SQL Server存储函数的加密解密

存储过程、存储函数的加密:with encryption

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　　create procedure dbo.sp_xml_main

　　@table_name nvarchar(260)='',

　　@dirname nvarchar(20)=''

　　with encryption

　　as

　　begin

　　....................................................

　　end

　　go

　　存储过程、存储函数的解密(以下是一位绝世高人编写的代码)

　　if exists (select * from dbo.sysobjects where id = object_id(n'[dbo].[sp_decrypt]') and objectproperty(id, n'isprocedure') = 1)

　　drop procedure [dbo].[sp_decrypt]

　　go

　　/*--破解函数,过程,触发器,视图.仅限于sqlserver2000

　　--作者:j9988--*/

　　/*--调用示例

　　--解密指定存储过程

　　exec sp_decrypt 'appsp_test'

　　--对所有的存储过程解密

　　declare tb cursor for

　　select name from sysobjects where xtype='p' and status>0 and name<>'sp_decrypt'

　　declare @name sysname

　　open tb

　　fetch next from tb into @name

　　while @@fetch_status=0

　　begin

　　print '/*-------存储过程 ['[email protected]+'] -----------*/'

　　exec sp_decrypt @name

　　fetch next from tb into @name

　　end

　　close tb

　　deallocate tb

　　--*/

　　if exists (select * from dbo.sysobjects where id = object_id(n'[dbo].[sp_decrypt]') and objectproperty(id, n'isprocedure') = 1)

　　drop procedure [dbo].[sp_decrypt]

　　go

　　create procedure sp_decrypt(@objectname varchar(50))

　　as

　　begin

　　set nocount on

　　--csdn:j9988 copyright:2004.04.15

　　--v3.1

　　--破解字节不受限制，适用于sqlserver2000存储过程，函数，视图，触发器

　　--修正上一版视图触发器不能正确解密错误

　　--发现有错，请e_mail:[email protected]

　　begin tran

　　declare @objectname1 varchar(100),@orgvarbin varbinary(8000)

　　declare @sql1 nvarchar(4000),@sql2 varchar(8000),@sql3 nvarchar(4000),@sql4 nvarchar(4000)

　　declare @origsptext1 nvarchar(4000), @origsptext2 nvarchar(4000) , @origsptext3 nvarchar(4000), @resultsp nvarchar(4000)

　　declare @i int,@status int,@type varchar(10),@parentid int

　　declare @colid int,@n int,@q int,@j int,@k int,@encrypted int,@number int

　　select @type=xtype,@parentid=parent_obj from sysobjects where id=object_id(@objectname)

　　create table #temp(number int,colid int,ctext varbinary(8000),encrypted int,status int)

　　insert #temp select number,colid,ctext,encrypted,status from syscomments where id = object_id(@objectname)

　　select @number=max(number) from #temp

　　set @k=0

　　while @k<[email protected]

　　begin

　　if exists(select 1 from syscomments where id=object_id(@objectname) and [email protected])

　　begin

　　if @type='p'

　　set @sql1=(case when @number>1 then 'alter procedure '+ @objectname +';'+rtrim(@k)+' with encryption as '

　　else 'alter procedure '+ @objectname+' with encryption as '

　　end)

　　if @type='tr'

　　begin

　　declare @parent_obj varchar(255),@tr_parent_xtype varchar(10)

　　select @parent_obj=parent_obj from sysobjects where id=object_id(@objectname)

　　select @tr_parent_xtype=xtype from sysobjects where [email protected]_obj

　　if @tr_parent_xtype='v'

　　begin

　　set @sql1='alter trigger '[email protected]+' on '+object_name(@parentid)+' with encryption insterd of insert as print 1 '

　　end

　　else

　　begin

　　set @sql1='alter trigger '[email protected]+' on '+object_name(@parentid)+' with encryption for insert as print 1 '

　　end

　　end

　　if @type='fn' or @type='tf' or @type='if'

　　set @sql1=(case @type when 'tf' then

　　'alter function '+ @objectname+'(@a char(1)) returns @b table(a varchar(10)) with encryption as begin insert @b select @a return end '

