8

我已经在两个平台上编写了相同的方法，我认为这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？

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
                    );
}

我在 C# 方面不太好，我知道 PHP 函数工作正常。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。

4

1 回答 1

8

C# 默认使用 Rijndael 填充并使用 PKCS7。

这意味着您必须按照 PKCS7 填充 PHP 端，下面的代码应该可以工作：

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);
}

有关更多信息，请参阅此处的第一个答案

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

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;
}
于 2013-09-20T05:33:53.000 回答