解密SQL SERVER 2005加密存儲過程，視圖、函數

在SQL SERVER 2005中必須用專用管理連接配接才可以檢視過程過程中用到的表，專用管理連接配接需要在sqlcmd指令後帶參數 -A,

要不然就會出錯，提示 無效的對象名：'sys.sysobjvalues'

Msg 208, Level 16, State 1, Server MICROSOF-A91382\WINCC, Procedure sp_decrypt,

Line 8

Invalid object name 'sys.sysobjvalues'.

步驟：

1、建立sp_decrypt儲存過程，見create PROCEDURE [dbo].[sp_decrypt] 部分

2、使用指令行：

sqlcmd -A -S localhost

>use 資料庫名

>go

>sp_decrypt '加密的對象名'

就顯示加密對象的内容了

//--------------------------------------------------------------------------

create PROCEDURE [dbo].[sp_decrypt] 

(@procedure sysname = NULL) 

AS 

SET NOCOUNT ON 

BEGIN

DECLARE @intProcSpace bigint, @t bigint, @maxColID smallint,@intEncrypted 

tinyint,@procNameLength int 

select @maxColID = max(subobjid),@intEncrypted = imageval FROM 

sys.sysobjvalues WHERE objid = object_id(@procedure) 

GROUP BY imageval

select @procNameLength = datalength(@procedure) + 29 

DECLARE @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 = '' 

--提取對象的類型如是存儲過程還是函數，如果是觸發器，還要得到其父對象的名稱 

select @objtype=type,@parentname=object_name(parent_object_id) 

from sys.objects where [object_id]=object_id(@procedure) 

-- 從sys.sysobjvalues裡提出加密的imageval記錄 

SET @real_01=(SELECT top 1 imageval FROM sys.sysobjvalues WHERE objid = 

object_id(@procedure) and valclass = 1 order by subobjid) 

--建立一個臨時表 

create table #output ( [ident] [int] IDENTITY (1, 1) NOT NULL , 

[real_decrypt] NVARCHAR(MAX) ) 

--開始一個事務，稍後復原 

BEGIN TRAN 

--更改原始的存儲過程，用短橫線替換 

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' 

EXECUTE (@fake_01) 

--從sys.sysobjvalues裡提出加密的假的 

SET @fake_encrypt_01=(SELECT top 1 imageval FROM sys.sysobjvalues WHERE objid = 

object_id(@procedure) and valclass = 1 order by subobjid ) 

SET @fake_01='Create PROCEDURE '+ @procedure +' WITH ENCRYPTION AS 

SET @fake_01='CREATE FUNCTION '+ @procedure +'() RETURNS INT WITH ENCRYPTION AS BEGIN RETURN 1 

SET @fake_01='Create view '+ @procedure +' WITH ENCRYPTION AS select 1 as col 

--開始計數 

SET @intProcSpace=1 

--使用字元填充臨時變量 

SET @real_decrypt_01 = replicate(N'A', (datalength(@real_01) /2 )) 

--循環設定每一個變量，建立真正的變量 

--每次一個位元組 

--如有必要，周遊每個@real_xx變量并解密 

WHILE @intProcSpace<=(datalength(@real_01)/2) 

BEGIN 

--真的和假的和加密的假的進行異或處理 

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+1 

END 

--通過sp_helptext邏輯向表#output裡插入變量 

insert #output (real_decrypt) select @real_decrypt_01 

-- select real_decrypt AS '#output chek' from #output --測試 

-- ------------------------------------- 

--開始從sp_helptext提取 

declare @dbname sysname 

,@BlankSpaceAdded int 

,@BasePos int 

,@CurrentPos int 

,@TextLength int 

,@LineId int 

,@AddOnLen int 

,@LFCR int --回車換行的長度 

,@DefinedLength int 

,@SyscomText nvarchar(4000) 

,@Line nvarchar(255) 

Select @DefinedLength = 255 

SELECT @BlankSpaceAdded = 0 --跟蹤行結束的空格。注意Len函數忽略了多餘的空格 

CREATE TABLE #CommentText 

(LineId int 

,Text nvarchar(255) collate database_default) 

--使用#output代替sys.sysobjvalues 

DECLARE ms_crs_syscom CURSOR LOCAL 

FOR SELECT real_decrypt from #output 

ORDER BY ident 

FOR READ ONLY 

--擷取文本 

SELECT @LFCR = 2 

SELECT @LineId = 1 

OPEN ms_crs_syscom 

FETCH NEXT FROM ms_crs_syscom into @SyscomText 

WHILE @@fetch_status >= 0 

SELECT @BasePos = 1 

SELECT @CurrentPos = 1 

SELECT @TextLength = LEN(@SyscomText) 

WHILE @CurrentPos != 0 

--通過回車查找行的結束 

SELECT @CurrentPos = CHARINDEX(char(13)+char(10), @SyscomText, 

@BasePos) 

--如果找到回車 

IF @CurrentPos != 0 

--如果@Lines的長度的新值比設定的大就插入@Lines目前的内容并繼續 

While (isnull(LEN(@Line),0) + @BlankSpaceAdded + 

@CurrentPos-@BasePos + @LFCR) > @DefinedLength 

SELECT @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 = 0 

SELECT @Line = isnull(@Line, N'') + 

isnull(SUBSTRING(@SyscomText, @BasePos, @CurrentPos-@BasePos + @LFCR), N'') 

SELECT @BasePos = @CurrentPos+2 

INSERT #CommentText VALUES( @LineId, @Line ) 

SELECT @LineId = @LineId + 1 

SELECT @Line = NULL 

ELSE 

--如果回車沒找到 

IF @BasePos <= @TextLength 

--如果@Lines長度的新值大于定義的長度 

@TextLength-@BasePos+1 ) > @DefinedLength 

SELECT @AddOnLen = @DefinedLength - 

(isnull(LEN(@Line),0) + @BlankSpaceAdded) 

@BasePos = @BasePos + @AddOnLen, @BlankSpaceAdded = 

isnull(SUBSTRING(@SyscomText, @BasePos, @TextLength-@BasePos+1 ), N'') 

if LEN(@Line) < @DefinedLength and charindex(' ', 

@SyscomText, @TextLength+1 ) > 0 

SELECT @Line = @Line + ' ', @BlankSpaceAdded = 1 

IF @Line is NOT NULL 

select Text from #CommentText order by LineId 

CLOSE ms_crs_syscom 

DEALLOCATE ms_crs_syscom 

DROP TABLE #CommentText 

--結束從sp_helptext提取 

--删除用短橫線建立的存儲過程并重建原始的存儲過程 

ROLLBACK TRAN 

DROP TABLE #output

END

 本文轉自tiasys部落格園部落格，原文連結：http://www.cnblogs.com/tiasys/archive/2010/08/26/1808947.html，如需轉載請自行聯系原作者