MD5算法的T-SQL实现(FORSQL2000)(一)

2008-04-02 10:48:06来源:互联网 阅读 ()

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/*****************************************************************************
* Name: T-SQL MD5算法实现
* Author: Rambo Qian
* Create Date: 2003-04-10
* Last Modified by: Rambo Qian
* Last Update Date: 2003-04-16
* Version: V1.0.00
*****************************************************************************/
GO

IF EXISTS(SELECT * FROM dbo.sysobjects WHERE id = OBJECT_ID(N'[dbo].[MD5_m_OnBits]') AND xtype IN(N'FN', N'IF', N'TF'))
  DROP FUNCTION [dbo].[MD5_m_OnBits]
GO
/*****************************************************************************
* Name: MD5_m_OnBits
* Description: 常数组
*****************************************************************************/
CREATE FUNCTION dbo.MD5_m_OnBits(
  @i  TINYINT
)
RETURNS INT
WITH ENCRYPTION
AS
BEGIN
  DECLARE @iRes  INT
  SELECT @iRes =
    CASE @i
      WHEN 0 THEN 1      -- 00000000000000000000000000000001
      WHEN 1 THEN 3      -- 00000000000000000000000000000011
      WHEN 2 THEN 7      -- 00000000000000000000000000000111
      WHEN 3 THEN 15      -- 00000000000000000000000000001111
      WHEN 4 THEN 31      -- 00000000000000000000000000011111
      WHEN 5 THEN 63      -- 00000000000000000000000000111111
      WHEN 6 THEN 127     -- 00000000000000000000000001111111
      WHEN 7 THEN 255     -- 00000000000000000000000011111111
      WHEN 8 THEN 511     -- 00000000000000000000000111111111
      WHEN 9 THEN 1023     -- 00000000000000000000001111111111
      WHEN 10 THEN 2047     -- 00000000000000000000011111111111
      WHEN 11 THEN 4095     -- 00000000000000000000111111111111
      WHEN 12 THEN 8191     -- 00000000000000000001111111111111
      WHEN 13 THEN 16383    -- 00000000000000000011111111111111
      WHEN 14 THEN 32767    -- 00000000000000000111111111111111
      WHEN 15 THEN 65535    -- 00000000000000001111111111111111
      WHEN 16 THEN 131071    -- 00000000000000011111111111111111
      WHEN 17 THEN 262143    -- 00000000000000111111111111111111
      WHEN 18 THEN 524287    -- 00000000000001111111111111111111
      WHEN 19 THEN 1048575   -- 00000000000011111111111111111111
      WHEN 20 THEN 2097151   -- 00000000000111111111111111111111
      WHEN 21 THEN 4194303   -- 00000000001111111111111111111111
      WHEN 22 THEN 8388607   -- 00000000011111111111111111111111
      WHEN 23 THEN 16777215   -- 00000000111111111111111111111111
      WHEN 24 THEN 33554431   -- 00000001111111111111111111111111
      WHEN 25 THEN 67108863   -- 00000011111111111111111111111111
      WHEN 26 THEN 134217727  -- 00000111111111111111111111111111
      WHEN 27 THEN 268435455  -- 00001111111111111111111111111111
      WHEN 28 THEN 536870911  -- 00011111111111111111111111111111
      WHEN 29 THEN 1073741823  -- 00111111111111111111111111111111
      WHEN 30 THEN 2147483647  -- 01111111111111111111111111111111
      ELSE 0
    END
  RETURN(@iRes)
END
GO

IF EXISTS(SELECT * FROM dbo.sysobjects WHERE id = OBJECT_ID(N'[dbo].[MD5_m_2Power]') AND xtype IN(N'FN', N'IF', N'TF'))
  DROP FUNCTION [dbo].[MD5_m_2Power]
GO
/*****************************************************************************
* Name: MD5_m_2Power
* Description: 常数组
*****************************************************************************/
CREATE FUNCTION dbo.MD5_m_2Power(
  @i  TINYINT
)
RETURNS INT
WITH ENCRYPTION
AS
BEGIN
  DECLARE @iRes  INT
  SELECT @iRes =
    CASE @i
      WHEN 0 THEN 1      -- 00000000000000000000000000000001
      WHEN 1 THEN 2      -- 00000000000000000000000000000010
      WHEN 2 THEN 4      -- 00000000000000000000000000000100
      WHEN 3 THEN 8      -- 00000000000000000000000000001000
      WHEN 4 THEN 16      -- 00000000000000000000000000010000
      WHEN 5 THEN 32      -- 00000000000000000000000000100000
      WHEN 6 THEN 64      -- 00000000000000000000000001000000
      WHEN 7 THEN 128     -- 00000000000000000000000010000000
      WHEN 8 THEN 256     -- 00000000000000000000000100000000
      WHEN 9 THEN 512     -- 00000000000000000000001000000000
      WHEN 10 THEN 1024     -- 00000000000000000000010000000000
      WHEN 11 THEN 2048     -- 00000000000000000000100000000000
      WHEN 12 THEN 4096     -- 00000000000000000001000000000000

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