问题
I'm trying to set up password salting on our website, and found the PBKDF2 functions at https://defuse.ca/php-pbkdf2.htm
When I try it, I get:
Fatal error: mcrypt_create_iv(): Could not gather sufficient random data in include\PBKDF2.php on line 23
I'm not sure if I need to do anything to make this work. It's running on IIS7.5
回答1:
For those who are still facing error:
Fatal Error: Call to undefined function mcrypt_create_iv()
Please check the phpversion and correspondingly make sure to go to php.ini file and add the line or uncomment:
extension=php_mcrypt.dll
I was able to get solution from here http://tech.domainstack.in/how-to-enable-mcrypt-on-the-server/
回答2:
I was using PHP 5.3.6, which apparently has a bug with mcrypt_create_iv().
Switched to the latest version 5.4.7 and it started working.
来源：https://stackoverflow.com/questions/12534802/using-mcrypt-create-iv-on-php-iis