　　when 'fn' then

　　'alter function '+ @objectname+'(@a char(1)) returns char(1) with encryption as begin return @a end'

　　when 'if' then

　　'alter function '+ @objectname+'(@a char(1)) returns table with encryption as return select @a as a'

　　end)

　　if @type='v'

　　set @sql1='alter view '[email protected]+' with encryption as select 1 as f'

　　set @q=len(@sql1)

　　set @[email protected]+replicate('-',[email protected])

select @sql2=replicate('-',8000)

　　set @sql3='exec(@sql1'

　　select @colid=max(colid) from #temp where [email protected]

　　set @n=1

　　while @n<=ceiling(1.0*(@colid-1)/2) and len(@sql3)<=3996

　　begin

　　set @[email protected]+'[email protected]'

　　set @[email protected]+1

　　end

　　set @[email protected]+')'

　　exec sp_executesql @sql3,n'@sql1 nvarchar(4000),@ varchar(8000)',@[email protected],@[email protected]

　　end

　　set @[email protected]+1

　　end

　　set @k=0

　　while @k<[email protected]

　　begin

　　if exists(select 1 from syscomments where id=object_id(@objectname) and [email protected])

　　begin

　　select @colid=max(colid) from #temp where [email protected]

　　set @n=1

　　while @n<[email protected]

　　begin

　　select @origsptext1=ctext,@encrypted=encrypted,@status=status from #temp where [email protected] and [email protected]

　　set @origsptext3=(select ctext from syscomments where id=object_id(@objectname) and [email protected] and [email protected])

　　if @n=1

　　begin

　　if @type='p'

　　set @origsptext2=(case when @number>1 then 'create procedure '+ @objectname +';'+rtrim(@k)+' with encryption as '

　　else 'create procedure '+ @objectname +' with encryption as '

　　end)

　　if @type='fn' or @type='tf' or @type='if'

　　set @origsptext2=(case @type when 'tf' then

　　'create function '+ @objectname+'(@a char(1)) returns @b table(a varchar(10)) with encryption as begin insert @b select @a return end '

　　when 'fn' then

　　'create function '+ @objectname+'(@a char(1)) returns char(1) with encryption as begin return @a end'

　　when 'if' then

　　'create function '+ @objectname+'(@a char(1)) returns table with encryption as return select @a as a'

　　end)

　　if @type='tr'

　　begin

　　if @tr_parent_xtype='v'

　　begin

　　set @origsptext2='create trigger '[email protected]+' on '+object_name(@parentid)+' with encryption instead of insert as print 1 '

　　end

　　else

　　begin

　　set @origsptext2='create trigger '[email protected]+' on '+object_name(@parentid)+' with encryption for insert as print 1 '

　　end

　　end

　　if @type='v'

　　set @origsptext2='create view '[email protected]+' with encryption as select 1 as f'

　　set @q=4000-len(@origsptext2)

　　set @[email protected]+replicate('-',@q)

　　end

　　else

　　begin

　　set @origsptext2=replicate('-', 4000)

　　end

　　set @i=1

　　set @resultsp = replicate(n'a', (datalength(@origsptext1) / 2))

　　while @i<=datalength(@origsptext1)/2

　　begin

　　set @resultsp = stuff(@resultsp, @i, 1, nchar(unicode(substring(@origsptext1, @i, 1)) ^

　　(unicode(substring(@origsptext2, @i, 1)) ^

　　unicode(substring(@origsptext3, @i, 1)))))

　　set @[email protected]+1

　　end

　　set @orgvarbin=cast(@origsptext1 as varbinary(8000))

　　set @resultsp=(case when @encrypted=1

　　then @resultsp

　　else convert(nvarchar(4000),case when @status&2=2 then uncompress(@orgvarbin) else @orgvarbin end)

　　end)

　　print @resultsp

　　set @[email protected]+1

　　end

　　end

　　set @[email protected]+1

　　end

　　drop table #temp

　　rollback tran

　　end