Test script for AES-256-CTR in PHP

<?
function convBase($numberInput, $fromBaseInput, $toBaseInput) {
  // FROM PHP.NET         [email protected]
  if ($fromBaseInput==$toBaseInput) return $numberInput;
    $fromBase = str_split($fromBaseInput,1);
    $toBase = str_split($toBaseInput,1);
    $number = str_split($numberInput,1);
    $fromLen=strlen($fromBaseInput);
    $toLen=strlen($toBaseInput);
    $numberLen=strlen($numberInput);
    $retval='';
    if($toBaseInput == '0123456789') {
      $retval=0;
      for($i = 1; $i <= $numberLen; $i++) {
        $retval = bcadd($retval,
                    bcmul(array_search($number[$i-1], $fromBase), bcpow($fromLen,$numberLen-$i))
                  );
      }
      return $retval;
    }
    if($fromBaseInput != '0123456789') {
      $base10 = convBase($numberInput, $fromBaseInput, '0123456789');
    }
    else
    $base10 = $numberInput;
    if ($base10<strlen($toBaseInput)) {
      return $toBase[$base10];
    }
    while($base10 != '0')
    {
      $retval = $toBase[bcmod($base10,$toLen)].$retval;
      $base10 = bcdiv($base10,$toLen,0);
    }
  return $retval;
}
function binToFullkey($raw) {
  return convBase(bin2hex($raw), '0123456789abcdef',
        '!"#$%^\'()+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~');
  // All printable ASCII characters
}
function randomChars($len) {
  // 94-character keyspace
  $l = ceil($len * 5 / 6);
  return substr(binToFullkey(openssl_random_pseudo_bytes($l)), 0, $len);
}
error_reporting(E_ALL);
ini_set('display_errors', E_ALL|E_NOTICE|E_STRICT);
header("Content-Type: text/plain");
function AES_256_CTR_Encrypt($plain, $key, $IV) {
  return trim(
           base64_encode(
             mcrypt_encrypt(
               MCRYPT_RIJNDAEL_256,
               $key,
               $plain,
               'ctr',
               $IV
             )
           )
         );
}
function AES_256_CTR_Decrypt($cipher, $key, $IV) {
  return trim(
           mcrypt_decrypt(
             MCRYPT_RIJNDAEL_256,
             $key,
             base64_decode($cipher),
             'ctr',
             $IV
           )
         );
}
################################################################################
# Testing AES-256-CTR in PHP                                                   #
################################################################################
$plain = randomChars(1024);
$key = openssl_random_pseudo_bytes(32);
$IV = openssl_random_pseudo_bytes(32);
echo "AES-256-CTR Mode test!\n";
echo "Plaintext:\n\t".chunk_split($plain, 40, "\n\t")."\n";
echo "Key: ".base64_encode($key)."\n";
echo "IV: ".base64_encode($IV)."\n";
echo "======================================================================\n";
echo "Encrypted:\n\t";
$ctext = AES_256_CTR_Encrypt($plain, $key, $IV);
echo chunk_split($ctext, 40, "\n\t");
echo "\nDecrypted:\n\t";
$ptext = AES_256_CTR_Decrypt($ctext, $key, $IV);
echo chunk_split($ptext, 40, "\n\t");
echo "\nNo fatal errors? Hooray!";
?>