PHP MD5/base64 encryption to C# md5/base64 encryption

I am in the process of try to integrate some C# ASP.NET webservice into my PHP application however there is a big problem. The way the C# webservice does the encryption is not compatible with the way PHP does the MD5 encryption. I have found solution for converting the C# MD5 to PHP MD5 however I can't change the C# code. Is there a way to ch开发者_开发技巧ange the way that PHP does its MD5 encryption to match C#? The c# encryption works like this:

MD5CryptoServiceProvider MD5 = new MD5CryptoServiceProvider();
byte[] bs = System.Text.Encoding.UTF8.GetBytes(stringToEncrypt);
String myString = Convert.ToBase64String(MD5.ComputeHash(bs));

Since MD5 is a published algorithm, the implementations in PHP and c# are identical. The only difference is the string format of the byte sequence they produce. PHP produces a hex string, so you just need to convert from hex to Base64.

This could be an encoding issue. Make sure your PHP version gets the UTF-8 representation of the string, apply MD5, then convert to a base 64 string, and you should be fine.

This is an encoding issue I have had before between PHP and C#.

If PHP is manipulating ISO-8859-1 strings (which is probably your case), you can do:

md5(utf8_encode($stringToEncrypt))

The best way to test is to try a very simple string with a-z content, which should work fine regardless of any encoding issue. It that works and the whole thing doesn't, you have an encoding issue.

You could also do:

byte[] bs = System.Text.Encoding.GetEncoding("ISO-8859-1").GetBytes(stringToEncrypt);

and

md5($stringToEncrypt)

will work just fine.

I see what is your problem:

String myString = Convert.ToBase64String(MD5.ComputeHash(bs)); 

will make a Base64 string out of a pure MD5 array hash.

PHP will first make an hex representation of the MD5 hash then base64-encode it.

You should get the hex result first as described here:

http://blog.stevex.net/c-code-snippet-creating-an-md5-hash-string/

and then base64 encode the string.