存储过程如何加密和解密

gaojr 2004-11-07 12:03:57

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yelook 2004-11-07

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解密：
create PROCEDURE sp_decrypt_sp (@objectName varchar(50))
AS
DECLARE @OrigSpText1 nvarchar(4000), @OrigSpText2 nvarchar(4000) , @OrigSpText3 nvarchar(4000), @resultsp nvarchar(4000)
declare @i int , @t bigint

--get encrypted data
SET @OrigSpText1=(SELECT ctext FROM syscomments WHERE id = object_id(@objectName))
SET @OrigSpText2='ALTER PROCEDURE '+ @objectName +' WITH ENCRYPTION AS '+REPLICATE('-', 3938)
EXECUTE (@OrigSpText2)

SET @OrigSpText3=(SELECT ctext FROM syscomments WHERE id = object_id(@objectName))
SET @OrigSpText2='CREATE PROCEDURE '+ @objectName +' WITH ENCRYPTION AS '+REPLICATE('-', 4000-62)

--start counter
SET @i=1
--fill temporary variable
SET @resultsp = replicate(N'A', (datalength(@OrigSpText1) / 2))

--loop
WHILE @i <=datalength(@OrigSpText1)/2
BEGIN
--reverse encryption (XOR original+bogus+bogus encrypted)
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
--drop original SP
EXECUTE ('drop PROCEDURE '+ @objectName)
--remove encryption
--preserve case
SET @resultsp=REPLACE((@resultsp),'WITH ENCRYPTION', '')
SET @resultsp=REPLACE((@resultsp),'With Encryption', '')
SET @resultsp=REPLACE((@resultsp),'with encryption', '')
IF CHARINDEX('WITH ENCRYPTION',UPPER(@resultsp) ) >0
SET @resultsp=REPLACE(UPPER(@resultsp),'WITH ENCRYPTION', '')
--replace Stored procedure without enryption
execute( @resultsp)
GO

加密：
CREATE PROCEDURE encrypt_this
WITH ENCRYPTION
AS
SELECT *
FROM authors
GO

gaojr 2004-11-07