00 - find intentional SHA1 collisions for truncated hashes.txt

Run here:
http://sandbox.onlinephpfunctions.com/

source.php

<?php
        //Enter your code here, enjoy!

function getGUID(){
    if (function_exists('com_create_guid')){
        return com_create_guid();
    }else{
        mt_srand((double)microtime()*10000);//optional for php 4.2.0 and up.
        $charid = strtoupper(md5(uniqid(rand(), true)));
        $hyphen = chr(45);// "-"
        $uuid = chr(123)// "{"
            .substr($charid, 0, 8).$hyphen
            .substr($charid, 8, 4).$hyphen
            .substr($charid,12, 4).$hyphen
            .substr($charid,16, 4).$hyphen
            .substr($charid,20,12)
            .chr(125);// "}"
        return $uuid;
    }
}

function stripGUID()
{
    $temp = getGUID();
    $temp = str_replace("{","", "$temp");
    $temp = str_replace("}","", "$temp");
    $temp = str_replace("-","", "$temp");
    $temp = strtolower($temp);
    return $temp;
}

function myhash($input)
{
    $input = $input . ":magic-string";
    $result = sha1($input);
    return $result;
}


for ($x = 0; $x <= 200000; $x++) {
    $value = stripGUID();
    $hashed = substr(myhash($value), 0, 5);
    if (0 == strcmp($hashed, "8102d")) {
        echo "$value $hashed\n";
        echo "FOUND!\n";
    }
} 

echo "DONE!\n";

?>