[doctorow]

I found the needed snipped from a SHA1 implementation for PHP:

Use

$eax = (int)(zerofill($eax, 0x0c));

instead of

$eax = (int)(eax >> 0x0c);

and define the following function:

PHP Code:

function zeroFill($a, $b)
{
    $z = hexdec(80000000);
        if ($z & $a)
        {
            $a >>= 1;
            $a &= (~$z);
            $a |= 0x40000000;
            $a >>= ($b-1);
        }
        else
        {
            $a >>= $b;
        }
        return $a;
}