我有一个PHP方案,将PDF文档加密为xxx, 存档,这一产出正通过一个C#方案阅读,该方案将这xxx号档案重新贴上PDF档案。

我的问题是,当我打开C# 加密的档案时,人民抵抗力量的读者告诉我,档案是腐败的。 当我在PHP的加密文本和C# I的加密中,档案被加密时,问题只是出现在人民抵抗力量的档案中,或者说出现在BINaire的档案中。

任何建议!

注:

1. In PHP I use mcrypt extension Rijndael algorithm CBC PKCS7 padding (padding is done manually)
2. In C# I use RijndaelManaged class to encrypt and decrypt data

http://www.ohchr.org。

Here is encryption method that I use in PHP:

    function encrypt($key, $iv, $text) {
        ini_set (  memory_limit ,  -1  );
        $mcrypt_cipher = MCRYPT_RIJNDAEL_256;
        $mcrypt_mode = MCRYPT_MODE_CBC;
        $text=addpadding($text,mcrypt_get_block_size($mcrypt_cipher, cbc ));
        $encrypted = rtrim ( mcrypt_encrypt ( $mcrypt_cipher, $key, $text, $mcrypt_mode, $iv ), "" );
        $encrypted = base64_encode ( $encrypted );
        return $encrypted;
    }

这里是C#中的加密方法:

    public static string DecryptString(string message, string KeyString, string IVString)
    {
        byte[] Key = Encoding.UTF8.GetBytes(KeyString);
        byte[] IV = Encoding.UTF8.GetBytes(IVString);

        string decrypted = null;
        RijndaelManaged rj = new RijndaelManaged();
        rj.BlockSize = 256;
        rj.Key = Key;
        rj.IV = IV;
        rj.Mode = CipherMode.CBC;
        rj.Padding = PaddingMode.PKCS7;
        try
        {
            MemoryStream ms = new MemoryStream();
            //Encoding enc = new UTF8Encoding();
            byte[] messageBytes = Convert.FromBase64String(message);
            using (CryptoStream cs = new CryptoStream(ms, rj.CreateDecryptor(Key, IV), CryptoStreamMode.Write))
            {
                //byte[] messageBytes = enc.GetBytes(message);

                cs.Write(messageBytes, 0, messageBytes.Length);
                cs.Close();
            }
            byte[] encoded = ms.ToArray();
            decrypted = Encoding.UTF8.GetString(encoded);

            ms.Close();
        }
        catch (Exception e)
        {
            MessageBox.Show("An error occurred:"+ e.Message);
        }
        finally
        {
            rj.Clear();
        }

        return decrypted;
    }

这里是我如何在C#中称解密,我如何写出产出:

                string Key = cryptography.MD5("X-Ware" + cryptography.MD5("123"));
                string IV = cryptography.MD5("XWare");
                string decrypted = cryptography.DecryptString(contents, Key, IV);
                string outputFilename = cryptography.MD5(OFD.FileName) + ".tmp";

                StreamWriter sw = new StreamWriter("C:\Windows\Temp\" + outputFilename, false, Encoding.UTF8);
                BinaryWriter bw = new BinaryWriter(sw.BaseStream, Encoding.UTF8);
                //sw.Write(decrypted);
                bw.Write(decrypted);
                sw.Close();
                bw.Close();