Sql存储过程解密方法

在网上查到这样一个存储过程解密的方法，用起来简单，收藏到这里：

 1 CREATE     PROCEDURE   sp_decrypt_sp   (@objectName   varchar(50))  

 2   AS  

 3   ------------------------sql2000大于40000的-----------------  

 4   --原作：j9988   号:J老师  

 5    

 6   begin   tran  

 7   begin  

 8   declare   @objectname1   varchar(100)  

 9   declare   @sql1   nvarchar(4000),@sql2   nvarchar(4000),@sql3   nvarchar(4000),@sql4   nvarchar(4000),@sql5   nvarchar(4000),@sql6   nvarchar(4000),@sql7   nvarchar(4000),@sql8   nvarchar(4000),@sql9   nvarchar(4000),@sql10   nvarchar(4000)      

10   DECLARE     @OrigSpText1   nvarchar(4000),     @OrigSpText2   nvarchar(4000)   ,   @OrigSpText3   nvarchar(4000),   @resultsp   nvarchar(4000)  

11   declare     @i   int   ,   @t   bigint  

12   declare   @m   int,@n   int,@q   int  

13   set   @m=(SELECT   max(colid)   FROM   syscomments     WHERE   id   =   object_id(@objectName))  

14   set   @n=1  

15   --get   encrypted   data  

16   create   table     #temp(colid   int,ctext   varbinary(8000))  

17   insert   #temp   SELECT   colid,ctext   FROM   syscomments     WHERE   id   =   object_id(@objectName)  

18   set   @sql1='ALTER   PROCEDURE   '+   @objectName   +'   WITH   ENCRYPTION   AS   '  

19   --set   @sql1='ALTER   PROCEDURE   '+   @objectName   +'   WITH   ENCRYPTION   AS   '  

20   set   @q=len(@sql1)  

21   set   @sql1=@sql1+REPLICATE('-',4000-@q)  

22   select   @sql2=REPLICATE('-',4000),@sql3=REPLICATE('-',4000),@sql4=REPLICATE('-',4000),@sql5=REPLICATE('-',4000),@sql6=REPLICATE('-',4000),@sql7=REPLICATE('-',4000),@sql8=REPLICATE('-',4000),@sql9=REPLICATE('-',4000),@sql10=REPLICATE('-',4000)  

23   exec(@sql1+@sql2+@sql3+@sql4+@sql5+@sql6+@sql7+@sql8+@sql9+@sql10)  

24   while   @n<=@m  

25   begin  

26   SET   @OrigSpText1=(SELECT   ctext   FROM   #temp     WHERE   colid=@n)  

27   set   @objectname1=@objectname+'_t'  

28   SET   @OrigSpText3=(SELECT   ctext   FROM   syscomments   WHERE   id=object_id(@objectName)   and   colid=@n)  

29   if   @n=1  

30   begin  

31   SET   @OrigSpText2='CREATE   PROCEDURE   '+   @objectName   +'   WITH   ENCRYPTION   AS   '--  

32   set   @q=4000-len(@OrigSpText2)  

33   set   @OrigSpText2=@OrigSpText2+REPLICATE('-',@q)  

34   end  

35   else  

36   begin  

37   SET   @OrigSpText2=REPLICATE('-',   4000)  

38   end  

39   --start   counter  

40   SET   @i=1  

41   --fill   temporary   variable  

42   SET   @resultsp   =   replicate(N'A',   (datalength(@OrigSpText1)   /   2))  

43    

44   --loop  

45   WHILE   @i<=datalength(@OrigSpText1)/2  

46   BEGIN  

47   --reverse   encryption   (XOR   original+bogus+bogus   encrypted)  

48   SET   @resultsp   =   stuff(@resultsp,   @i,   1,   NCHAR(UNICODE(substring(@OrigSpText1,   @i,   1))   ^  

49                                                                   (UNICODE(substring(@OrigSpText2,   @i,   1))   ^  

50                                                                   UNICODE(substring(@OrigSpText3,   @i,   1)))))  

51           SET   @i=@i+1  

52   END  

53   --drop   original   SP  

54   --EXECUTE   ('drop   PROCEDURE   '+   @objectName)  

55   --remove   encryption  

56   --preserve   case  

57   SET   @resultsp=REPLACE((@resultsp),'WITH   ENCRYPTION',   '')  

58   SET   @resultsp=REPLACE((@resultsp),'With   Encryption',   '')  

59   SET   @resultsp=REPLACE((@resultsp),'with   encryption',   '')  

60   IF   CHARINDEX('WITH   ENCRYPTION',UPPER(@resultsp)   )>0    

61       SET   @resultsp=REPLACE(UPPER(@resultsp),'WITH   ENCRYPTION',   '')  

62   --replace   Stored   procedure   without   enryption  

63   print   @resultsp  

64   --execute(   @resultsp)  

65   set   @n=@n+1  

66   end  

67   drop   table   #temp  

68   end  

69   rollback   tran  

70   --适合40000字符。  

71   --每次4000　print出来，自已贴。  

72   --切记：我见过的解过程都是对原过程进行破坏。破解前一定要备份!!!!  

73   --超过40000的，自已加SQL（我上面用SQL.SQL2－－SQL10）  

74   --超长的可加SQL11--sql20........  

75    

76    

77   GO