Mcrypt 和 base64 与 PHP 和 c#

2022-01-21 00:00:00 encryption base64 php c# mcrypt

我在两个平台上编写了相同的方法，我认为这些方法应该会产生相同的结果，但它没有发生.我用相同的密钥加密了相同的文本，结果不同.有人能弄清楚为什么会这样吗?

I have written the same methods in two platforms which I believe should result same thing but its not happening. I have encrypted the same text with same key which result different. Can someone figure it out why is it happening ?

字符串:这是测试

密钥:1234567812345678

PHP 加密字符串:ybUaKwQlRNwOjJhxLWtLYQ==

C# 加密字符串:r2YjEFPyDDacnPmDFcGTLA==

C# 函数

static string Encrypt(string plainText, string key)
{
    string cipherText;
    var rijndael = new RijndaelManaged()
    {
        Key = Encoding.UTF8.GetBytes(key),
        Mode = CipherMode.ECB,
        BlockSize = 128,
    };
    ICryptoTransform encryptor = rijndael.CreateEncryptor(rijndael.Key, rijndael.IV);

    using (var memoryStream = new MemoryStream())
    {
        using (var cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
        {
            using (var streamWriter = new StreamWriter(cryptoStream))
            {
                streamWriter.Write(plainText);
                streamWriter.Flush();
            }
            cipherText = Convert.ToBase64String(memoryStream.ToArray());
            //cryptoStream.FlushFinalBlock();
        }
    }
    return cipherText;
}

private static string Decrypt(string cipherText, string key)
{
    string plainText;
    byte[] cipherArray = Convert.FromBase64String(cipherText);
    var rijndael = new RijndaelManaged()
    {
        Key = Encoding.UTF8.GetBytes(key),
        Mode = CipherMode.ECB,
        BlockSize = 128
    };
    ICryptoTransform decryptor = rijndael.CreateDecryptor(rijndael.Key, rijndael.IV);

    using (var memoryStream = new MemoryStream(cipherArray))
    {
        using (var cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
        {
            using (var streamReader = new StreamReader(cryptoStream))
            {
                plainText = streamReader.ReadToEnd();
            }
        }
    }
    return plainText;
}

PHP 函数

function string_encrypt($string, $key) {
    $crypted_text = mcrypt_encrypt(
                            MCRYPT_RIJNDAEL_128, 
                            $key, 
                            $string, 
                            MCRYPT_MODE_ECB
                        );
    return base64_encode($crypted_text);
}

function string_decrypt($encrypted_string, $key) {
    return mcrypt_decrypt(
                    MCRYPT_RIJNDAEL_128, 
                    $key, 
                    base64_decode($encrypted_string), 
                    MCRYPT_MODE_ECB
                    );
}

我不太擅长 C#，但我知道 PHP 函数运行良好.因此，必须对 C# 函数进行一些处理.可能是要加密的字符串应该转换为拉丁字符.

I am not so good in C# and I know the PHP function is working fine. So, there must be something done on C# functions. May be the string to be encrypted should converted to Latin chars.

推荐答案

C#默认做Rijndael padding，使用PKCS7.

C# does Rijndael padding by default and uses PKCS7.

这意味着你必须按照 PKCS7 填充你的 PHP 端，下面的代码应该可以工作:

This means you have to pad your PHP side as per PKCS7, code below should work:

function string_encrypt($string, $key) {

  $block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
  $padding = $block - (strlen($string) % $block);
  $string .= str_repeat(chr($padding), $padding);

    $crypted_text = mcrypt_encrypt(
                            MCRYPT_RIJNDAEL_128, 
                            $key, 
                            $string, 
                            MCRYPT_MODE_ECB
                        );
    return base64_encode($crypted_text);
}

有关详细信息，请参阅 first在这里回答

For further information, see the first answer here

我还应该补充一点，如果您想更改 C# 端而不使用填充，请进行以下修改而不是并单独保留 PHP 端:

I should add also, that if you want to change the C# side and not use padding, make the below modification instead and leave the PHP side alone:

static string Encrypt(string plainText, string key)
{
  string cipherText;
  var rijndael = new RijndaelManaged()
  {
    Key = Encoding.UTF8.GetBytes(key),
    Mode = CipherMode.ECB,
    BlockSize = 128,
    Padding = PaddingMode.Zeros,
  };
  ICryptoTransform encryptor = rijndael.CreateEncryptor(rijndael.Key, null);

  using (var memoryStream = new MemoryStream())
  {
    using (var cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
    {
      using (var streamWriter = new StreamWriter(cryptoStream))
      {
        streamWriter.Write(plainText);
        streamWriter.Flush();
      }
      //cipherText = Convert.ToBase64String(Encoding.UTF8.GetBytes(Encoding.UTF8.GetString(memoryStream.ToArray())));
      cipherText = Convert.ToBase64String(memoryStream.ToArray());
      //cryptoStream.FlushFinalBlock();
    }
  }
  return cipherText;
}

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