问题描述

更新

我对 C# 代码进行了更改，因此它使用的块大小为 256.但现在 hello world 看起来像这样 http://pastebin.com/5sXhMV11 并且我无法弄清楚我应该使用 rtrim() 来摆脱最后的混乱.

此外，当您说 IV 应该是随机的时，您的意思是不要多次使用相同的 IV 还是我编码错误的方式?

再次感谢！

我正在尝试使用用 C# 加密的 PHP 解密字符串.我似乎无法让 PHP 使用 mcrypt 解密它，请帮忙.我在使用 php 时遇到以下错误，所以我猜我没有正确设置 IV.

错误:IV参数必须和blocksize一样长

两个函数使用相同的密码、密钥、IV 并设置为 CBC 模式:

来自 c# 的加密文本 = UmzUCnAzThH0nMkIuMisqg==
键 32 长 = qwertyuiopasdfghjklzxcvbnmqwerty
iv 16 长 = 1234567890123456

C#

 public static string EncryptString(string message, string KeyString, string IVString){byte[] Key = ASCIIEncoding.UTF8.GetBytes(KeyString);byte[] IV = ASCIIEncoding.UTF8.GetBytes(IVString);字符串加密=空；RijndaelManaged rj = new RijndaelManaged();rj.Key = 密钥；rj.IV = IV；rj.Mode = CipherMode.CBC;尝试{MemoryStream ms = new MemoryStream();使用 (CryptoStream cs = new CryptoStream(ms, rj.CreateEncryptor(Key, IV), CryptoStreamMode.Write)){使用 (StreamWriter sw = new StreamWriter(cs)){sw.Write(消息);sw.关闭();}cs.Close();}字节 [] 编码 = ms.ToArray();加密 = Convert.ToBase64String(encoded);女士关闭()；}捕获(加密异常 e){Console.WriteLine("发生密码错误:{0}", e.Message);返回空；}catch (UnauthorizedAccessException e){Console.WriteLine("发生文件错误:{0}", e.Message);返回空；}捕获(例外 e){Console.WriteLine("发生错误:{0}", e.Message);}最后{rj.清除();}返回加密；}

PHP

var $mcrypt_cipher = MCRYPT_RIJNDAEL_256;var $mcrypt_mode = MCRYPT_MODE_CBC;函数解密($key，$iv，$encrypted){$encrypted = base64_decode($encrypted);$decrypted = rtrim(mcrypt_decrypt($this->mcrypt_cipher, $key, $encrypted, $this->mcrypt_mode, $iv), "");;返回 $decrypted;}

谢谢

如果您想在 C# 应用程序中使用 Rijndael256，您必须将 BlockSize 设置为 256.

RijndaelManaged rj = new RijndaelManaged();rj.BlockSize = 256;

然后你的 iv 也必须是 256 位长.
请参见 SymmetricAlgorithm.BlockSize 属性><小时>

或者反过来:目前您的 C# 应用程序使用 Rijndael128，因此您的 php 脚本也必须使用.

mcrypt_cipher, $key, base64_decode($encrypted), $this->mcrypt_mode, $iv_utf);}}$encrypted = "UmzUCnAzThH0nMkIuMisqg==";$key = "qwertyuiopasdfghjklzxcvbnmqwerty";$iv = "1234567890123456";$foo = 新 Foo;echo $foo->decrypt($key, $iv, $encrypted);

打印hello world

UPDATED

I have made the changes to the C# code so it uses a block size of 256. but now the hello world looks like this http://pastebin.com/5sXhMV11 and I cant figure out what I should use with rtrim() to get ride of the mess at the end.

Also when you say the IV should be random, by this do you mean don't use the same IV more then once or is the way I have coded it wrong?

Thanks again!

Hi,

I'm trying to decrypt a string with PHP that was encrypted in C#. I can't seem to get PHP to decrypt it using mcrypt and could do with some help please. I get the following error with php so I am guessing I'm not setting the IV correctly.

Error: The IV parameter must be as long as the blocksize

Both functions use the same cipher, key, IV and set to CBC mode:

encrypted text from c# = UmzUCnAzThH0nMkIuMisqg==
key 32 long = qwertyuiopasdfghjklzxcvbnmqwerty
iv 16 long = 1234567890123456

C#

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

        string encrypted = null;
        RijndaelManaged rj = new RijndaelManaged();
        rj.Key = Key;
        rj.IV = IV;
        rj.Mode = CipherMode.CBC;

        try
        {
            MemoryStream ms = new MemoryStream();

            using (CryptoStream cs = new CryptoStream(ms, rj.CreateEncryptor(Key, IV), CryptoStreamMode.Write))
            {
                using (StreamWriter sw = new StreamWriter(cs))
                {
                    sw.Write(message);
                    sw.Close();
                }
                cs.Close();
            }
            byte[] encoded = ms.ToArray();
            encrypted = Convert.ToBase64String(encoded);

            ms.Close();
        }
        catch (CryptographicException e)
        {
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
            return null;
        }
        catch (UnauthorizedAccessException e)
        {
            Console.WriteLine("A file error occurred: {0}", e.Message);
            return null;
        }
        catch (Exception e)
        {
            Console.WriteLine("An error occurred: {0}", e.Message);
        }
        finally
        {
            rj.Clear();
        }

        return encrypted;
    }

PHP

var $mcrypt_cipher = MCRYPT_RIJNDAEL_256;
var $mcrypt_mode = MCRYPT_MODE_CBC;

function decrypt($key, $iv, $encrypted)
{
    $encrypted = base64_decode($encrypted);

    $decrypted = rtrim(mcrypt_decrypt($this->mcrypt_cipher, $key, $encrypted, $this->mcrypt_mode, $iv), "");;
    return $decrypted;
}

Thanks

If you want to use Rijndael256 in your C# application you have to set the BlockSize to 256.

RijndaelManaged rj = new RijndaelManaged();
rj.BlockSize = 256;

And then your iv has to be 256 bits long as well.
see SymmetricAlgorithm.BlockSize Property

Or the other way round: Currently your C# application uses Rijndael128 and so must your php script.

<?php
class Foo {
  protected $mcrypt_cipher = MCRYPT_RIJNDAEL_128;
  protected $mcrypt_mode = MCRYPT_MODE_CBC;

  public function decrypt($key, $iv, $encrypted)
  {
    $iv_utf = mb_convert_encoding($iv, 'UTF-8');
    return mcrypt_decrypt($this->mcrypt_cipher, $key, base64_decode($encrypted), $this->mcrypt_mode, $iv_utf);
  }
}



$encrypted = "UmzUCnAzThH0nMkIuMisqg==";
$key = "qwertyuiopasdfghjklzxcvbnmqwerty";
$iv = "1234567890123456";

$foo = new Foo;
echo $foo->decrypt($key, $iv, $encrypted);

prints hello world

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