MsSql数据库存储过程加密解密

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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

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--解密指定存储过程 
exec sp_decrypt '存储过程名' 

create PROCEDURE sp_decrypt(@objectName varchar(50)) 
AS 
begin 
begin tran 
declare @objectname1 varchar(100),@orgvarbin varbinary(8000) 
declare @sql1 nvarchar(4000),@sql2 nvarchar(4000),@sql3 nvarchar(4000),@sql4 nvarchar(4000),@sql5 nvarchar(4000),@sql6 nvarchar(4000),@sql7 nvarchar(4000),@sql8 nvarchar(4000),@sql9 nvarchar(4000),@sql10 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<=@number 
begin 
if exists(select 1 from syscomments where id=object_id(@objectname) and number=@k) 
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' 
set @sql1='ALTER TRIGGER '+@objectname+' ON '+OBJECT_NAME(@parentid)+' WITH ENCRYPTION FOR INSERT AS PRINT 1 ' 

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 '+@objectname+' WITH ENCRYPTION AS SELECT 1 ' 

set @q=len(@sql1) 
set @sql1=@sql1+REPLICATE('-',4000-@q) 
select @sql2=REPLICATE('-',4000),@sql3=REPLICATE('-',4000),@sql4=REPLICATE('-',4000),@sql5=REPLICATE('-',4000),@sql6=REPLICATE('-',4000),@sql7=REPLICATE('-',4000),@sql8=REPLICATE('-',4000),@sql9=REPLICATE('-',4000),@sql10=REPLICATE('-',4000) 
exec(@sql1+@sql2+@sql3+@sql4+@sql5+@sql6+@sql7+@sql8+@sql9+@sql10) 
end 
set @k=@k+1 
end 

set @k=0 
while @k<=@number 
begin 

if exists(select 1 from syscomments where id=object_id(@objectname) and number=@k) 
begin 
select @colid=max(colid) from #temp where number=@k 
set @n=1 

while @n<=@colid 
begin 
select @OrigSpText1=ctext,@encrypted=encrypted,@status=status FROM #temp WHERE colid=@n and number=@k 

SET @OrigSpText3=(SELECT ctext FROM syscomments WHERE id=object_id(@objectName) and colid=@n and number=@k) 
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'--刚才有错改一下 
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' 
set @OrigSpText2='CREATE TRIGGER '+@objectname+' ON '+OBJECT_NAME(@parentid)+' WITH ENCRYPTION FOR INSERT AS PRINT 1 ' 

if @type='V' 
set @OrigSpText2='CREATE VIEW '+@objectname+' WITH ENCRYPTION AS SELECT 1 ' 

set @q=4000-len(@OrigSpText2) 
set @OrigSpText2=@OrigSpText2+REPLICATE('-',@q) 
end 
else 
begin 
SET @OrigSpText2=REPLICATE('-', 4000) 
end 
--start counter 
SET @i=1 
--fill temporary variable 

SET @resultsp = replicate(N'A', (datalength(@OrigSpText1) / 2)) 

--loop 
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 @i=@i+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 
--execute( @resultsp) 
set @n=@n+1 

end 

end 
set @k=@k+1 
end 

drop table #temp 
rollback tran 
end 
GO