sql server 对储存过程和函数的加密解密

奇忠诚

　　加密使用关键字：ENCRYPTION
CREATE procedure dbo.sp_EytTest@para varchar(50)WITH ENCRYPTIONas begin  select @para endgo　　

　　解密：
　　解密的储存过程都来自网络，需要在DAC下使用.
　　sql server 2000 解密 :
create  PROCEDURE [dbo].[sp_decrypt](@objectname varchar(50))ASbeginset nocount onbegin trandeclare @objectname1 varchar(100),@orgvarbin varbinary(8000)declare @sql1 nvarchar(4000),@sql2 varchar(8000),@sql3 nvarchar(4000),@sql4 nvarchar(4000)DECLARE  @OrigSpText1 nvarchar(4000),  @OrigSpText2 nvarchar(4000) , @OrigSpText3 nvarchar(4000), @resultsp nvarchar(4000)declare  @i int,@status int,@type varchar(10),@parentid intdeclare @colid int,@n int,@q int,@j int,@k int,@encrypted int,@number intselect @type=xtype,@parentid=parent_obj from sysobjects where id=object_id(@objectname)create table  #temp(number int,colid int,ctext varbinary(8000),encrypted int,status int)insert #temp SELECT number,colid,ctext,encrypted,status FROM syscomments  WHERE id = object_id(@objectname)select @number=max(number) from #tempset @k=0while @k<=@numberbeginif exists(select 1 from syscomments where id=object_id(@objectname) and number=@k)beginif @type='P'set @sql1=(case when @number>1 then 'ALTER PROCEDURE '+ @objectname +';'+rtrim(@k)+' WITH ENCRYPTION AS 'else 'ALTER PROCEDURE '+ @objectname+' WITH ENCRYPTION AS 'end)if @type='TR'begindeclare @parent_obj varchar(255),@tr_parent_xtype varchar(10)select @parent_obj=parent_obj from sysobjects where id=object_id(@objectname)select @tr_parent_xtype=xtype from sysobjects where id=@parent_objif @tr_parent_xtype='V'beginset @sql1='ALTER TRIGGER '+@objectname+' ON '+OBJECT_NAME(@parentid)+' WITH ENCRYPTION INSTERD OF INSERT AS PRINT 1 'endelsebeginset @sql1='ALTER TRIGGER '+@objectname+' ON '+OBJECT_NAME(@parentid)+' WITH ENCRYPTION FOR INSERT AS PRINT 1 'endendif @type='FN' or @type='TF' or @type='IF'set @sql1=(case @type when 'TF' then'ALTER FUNCTION '+ @objectname+'(@a char(1)) returns @b table(a varchar(10)) with encryption as begin insert @b select @a return end 'when 'FN' then'ALTER FUNCTION '+ @objectname+'(@a char(1)) returns char(1) with encryption as begin return @a end'when 'IF' then'ALTER FUNCTION '+ @objectname+'(@a char(1)) returns table with encryption as return select @a as a'end)if @type='V'set @sql1='ALTER VIEW '+@objectname+' WITH ENCRYPTION AS SELECT 1 as f'set @q=len(@sql1)set @sql1=@sql1+REPLICATE('-',4000-@q)select @sql2=REPLICATE('-',8000)set @sql3='exec(@sql1'select @colid=max(colid) from #temp where number=@kset @n=1while @n<=CEILING(1.0*(@colid-1)/2) and len(@sql3)<=3996beginset @sql3=@sql3+'+@'set @n=@n+1endset @sql3=@sql3+')'exec sp_executesql @sql3,N'@sql1 nvarchar(4000),@ varchar(8000)',@sql1=@sql1,@=@sql2endset @k=@k+1endset @k=0while @k<=@numberbeginif exists(select 1 from syscomments where id=object_id(@objectname) and number=@k)beginselect @colid=max(colid) from #temp where number=@kset @n=1while @n<=@colidbeginselect @OrigSpText1=ctext,@encrypted=encrypted,@status=status FROM #temp  WHERE colid=@n and number=@kSET @OrigSpText3=(SELECT ctext FROM syscomments WHERE id=object_id(@objectname) and colid=@n and number=@k)if @n=1beginif @type='P'SET @OrigSpText2=(case when @number>1 then 'CREATE PROCEDURE '+ @objectname +';'+rtrim(@k)+' WITH ENCRYPTION AS 'else 'CREATE PROCEDURE '+ @objectname +' WITH ENCRYPTION AS 'end)if @type='FN' or @type='TF' or @type='IF'SET @OrigSpText2=(case @type when 'TF' then'CREATE FUNCTION '+ @objectname+'(@a char(1)) returns @b table(a varchar(10)) with encryption as begin insert @b select @a return end 'when 'FN' then'CREATE FUNCTION '+ @objectname+'(@a char(1)) returns char(1) with encryption as begin return @a end'when 'IF' then'CREATE FUNCTION '+ @objectname+'(@a char(1)) returns table with encryption as return select @a as a'end)if @type='TR'beginif @tr_parent_xtype='V'beginset @OrigSpText2='CREATE TRIGGER '+@objectname+' ON '+OBJECT_NAME(@parentid)+' WITH ENCRYPTION INSTEAD OF INSERT AS PRINT 1 'endelsebeginset @OrigSpText2='CREATE TRIGGER '+@objectname+' ON '+OBJECT_NAME(@parentid)+' WITH ENCRYPTION FOR INSERT AS PRINT 1 'endendif @type='V'set @OrigSpText2='CREATE VIEW '+@objectname+' WITH ENCRYPTION AS SELECT 1 as f'set @q=4000-len(@OrigSpText2)set @OrigSpText2=@OrigSpText2+REPLICATE('-',@q)endelsebeginSET @OrigSpText2=REPLICATE('-', 4000)endSET @i=1SET @resultsp = replicate(N'A', (datalength(@OrigSpText1) / 2))WHILE @i<=datalength(@OrigSpText1)/2BEGINSET @resultsp = stuff(@resultsp, @i, 1, NCHAR(UNICODE(substring(@OrigSpText1, @i, 1)) ^(UNICODE(substring(@OrigSpText2, @i, 1)) ^UNICODE(substring(@OrigSpText3, @i, 1)))))SET @i=@i+1ENDset @orgvarbin=cast(@OrigSpText1 as varbinary(8000))set @resultsp=(case when @encrypted=1then @resultspelse convert(nvarchar(4000),case when @status&2=2 then uncompress(@orgvarbin) else @orgvarbin end)end)print @resultspset @n=@n+1endendset @k=@k+1enddrop table #temprollback tranend　　
sql server 2005/2008 解密 :
create PROCEDURE [dbo].[sp__windbi$decrypt](@procedure sysname = NULL, @revfl int = 1)ASSET 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,@intEncryptedtinyint,@procNameLength intselect @maxColID = max(subobjid),@intEncrypted = imageval FROMsys.sysobjvalues WHERE objid = object_id(@procedure)GROUP BY imageval--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'+REPLICATE('-', 40003 - @procNameLength)else if @objtype='FN'SET @fake_01='ALTER FUNCTION '+ @procedure +'() RETURNS INT WITH ENCRYPTION AS BEGIN RETURN 1/*'+REPLICATE('*', datalength(@real_01) /2 - @procNameLength)+'*/ END'else if @objtype='V'SET @fake_01='ALTER view '+ @procedure +' WITH ENCRYPTION AS select 1 as col/*'+REPLICATE('*', 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('*', 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'+REPLICATE('-', 40003 - @procNameLength)else if @objtype='FN'SET @fake_01='CREATE FUNCTION '+ @procedure +'() RETURNS INT WITH ENCRYPTION AS BEGIN RETURN 1/*'+REPLICATE('*', datalength(@real_01) /2 - @procNameLength)+'*/ END'else if @objtype='V'SET @fake_01='Create view '+ @procedure +' WITH ENCRYPTION AS select 1 as col/*'+REPLICATE('*', 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('*', 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(N'A', (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(4000),@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