<?php
    $td = new Mcrypt('tripledes', 'cfb');

    echo $td->name;

    echo $td->is_block_algorithm;
    echo $td->block_size;

    echo $td->iv_size;
    echo $td->key_size;

    $iv = $td->generate_iv();
    /* or */
    $iv = mcrypt::creat_iv($size);
    $td->set_iv($iv);

    $td->set_key('secret_key', MCRYPT_HASH); /* or MCRYPT_PAD */

    $td->init(); /* optional, only required for multiple encryptions */
    $crypt = $td->encrypt('secret text');

    $td = NULL;
?>