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MD5算法的T-SQL实现（FOR SQL2000）（一）

时间:2007-11-09 来源:不详作者:迈克DB

　　　　　　WHEN 30 THEN 1073741824　 -- 01000000000000000000000000000000
　　　　　　ELSE 0
　　　　END
　　RETURN(@iRes)
END
GO

IF EXISTS(SELECT * FROM dbo.sysobjects WHERE id = OBJECT_ID(N'[dbo].[MD5_LShift]') AND xtype IN(N'FN', N'IF', N'TF'))
　　DROP FUNCTION [dbo].[MD5_LShift]
GO
/*****************************************************************************
* Name: MD5_LShift
* Description: MD5_LShift
*****************************************************************************/
CREATE FUNCTION dbo.MD5_LShift(
　　 @iValue　　　　INT
　　,@iShiftBits　　TINYINT
)
RETURNS INT
WITH ENCRYPTION
AS
BEGIN
　　DECLARE @iRes　　BIGINT
　　SET @iRes = CAST(@iValue AS BINARY(8))
　　SET @iRes = @iRes * dbo.MD5_m_2Power(@iShiftBits)
　　RETURN(CAST(@iRes & 0x00000000FFFFFFFF AS BINARY(4)))
END
GO

IF EXISTS(SELECT * FROM dbo.sysobjects WHERE id = OBJECT_ID(N'[dbo].[MD5_RShift]') AND xtype IN(N'FN', N'IF', N'TF'))
　　DROP FUNCTION [dbo].[MD5_RShift]

dedecms.com

GO
/*****************************************************************************
* Name: MD5_RShift
* Description: MD5_RShift
*****************************************************************************/
CREATE FUNCTION dbo.MD5_RShift(
　　 @iValue　　　　INT
　　,@iShiftBits　　TINYINT
)
RETURNS INT
WITH ENCRYPTION
AS
BEGIN
　　DECLARE @iRes　　BIGINT
　　SET @iRes = CAST(@iValue AS BINARY(8))
　　SET @iRes = @iRes / dbo.MD5_m_2Power(@iShiftBits)
　　RETURN(CAST(@iRes & 0x00000000FFFFFFFF AS BINARY(4)))
END
GO

IF EXISTS(SELECT * FROM dbo.sysobjects WHERE id = OBJECT_ID(N'[dbo].[MD5_RotateLeft]') AND xtype IN(N'FN', N'IF', N'TF'))
　　DROP FUNCTION [dbo].[MD5_RotateLeft]
GO
/*****************************************************************************
* Name: MD5_RotateLeft
* Description: MD5_RotateLeft
*****************************************************************************/
CREATE FUNCTION dbo.MD5_RotateLeft(
　　 @iValue　　　　INT dedecms.com
　　,@iShiftBits　　TINYINT
)
RETURNS INT
WITH ENCRYPTION
AS
BEGIN
　　RETURN(dbo.MD5_LShift(@iValue, @iShiftBits) | dbo.MD5_RShift(@iValue, (32 - @iShiftBits)))
END
GO

IF EXISTS(SELECT * FROM dbo.sysobjects WHERE id = OBJECT_ID(N'[dbo].[MD5_AddUnsigned]') AND xtype IN(N'FN', N'IF', N'TF'))
　　DROP FUNCTION [dbo].[MD5_AddUnsigned]
GO
/*****************************************************************************
* Name: MD5_AddUnsigned
* Description: MD5_AddUnsigned
*****************************************************************************/
CREATE FUNCTION dbo.MD5_AddUnsigned(
　　 @iX　　　　INT
　　,@iY　　　　INT
)
RETURNS INT
WITH ENCRYPTION
AS
BEGIN
　　DECLARE @iRes　　BIGINT
　　SET @iRes = CAST(CAST(@iX AS BINARY(8)) AS BIGINT) CAST(CAST(@iY AS BINARY(8)) AS BIGINT)
　　RETURN(CAST(@iRes & 0x00000000FFFFFFFF AS BINARY(4)))
END
GO

IF EXISTS(SELECT * FROM dbo.sysobjects WHERE id = OBJECT_ID(N'[dbo].[MD5_F]') AND xtype IN(N'FN', N'IF', N'TF'))