解密SQL SERVER 2005加密存储过程，函数

在SQL SERVER 2005中必须用专用管理连接才可以查看过程过程中用到的表

EG：sqlcmd -A

1>use test

2>go

1>sp_decrypt 'p_testa'

2>go

Text
----------------------
Create procedure P_testa

with encryption

as

select * from test

create PROCEDURE [ dbo ] . [ sp_decrypt ]
( @procedure sysname = NULL )
AS
SET NOCOUNT ON
BEGIN
DECLARE @intProcSpace bigint , @t bigint , @maxColID smallint , @intEncrypted
tinyint , @procNameLength int
select @maxColID = max (subobjid), @intEncrypted = imageval FROM
sys.sysobjvalues WHERE objid = object_id ( @procedure )
GROUP BY imageval

select @procNameLength = datalength ( @procedure ) + 29
DECLARE @real_01 nvarchar ( max )
DECLARE @fake_01 nvarchar ( max )
DECLARE @fake_encrypt_01 nvarchar ( max )
DECLARE @real_decrypt_01 nvarchar ( max ), @real_decrypt_01a nvarchar ( max )
declare @objtype varchar ( 2 ), @ParentName nvarchar ( max )
select @real_decrypt_01a = ''
-- 提取对象的类型如是存储过程还是函数，如果是触发器，还要得到其父对象的名称
select @objtype = type, @parentname = object_name (parent_object_id)
from sys.objects where [ object_id ] = object_id ( @procedure )
-- 从sys.sysobjvalues里提出加密的imageval记录
SET @real_01 = ( SELECT top 1 imageval FROM sys.sysobjvalues WHERE objid =
object_id ( @procedure ) and valclass = 1 order by subobjid)
-- 创建一个临时表
create table #output( [ ident ] [ int ] IDENTITY ( 1 , 1 ) NOT NULL ,
[ real_decrypt ] NVARCHAR ( MAX ))
-- 开始一个事务，稍后回滚
BEGIN TRAN
-- 更改原始的存储过程，用短横线替换
if @objtype = ' P '
SET @fake_01 = ' ALTERPROCEDURE ' + @procedure + ' WITHENCRYPTIONAS
' + REPLICATE ( ' - ' , 40003 - @procNameLength )
else if @objtype = ' FN '
SET @fake_01 = ' ALTERFUNCTION ' + @procedure + ' ()RETURNSINTWITHENCRYPTIONASBEGINRETURN1
/* ' + REPLICATE ( ' * ' , datalength ( @real_01 ) / 2 - @procNameLength ) + ' */END '
else if @objtype = ' V '
SET @fake_01 = ' ALTERview ' + @procedure + ' WITHENCRYPTIONASselect1ascol
/* ' + REPLICATE ( ' * ' , datalength ( @real_01 ) / 2 - @procNameLength ) + ' */ '
else if @objtype = ' TR '
SET @fake_01 = ' ALTERtrigger ' + @procedure + ' ON ' + @parentname + ' WITHENCRYPTIONAFTERINSERTASRAISERROR( '' N '' ,16,10)
/* ' + REPLICATE ( ' * ' , datalength ( @real_01 ) / 2 - @procNameLength ) + ' */ '
EXECUTE ( @fake_01 )
-- 从sys.sysobjvalues里提出加密的假的
SET @fake_encrypt_01 = ( SELECT top 1 imageval FROM sys.sysobjvalues WHERE objid =
object_id ( @procedure ) and valclass = 1 order by subobjid)
if @objtype = ' P '
SET @fake_01 = ' CreatePROCEDURE ' + @procedure + ' WITHENCRYPTIONAS
' + REPLICATE ( ' - ' , 40003 - @procNameLength )
else if @objtype = ' FN '
SET @fake_01 = ' CREATEFUNCTION ' + @procedure + ' ()RETURNSINTWITHENCRYPTIONASBEGINRETURN1
/* ' + REPLICATE ( ' * ' , datalength ( @real_01 ) / 2 - @procNameLength ) + ' */END '
else if @objtype = ' V '
SET @fake_01 = ' Createview ' + @procedure + ' WITHENCRYPTIONASselect1ascol
