C＃加密到解密PHP [英] C# Encryption to PHP Decryption
问题描述
我想要加密在C＃中的一些（饼干）的数据，然后在PHP解密。我选择使用Rijndael加密。我差点它的工作，惟独文本的一部分被解密！我开始从这个例子的工作：解密PHP在C＃中的加密字符串
I'm trying to encrypt some (cookie) data in C# and then decrypt it in PHP. I have chosen to use Rijndael encryption. I've almost got it working, except only part of the text is decrypted! I started working from this example: Decrypt PHP encrypted string in C#
下面的文字，我加密（敏感信息已删除）（JSON）：
Here's the text (JSON) that I am encrypting (sensitive information removed):
{"DisplayName":"xxx", "Username": "yyy", "EmailAddress":"zzz"}
所以，我登录到它创建/编码从存储密钥和IV的饼干，然后重定向到被认为解密/读取cookie的PHP应用程序的C＃应用程序。当我解密的cookie，它出来是这样的：
<击>
So I login to the C# app which creates/encodes the cookie from stored Key and IV and then redirects to the PHP app which is supposed to decrypt/read the cookie. When I decrypt the cookie, it comes out like this:
{"DisplayName":"xxx","F�A ;��HP=D�������4��z����ť���k�#E���R�j�5�\�t. t�D��"
更新：我已经得到了一点点进一步，这是现在的结果。
UPDATE: i've gotten a little bit further and this is now the result
string(96) "{"DisplayName":"xxx","Username":"yyy","EmailAddress"�)ق��-�J��k/VV-v� �9�B`7^"
正如你所看到的，它开始解密它，但后来被搞砸...
As you can see, it starts decrypting it, but then gets messed up...
当解密字符串，它出来正确的（与填充，我有一个函数删除填充），但如果我一个字符改变测试字符串我再次得到垃圾：
When Decrypt the string it comes out correct (with padding, which I have a function to remove padding), but if I change the test string by one character I get garbage again:
B�nHL�Ek �¿?�UΣlO����OЏ�M��NO/�f.M���Lƾ�CC�Y>F��~�qd�+
<击>下面是我用它来生成随机密钥和IV的C＃代码：
更新：我只是用静态密钥/ IV现在，在这里，他们分别是：
UPDATE: I'm just using static key/IV for now, here they are:
Key: lkirwf897+22#bbtrm8814z5qq=498j5
IV: 741952hheeyy66#cs!9hjv887mxx7@8y
<击>
RijndaelManaged symmetricKey = new RijndaelManaged();
symmetricKey.BlockSize = 256;
symmetricKey.KeySize = 256;
symmetricKey.Padding = PaddingMode.Zeros;
symmetricKey.Mode = CipherMode.CBC;
string key = Convert.ToBase64String(symmetricKey.Key);
string IV = Convert.ToBase64String(symmetricKey.IV);
我那么关键和IV保存到数据库中检索。后来换编码/解码
I then save the key and IV to a database to be retrieved later for encoding/decoding.
这是完整的加密类：
public static class Encryption
{
public static string Encrypt(string prm_text_to_encrypt, string prm_key, string prm_iv)
{
var sToEncrypt = prm_text_to_encrypt;
var rj = new RijndaelManaged()
{
Padding = PaddingMode.PKCS7,
Mode = CipherMode.CBC,
KeySize = 256,
BlockSize = 256,
//FeedbackSize = 256
};
var key = Encoding.ASCII.GetBytes(prm_key);
var IV = Encoding.ASCII.GetBytes(prm_iv);
//var key = Convert.FromBase64String(prm_key);
//var IV = Convert.FromBase64String(prm_iv);
var encryptor = rj.CreateEncryptor(key, IV);
var msEncrypt = new MemoryStream();
var csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write);
var toEncrypt = Encoding.ASCII.GetBytes(sToEncrypt);
csEncrypt.Write(toEncrypt, 0, toEncrypt.Length);
csEncrypt.FlushFinalBlock();
var encrypted = msEncrypt.ToArray();
return (Convert.ToBase64String(encrypted));
}
public static string Decrypt(string prm_text_to_decrypt, string prm_key, string prm_iv)
{
var sEncryptedString = prm_text_to_decrypt;
var rj = new RijndaelManaged()
{
Padding = PaddingMode.PKCS7,
Mode = CipherMode.CBC,
KeySize = 256,
BlockSize = 256,
//FeedbackSize = 256
};
var key = Encoding.ASCII.GetBytes(prm_key);
var IV = Encoding.ASCII.GetBytes(prm_iv);
//var key = Convert.FromBase64String(prm_key);
