mcrypt_encrypt(): The IV parameter must be as long as the blocksize

[Mystic]

PHP makes a mistake: mcrypt_encrypt(): The IV parameter must be as long as the blocksize

That he doesn't like the vector?

// Ключ
$AES_Key = "93908027539382757893442837120983";
// Вектор

$AES_IV = "33985771209830270358974938292834";
// Методы

function encrypt($string)

{

return base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $AES_Key, addpadding($string), MCRYPT_MODE_CBC, $AES_IV));

}
function addpadding($string, $blocksize = 32)

{

$len = strlen($string);

$pad = $blocksize - ($len % $blocksize);

$string .= str_repeat(chr($pad), $pad);

return $string;

}

The same code on the charpe works perfectly:

// Ключ

private const string AES_Key = "93908027539382757893442837120983";

// Вектор

private const string AES_IV = "33985771209830270358974938292834";
// Зашифровывает строку в AES CBC 256 PKCS7

internal static string AES_Encrypt(string inputStr)

{

byte[] xBuff = null;
     using (var aes = new RijndaelManaged())
     {
          // Настройки
          aes.KeySize = 256;
          aes.BlockSize = 256;
          aes.Padding = PaddingMode.PKCS7;
          aes.Mode = CipherMode.CBC;
          aes.Key = Encoding.UTF8.GetBytes(AES_Key);
          aes.IV = Encoding.UTF8.GetBytes(AES_IV);

          using (var ms = new MemoryStream())
          {
              using (var cs = new CryptoStream(ms, aes.CreateEncryptor(aes.Key, aes.IV), CryptoStreamMode.Write))
              {
                   byte[] textArr = Encoding.UTF8.GetBytes(inputStr);
                   cs.Write(textArr, 0, textArr.Length);
               }

                xBuff = ms.ToArray();
           }
      }

  return Convert.ToBase64String(xBuff);

}

[chanisef]

Working option:

PHP:

// Методы
function encrypt($message)
{
    // Ключ 
    $AES_Key256 = '28937539283712098445739080393827';
// Вектор
$AES_IV = '8574930392882739';

// Алгоритм шифрования
$cipher = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');

if (mcrypt_generic_init($cipher, $AES_Key256, $AES_IV) != -1)
{
    $cipherText = mcrypt_generic($cipher, addpadding($message));
    mcrypt_generic_deinit($cipher);
    return base64_encode($cipherText);
}

}
function addpadding($string, $blocksize = 16)

{

$len = strlen($string);

$pad = $blocksize - ($len % $blocksize);

$string .= str_repeat(chr($pad), $pad);

return $string;

}

C#

// Ключ

private const string AES_Key = "28937539283712098445739080393827";

// Вектор

private const string AES_IV = "8574930392882739";
// Расшифровывает строку из AES 256 CBC PKCS7 из файла

internal static string AES_Decrypt(string inputStr)

{

byte[] xBuff = null;
        using (var aes = new RijndaelManaged())
        {
            // Настройки
            aes.KeySize = 256;
            aes.BlockSize = 128;
            aes.Mode = CipherMode.CBC;
            aes.Padding = PaddingMode.PKCS7;
            aes.Key = Encoding.UTF8.GetBytes(AES_Key);
            aes.IV = Encoding.UTF8.GetBytes(AES_IV);

            using (var ms = new MemoryStream())
            {
                using (var cs = new CryptoStream(ms, aes.CreateDecryptor(), CryptoStreamMode.Write))
                {
                    byte[] textArr = Convert.FromBase64String(inputStr);
                    cs.Write(textArr, 0, textArr.Length);
                }
                xBuff = ms.ToArray();
            }
        }

        return Encoding.UTF8.GetString(xBuff);

}

Article required to understand the principles of AES in PHP: https://www.chilkatsoft.com/p/php_aes.asp