/* ' + REPLICATE ( ' * ' , datalength ( @real_01 ) / 2 - @procNameLength ) + ' */ '
else if @objtype = ' TR '
SET @fake_01 = ' Createtrigger ' + @procedure + ' ON ' + @parentname + ' WITHENCRYPTIONAFTERINSERTASRAISERROR( '' N '' ,16,10)
/* ' + REPLICATE ( ' * ' , datalength ( @real_01 ) / 2 - @procNameLength ) + ' */ '
-- 开始计数
SET @intProcSpace = 1
-- 使用字符填充临时变量
SET @real_decrypt_01 = replicate (N ' A ' ,( datalength ( @real_01 ) / 2 ))
-- 循环设置每一个变量，创建真正的变量
-- 每次一个字节
SET @intProcSpace = 1
-- 如有必要，遍历每个@real_xx变量并解密
WHILE @intProcSpace <= ( datalength ( @real_01 ) / 2 )
BEGIN
-- 真的和假的和加密的假的进行异或处理
SET @real_decrypt_01 = stuff ( @real_decrypt_01 , @intProcSpace , 1 ,
NCHAR ( UNICODE ( substring ( @real_01 , @intProcSpace , 1 )) ^
( UNICODE ( substring ( @fake_01 , @intProcSpace , 1 )) ^
UNICODE ( substring ( @fake_encrypt_01 , @intProcSpace , 1 )))))
SET @intProcSpace = @intProcSpace + 1
END
-- 通过sp_helptext逻辑向表#output里插入变量
insert #output(real_decrypt) select @real_decrypt_01
-- selectreal_decryptAS'#outputchek'from#output--测试
-- -------------------------------------
-- 开始从sp_helptext提取
-- -------------------------------------
declare @dbname sysname
, @BlankSpaceAdded int
, @BasePos int
, @CurrentPos int
, @TextLength int
, @LineId int
, @AddOnLen int
, @LFCR int -- 回车换行的长度
, @DefinedLength int
, @SyscomText nvarchar ( 4000 )
, @Line nvarchar ( 255 )
Select @DefinedLength = 255
SELECT @BlankSpaceAdded = 0 -- 跟踪行结束的空格。注意Len函数忽略了多余的空格
CREATE TABLE #CommentText
(LineId int
, Text nvarchar ( 255 )collatedatabase_default)
-- 使用#output代替sys.sysobjvalues
DECLARE ms_crs_syscom CURSOR LOCAL
FOR SELECT real_decrypt from #output
ORDER BY ident
FOR READ ONLY
-- 获取文本
SELECT @LFCR = 2
SELECT @LineId = 1
OPEN ms_crs_syscom
FETCH NEXT FROM ms_crs_syscom into @SyscomText
WHILE @@fetch_status >= 0
BEGIN
SELECT @BasePos = 1
SELECT @CurrentPos = 1
SELECT @TextLength = LEN ( @SyscomText )
WHILE @CurrentPos != 0
BEGIN
-- 通过回车查找行的结束
SELECT @CurrentPos = CHARINDEX ( char ( 13 ) + char ( 10 ), @SyscomText ,
@BasePos )
-- 如果找到回车
IF @CurrentPos != 0
BEGIN
-- 如果@Lines的长度的新值比设置的大就插入@Lines目前的内容并继续
While ( isnull ( LEN ( @Line ), 0 ) + @BlankSpaceAdded +
@CurrentPos - @BasePos + @LFCR ) > @DefinedLength
BEGIN
SELECT @AddOnLen = @DefinedLength - ( isnull ( LEN ( @Line ), 0 ) +
@BlankSpaceAdded )
INSERT #CommentText VALUES
( @LineId ,
isnull ( @Line ,N '' ) + isnull ( SUBSTRING ( @SyscomText ,
@BasePos , @AddOnLen ),N '' ))
SELECT @Line = NULL , @LineId = @LineId + 1 ,
@BasePos = @BasePos + @AddOnLen , @BlankSpaceAdded = 0
END
SELECT @Line = isnull ( @Line ,N '' ) +
isnull ( SUBSTRING ( @SyscomText , @BasePos , @CurrentPos - @BasePos + @LFCR ),N '' )
SELECT @BasePos = @CurrentPos + 2
INSERT #CommentText VALUES ( @LineId , @Line )
SELECT