What is the equivalent C# method for the PHP "hash_hmac()"?

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C#

.NET

PHP

I have an sample code in php.I need to implement this in c#.I tried the following code for generating signature using HMACSHA1 but I am getting an different values in c# and php code.

Please suggest me an exact hash method in c#.

php code:

<pre>$signature = $this->hexToBase64(hash_hmac("sha1", $string_to_sign, self::SECRET_KEY));  
   
private function hexToBase64($hex){  
$return = "";  
foreach(str_split($hex, 2) as $pair){  
$return .= chr(hexdec($pair));  
}  
return base64_encode($return);  
}  

Quote:

signature: ZToYIGWks4dBLImEKWozVZTkxZc=

What I have tried:

c# code:

var key = Encoding.UTF8.GetBytes(apiKey);  
string signature ;  
using (var hmac = new HMACSHA1(key))  
{  
var hash = hmac.ComputeHash(Encoding.UTF8.GetBytes(message));  
signature = Convert.ToBase64String(hash);  
}  

Quote:

signature: wR/E2jbMo9Y87aqXllcZAynCyRE=