使用PHP和c＃的Mcrypt和base64

Question

我已經在兩個平台上編寫了相同的方法，我認為這些方法應該會產生相同的結果，但它並沒有發生。 我用相同的密鑰加密了相同的文本，結果不同。 有人能弄明白為什么會這樣嗎？

字符串： 這是測試

密鑰： 1234567812345678

PHP加密字符串： ybUaKwQlRNwOjJhxLWtLYQ ==

C＃加密字符串： r2YjEFPyDDacnPmDFcGTLA ==

C＃功能

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函數

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
                    );
}

我在C＃中不是很好，我知道PHP函數運行正常。 所以，必須在C＃函數上做一些事情。 可能是要加密的字符串應轉換為拉丁字符。

Answer 1

C＃默認使用Rijndael填充並使用PKCS7。

這意味着你必須根據PKCS7填充你的PHP端，下面的代碼應該工作：

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);
}

有關詳細信息，請參閱此處的第一個答案

我還應該補充一點，如果你想改變C＃方面而不是使用填充，請改為進行以下修改並留下PHP方面：

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;
}