Decryptencryptedstoredprocedures

http://searchdatabase.techtarget.com/tip/1,289483,sid13_gci837799,00.html绿色c hinaip ower. comVg09F

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绿色c hinaip ower. comVg09F

This SP will decrypt Stored Procedures, Views or Triggers that were encrypted using "with encryption". It is adapted from a script by Joseph Gama and ShoeBoy. There are two versions: one for SP's only and the other one for SP's, triggers and views. For version 1, the input is object name (stored procedure, view or trigger), and for version 2, the input is object name (stored procedure, view or trigger), object type ('T'-trigger, 'P'-stored procedure or 'V'-view). From PlanetSourceCode.com.绿色c hinaip ower. comVg09F

create  PROCEDURE sp_decrypt_sp (@objectName varchar(50))



AS



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



declare  @i int , @t bigint







--get encrypted data



SET @OrigSpText1=(SELECT ctext FROM syscomments  WHERE id = object_id(@objectName))



SET @OrigSpText2='ALTER PROCEDURE '  @objectName  ' WITH ENCRYPTION AS ' REPLICATE('-', 3938)



EXECUTE (@OrigSpText2)







SET @OrigSpText3=(SELECT ctext FROM syscomments  WHERE id = object_id(@objectName))



SET @OrigSpText2='CREATE PROCEDURE '  @objectName  ' WITH ENCRYPTION AS ' REPLICATE('-', 4000-62)







--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



execute( @resultsp)



GO

绿色c hinaip ower. comVg09F

Reader Feedback

绿色c hinaip ower. comVg09F

Joakim M. writes: I tried this script with mixed results. It works for some encrypted procedures, but for others I get error meassages like:绿色c hinaip ower. comVg09F

Server: Msg 512, Level 16, State 1, Procedure sp_decrypt_sp, Line 7.



Subquery returned more than 1 value. This is not permitted when the 



subquery follows =, !=, <, <= , >, >= or when the subquery is used as 



an expression.

Karl C writes: I got the same message as Joakim M. but upon further investigation I found that this happens only when stored procedures exceed 4000 characters. When this happens, SQL Server stores the procedure across multiple rows so you get the error 'subquery returne more than 1 row'. To get around that you can change the statement绿色c hinaip ower. comVg09F

SELECT ctext FROM syscomments WHERE id = object_id(@objectName







to 



SELECT top 1 ctext FROM syscomments WHERE id = object_id(@objectName order by colid

That will get you the first part of the stored procedure, which can't be created because it is missing the end part and is not a valid syntax but you can print @resultsp out to see it.绿色c hinaip ower. comVg09F

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