UTF8编码的Base64解密 MSSQL实现

加密解密UTF8编码的BASE64串 无 GOCREATE FUNCTION [dbo].[c_GetUTF8Code] ( @char Nchar )RETURNS intAS--UTF8转码BEGIN Declare @Code int Select @Code=Cast(Unicode(@char) as int) Declare @Utf8Code int Set @Utf8Code=0 if(@Code128) begin --0-127 --

加密解密UTF8编码的BASE64串

GO

CREATE FUNCTION [dbo].[c_GetUTF8Code]  
   (  
       @char Nchar
   )
RETURNS int
AS

--UTF8转码
BEGIN
 Declare @Code int
 Select @Code=Cast(Unicode(@char) as int)
 Declare @Utf8Code int
 Set @Utf8Code=0
 if(@Code127 and @Code2047 and @Code127 and @CodeInt2047)
  begin
   --+3位
   if(@RestTransferLenth=0)
   begin
    Set @CodeTransfer=@CodeInt
    Set @RestTransfer=0
    Set @RestTransferLenth=0
   end
   else if(@RestTransferLenth=1)
   begin
    Set @CodeTransfer=0x10000*@RestTransfer+@CodeInt/0x100
    Set @RestTransfer=@CodeInt%0x100
    Set @RestTransferLenth=1
   end
   else if(@RestTransferLenth=2)
   begin
    --剩余部分十六进制右移两位与新数据前两位之和
    Set @CodeTransfer=0x100*@RestTransfer+@CodeInt/0x10000
    Set @RestTransfer=@CodeInt%0x10000
    Set @RestTransferLenth=2
   end
  end
  ---累积到3位，执行加密转换
  if(@CodeTransfer>0x100000)
  begin
   SET @block_val = CAST(@CodeTransfer AS BINARY(3))  
   SET @output = @output 
   + SUBSTRING(@map , @block_val/262144  +1,1)
   + SUBSTRING(@map ,(@block_val/4096&63)+1,1)
   + SUBSTRING(@map ,(@block_val/64  &63)+1,1)
   + SUBSTRING(@map ,(@block_val&63)     +1,1)
  end
  SET @block_start=@block_start+1  
 END  
 IF @RestTransferLenth>0  
  BEGIN  
  
  SET @block_val=Cast(@RestTransfer*(Case @RestTransferLenth When 1 Then 65536 Else 256 end) as BINARY(3))
  SET @output=@output  
   +SUBSTRING(@map , @block_val/262144+1,    1)  
   +SUBSTRING(@map ,(@block_val/4096  &63)+1,1)  
   +CASE WHEN @RestTransferLenth =1
   THEN REPLACE(SUBSTRING(@map ,(@block_val/64&63)+1,1),'A','=')  
   ELSE SUBSTRING(@map ,(@block_val/64&63)+1,1)
    END
   +CASE WHEN @RestTransferLenth=1  
   THEN '='  
   ELSE REPLACE(SUBSTRING(@map ,(@block_val&63)+1,1),'A','=')
    END  
  END
 RETURN @output  
END

 

 

 






GO

CREATE FUNCTION [dbo].[base64_utf8decode]  
   (  
       @encoded_text varchar(max)  
   )  
   RETURNS varchar(max)  
   AS BEGIN 

--BASE64加密
DECLARE @output varchar(max)
DECLARE @block_start int
DECLARE @encoded_length int
DECLARE @decoded_length int 
DECLARE @mapr binary(122)  
SET @output = ''  
SET @mapr =  
  0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF    --    1-33  
  +0xFFFFFFFFFFFFFFFFFFFF3EFFFFFF3F3435363738393A3B3C3DFFFFFF00FFFFFF    --    33-64  
  +0x000102030405060708090A0B0C0D0E0F10111213141516171819FFFFFFFFFFFF    --    65-96  
  +0x1A1B1C1D1E1F202122232425262728292A2B2C2D2E2F30313233--    97-122  
SET @encoded_length=LEN(@encoded_text)  
SET @decoded_length=@encoded_length/4*3
SET @block_start=1  
Declare @Code int
Set @Code=0
Declare @CodeLength int--累计连接数，1，2，3
Set @CodeLength =0
WHILE @block_start