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