--对已加密存储过程进行解密的操作步骤:

--1.使用 DAC 与服务器连接

--2.在 SQL Server Management Studio 中,不打开其他 DAC,单击工具栏上的“数据库引擎查询”。 

--3.在“连接到数据库引擎”对话框的“服务器名称”框中,键入 ADMIN:,并在其后继续键入服务器实例的名称。例如,若要连接到名为 ACCT\PAYABLE 的服务器实例,请键入 ADMIN:ACCT\PAYABLE。

--4.完成“身份验证”部分(提供 sysadmin 组成员的凭据),然后单击“连接”。

--5.将建立连接。

--6.如果已在使用 DAC,则连接将失败,并出现错误指示无法连接。--来个完整版的,既能解密存储过程,又能解密函数、触发器、视图.具体代码如下:

create PROCEDURE [dbo].[sp__windbi$decrypt]

(@procedure sysname = NULL, @revfl int = 1)

AS

/*

王成辉翻译整理,转贴请注明出自微软BI开拓者www.windbi.com

目前这个存储过程只能解密存储过程,至于解密函数、触发器、视图的存储过程本网站会进一步关注,调用形式为:

exec dbo.sp__windbi$decrypt @procedure,0

如果第二个参数使用1的话,会给出该存储过程的一些提示。

--版本2.0

*/

SET NOCOUNT ON

IF @revfl = 1

BEGIN

PRINT '警告:该存储过程会删除并重建原始的存储过程。'

PRINT ' 在运行该存储过程之前确保你的数据库有一个备份。'

PRINT ' 该存储过程通常应该运行在产品环境的一个备份的非产品环境下。'

PRINT ' 为了运行这个存储过程,将参数@refl的值更改为0。'

RETURN 0

END

DECLARE @intProcSpace bigint, @t bigint, @maxColID smallint,@intEncrypted 

tinyint,@procNameLength int

select @maxColID = max(subobjid),@intEncrypted = imageval FROM 

sys.sysobjvalues WHERE objid = object_id(@procedure)

GROUP BY imageval

--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 = ''

--提取对象的类型如是存储过程还是函数,如果是触发器,还要得到其父对象的名称

select @objtype=type,@parentname=object_name(parent_object_id)

from sys.objects where [object_id]=object_id(@procedure)

-- 从sys.sysobjvalues里提出加密的imageval记录

SET @real_01=(SELECT top 1 imageval FROM sys.sysobjvalues WHERE objid = 

object_id(@procedure) and valclass = 1 order by subobjid)

--创建一个临时表

create table #output ( [ident] [int] IDENTITY (1, 1) NOT NULL ,

[real_decrypt] NVARCHAR(MAX) )

--开始一个事务,稍后回滚

BEGIN TRAN

--更改原始的存储过程,用短横线替换

if @objtype='P'

  SET @fake_01='ALTER PROCEDURE '+ @procedure +' WITH ENCRYPTION AS 

  '+REPLICATE('-', 40003 - @procNameLength)

else if @objtype='FN'

  SET @fake_01='ALTER FUNCTION '+ @procedure +'() RETURNS INT WITH ENCRYPTION AS BEGIN RETURN 1 

  /*'+REPLICATE('*', datalength(@real_01) /2 - @procNameLength)+'*/ END'

else if @objtype='V'

  SET @fake_01='ALTER view '+ @procedure +' WITH ENCRYPTION AS select 1 as col

  /*'+REPLICATE('*', 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('*', datalength(@real_01) /2 - @procNameLength)+'*/'

EXECUTE (@fake_01)

--从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 

  '+REPLICATE('-', 40003 - @procNameLength)

else if @objtype='FN'

  SET @fake_01='CREATE FUNCTION '+ @procedure +'() RETURNS INT WITH ENCRYPTION AS BEGIN RETURN 1 

  /*'+REPLICATE('*', datalength(@real_01) /2 - @procNameLength)+'*/ END'

else if @objtype='V'

  SET @fake_01='Create view '+ @procedure +' WITH ENCRYPTION AS select 1 as col

  /*'+REPLICATE('*', 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('*', datalength(@real_01) /2 - @procNameLength)+'*/'

--开始计数

SET @intProcSpace=1

--使用字符填充临时变量

SET @real_decrypt_01 = replicate(N'A', (datalength(@real_01) /2 ))

--循环设置每一个变量,创建真正的变量

--每次一个字节

SET @intProcSpace=1

--如有必要,遍历每个@real_xx变量并解密

WHILE @intProcSpace<=(datalength(@real_01)/2)

BEGIN

--真的和假的和加密的假的进行异或处理

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

--通过sp_helptext逻辑向表#output里插入变量

insert #output (real_decrypt) select @real_decrypt_01

-- select real_decrypt AS '#output chek' from #output --测试

-- -------------------------------------

--开始从sp_helptext提取

-- -------------------------------------

declare @dbname sysname

,@BlankSpaceAdded int

,@BasePos int

,@CurrentPos int

,@TextLength int

,@LineId int

,@AddOnLen int

,@LFCR int --回车换行的长度

,@DefinedLength int

,@SyscomText nvarchar(4000)

,@Line nvarchar(255)

Select @DefinedLength = 255

SELECT @BlankSpaceAdded = 0 --跟踪行结束的空格。注意Len函数忽略了多余的空格

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

--获取文本

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

--通过回车查找行的结束

SELECT @CurrentPos = CHARINDEX(char(13)+char(10), @SyscomText, 

@BasePos)

--如果找到回车

IF @CurrentPos != 0

BEGIN

--如果@Lines的长度的新值比设置的大就插入@Lines目前的内容并继续

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

--如果回车没找到

BEGIN

IF @BasePos <= @TextLength

BEGIN

--如果@Lines长度的新值大于定义的长度

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

-- -------------------------------------

--结束从sp_helptext提取

-- -------------------------------------

--删除用短横线创建的存储过程并重建原始的存储过程

ROLLBACK TRAN

DROP TABLE #output