存储过程加密解密

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

Use master
Go
if object_ID(‘[sp_DecryptObject]‘) is not null
    Drop Procedure [sp_DecryptObject]
Go
create procedure sp_DecryptObject
(
    @Object sysname,    --要解密的对象名：函数，存储过程，视图或触发器
    @MaxLength int=4000 --评估内容的长度
)
as
set nocount on
/* 1. 解密 */

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‘无效的对象！要解密的对象必须是函数，存储过程，视图或触发器。‘ 

    --SQL Server 2012
    --throw 50001, N‘无效的对象！要解密的对象必须是函数，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 not null)
begin
    --SQL Server 2008
    raiserror 50001 N‘对象没有加密！‘ 

    --SQL Server 2012
    --throw 50001, N‘无效的对象！要解密的对象必须是函数，存储过程，视图或触发器。‘,1
    return
end

declare  @sql nvarchar(max)                --解密出来的SQL语句
        ,@imageval nvarchar(max)        --加密字符串
        ,@tmpStr nvarchar(max)            --临时SQL语句
        ,@tmpStr_imageval nvarchar(max) --临时SQL语句(加密后)
        ,@type char(2)                    --对象类型(‘P‘,‘V‘,‘TR‘,‘FN‘,‘IF‘,‘TF‘)
        ,@objectID int                    --对象ID
        ,@i int                            --While循环使用
        ,@Oject1 nvarchar(1000)

set @objectID=object_id(@Object)
set @type=(select a.type from sys.objects a where a.object_id=@objectID)

declare @Space4000 nchar(4000)
set @Space4000=replicate(‘-‘,4000)

/*
@tmpStr 会构造下面的SQL语句
-------------------------------------------------------------------------------
alter trigger Tr_Name on Table_Name with encryption for update as return /**/
alter proc Proc_Name with encryption  as select 1 as col /**/
alter view View_Name with encryption as select 1 as col /**/
alter function Fn_Name() returns int with encryption as begin return(0) end/**/
*/
set @Oject1=quotename(object_schema_name(@objectID))+‘.‘+quotename(@Object)
set @tmpStr=
        case
            when @type =‘P ‘ then N‘Alter Procedure ‘+@Oject1+‘ with encryption as select 1 as column1 ‘
            when @type =‘V ‘ then N‘Alter View ‘+@Oject1+‘ with encryption as select 1 as column1 ‘
            when @type =‘FN‘ then N‘Alter Function ‘+@Oject1+‘() returns int with encryption as begin return(0) end ‘
            when @type =‘IF‘ then N‘Alter Function ‘+@Oject1+‘() returns table with encryption as return(Select a.name from sys.types a) ‘
            when @type =‘TF‘ then N‘Alter Function ‘+@Oject1+‘() returns @t table(name nvarchar(50)) with encryption as begin return end ‘
            else ‘Alter Trigger ‘+@Oject1+‘on ‘+quotename(object_schema_name(@objectID))+‘.‘+(select Top(1) quotename(object_name(parent_id)) from sys.triggers a where a.object_id=@objectID)+‘ with encryption for update as return ‘
        end        

set @tmpStr=@tmpStr+‘/*‘+@Space4000
set @i=0
while @i < (ceiling(@MaxLength*1.0/4000)-1)
begin
    set @tmpStr=@tmpStr+ @Space4000
    Set @i=@i+1
end
set @tmpStr=@tmpStr+‘*/‘

------------
set @imageval =(select top(1) a.imageval from sys.sysobjvalues a where a.objid=@objectID and a.valclass=1)

begin tran
exec(@tmpStr)
set @tmpStr_imageval =(select top(1) a.imageval from sys.sysobjvalues a where a.objid=@objectID and a.valclass=1)

rollback tran

-------------
set @tmpStr=stuff(@tmpStr,1,5,‘create‘)
set @sql=‘‘
set @i=1
while @i<= (datalength(@imageval)/2)
begin
    set @sql=@sql+isnull(nchar(unicode(substring(@tmpStr,@i,1)) ^ unicode(substring(@tmpStr_imageval,@i,1))^unicode(substring(@imageval,@i,1)) ),‘‘)
    Set @i+=1
end

/* 2. 列印 */

declare @patindex int
while @sql>‘‘
begin

    set @patindex=patindex(‘%‘+char(13)+char(10)+‘%‘,@sql)
    if @patindex >0
    begin
        print substring(@sql,1,@patindex-1)
        set @sql=stuff(@sql,1,@patindex+1,‘‘)
    end
    else
    begin
        set @patindex=patindex(‘%‘+char(13)+‘%‘,@sql)
        if @patindex >0
        begin
            print substring(@sql,1,@patindex-1)
            set @sql=stuff(@sql,1,@patindex,‘‘)
        end
        else
        begin
            set @patindex=patindex(‘%‘+char(10)+‘%‘,@sql)
            if @patindex >0
            begin
                print substring(@sql,1,@patindex-1)
                set @sql=stuff(@sql,1,@patindex,‘‘)
            end
            else
            begin
                print @sql
                set @sql=‘‘
            end
        end
    end

end

Go
exec sp_ms_marksystemobject ‘sp_DecryptObject‘ --标识为系统对象
go