Geforce File Manager

NAME	SIZE	ACTIONS
📁 ChaCha20		[ DEL ]
📁 Curve25519		[ DEL ]
📁 Poly1305		[ DEL ]
📁 SecretStream		[ DEL ]
📄 BLAKE2b.php	22,324 B	[ EDIT ] \| [ DEL ]
📄 ChaCha20.php	14,511 B	[ EDIT ] \| [ DEL ]
📄 Curve25519.php	132,974 B	[ EDIT ] \| [ DEL ]
📄 Ed25519.php	15,735 B	[ EDIT ] \| [ DEL ]
📄 HChaCha20.php	5,297 B	[ EDIT ] \| [ DEL ]
📄 HSalsa20.php	6,941 B	[ EDIT ] \| [ DEL ]
📄 Int32.php	24,580 B	[ EDIT ] \| [ DEL ]
📄 Int64.php	31,172 B	[ EDIT ] \| [ DEL ]
📄 Poly1305.php	1,586 B	[ EDIT ] \| [ DEL ]
📄 Salsa20.php	11,506 B	[ EDIT ] \| [ DEL ]
📄 SipHash.php	6,613 B	[ EDIT ] \| [ DEL ]
📄 Util.php	209 B	[ EDIT ] \| [ DEL ]
📄 X25519.php	11,042 B	[ EDIT ] \| [ DEL ]
📄 XChaCha20.php	2,454 B	[ EDIT ] \| [ DEL ]
📄 XSalsa20.php	1,379 B	[ EDIT ] \| [ DEL ]

[ CLOSE ]

EDIT: XChaCha20.php

<?php

if (class_exists('ParagonIE_Sodium_Core32_XChaCha20', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core32_XChaCha20
 */
class ParagonIE_Sodium_Core32_XChaCha20 extends ParagonIE_Sodium_Core32_HChaCha20
{
    /**
     * @internal You should not use this directly from another application
     *
     * @param int $len
     * @param string $nonce
     * @param string $key
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function stream($len = 64, $nonce = '', $key = '')
    {
        if (self::strlen($nonce) !== 24) {
            throw new SodiumException('Nonce must be 24 bytes long');
        }
        return self::encryptBytes(
            new ParagonIE_Sodium_Core32_ChaCha20_Ctx(
                self::hChaCha20(
                    self::substr($nonce, 0, 16),
                    $key
                ),
                self::substr($nonce, 16, 8)
            ),
            str_repeat("\x00", $len)
        );
    }

/**
     * @internal You should not use this directly from another application
     *
     * @param string $message
     * @param string $nonce
     * @param string $key
     * @param string $ic
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function streamXorIc($message, $nonce = '', $key = '', $ic = '')
    {
        if (self::strlen($nonce) !== 24) {
            throw new SodiumException('Nonce must be 24 bytes long');
        }
        return self::encryptBytes(
            new ParagonIE_Sodium_Core32_ChaCha20_Ctx(
                self::hChaCha20(self::substr($nonce, 0, 16), $key),
                self::substr($nonce, 16, 8),
                $ic
            ),
            $message
        );
    }

/**
     * @internal You should not use this directly from another application
     *
     * @param string $message
     * @param string $nonce
     * @param string $key
     * @param string $ic
     * @return string
     * @throws SodiumException
     * @throws TypeError
     */
    public static function ietfStreamXorIc($message, $nonce = '', $key = '', $ic = '')
    {
        return self::encryptBytes(
            new ParagonIE_Sodium_Core32_ChaCha20_IetfCtx(
                self::hChaCha20(self::substr($nonce, 0, 16), $key),
                "\x00\x00\x00\x00" . self::substr($nonce, 16, 8),
                $ic
            ),
            $message
        );
    }
}