（转）对存储过程进行加密和解密(SQL 2008/SQL 2012)

原文地址：http://www.cnblogs.com/wghao/archive/2012/12/30/2837642.html

 

开始：

---

 在网络上，看到有SQL Server 2000和SQL Server 2005 的存储过程加密和解密的方法，后来分析了其中的代码，发现它们的原理都是一样的。后来自己根据实际的应用环境，编写了两个存储过程，一个加密存储过程（sp_EncryptObject），和一个解密存储过程（sp_EncryptObject），它们可以应用于SQL Server中的储过程，函数，视图，以及触发器。

感觉这两个存储过程蛮有意思的，拿来与大家分享；如果你看过类似的，就当作重温一下也好。

 

用于加密的存储过程 （sp_EncryptObject） ：

---

 存储过程（sp_EncryptObject）加密的方法是在存储过程，函数，视图的“As”位置前加上“with encryption”；如果是触发器，就在“for”位置前加“with encryption”。

如果触发器是{ AFTER | INSTEAD OF} 需要修改下面代码"For"位置：

if objectproperty(object_id(@Object),'ExecIsAfterTrigger')=0 set @Replace='As' ; else set @Replace='For ';

存储过程完成代码：

Use master
Go
if object_ID('[sp_EncryptObject]') is not null
    Drop Procedure [sp_EncryptObject]
Go
create procedure sp_EncryptObject 
(
    @Object sysname='All'
)
as
/*
    当@Object=All的时候，对所有的函数，存储过程，视图和触发器进行加密
    调用方法：
    1. Execute sp_EncryptObject 'All'
    2. Execute sp_EncryptObject 'ObjectName'
*/
begin
    set nocount on
    
    if @Object <>'All'
    begin
        if not exists(select 1 from sys.objects a where a.object_id=object_id(@Object) And a.type in('P','V','TR','FN','IF','TF'))
        begin
            --SQL Server 2008
            raiserror 50001 N'无效的加密对象！加密对象必须是函数，存储过程，视图或触发器。'

            --SQL Server 2012
            --throw 50001, N'无效的加密对象！加密对象必须是函数，存储过程，视图或触发器。',1  

            return
        end
        
        if exists(select 1 from sys.sql_modules a where a.object_id=object_id(@Object) and a.definition is null)
        begin
            --SQL Server 2008
            raiserror 50001 N'对象已经加密！'

            --SQL Server 2012
            --throw 50001, N'对象已经加密！',1  
            return
        end
    end
    
    declare @sql nvarchar(max),@C1 nchar(1),@C2 nchar(1),@type nvarchar(50),@Replace nvarchar(50)
    set @C1=nchar(13)
    set @C2=nchar(10)
    
    
    declare cur_Object 
        cursor for 
            select object_name(a.object_id) As ObjectName,a.definition 
                from sys.sql_modules a  
                    inner join sys.objects b on b.object_id=a.object_id
                        and b.is_ms_shipped=0
                        and not exists(select 1 
                                            from sys.extended_properties x
                                            where x.major_id=b.object_id
                                                and x.minor_id=0
                                                and x.class=1
                                                and x.name='microsoft_database_tools_support'
                                        )
                where b.type in('P','V','TR','FN','IF','TF')
                    and (b.name=@Object or @Object='All')
                    and b.name <>'sp_EncryptObject'
                    and a.definition is not null                    
                order by Case 
                            when b.type ='V' then 1 
                            when b.type ='TR' then 2
                            when b.type in('FN','IF','TF') then 3 
                            else 4 end,b.create_date,b.object_id
                
    open cur_Object
    fetch next from cur_Object into @Object,@sql
    while @@fetch_status=0
    begin
        
        Begin Try
                     
            if objectproperty(object_id(@Object),'ExecIsAfterTrigger')=0 set @Replace='As' ; else set @Replace='For ';
                
            if (patindex('%'+@C1+@C2+@Replace+@C1+@C2+'%',@sql)>0)
            begin
                set @sql=Replace(@sql,@C1+@C2+@Replace+@C1+@C2,@C1+@C2+'With Encryption'+@C1+@C2+@Replace+@C1+@C2)
            end
            else if(patindex('%'+@C1+@Replace+@C1+'%',@sql)>0)
            begin 
                set @sql=Replace(@sql,@C1+@Replace+@C1,@C1+'With Encryption'+@C1+@Replace+@C1)
            end
            else if(patindex('%'+@C2+@Replace+@C2+'%',@sql)>0)
            begin 
                set @sql=Replace(@sql,@C2+@Replace+@C2,@C2+'With Encryption'+@C2+@Replace+@C2)
            end
            else if(patindex('%'+@C2+@Replace+@C1+'%',@sql)>0)
            begin 
                set @sql=Replace(@sql,@C2+@Replace+@C1,@C1+'With Encryption'+@C2+@Replace+@C1)
            end
            else if(patindex('%'+@C1+@C2+@Replace+'%',@sql)>0)
            begin 
                set @sql=Replace(@sql,@C1+@C2+@Replace,@C1+@C2+'With Encryption'+@C1+@C2+@Replace)
            end
            else if(patindex('%'+@C1+@Replace+'%',@sql)>0)
            begin 
                set @sql=Replace(@sql,@C1+@Replace,@C1+'With Encryption'+@C1+@Replace)
            end
            else if(patindex('%'+@C2+@Replace+'%',@sql)>0)
            begin 
                set @sql=Replace(@sql,@C2+@Replace,@C2+'With Encryption'+@C2+@Replace)
            end
                    
            set @type =
                case 
                    when object_id(@Object,'P')>0 then 'Proc'
                    when object_id(@Object,'V')>0 then 'View'
                    when object_id(@Object,'TR')>0  then 'Trigger'
                    when object_id(@Object,'FN')>0 or object_id(@Object,'IF')>0 or object_id(@Object,'TF')>0 then 'Function'
                end
            set @sql=Replace(@sql,'Create '+@type,'Alter '+@type)
            
            Begin Transaction
            exec(@sql)            
            print N'已完成加密对象('+@type+')：'+@Object            
            Commit Transaction
            
        End Try
        Begin Catch
            Declare @Error nvarchar(2047)
            Set @Error='Object: '+@Object+@C1+@C2+'Error: '+Error_message()


            Rollback Transaction          
            print @Error
            print @sql   
        End Catch
                    
        fetch next from cur_Object into @Object,@sql
        
    end
    
    close cur_Object
    deallocate cur_Object        
end
 
Go
exec sp_ms_marksystemobject 'sp_EncryptObject' --标识为系统对象
go