I am Using AES ECB 256 padding - Encryption to send data , but Decryption i am not able to achieve

Question

I am sending data to API and They uses Java Function, I Replicated Encryption in PHP but I am unable to Decrypt Response Data.

I tried Various Encryption but They Strictly Use this Encryption Decryption, I cannot Change Encryption I had to follow this.

Encryption Function Works Properly:

function encrypt($input, $key) {
        $size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
        $input = pkcs5_pad($input, $size);
        $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');
        $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
        mcrypt_generic_init($td, $key, $iv);
        $data = mcrypt_generic($td, $input);
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
        $data = base64_encode($data);
        return $data;
    }

    function pkcs5_pad($text, $blocksize) {
        $pad = $blocksize - (strlen($text) % $blocksize);
        return $text . str_repeat(chr($pad), $pad);
    }

Decryption Function I tried:

function decrypt($sStr, $sKey) {
        $decrypted = mcrypt_decrypt(
                MCRYPT_RIJNDAEL_128, $sKey, base64_decode($sStr), MCRYPT_MODE_ECB
        );
        $dec_s = strlen($decrypted);
        $padding = ord($decrypted[$dec_s - 1]);
        $decrypted = substr($decrypted, 0, -$padding);
        return $decrypted;
    }

As an Output I am Getting ??? which is wrong Encryption.

Do not Duplicate this As I have Searched More than 3 hours, then I posted Question.

Answer 1

function decrypt($sStr, $sKey) {
        $decrypted = mcrypt_decrypt(
                MCRYPT_RIJNDAEL_128, $sKey, base64_decode($sStr), MCRYPT_MODE_ECB
        );
        $dec_s = strlen($decrypted);
        $padding = ord($decrypted[$dec_s - 1]);
        $decrypted = substr($decrypted, 0, -$padding);
        $decrypted = base64_encode($decrypted );    //This line Added.
        return $decrypted;
    }

I was getting Byte format I wasn't converting the data into base64_encode, Now It is Working.