Function Auth_OpenID_HMACSHA1
Compute an HMAC/SHA1 hash.
		
		Package: OpenID
Copyright: 2005-2008 Janrain, Inc.
License: Apache
Author: JanRain, Inc. openid@janrain.com
Located at zp-extensions/federated_logon/Auth/OpenID/HMAC.php
	
	Copyright: 2005-2008 Janrain, Inc.
License: Apache
Author: JanRain, Inc. openid@janrain.com
Located at zp-extensions/federated_logon/Auth/OpenID/HMAC.php
string | 
		$key | 
		The HMAC key | 
string | 
		$text | 
		The message text to hash | 
			string
		 | 
		$mac The MAC |