C# equivalent to hash_hmac in PHP

Question

using .NET and C# i need to provide an integrity string using HMAC SHA512 to a PHP server . Using in C# :

Encoding encoding = Encoding.UTF8;
byte[] keyByte          


        

Answer 1

As said upper, the problem was with PHP Pack(H* function used to convert key to byte array. C# Getbytes doesn't give the same result (utf8, asci, unicode...). The solution found here : http://www.nuronconsulting.com/c-pack-h.aspx was ok for me. now HMAC from C# match with PHP !

public static byte[] PackH(string hex)
{
       if ((hex.Length % 2) == 1) hex += '0';
       byte[] bytes = new byte[hex.Length / 2];
       for (int i = 0; i < hex.Length; i += 2)
       {
             bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);
       }
 return bytes;
}

Manu thanks to all for your help.