MD5 hashing does not match in C# and PHP

Question

I have tried hashing a string in PHP using MD5 and the same in C#, but the results are different.. can someone explain me how to get this matched?

my C# code looks like

md5 = new MD5CryptoServiceProvider();             originalBytes = ASCIIEncoding.Default.GetBytes(AuthCode);             encodedBytes = md5.ComputeHash(originalBytes);              Guid r = new Guid(encodedBytes);             string hashString = r.ToString("N"); 

Thanks in advance

Edited: My string is 123 as a string

Outputs;

PHP: 202cb962ac59075b964b07152d234b70

C# : 62b92c2059ac5b07964b07152d234b70

Answer 1

Your problem is here:

Guid r = new Guid(encodedBytes); string hashString = r.ToString("N"); 

I'm not sure why you're loading your encoded bytes into a Guid, but that is not the correct way to convert bytes back to a string. Use BitConverter instead:

string testString = "123"; byte[] asciiBytes = ASCIIEncoding.ASCII.GetBytes(testString); byte[] hashedBytes = MD5CryptoServiceProvider.Create().ComputeHash(asciiBytes); string hashedString = BitConverter.ToString(hashedBytes).Replace("-", "").ToLower(); // hashString == 202cb962ac59075b964b07152d234b70 

Answer 2

The solution from Juliet didn't give me the same result as a PHP hash I was comparing against (produced by Magento 1.x), however the following did, based on this implementation on github:

                using (var md5 = MD5.Create())                 {                     result = BitConverter.ToString(md5.ComputeHash(Encoding.UTF8.GetBytes(input)))                         .Replace("-", string.Empty).ToLower();                 }