ParagonIE_Sodium_Compat::crypto_stream_xchacha20_xor_ic( string $message, string $nonce, int $counter, string $key, bool $dontFallback = false ): string

3621    public static function crypto_stream_xchacha20_xor_ic(3622        #[\SensitiveParameter]3623        $message,3624        $nonce,3625        $counter,3626        #[\SensitiveParameter]3627        $key,3628        $dontFallback = false3629    ) {3630        /* Type checks: */3631        ParagonIE_Sodium_Core_Util::declareScalarType($message, 'string', 1);3632        ParagonIE_Sodium_Core_Util::declareScalarType($nonce, 'string', 2);3633        ParagonIE_Sodium_Core_Util::declareScalarType($counter, 'int', 3);3634        ParagonIE_Sodium_Core_Util::declareScalarType($key, 'string', 4);3635 3636        /* Input validation: */3637        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_STREAM_XCHACHA20_NONCEBYTES) {3638            throw new SodiumException('Argument 2 must be CRYPTO_SECRETBOX_XCHACHA20_NONCEBYTES long.');3639        }3640        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_STREAM_XCHACHA20_KEYBYTES) {3641            throw new SodiumException('Argument 3 must be CRYPTO_SECRETBOX_XCHACHA20_KEYBYTES long.');3642        }3643 3644        if (is_callable('sodium_crypto_stream_xchacha20_xor_ic') && !$dontFallback) {3645            return sodium_crypto_stream_xchacha20_xor_ic($message, $nonce, $counter, $key);3646        }3647 3648        $ic = ParagonIE_Sodium_Core_Util::store64_le($counter);3649        if (PHP_INT_SIZE === 4) {3650            return ParagonIE_Sodium_Core32_XChaCha20::streamXorIc($message, $nonce, $key, $ic);3651        }3652        return ParagonIE_Sodium_Core_XChaCha20::streamXorIc($message, $nonce, $key, $ic);3653    }