PHP: Encryption / decryption of passwords

passwords.php

<?php

function encryptPassword($value){
	if(!$value){return false;}
	$text = $value;
	$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
	$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
	$crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, SECRET_KEY, $text, MCRYPT_MODE_ECB, $iv);
	return trim(base64_encode($crypttext)); //encode for cookie
}
		
function decryptPassword($value){
	if(!$value){return false;}
	$crypttext = base64_decode($value); //decode cookie
	$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
	$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
	$decrypttext = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, SECRET_KEY, $crypttext, MCRYPT_MODE_ECB, $iv);
	return trim($decrypttext);
}

?>