//var IV = Convert.FromBase64String(prm_iv);
var decryptor = rj.CreateDecryptor(key, IV);
var sEncrypted = Convert.FromBase64String(sEncryptedString);
var fromEncrypt = new byte[sEncrypted.Length];
var msDecrypt = new MemoryStream(sEncrypted);
var csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read);
csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length);
return (Encoding.ASCII.GetString(fromEncrypt));
}
public static void GenerateKeyIV(out string key, out string IV)
{
var rj = new RijndaelManaged()
{
Padding = PaddingMode.PKCS7,
Mode = CipherMode.CBC,
KeySize = 256,
BlockSize = 256,
//FeedbackSize = 256
};
rj.GenerateKey();
rj.GenerateIV();
key = Convert.ToBase64String(rj.Key);
IV = Convert.ToBase64String(rj.IV);
}
}
下面是我使用对数据进行解密的PHP代码
Here's the PHP code I am using to decrypt the data:
function decryptRJ256($key,$iv,$string_to_decrypt)
{
$string_to_decrypt = base64_decode($string_to_decrypt);
$rtn = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $string_to_decrypt, MCRYPT_MODE_CBC, $iv);
//$rtn = rtrim($rtn, "\0\4");
$rtn = unpad($rtn);
return($rtn);
}
function unpad($value)
{
$blockSize = mcrypt_get_block_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_CBC);
//apply pkcs7 padding removal
$packing = ord($value[strlen($value) - 1]);
if($packing && $packing < $blockSize){
for($P = strlen($value) - 1; $P >= strlen($value) - $packing; $P--){
if(ord($value{$P}) != $packing){
$packing = 0;
}//end if
}//end for
}//end if
return substr($value, 0, strlen($value) - $packing);
}
$ky = 'lkirwf897+22#bbtrm8814z5qq=498j5'; // 32 * 8 = 256 bit key
$iv = '741952hheeyy66#cs!9hjv887mxx7@8y'; // 32 * 8 = 256 bit iv
$enc = $_COOKIE["MyCookie"];
$dtext = decryptRJ256($ky, $iv, $enc);
var_dump($dtext);
<击>我有点不确定这部分，因为所有的示例代码我已经看到简单的传入直接编码字符串解密以base64，但在我的例子，我不得不BASE64_DECODE它之前，我通过它，否则我得到的错误，关键和IV是不正确的长度。
更新：我使用ASCII键由PHP所需要的格式。如果我生成他们没有在PHP端工作RijndaelManaged类键，但我可以用已知在PHP一边工作，并在RijndaelManaged的C＃端使用它们的密钥。
UPDATE: I'm using ASCII keys in the format needed by PHP. If I generate keys from the RijndaelManaged class they dont work on the PHP side, but I can use keys that are known to work on PHP side and use them in the RijndaelManaged C# side.
请让我知道如果我离开了任何相关信息。 TIA！
Please let me know if I left out any pertinent information. TIA!
推荐答案
由于串被部分确定，但有乱码在结束它会提示加密内的填充问题其中预计256个字节确切的块数。我建议设置填充为 PKCS7 （PaddingMode.PKCS7）代替零C＃的一侧PHP就会明白没有问题（因为它是默认模式上解析器）。
Since the string is partially OK, but there is gibberish at the end it would suggest a padding problem within the encryption which expects exact blocks of 256 bytes. I suggest setting the padding as PKCS7 (PaddingMode.PKCS7) instead of Zeros on the C# side which PHP will understand without issues (as it's the default mode on that parser).
编辑：哎呀，我没有注意到，你有你的PHP以下内容：
Oops, I did not notice that you had the following in your PHP:
$enc = $_COOKIE["MyCookie"];
这是需要注意的。 PHP很可能没有得到加密的数据原样，并运行一些urldecode消毒。你应打印此变量以发现它实际上匹配的是什么从C＃代码发送
This is the caveat. PHP is likely not getting the encrypted data as-is and is running some urldecode sanitizing. You should print this variable to see that it really matches what is being sent from the C# code.
EDIT2：
通过添加此从cookie转换的空白字符丢失+字符：
Convert the whitespaces to missing + characters from the cookie by adding this:
str_replace(' ', '+', $enc);
这篇关于C＃加密到解密PHP的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
