Question

Silverlight和PHP之间的加密协议存在问题。

我尝试在Silverlight中加密文本值，并在AES算法的帮助下在PHP中解密它。这个例子我在Silverlight中如何加密它：

<!-- language: lang-cs -->
SaveFileDialog dlg = new SaveFileDialog();
dlg.Filter = "Crypt file  (CRP)|*.crp";

bool res = dlg.ShowDialog().Value;

if (res == true)
{
    Stream outStream = dlg.OpenFile();

    AesManaged cryptAlg = new AesManaged();
    ICryptoTransform encryptor = cryptAlg.CreateEncryptor(_encryptKey, _encryptIv);
    CryptoStream cryptStream = new CryptoStream(outStream, encryptor, CryptoStreamMode.Write);

    byte[] buffer = Encoding.UTF8.GetBytes(textBox1.Text);
    int size = buffer.Length;
    cryptStream.Write(buffer, 0, size);
    cryptStream.Close();
    outStream.Close();
}

本例如何在PHP中解密它：

<!-- language: lang-php -->
function fb_get_contents($filename) {
    $fp = fopen($filename, "rb");
    $cc = fgets($fp);
    fclose($fp);
    return $cc;
}

$value = fb_get_contents($_FILES['file']['tmp_name']);

$module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, ''); 
$blockSize = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);

$key = substr($key, 0, 16);
$iv = $key;
$rc = mcrypt_generic_init($module, $key, $iv); 

$value = base64_decode($value);
$value = mdecrypt_generic($module, $value); 

//apply pkcs7 padding removal
$packing = ord($value[strlen($value) - 1]);
if($packing && $packing < $blockSize){
    for($P = strlen($value) - 1; $P >= strlen($value) - $packing; $P--){
        if(ord($value{$P}) != $packing){
            $packing = 0;
        }//end if
    }//end for
}//end if 

$value = substr($value, 0, strlen($value) - $packing);

它不起作用。我认为这可能是AES算法的填充参数的问题。感谢。

Answer 1

缺少其余的c＃代码以及“无法正常工作”的含义，我无法确定，但我会说这是你的问题。

$ iv = $ key;

您想要提取iv表格cryptAlg.IV

此外，我不认为默认编码是AesManaged的PKCS7和2）你有时需要在缓冲区上调用flush来获取最后一个块。

Silverlight + PHP - AES crypt

1 个答案: