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<?php

if (class_exists('ParagonIE_Sodium_Core_XChaCha20', false)) {
    return;
}
class ParagonIE_Sodium_Core_XChaCha20 extends ParagonIE_Sodium_Core_HChaCha20
{
    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_Core_ChaCha20_Ctx(self::hChaCha20(self::substr($nonce, 0, 16), $key), self::substr($nonce, 16, 8)), str_repeat("\0", $len));
    }
    public static function ietfStream($len = 64, $nonce = '', $key = '')
    {
        if (self::strlen($nonce) !== 24) {
            throw new SodiumException('Nonce must be 24 bytes long');
        }
        return self::encryptBytes(new ParagonIE_Sodium_Core_ChaCha20_IetfCtx(self::hChaCha20(self::substr($nonce, 0, 16), $key), "\0\0\0\0" . self::substr($nonce, 16, 8)), str_repeat("\0", $len));
    }
    public static function streamXorIc($message, $nonce = '', $key = '', $ic = '')
    {
        if (self::strlen($nonce) !== 24) {
            throw new SodiumException('Nonce must be 24 bytes long');
        }
        return self::encryptBytes(new ParagonIE_Sodium_Core_ChaCha20_Ctx(self::hChaCha20(self::substr($nonce, 0, 16), $key), self::substr($nonce, 16, 8), $ic), $message);
    }
    public static function ietfStreamXorIc($message, $nonce = '', $key = '', $ic = '')
    {
        if (self::strlen($nonce) !== 24) {
            throw new SodiumException('Nonce must be 24 bytes long');
        }
        return self::encryptBytes(new ParagonIE_Sodium_Core_ChaCha20_IetfCtx(self::hChaCha20(self::substr($nonce, 0, 16), $key), "\0\0\0\0" . self::substr($nonce, 16, 8), $ic), $message);
    }
}