C＃md5 Hash和Php

Question

I have encrypt a string in c# with md5 hash and stored it to mysql database with code below.

function getMd5Hash(string md5)
{
    string md5;
    MD5 md5hash = new MD5CryptoServiceProvider();
    md5hash.ComputeHash(ASCIIEncoding.ASCII.GetBytes(pass));
    byte[] result = md5hash.Hash;

    StringBuilder strbuilder = new StringBuilder();
    for (int i = 0; i < result.Length; i++)
    {
        strbuilder.Append(result[i].ToString("x2"));
    }
    md5 = strbuilder.ToString();
}

//salt is ten random character
string pass = getMd5Hash(getMd5Hash("fermentasi")+salt);

Now, how can I hashing same string in PHP to get match value with my function in c# ? I have been searching but didn't find a solution so far. Thanks for Helping and sorry for my bad english :)

Answer 1

I recently came across this same issue and found a pretty good resource here. We were also trying to encrypt an item from a PHP form, store it in MySQL and hopefully decrypt it in (and for use in) a C# application. It uses AES which is much more secure than MD5 as well. Here is a snipet of my PHP code

function encrypt($text) {

    $iv = "45287112549354892144548565456541";
    $key = "anjueolkdiwpoida";

    $block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_CBC);

    $crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_CBC, $iv]);


    $crypttext64=base64_encode($crypttext);

    return $crypttext64;

}

function decrypt ($text) {

    $iv = "45287112549354892144548565456541";
    $key = "anjueolkdiwpoida";

    $crypttext64=base64_decode($text);

    $decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_256 ,  $key,  $crypttext64 ,  MCRYPT_MODE_CBC, $key );

    return $decrypted;

}

So all you need to do is call encrypt($text_to_encrypt) before storing it in the database, and you can call decrypt($encrypted_text) to take it back out. However, as I was only on the PHP side, you might need to refer to the previous link to see what goes into decrypting it on the C# side. Apologies for only a half-answer.

And this will only work if you have control of the C# too and you have the option of moving away from the MD5.