SQL解密ctext字段内容函数

--SQL解密ctext字段内容函数
--exec sp_decrypt '约束名称'
--exec sp_decrypt 'DF_InsuranceRecord_PeriodUnit'
--exec sp_decrypt '存储过程名称'
--exec sp_decrypt 'sp_SearchPrinting_InsuranceRecord'

--主要用途:读取systemcomments中的字段内容。包括约束,存储过程等等。

--原文应该来自http://blog.csdn.net/j9988/archive/2004/04/16/16747.aspx,作者发布文章只有3篇,可能转了移BLOG.不过确实是高手。省却了我很多的时间。本来打算先找OX字符传格式的破解函数,或者在C#中解密的viabanry(8000)字段内容。

--存在存储 过程超过4000时候会换行的一些评论中反映的问题。出现错误我会及时修正。

CREATE  PROCEDURE sp_decrypt(@objectName varchar(50)) 
AS 
begin 
set nocount on 

begin tran 
declare @objectname1 varchar(100),@orgvarbin varbinary(8000) 
declare @sql1 nvarchar(4000),@sql2 varchar(8000),@sql3 nvarchar(4000),@sql4 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' 
begin 
declare @parent_obj varchar(255),@tr_parent_xtype varchar(10) 
select @parent_obj=parent_obj from sysobjects where id=object_id(@objectName) 
select @tr_parent_xtype=xtype from sysobjects where id=@parent_obj 
if @tr_parent_xtype='V' 
begin 
set @sql1='ALTER TRIGGER '+@objectname+' ON '+OBJECT_NAME(@parentid)+' WITH ENCRYPTION INSTERD OF INSERT AS PRINT 1 ' 
end 
else 
begin 
set @sql1='ALTER TRIGGER '+@objectname+' ON '+OBJECT_NAME(@parentid)+' WITH ENCRYPTION FOR INSERT AS PRINT 1 ' 
end 
 
end 
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 as f' 
 
set @q=len(@sql1) 
set @sql1=@sql1+REPLICATE('-',4000-@q) 
select @sql2=REPLICATE('-',8000) 
set @sql3='exec(@sql1' 
select @colid=max(colid) from #temp where number=@k  
set @n=1 
while @n<=CEILING(1.0*(@colid-1)/2) and len(@sQL3)<=3996 
begin  
set @sql3=@sql3+'+@' 
set @n=@n+1 
end 
set @sql3=@sql3+')' 
exec sp_executesql @sql3,N'@Sql1 nvarchar(4000),@ varchar(8000)',@sql1=@sql1,@=@sql2 
 
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' 
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'  
begin 
 
if @tr_parent_xtype='V' 
begin 
set @OrigSpText2='CREATE TRIGGER '+@objectname+' ON '+OBJECT_NAME(@parentid)+' WITH ENCRYPTION INSTEAD OF INSERT AS PRINT 1 ' 
end 
else 
begin 
set @OrigSpText2='CREATE TRIGGER '+@objectname+' ON '+OBJECT_NAME(@parentid)+' WITH ENCRYPTION FOR INSERT AS PRINT 1 ' 
end 
 
end 
 
if @type='V' 
set @OrigSpText2='CREATE VIEW '+@objectname+' WITH ENCRYPTION AS SELECT 1 as f' 
 
set @q=4000-len(@OrigSpText2) 
set @OrigSpText2=@OrigSpText2+REPLICATE('-',@q) 
end 
else 
begin 
SET @OrigSpText2=REPLICATE('-', 4000) 
end 
SET @i=1 
 
SET @resultsp = replicate(N'A', (datalength(@OrigSpText1) / 2)) 
 
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 
 
set @n=@n+1 
 
end 
 
end 
set @k=@k+1 
end 
 
drop table #temp 
rollback tran 
end