存储过程解密

Create PROCEDURE [dbo].[sp_windbi$decrypt]  
(@procedure sysname = NULL, @revfl int = 1)  
AS  
SET NOCOUNT ON  
IF @revfl = 1  
BEGIN  
PRINT '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 0  
END  
DECLARE @intProcSpace bigint, @t bigint, @maxColID smallint,@procNameLength int  
select @maxColID = max(subobjid) FROM  
sys.sysobjvalues WHERE objid = object_id(@procedure)  
--select @maxColID as 'Rows in sys.sysobjvalues'   
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+1  
END  
  
  
--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 = 255  
SELECT @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.sysobjvalues   
DECLARE ms_crs_syscom CURSOR LOCAL  
FOR SELECT real_decrypt from #output  
ORDER BY ident  
FOR READ ONLY  
--获取文本   
SELECT @LFCR = 2  
SELECT @LineId = 1  
OPEN ms_crs_syscom  
FETCH NEXT FROM ms_crs_syscom into @SyscomText  
WHILE @@fetch_status >= 0  
BEGIN  
SELECT @BasePos = 1  
SELECT @CurrentPos = 1  
SELECT @TextLength = LEN(@SyscomText)  
WHILE @CurrentPos != 0  
BEGIN  
--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 != 0  
BEGIN  
--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) > @DefinedLength  
BEGIN  
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  
END  
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  
END  
ELSE  
--如果回车没找到   
BEGIN  
IF @BasePos <= @TextLength  
BEGIN  
--如果@Lines长度的新值大于定义的长度   
While (isnull(LEN(@Line),0) + @BlankSpaceAdded +  
@TextLength-@BasePos+1 ) > @DefinedLength  
BEGIN  
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  
END  
SELECT @Line = isnull(@Line, N'') +  
isnull(SUBSTRING(@SyscomText, @BasePos, @TextLength-@BasePos+1 ), N'')  
if LEN(@Line) < @DefinedLength and charindex(' ',  
@SyscomText, @TextLength+1 ) > 0  
BEGIN  
SELECT @Line = @Line + ' ', @BlankSpaceAdded = 1  
END  
END  
END  
END  
FETCH NEXT FROM ms_crs_syscom into @SyscomText  
END  
IF @Line is NOT NULL  
INSERT #CommentText VALUES( @LineId, @Line )  
select Text from #CommentText order by LineId  
CLOSE ms_crs_syscom  
DEALLOCATE ms_crs_syscom  
DROP 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   
ROLL