API Consumer ID & Consumer secret generator

functions.php

<?php

function gen_oauth_creds() {
    // Get a whole bunch of random characters from the OS
    $fp = fopen('/dev/urandom','rb');
    $entropy = fread($fp, 32);
    fclose($fp);

    // Takes our binary entropy, and concatenates a string which represents the current time to the microsecond
    $entropy .= uniqid(mt_rand(), true);

    // Hash the binary entropy
    $hash = hash('sha512', $entropy);

    // Base62 Encode the hash, resulting in an 86 or 85 character string
    $hash = base64_encode($hash);

    // Chop and send the first 80 characters back to the client
    return array(
        'consumer_key' => substr($hash, 0, 32),
        'shared_secret' => substr($hash, 32, 48)
    );
}