SQL里的加密的内容怎么解密的？急！！

[smydamozhilong]

我在sql里的某个字段加了密，比如内容aaa加密后变成678ds6。那么我想对她解密，请问咋办？

[dawugui]

这个难搞,以下是些加密解密的东西,自己参考.

--参考:
下面给出了一个存储过程，它的作用是自动将当前数据库的用户存储过程加密。
DECLARE @sp_name nvarchar(400)
DECLARE @sp_content nvarchar(2000)
DECLARE @asbegin int
declare @now datetime
select @now = getdate()
DECLARE sp_cursor CURSOR FOR 
SELECT object_name(id)
FROM sysobjects
WHERE xtype = 'P' 
AND type = 'P' 
AND crdate < @now
AND OBJECTPROPERTY(id, 'IsMSShipped')=0
OPEN sp_cursor
FETCH NEXT FROM sp_cursor 
INTO @sp_name
WHILE @@FETCH_STATUS = 0
BEGIN
SELECT @sp_content = text FROM syscomments WHERE id = OBJECT_ID(@sp_name) 
SELECT @asbegin = PATINDEX ( '%AS' + char(13) + '%', @sp_content) 
SELECT @sp_content = SUBSTRING(@sp_content, 1, @asbegin - 1) 
+ ' WITH ENCRYPTION AS'
+ SUBSTRING (@sp_content, @asbegin+2, LEN(@sp_content))
SELECT @sp_name = 'DROP PROCEDURE [' + @sp_name + ']'
EXEC sp_executesql @sp_name 
EXEC sp_executesql @sp_content
FETCH NEXT FROM sp_cursor 
INTO @sp_name
END
CLOSE sp_cursor 
DEALLOCATE sp_cursor
该存储过程利用了 sysobjects 和 syscomments 表，并巧妙地修改了原存储过程的 SQL 定义语句，将 AS 修改为了 WITH ENCRYPTION AS，从而达到了加密存储过程的目的。本存储过程在 SQL Server 2000 上通过。

[dawugui]

存储过程解密(破解函数,过程,触发器,视图.仅限于SQLSERVER2000) 

--*/ 

/*--调用示例: 

--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 
  

[hexiaoling]

2种办法解密
1、加密和解密算法一般都是成对的，如果有解密函数，那就调用你的解密函数 解密
2、反推，直到你的加密内容a，直接加密后得到b，那就你知道b解密后就是a了（这个只能算是投机取巧，正规的还是1）

[中国风]

SQL05
可用專用管理員連接 (DAC)，在存儲過程論壇已有了；樓主在baidu上找找

[smydamozhilong]

好的，谢谢了

[中国风]

我在sql里的某个字段加了密，比如内容aaa加密后变成678ds6。那么我想对她解密，请问咋办

字段內容需要知道加密方法，再可做解密。可也定議函數。。可用05的加密功能（這個暫時沒見到可解密的）

[Kwater]

mark

[claro]

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