DECLARE @return_value int

EXEC @return_value = [dbo].[sp_undecrypt]
@procedure = testencry,
@revfl = 0

SELECT 'Return Value' = @return_value

GO

1 Create PROCEDURE [dbo].[sp_undecrypt]
2 (@procedure sysname = NULL, @revfl int = 1)
3 AS
4 /**//*
5 王成輝翻譯整理，轉貼請注明出自微軟BI開拓者www.windbi.com
6 調用形式為：
7 exec dbo.sp__windbi$decrypt @procedure,0
8 如果第二個參數(shù)使用1的話，會給出該存儲過程的一些提示。
9 --版本4.0 修正存儲過程過長解密出來是空白的問題
*/
SET NOCOUNT ON
IF @revfl = 1
BEGIN
PRINT '警告：該存儲過程會刪除并重建原始的存儲過程。'
PRINT ' 在運行該存儲過程之前確保你的數(shù)據(jù)庫有一個備份。'
PRINT ' 該存儲過程通常應該運行在產(chǎn)品環(huán)境的一個備份的非產(chǎn)品環(huán)境下。'
PRINT ' 為了運行這個存儲過程，將參數(shù)@refl的值更改為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 = ''
--提取對象的類型如是存儲過程還是函數(shù)，如果是觸發(fā)器，還要得到其父對象的名稱
select @objtype=type,@parentname=object_name(parent_object_id)
from sys.objects where [object_id]=object_id(@procedure)
-- 從sys.sysobjvalues里提出加密的imageval記錄
SET @real_01=(SELECT top 1 imageval FROM sys.sysobjvalues WHERE objid =
object_id(@procedure) and valclass = 1 order by subobjid)

--創(chuàng)建一個臨時表
create table #output ( [ident] [int] IDENTITY (1, 1) NOT NULL ,
[real_decrypt] NVARCHAR(MAX) )
--開始一個事務，稍后回滾
BEGIN TRAN
--更改原始的存儲過程，用短橫線替換
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)
--從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)+'*/'
--開始計數(shù)
SET @intProcSpace=1
--使用字符填充臨時變量
SET @real_decrypt_01 = replicate(cast('A'as nvarchar(max)), (datalength(@real_01) /2 ))
--循環(huán)設置每一個變量，創(chuàng)建真正的變量
--每次一個字節(jié)
SET @intProcSpace=1
--如有必要，遍歷每個@real_xx變量并解密
WHILE @intProcSpace=(datalength(@real_01)/2)
BEGIN
--真的和假的和加密的假的進行異或處理
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


--通過sp_helptext邏輯向表#output里插入變量
insert #output (real_decrypt) select @real_decrypt_01
--select real_decrypt AS '#output chek' from #output --測試
-- -------------------------------------
--開始從sp_helptext提取
-- -------------------------------------
declare @dbname sysname
,@BlankSpaceAdded int
,@BasePos int
,@CurrentPos int
,@TextLength int
,@LineId int
,@AddOnLen int
,@LFCR int --回車換行的長度
,@DefinedLength int
,@SyscomText nvarchar(max)
,@Line nvarchar(255)
Select @DefinedLength = 255
SELECT @BlankSpaceAdded = 0 --跟蹤行結束的空格。注意Len函數(shù)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
--獲取文本
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
--通過回車查找行的結束
SELECT @CurrentPos = CHARINDEX(char(13)+char(10), @SyscomText,
@BasePos)
--如果找到回車
IF @CurrentPos != 0
BEGIN
--如果@Lines的長度的新值比設置的大就插入@Lines目前的內容并繼續(xù)
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
--如果回車沒找到
BEGIN
IF @BasePos = @TextLength
BEGIN
--如果@Lines長度的新值大于定義的長度
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
-- -------------------------------------
--結束從sp_helptext提取
-- -------------------------------------
--刪除用短橫線創(chuàng)建的存儲過程并重建原始的存儲過程
ROLLBACK TRAN
DROP TABLE #output