PKCS5.pbkdf2_hmac_sha1(pass, salt, iter, keylen) => string
Class Public methods
Parameters
pass - string
salt - string - should be at least 8 bytes long.
iter - integer - should be greater than 1000. 20000 is
better.
keylen - integer
This method is available in almost any version of OpenSSL.
Conforms to rfc2898.