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<?php
/*
* cram_md5_sasl_client.php
*
* @(#) $Id: cram_md5_sasl_client.php,v 1.3 2004/11/17 08:00:37 mlemos Exp $
*
*/
define("SASL_CRAM_MD5_STATE_START", 0);
define("SASL_CRAM_MD5_STATE_RESPOND_CHALLENGE", 1);
define("SASL_CRAM_MD5_STATE_DONE", 2);
class cram_md5_sasl_client_class
{
var $credentials=array();
var $state=SASL_CRAM_MD5_STATE_START;
Function Initialize(&$client)
{
return(1);
}
Function HMACMD5($key,$text)
{
$key=(strlen($key)<64 ? str_pad($key,64,"\0") : substr($key,0,64));
return(md5((str_repeat("\x5c", 64)^$key).pack("H32", md5((str_repeat("\x36", 64)^$key).$text))));
}
Function Start(&$client, &$message, &$interactions)
{
if($this->state!=SASL_CRAM_MD5_STATE_START)
{
$client->error="CRAM-MD5 authentication state is not at the start";
return(SASL_FAIL);
}
$this->credentials=array(
"user"=>"",
"password"=>""
);
$defaults=array();
$status=$client->GetCredentials($this->credentials,$defaults,$interactions);
if($status==SASL_CONTINUE)
$this->state=SASL_CRAM_MD5_STATE_RESPOND_CHALLENGE;
Unset($message);
return($status);
}
Function Step(&$client, $response, &$message, &$interactions)
{
switch($this->state)
{
case SASL_CRAM_MD5_STATE_RESPOND_CHALLENGE:
$message=$this->credentials["user"]." ".$this->HMACMD5($this->credentials["password"], $response);
$this->state=SASL_CRAM_MD5_STATE_DONE;
break;
case SASL_CRAM_MD5_STATE_DONE:
$client->error="CRAM-MD5 authentication was finished without success";
return(SASL_FAIL);
default:
$client->error="invalid CRAM-MD5 authentication step state";
return(SASL_FAIL);
}
return(SASL_CONTINUE);
}
};
?>
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