MSSQL 存储过程加密解密

最近公司安排我了解一个新项目。这个项目拥有迷一样的代码，当然存储过程也很奇葩,竟然没人知道这里面是什么。不吐槽了，反正也要给他改了。。。。

在执行上面的语句后出现错误：
对象名'sys.sysobjvalues'无效

可以在 文件-新建-数据库引擎查询  用户名那输入  admin:PC201708261115   。  <-------这就是 DAC 链接（管理员链接）

注：我这是在本地数据库执行的

详细了解MSSql DAC http://www.cnblogs.com/RobZH/archive/2016/08/25/5806297.html

解密存储过程来源：http://www.cnblogs.com/echosong/p/5536800.html

Create PROCEDURE [dbo].[sp_windbi$decrypt](@procedure sysname = NULL, @revfl int = 1)AS/**//*王成辉翻译整理，转贴请注明出自微软BI开拓者www.windbi.com调用形式为：exec dbo.sp__windbi$decrypt @procedure,0如果第二个参数使用1的话，会给出该存储过程的一些提示。--版本4.0  修正存储过程过长解密出来是空白的问题*/SET NOCOUNT ONIF @revfl = 1BEGINPRINT '警告：该存储过程会删除并重建原始的存储过程。'PRINT ' 在运行该存储过程之前确保你的数据库有一个备份。'PRINT ' 该存储过程通常应该运行在产品环境的一个备份的非产品环境下。'PRINT ' 为了运行这个存储过程，将参数@refl的值更改为0。'RETURN 0ENDDECLARE @intProcSpace bigint, @t bigint, @maxColID smallint,@procNameLength intselect @maxColID = max(subobjid) FROMsys.sysobjvalues WHERE objid = object_id(@procedure)--select @maxColID as 'Rows in sys.sysobjvalues'select @procNameLength = datalength(@procedure) + 29DECLARE @real_01 nvarchar(max)DECLARE @fake_01 nvarchar(max)DECLARE @fake_encrypt_01 nvarchar(max)DECLARE @real_decrypt_01 nvarchar(max),@real_decrypt_01a nvarchar(max)declare @objtype varchar(2),@ParentName nvarchar(max)select @real_decrypt_01a = ''--提取对象的类型如是存储过程还是函数，如果是触发器，还要得到其父对象的名称select @objtype=type,@parentname=object_name(parent_object_id)from sys.objects where [object_id]=object_id(@procedure)-- 从sys.sysobjvalues里提出加密的imageval记录SET @real_01=(SELECT top 1 imageval FROM sys.sysobjvalues WHERE objid =object_id(@procedure) and valclass = 1 order by subobjid)--创建一个临时表create table #output ( [ident] [int] IDENTITY (1, 1) NOT NULL ,[real_decrypt] NVARCHAR(MAX) )--开始一个事务，稍后回滚BEGIN TRAN--更改原始的存储过程，用短横线替换if @objtype='P'  SET @fake_01='ALTER PROCEDURE '+ @procedure +' WITH ENCRYPTION AS select 1  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/'else if @objtype='FN'  SET @fake_01='ALTER FUNCTION '+ @procedure +'() RETURNS INT WITH ENCRYPTION AS BEGIN RETURN 1  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/ END'else if @objtype='V'  SET @fake_01='ALTER view '+ @procedure +' WITH ENCRYPTION AS select 1 as col  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/'else if @objtype='TR'  SET @fake_01='ALTER trigger '+ @procedure +' ON '+@parentname+'WITH ENCRYPTION AFTER INSERT AS RAISERROR (''N'',16,10)  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/'EXECUTE (@fake_01)--从sys.sysobjvalues里提出加密的假的SET @fake_encrypt_01=(SELECT top 1 imageval FROM sys.sysobjvalues WHERE objid =object_id(@procedure) and valclass = 1 order by subobjid )if @objtype='P'  SET @fake_01='Create PROCEDURE '+ @procedure +' WITH ENCRYPTION AS select 1  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/'else if @objtype='FN'  SET @fake_01='CREATE FUNCTION '+ @procedure +'() RETURNS INT WITH ENCRYPTION AS BEGIN RETURN 1  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/ END'else if @objtype='V'  SET @fake_01='Create view '+ @procedure +' WITH ENCRYPTION AS select 1 as col  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/'else if @objtype='TR'  SET @fake_01='Create trigger '+ @procedure +' ON '+@parentname+'WITH ENCRYPTION AFTER INSERT AS RAISERROR (''N'',16,10)  /**//*'+REPLICATE(cast('*'as nvarchar(max)), datalength(@real_01) /2 - @procNameLength)+'*/'--开始计数SET @intProcSpace=1--使用字符填充临时变量SET @real_decrypt_01 = replicate(cast('A'as