIJA----------");
  System.out.println(DatatypeConverter.printHexBinary(result2));
  BufferedWriter outputt = null;
  String aa = DatatypeConverter.printHexBinary(result2);
  try {

    File file = new File("E:\\TESTS\\kristerssDekrypts.txt");
    outputt = new BufferedWriter(new FileWriter(file));
    outputt.write(aa);
  } catch ( IOException e ) {
    e.printStackTrace();
  } finally {
    if ( outputt != null ) {
      outputt.close();
    }
  }

将文件字符串转换为十六进制的类。

public static void convertToHex(PrintStream out, File file) throws IOException {
        InputStream is = new FileInputStream(file);

        int bytesCounter =0;
        int value = 0;
        StringBuilder sbHex = new StringBuilder();
        StringBuilder sbText = new StringBuilder();
        StringBuilder sbResult = new StringBuilder();

        while ((value = is.read()) != -1) {
            //convert to hex value with "X" formatter
                sbHex.append(String.format("%02X", value));

            //If the chracater is not convertable, just print a dot symbol "."
            if (!Character.isISOControl(value)) {
                sbText.append((char)value);
            }else {
                sbText.append(".");
            }

            //if 16 bytes are read, reset the counter,
                //clear the StringBuilder for formatting purpose only.
            if(bytesCounter==15){
                sbResult.append(sbHex).append("");
                sbHex.setLength(0);
                sbText.setLength(0);
                bytesCounter=0;
            }else{
                bytesCounter++;
            }
           }

        //if still got content
        if(bytesCounter!=0){
             //add spaces more formatting purpose only
            for(; bytesCounter<16; bytesCounter++){
            //1 character 3 spaces
            sbHex.append("   ");
            }
            sbResult.append(sbHex).append("");
            }

            out.print(sbResult);
            is.close();
      }

我正在努力实现的目标：

获取包含文字的文件。
将文字转换为十六进制。
将hex转换为binaryhex。
加密文件内容。
写入新文件。
解密新的十六进制内容。
写入新文件。

Java hexBinary需要是偶数长度

0 个答案: