SQLSERVER中怎么解密存储过程

SQLSERVER中怎么解密存储过程，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。

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加密测试的存储过程

IF EXISTS(SELECT 1 FROM SYSOBJECTS WHERE TYPE='P' AND NAME='P_TEST')

DROP PROCEDURE P_TEST

GO

CREATE PROCEDURE P_TEST(@USERNAME VARCHAR(20),@MSG VARCHAR(20) OUTPUT)

WITH ENCRYPTION

AS

BEGIN

IF(SELECT COUNT(1) FROM Custs WHERE NAME=@USERNAME)>0

SET @MSG='此用户名存在'

ELSE

SET @MSG='此用户名不存在'

END

解密的存储过程

Create PROCEDURE Decryption(@procedure sysname = NULL)

AS

SET NOCOUNT ON

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 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)

--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 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)+'*/'

--开始计数

SET @intProcSpace=1

--使用字符填充临时变量

SET @real_decrypt_01 = replicate(cast('A'as nvarchar(max)), (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) begin="" set="" real_decrypt_01="" intprocspace="@intProcSpace+1" end="" insert="" output="" select="" --select="" real_decrypt="" as="" from="" --="" -------------------------------------="" declare="" dbname="" sysname="" blankspaceadded="0" int="" basepos="" currentpos="" textlength="" lineid="1" addonlen="" lfcr="2" definedlength="255" syscomtext="" line="" create="" table="" commenttext="" text="" collate="" sys.sysobjvalues="" ms_crs_syscom="" cursor="" local="" for="" order="" by="" ident="" read="" only="" open="" fetch="" next="" into="" 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 <= 1="" textlength="" begin="" while="" blankspaceadded=""> @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

GO

启用DAC

SP_CONFIGURE 'remote admin connections';

GO

----0：仅允许本地连接使用 DAC，1：允许远程连接使用 DAC

SP_CONFIGURE 'remote admin connections', 0;

GO

RECONFIGURE WITH OVERRIDE;

GO

文件——>新建——>数据库引擎查询

服务器名称：admin:.或者admin:服务器名称

登录进去执行解密操作

USE TEST

EXEC Decryption P_TEST

GO

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