Decrypt SQL Server 2005 Stored Procedures stored proc
VJ
I found this Stored Proc on the internet and thought I should post it
here so may be someone can fix it for the longer and much bigger stored
procs. This works fine if you have a smaller stored procs. I have a
stored proc that has probably close to 60,000 characters in it and this
solution works for stored proc that has less than 4000 characters (may
be 3900). Any help will be highly appreciated.
/*-----------------------------------
----------------------------------
---To use this code you have to be DAC on the sql server.
-----------------------------------
-----------------------------------*/
CREATE PROCEDURE dbo.sp__procedure$decrypt
(@procedure sysname = NULL, @revfl int = 1)
AS
SET NOCOUNT ON
IF @revfl = 1
BEGIN
PRINT 'CAUTION: THIS PROCEDURE DELETES AND REBUILDS THE ORIGINAL
STORED
PROCEDURE.'
PRINT ' MAKE A BACKUP OF YOUR DATABASE BEFORE RUNNING THIS
PROCEDURE.'
PRINT ' IDEALLY, THIS PROCEDURE SHOULD BE RUN ON A NON-PRODUCTION
COPY
OF THE PROCEDURE.'
PRINT ' To run the procedure, change the @revfl parameter to 0'
RETURN 0
END
DECLARE @intProcSpace bigint, @t bigint, @maxColID
smallint,@intEncrypted
tinyint,@procNameLength int
select @maxColID = max(subobjid)
--,@intEncrypted = encrypted
FROM
sys.sysobjvalues WHERE objid = object_id(@procedure)
--GROUP BY encrypted
--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)
select @real_decrypt_01a = ''
-- extract the encrypted imageval rows from sys.sysobjvalues
SET @real_01=(SELECT imageval FROM sys.sysobjvalues WHERE objid =
object_id(@procedure) and valclass = 1 and subobjid = 1 )
-- create this table for later use
create table #output ( [ident] [int] IDENTITY (1, 1) NOT NULL ,
[real_decrypt] NVARCHAR(MAX) )
-- We'll begin the transaction and roll it back later
BEGIN TRAN
-- alter the original procedure, replacing with dashes
SET @fake_01='ALTER PROCEDURE '+ @procedure +' WITH ENCRYPTION AS
'+REPLICATE('-', 40003 - @procNameLength)
EXECUTE (@fake_01)
-- extract the encrypted fake imageval rows from sys.sysobjvalues
SET @fake_encrypt_01=(SELECT imageval FROM sys.sysobjvalues WHERE objid
=
object_id(@procedure) and valclass = 1 and subobjid = 1)
SET @fake_01='CREATE PROCEDURE '+ @procedure +' WITH ENCRYPTION AS
'+REPLICATE('-', 40003 - @procNameLength)
--start counter
SET @intProcSpace=1
--fill temporary variable with with a filler character
SET @real_decrypt_01 = replicate(N'A', (datalength(@real_01) /2 ))
--loop through each of the variables sets of variables, building the
real variable
--one byte at a time.
SET @intProcSpace=1
-- Go through each @real_xx variable and decrypt it, as necessary
WHILE @intProcSpace<=(datalength(@real_01)/2)
BEGIN
--xor real & fake & fake encrypted
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
-- Load the variables into #output for handling by sp_helptext logic
insert #output (real_decrypt) select @real_decrypt_01
-- select real_decrypt AS '#output chek' from #output -- Testing
-- -------------------------------------
-- Beginning of extract from sp_helptext
-- -------------------------------------
declare @dbname sysname
,@BlankSpaceAdded int
,@BasePos int
,@CurrentPos int
,@TextLength int
,@LineId int
,@AddOnLen int
,@LFCR int --lengths of line feed carriage return
,@DefinedLength int
,@SyscomText nvarchar(4000)
,@Line nvarchar(255)
Select @DefinedLength = 255
SELECT @BlankSpaceAdded = 0
--Keeps track of blank spaces at end of lines. Note Len function
ignores trailing blank spaces
CREATE TABLE #CommentText
(LineId int
,Text nvarchar(255) collate database_default)
-- use #output instead of sys.sysobjvalues
DECLARE ms_crs_syscom CURSOR LOCAL
FOR SELECT real_decrypt from #output
ORDER BY ident
FOR READ ONLY
-- Else get the text.
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
--Looking for end of line followed by carriage return
SELECT @CurrentPos = CHARINDEX(char(13)+char(10),
@SyscomText,
@BasePos)
--If carriage return found
IF @CurrentPos != 0
BEGIN
--If new value for @Lines length will be > then the
--set length then insert current contents of @line
--and proceed.
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
--else carriage return not found
BEGIN
IF @BasePos <= @TextLength
BEGIN
--If new value for @Lines length will be > then the
--defined length
--
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
-- -------------------------------------
-- End of extract from sp_helptext
-- -------------------------------------
-- Drop the procedure that was setup with dashes and rebuild it with
the good stuff
-- Version 1.1 mod; makes rebuilding hte proc unnecessary
ROLLBACK TRAN
DROP TABLE #output
GO
SET QUOTED_IDENTIFIER OFF
GO
SET ANSI_NULLS ON
GO