Question

private void adjustRowHeights(Sheet sheet, List<RowInfo> rows, SortedSet<Integer> createdColumnNumbers) {
    SortedMap<Integer, Float> columnWidthsInPx = [] as TreeMap;
    createdColumnNumbers.each {
        columnWidthsInPx.put(it,  sheet.getColumnWidthInPixels(it));
    }
    rows.each { RowInfo rowInfo ->
        if ( rowInfo.hasMergedCells ) {
            Row excelRow = sheet.getRow(rowInfo.rowIndex);

        // Find the column with the longest text - that's the one that will determine
        // the row height
        //
        NestedCellInfo longestCell = rowInfo.getCellWithLongestContent();
        String cellText = longestCell.getText();
        if ( cellText != null && cellText.size() > 5 ) {
            int colIdx = rowInfo.cells.indexOf(longestCell);

            // Figure out available width in pixels, taking colspans into account
            //
            float columnWidthInPx = columnWidthsInPx[colIdx];
            int numberOfMergedColumns = longestCell.colSpan;
            (numberOfMergedColumns - 1).times {
                columnWidthInPx += columnWidthsInPx[colIdx + it];
            }

            // Setup the font we'll use for figuring out where the text will be wrapped
            //
            XSSFFont cellFont = longestCell.getCellFont();
            int fontStyle = Font.PLAIN;
            if ( cellFont.getBold() ) fontStyle = Font.BOLD; 
            if ( cellFont.getItalic() ) fontStyle = Font.ITALIC;

            java.awt.Font currFont = new java.awt.Font(
                cellFont.getFontName(), 
                fontStyle, 
                cellFont.getFontHeightInPoints());

            AttributedString attrStr = new AttributedString(cellText);
            attrStr.addAttribute(TextAttribute.FONT, currFont);

            // Use LineBreakMeasurer to count number of lines needed for the text
            //
            FontRenderContext frc = new FontRenderContext(null, true, true);
            LineBreakMeasurer measurer = new LineBreakMeasurer(attrStr.getIterator(), frc);
            int nextPos = 0;
            int lineCnt = 0;
            while (measurer.getPosition() < cellText.length()) {
                nextPos = measurer.nextOffset( columnWidthInPx );
                lineCnt++;
                measurer.setPosition(nextPos);
            }

            if ( lineCnt > 1 ) {
                excelRow.setHeight((short)(excelRow.getHeight() * lineCnt * /* fudge factor */ 0.7));
            }
        }
    }
}

我发现这种方式可以加密字符串，工作正常，但当我尝试解密字符串时，上面的代码不起作用。解密输出喜欢

S '= ɚ？

有人知道如何修复解密部分吗？提前感谢！

Answer 1

正如我在评论中所述，这就是你所拥有的

  //encrypt
 $encryptxt=mcrypt_encrypt(MCRYPT_RIJNDAEL_256,$key,$str,MCRYPT_MODE_CBC,$iv);  
  $encryptxt64=base64_encode($encryptxt);

 //decrypt 
   $decryptxt=mcrypt_decrypt(MCRYPT_RIJNDAEL_256,$key,$str,MCRYPT_MODE_CBC,$iv);  
  $decryptxt64=base64_decode($decryptxt);

加密
base64 encode
解密
base64 decode

它应该是FILO（倒数第一个）

加密
base64 encode
base64 decode
解密

这样你就可以解密加密输出和不 base64编码输出，

喜欢如此：

$encryptxt=mcrypt_encrypt(MCRYPT_RIJNDAEL_256,$key,$str,MCRYPT_MODE_CBC,$iv);  
  $encryptxt64=base64_encode($encryptxt);

//decrypt 
 $decryptxt64=base64_decode($str);
$decryptxt=mcrypt_decrypt(MCRYPT_RIJNDAEL_256,$key,$decryptxt64,MCRYPT_MODE_CBC,$iv);

作为注释，MCRYPT_RIJNDAEL_256不是AES 256，为此您需要MCRYPT_RIJNDAEL_128和32byte密钥，所以在某些方面128更好，（128是更小的块密码）

我建议做的另一件事是在输入字符串中使用md5哈希，然后在加密之前将其预先输入到输入字符串。这样，当您解密它时，您可以包含前32个字符并使用它来检查输入。基本上你需要知道输入字符串才能看出它是否被解密。但是，通过对它进行散列然后进行比较，您不再需要知道它是否有效。

所以一起（没有经过测试，但应该让你接近）

function encrypt ($key,$iv,$str)
{     
  $block=mcrypt_get_block_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_CBC);
  $padding=$block-(strlen($str) % $block);
  $str.=str_repeat(chr($padding), $padding);  

  ///prepend a md5 hash of the plain text input before encrypting it ( so we can check it later )
  $str = md5( $str ) . $str;

    $encryptxt=mcrypt_encrypt(MCRYPT_RIJNDAEL_256,$key,$str,MCRYPT_MODE_CBC,$iv);  
  $encryptxt64=base64_encode($encryptxt);
  return $encryptxt64;
}
function decrypt ($key,$iv,$str)
{     
  $block=mcrypt_get_block_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_CBC);
  $padding=$block-(strlen($str) % $block);
  $str.=str_repeat(chr($padding), $padding);  

  $decryptxt64=base64_decode($str);
  $decryptxt=mcrypt_decrypt(MCRYPT_RIJNDAEL_256,$key,$decryptxt64,MCRYPT_MODE_CBC,$iv);  

   ///Separate the md5 hash from the other text, and then hash the other text and compare to the hash we included when encrypting  if they are = it all worked.
  /// it is perfectly safe to use md5 here because it will be part of what we encrypt, and not accessible until it is decrypted. 
 ///it's sole purpose is to give us 2 things we can compare to check that the decryption worked
  $hash = substr( $decryptxt, 0, 32); //find first 32 characters (md5 output is always 32 characters long )
  $decryptxt = substr($decryptxt, 33); //find everything after the fist 32
  if( $hash != md5($decryptxt) ){
        die( 'fail' ); /// or some other error
  }


  return $decryptxt64;
}

php使用MCRYPT_RIJNDAEL_256解密字符串

1 个答案: