How can TEA encryption algorithm be implemented in php?

Question

PHP

Hello, I'm trying to implement the TEA encryption method in PHP, but it doesn't work. I found an implementation only in C:

#include <stdint.h>

void encrypt (uint32_t* v, uint32_t* k)
{
    /* set up */
    uint32_t v0 = v[0];
    uint32_t v1 = v[1];
    uint32_t sum = 0;
    uint32_t i;

    /* a key schedule constant */
    uint32_t delta = 0x9e3779b9;

    /* cache key */
    uint32_t k0 = k[0];
    uint32_t k1 = k[1];
    uint32_t k2 = k[2];
    uint32_t k3 = k[3];

    /* basic cycle start */
    for (i = 0; i < 32; i++)
    {
        sum += delta;
        v0 += ((v1 << 4) + k0) ^ (v1 + sum) ^ ((v1 >> 5) + k1);
        v1 += ((v0 << 4) + k2) ^ (v0 + sum) ^ ((v0 >> 5) + k3);
    }
    /* end cycle */

    v[0] = v0;
    v[1] = v1;
}

void decrypt (uint32_t* v, uint32_t* k)
{
    /* set up */
    uint32_t v0 = v[0];
    uint32_t v1 = v[1];
    uint32_t sum = 0xC6EF3720;
    uint32_t i;

    /* a key schedule constant */
    uint32_t delta = 0x9e3779b9;

    /* cache key */
    uint32_t k0 = k[0];
    uint32_t k1 = k[1];
    uint32_t k2 = k[2];
    uint32_t k3 = k[3];        

    /* basic cycle start */
    for (i = 0; i < 32; i++)
    {                              
        v1 -= ((v0 << 4) + k2) ^ (v0 + sum) ^ ((v0 >> 5) + k3);
        v0 -= ((v1 << 4) + k0) ^ (v1 + sum) ^ ((v1 >> 5) + k1);
        sum -= delta;                                   
    }
    /* end cycle */

    v[0] = v0;
    v[1] = v1;
}

I tried to do it by analogy, but in the end the end result does not coincide with the initial one at all.

<?


$key=generatePassword();


function generatePassword($length = 8){
$chars = 'abcdefghijklmnopqrstyzABCDEFGHIJKMNOPQRSTYZ0123456789';
  $numChars = strlen($chars);
  $string = '';
  for ($i = 0; $i < 8; $i++) {
    $string .= substr($chars, rand(1, $numChars) - 1, 1);
  }
  return $string;
}
?>



$text='HelloWorld';




$key0=substr($key, 0, 2);
$key1=substr($key, 2, 2);
$key2=substr($key, 4, 2);
$key3=substr($key, 6, 2);




//$text=base64_encode($text);
//$v['1']=pack('L*', $t2);
$v1=substr($text, 0, 4);
$v2=substr($text, 4, 4);
$encript=block_encrypt($v1, $v2, $key);
$decrypt=block_decrypt($encript['0'], $encript['1'], $key,$encript['sum']);


echo $key.'<br>';
echo $text.'<br>';

print_r($encript);
print_r($decrypt);




//echo $key.'<br>'.$key1.'<br>'.$key2.'<br>'.$key3.'<br>'.$key4;

function block_encrypt($y, $z, $key) {
  $key0=substr($key, 0, 2);
    $key1=substr($key, 2, 2);
      $key2=substr($key, 4, 2);
        $key3=substr($key, 6, 2);
     $sum=0;
     $delta=0x9e3779b9;


     for ($i=0; $i<32; $i++)
        {
        	$sum += $delta;
        	$y += (($z << 4) + $key0) ^ ($z + $sum) ^ (($z >> 5) + $key1);
        $z += (($y << 4) + $key2) ^ ($y + $sum) ^ (($y >> 5) + $key3);
      }

      $v['0'] = $y;
    $v['1'] = $z;
    $v['sum']=$sum;

    return $v;
  }

function block_decrypt($y, $z, $key, $sum) {
  $key0=substr($key, 0, 2);
    $key1=substr($key, 2, 2);
      $key2=substr($key, 4, 2);
        $key3=substr($key, 6, 2);
     
     $delta=0x9e3779b9;


     for ($i=0; $i<32; $i++)
        {
        	
        	$z += (($y << 4) + $key2) ^ ($y + $sum) ^ (($y >> 5) + $key3);
        $y += (($z << 4) + $key0) ^ ($z + $sum) ^ (($z >> 5) + $key1);
        $sum -= $delta;
      }

      $v['0'] = $y;
    $v['1'] = $z;

    return $v;
  }

?>

I will be very grateful.
PS I'm new to programming.

Answer 1

Take the finished implementation and hope it's good: rryqszq4/tea-php