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小技巧:解密SQL2000的存储过程

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发表于 2009-1-15 08:32:00 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式

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  drop procedure sp_decrypt   go   create PROCEDURE sp_decrypt (@objectName varchar(50))   AS   begin      begin transaction --add by playyuer      declare @objectname1 varchar(100)   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)   DECLARE @OrigSpText1 nvarchar(4000), @OrigSpText2 nvarchar(4000) , @OrigSpText3 nvarchar(4000), @resultsp nvarchar(4000)   declare @i int , @t bigint   declare @m int,@n int,@q int   set @m=(SELECT max(colid) FROM syscomments WHERE id = object_id(@objectName))   set @n=1   --get encrypted data   create table #temp(colid int,ctext varbinary(8000))   insert #temp SELECT colid,ctext FROM syscomments WHERE id = object_id(@objectName)   set @sql1='ALTER PROCEDURE ' @objectName ' WITH ENCRYPTION AS '   --set @sql1='ALTER PROCEDURE ' @objectName ' WITH ENCRYPTION AS '   set @q=len(@sql1)   set @sql1=@sql1 REPLICATE('-',4000-@q)   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)   exec(@sql1 @sql2 @sql3 @sql4 @sql5 @sql6 @sql7 @sql8 @sql9 @sql10)   while @n<=@m   begin   SET @OrigSpText1=(SELECT ctext FROM #temp WHERE colid=@n)   set @objectname1=@objectName '_t'   SET @OrigSpText3=(SELECT ctext FROM syscomments WHERE id=object_id(@objectName) and colid=@n)   if @n=1   begin   SET @OrigSpText2='CREATE PROCEDURE ' @objectName ' WITH ENCRYPTION AS '--   set @q=4000-len(@OrigSpText2)   set @OrigSpText2=@OrigSpText2 REPLICATE('-',@q)   end   else   begin   SET @OrigSpText2=REPLICATE('-', 4000)   end   --start counter   SET @i=1   --fill temporary variable   SET @resultsp = replicate(N'A', (datalength(@OrigSpText1) / 2))      --loop   WHILE @i<=datalength(@OrigSpText1)/2   BEGIN   --reverse encryption (XOR original bogus bogus encrypted)   SET @resultsp = stuff(@resultsp, @i, 1, NCHAR(UNICODE(substring(@OrigSpText1, @i, 1)) ^   (UNICODE(substring(@OrigSpText2, @i, 1)) ^   UNICODE(substring(@OrigSpText3, @i, 1)))))   SET @i=@i 1   END   --drop original SP   --EXECUTE ('drop PROCEDURE ' @objectName)   --remove encryption   --preserve case   SET @resultsp=REPLACE((@resultsp),'WITH ENCRYPTION', '')   SET @resultsp=REPLACE((@resultsp),'With Encryption', '')   SET @resultsp=REPLACE((@resultsp),'with encryption', '')   IF CHARINDEX('WITH ENCRYPTION',UPPER(@resultsp) )>0   SET @resultsp=REPLACE(UPPER(@resultsp),'WITH ENCRYPTION', '')   --replace Stored procedure without enryption   print @resultsp   --execute( @resultsp)   set @n=@n 1   end   drop table #temp   end   rollback transaction --add by playyuer   GO <
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