mcrypt_enc_self_test
    (PHP 4 >= 4.0.2)
mcrypt_enc_self_test -- This function runs a self test on the opened module
Description
bool 
mcrypt_enc_self_test ( resource td)
     This function runs the self test on the algorithm specified by the      descriptor td. If the self test succeeds it returns FALSE. In case      of an error, it returns TRUE.