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MD5算法的T-SQL实现(FOR SQL2000)(二)

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发表于 2009-1-22 16:54:20 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式

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  IF EXISTS(SELECT * FROM dbo.sysobjects WHERE id = OBJECT_ID(N'[dbo].[MD5_ConvertToWordArray]') AND xtype IN(N'FN', N'IF', N'TF'))     DROP FUNCTION [dbo].[MD5_ConvertToWordArray]   GO   /*****************************************************************************   * Name: MD5_ConvertToWordArray   * Description: MD5_ConvertToWordArray   *****************************************************************************/   CREATE FUNCTION dbo.MD5_ConvertToWordArray(      @sOrigMess    VARCHAR(8000)  = ''   )   RETURNS @tWordArray TABLE([ID] INT IDENTITY(0,1),[Word] INT)   WITH ENCRYPTION   AS   BEGIN     IF @sOrigMess IS NULL       SET @sOrigMess = ''        DECLARE @iLenOfMess      INT     DECLARE @iWordArrayLen    INT     DECLARE @iPosOfWord      INT     DECLARE @iPosOfMess      INT     DECLARE @iCountOfWord    INT        SET @iLenOfMess = LEN(@sOrigMess)     SET @iWordArrayLen = ((@iLenOfMess 8)/64 1) * 16     SET @iCountOfWord = 0     WHILE(@iCountOfWord<@iWordArrayLen)     BEGIN       INSERT INTO @tWordArray([Word]) VALUES(0)       SET @iCountOfWord = @iCountOfWord 1     END        SELECT @iPosOfMess = 0, @iPosOfWord = 0, @iCountOfWord = 0     WHILE(@iPosOfMess < @iLenOfMess)     BEGIN       SELECT @iCountOfWord = @iPosOfMess / 4, @iPosOfWord = @iPosOfMess % 4       UPDATE @tWordArray         SET [Word] = [Word] | dbo.MD5_LShift(UNICODE(SUBSTRING(@sOrigMess,@iPosOfMess 1,1)),@iPosOfWord*8)         WHERE [ID] = @iCountOfWord       SET @iPosOfMess = @iPosOfMess 1     END          SELECT @iCountOfWord = @iPosOfMess / 4, @iPosOfWord = @iPosOfMess % 4     UPDATE @tWordArray       SET [Word] = [Word] | dbo.MD5_LShift(0x80,@iPosOfWord*8)       WHERE [ID] = @iCountOfWord        UPDATE @tWordArray       SET [Word] = [Word] | dbo.MD5_LShift(@iLenOfMess,3)       WHERE [ID] = @iWordArrayLen - 2     UPDATE @tWordArray       SET [Word] = [Word] | dbo.MD5_RShift(@iLenOfMess,29)       WHERE [ID] = @iWordArrayLen - 1     RETURN   END   GO      IF EXISTS(SELECT * FROM dbo.sysobjects WHERE id = OBJECT_ID(N'[dbo].[MD5_WordToHex]') AND xtype IN(N'FN', N'IF', N'TF'))     DROP FUNCTION [dbo].[MD5_WordToHex]   GO   /*****************************************************************************   * Name: MD5_WordToHex   * Description: MD5_WordToHex   *****************************************************************************/   CREATE FUNCTION dbo.MD5_WordToHex(      @iValue    INT   )   RETURNS CHAR(8)   WITH ENCRYPTION   AS   BEGIN     DECLARE @sRes  VARCHAR(8)     DECLARE @iTmp  INT     DECLARE @iCount TINYINT        SELECT @sRes = '', @iCount = 0     WHILE(@iCount<4)     BEGIN       SET @iTmp = dbo.MD5_RShift(@iValue,@iCount*8) & 0x000000FF       SET @sRes = @sRes CASE @iTmp / 16 WHEN 0 THEN '0'                         WHEN 1 THEN '1'                         WHEN 2 THEN '2'                         WHEN 3 THEN '3'                         WHEN 4 THEN '4'                         WHEN 5 THEN '5'                         WHEN 6 THEN '6'                         WHEN 7 THEN '7'                         WHEN 8 THEN '8'                         WHEN 9 THEN '9'                         WHEN 10 THEN 'A'                         WHEN 11 THEN 'B'                         WHEN 12 THEN 'C'                         WHEN 13 THEN 'D'                         WHEN 14 THEN 'E'                         WHEN 15 THEN 'F'                         ELSE '' END                 CASE @iTmp % 16 WHEN 0 THEN '0'                         WHEN 1 THEN '1'                         WHEN 2 THEN '2'                         WHEN 3 THEN '3'                         WHEN 4 THEN '4'                         WHEN 5 THEN '5'                         WHEN 6 THEN '6'                         WHEN 7 THEN '7'                         WHEN 8 THEN '8'                         WHEN 9 THEN '9'                         WHEN 10 THEN 'A'                         WHEN 11 THEN 'B'                         WHEN 12 THEN 'C'                         WHEN 13 THEN 'D'                         WHEN 14 THEN 'E'                         WHEN 15 THEN 'F'                         ELSE '' END       SET @iCount = @iCount 1     END     RETURN(@sRes)   END   GO      IF EXISTS(SELECT * FROM dbo.sysobjects WHERE id = OBJECT_ID(N'[dbo].[MD5]') AND xtype IN(N'FN', N'IF', N'TF'))     DROP FUNCTION [dbo].[MD5]   GO   /*****************************************************************************   * Name: MD5   * Description: MD5   *****************************************************************************/   CREATE FUNCTION dbo.MD5(      @sOrigMess  NVARCHAR(4000)   )   RETURNS CHAR(32)   WITH ENCRYPTION   AS   BEGIN     --====================================     DECLARE @S11 TINYINT     DECLARE @S12 TINYINT     DECLARE @S13 TINYINT     DECLARE @S14 TINYINT     DECLARE @S21 TINYINT     DECLARE @S22 TINYINT     DECLARE @S23 TINYINT     DECLARE @S24 TINYINT     DECLARE @S31 TINYINT     DECLARE @S32 TINYINT     DECLARE @S33 TINYINT     DECLARE @S34 TINYINT     DECLARE @S41 TINYINT     DECLARE @S42 TINYINT     DECLARE @S43 TINYINT     DECLARE @S44 TINYINT        SELECT @S11 = 7, @S12 = 12, @S13 = 17, @S14 = 22     SELECT @S21 = 5, @S22 = 9, @S23 = 14, @S24 = 20     SELECT @S31 = 4, @S32 = 11, @S33 = 16, @S34 = 23     SELECT @S41 = 6, @S42 = 10, @S43 = 15, @S44 = 21     --====================================     DECLARE @a INT     DECLARE @b INT     DECLARE @c INT     DECLARE @d INT     DECLARE @AA  INT     DECLARE @BB  INT     DECLARE @CC  INT     DECLARE @DD  INT        SELECT  @a = 0x67452301         ,@b = 0xEFCDAB89         ,@c = 0x98BADCFE         ,@d = 0x10325476     --====================================     DECLARE @sRes  VARCHAR(32)     SET @sRes = ''     DECLARE @iWordArrayLen    INT     DECLARE @iWordArrayCount  INT        DECLARE @tTmp TABLE([ID] INT, [Word] INT)     INSERT INTO @tTmp SELECT * FROM dbo.MD5_ConvertToWordArray(@sOrigMess)     SELECT @iWordArrayCount=0, @iWordArrayLen = COUNT(*) <
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