nvarchar(max)), (datalength(@real_01) /2 ))--循环设置每一个变量，创建真正的变量--每次一个字节SET @intProcSpace=1--如有必要，遍历每个@real_xx变量并解密WHILE @intProcSpace<=(datalength(@real_01)/2)BEGIN--真的和假的和加密的假的进行异或处理SET @real_decrypt_01 = stuff(@real_decrypt_01, @intProcSpace, 1,NCHAR(UNICODE(substring(@real_01, @intProcSpace, 1)) ^(UNICODE(substring(@fake_01, @intProcSpace, 1)) ^UNICODE(substring(@fake_encrypt_01, @intProcSpace, 1)))))SET @intProcSpace=@intProcSpace+1END--通过sp_helptext逻辑向表#output里插入变量insert #output (real_decrypt) select @real_decrypt_01--select real_decrypt AS '#output chek' from #output --测试-- ---------------------------------------开始从sp_helptext提取-- -------------------------------------declare @dbname sysname,@BlankSpaceAdded int,@BasePos int,@CurrentPos int,@TextLength int,@LineId int,@AddOnLen int,@LFCR int --回车换行的长度,@DefinedLength int,@SyscomText nvarchar(max),@Line nvarchar(255)Select @DefinedLength = 255SELECT @BlankSpaceAdded = 0 --跟踪行结束的空格。注意Len函数忽略了多余的空格CREATE TABLE #CommentText(LineId int,Text nvarchar(255) collate database_default)--使用#output代替sys.sysobjvaluesDECLARE ms_crs_syscom CURSOR LOCALFOR SELECT real_decrypt from #outputORDER BY identFOR READ ONLY--获取文本SELECT @LFCR = 2SELECT @LineId = 1OPEN ms_crs_syscomFETCH NEXT FROM ms_crs_syscom into @SyscomTextWHILE @@fetch_status >= 0BEGINSELECT @BasePos = 1SELECT @CurrentPos = 1SELECT @TextLength = LEN(@SyscomText)WHILE @CurrentPos != 0BEGIN--通过回车查找行的结束SELECT @CurrentPos = CHARINDEX(char(13)+char(10), @SyscomText,@BasePos)--如果找到回车IF @CurrentPos != 0BEGIN--如果@Lines的长度的新值比设置的大就插入@Lines目前的内容并继续While (isnull(LEN(@Line),0) + @BlankSpaceAdded +@CurrentPos-@BasePos + @LFCR) > @DefinedLengthBEGINSELECT @AddOnLen = @DefinedLength-(isnull(LEN(@Line),0) +@BlankSpaceAdded)INSERT #CommentText VALUES( @LineId,isnull(@Line, N'') + isnull(SUBSTRING(@SyscomText,@BasePos, @AddOnLen), N''))SELECT @Line = NULL, @LineId = @LineId + 1,@BasePos = @BasePos + @AddOnLen, @BlankSpaceAdded = 0ENDSELECT @Line = isnull(@Line, N'') +isnull(SUBSTRING(@SyscomText, @BasePos, @CurrentPos-@BasePos + @LFCR), N'')SELECT @BasePos = @CurrentPos+2INSERT #CommentText VALUES( @LineId, @Line )SELECT @LineId = @LineId + 1SELECT @Line = NULLENDELSE--如果回车没找到BEGINIF @BasePos <= @TextLengthBEGIN--如果@Lines长度的新值大于定义的长度While (isnull(LEN(@Line),0) + @BlankSpaceAdded +@TextLength-@BasePos+1 ) > @DefinedLengthBEGINSELECT @AddOnLen = @DefinedLength -(isnull(LEN(@Line),0) + @BlankSpaceAdded)INSERT #CommentText VALUES( @LineId,isnull(@Line, N'') + isnull(SUBSTRING(@SyscomText,@BasePos, @AddOnLen), N''))SELECT @Line = NULL, @LineId = @LineId + 1,@BasePos = @BasePos + @AddOnLen, @BlankSpaceAdded =0ENDSELECT @Line = isnull(@Line, N'') +isnull(SUBSTRING(@SyscomText, @BasePos, @TextLength-@BasePos+1 ), N'')if LEN(@Line) < @DefinedLength and charindex(' ',@SyscomText, @TextLength+1 ) > 0BEGINSELECT @Line = @Line + ' ', @BlankSpaceAdded = 1ENDENDENDENDFETCH NEXT FROM ms_crs_syscom into @SyscomTextENDIF @Line is NOT NULLINSERT #CommentText VALUES( @LineId, @Line )select Text from #CommentText order by LineIdCLOSE ms_crs_syscomDEALLOCATE ms_crs_syscomDROP TABLE #CommentText-- ---------------------------------------结束从sp_helptext提取-- ---------------------------------------删除用短横线创建的存储过程并重建原始的存储过程ROLLBACK TRANDROP TABLE #output

/***************创建加密的存储过程*******************/Create Procedure Proc_test_Encryption with encryptionAS----可以换成任意的逻辑select * from DemoTablego