PHP mcrypt

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Mcrypt was DEPRECATED in PHP 7.1.0, and REMOVED in PHP 7.2.0.

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openssl replacement

public function padZero($data)
{
    $len = 16;
    if (strlen($data) % $len) {
        $padLength = $len - strlen($data) % $len;
        $data .= str_repeat("\0", $padLength);
    }
    return $data;
}

public function AESEncrypt($data, $key = self::DEFAULT_AES_KEY)
{
    $ivsize = openssl_cipher_iv_length('AES-256-CBC');
    $iv = openssl_random_pseudo_bytes($ivsize);

    $options = OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING;
    $encrypted = openssl_encrypt($this->padZero($data), 'AES-256-CBC', $key, $options, $iv);
    return [
        'base64_iv' => base64_encode($iv),
        'base64_encrypted' => base64_encode($encrypted),
    ];
}

public function AESDecrypt($base64_encrypted, $base64_iv, $key = self::DEFAULT_AES_KEY)
{
    $iv = base64_decode($base64_iv);
    $encrypted = base64_decode($base64_encrypted);
    $options = OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING;
    $data = openssl_decrypt($encrypted, 'AES-256-CBC', $key, $options, $iv);
    $data = rtrim($data, chr(0));
    return $data;
}

mcrypt

public function AESEncrypt($data, $key = self::DEFAULT_AES_KEY)
{
    $iv = random_bytes(16);
    $encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $data, MCRYPT_MODE_CBC, $iv);
    return [
        'base64_iv' => base64_encode($iv),
        'base64_encrypted' => base64_encode($encrypted),
    ];
}

public function AESDecrypt($base64_encrypted, $base64_iv, $key = self::DEFAULT_AES_KEY)
{
    $iv = base64_decode($base64_iv);
    $encrypted = base64_decode($base64_encrypted);
    $data = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $encrypted, MCRYPT_MODE_CBC, $iv);
    $data = rtrim($data, chr(0));
    return $data;
}