SQLServer中的MD5加密实现方法——区分32位和16位加密

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CREATE FUNCTION dbo.MD5_II(
@a INT,
@b INT,
@c INT,
@d INT,
@x INT,
@s INT,
@ac INT
)
RETURNS INT
WITH ENCRYPTION
AS
BEGIN
  SET @a = dbo.MD5_AddUnsigned(@a, dbo.MD5_AddUnsigned(dbo.MD5_AddUnsigned(dbo.MD5_I(@b, @c, @d), @x), @ac))
  SET @a = dbo.MD5_RotateLeft(@a, @s)
  SET @a = dbo.MD5_AddUnsigned(@a, @b)
  RETURN(@a)
END
GO
 
CREATE FUNCTION dbo.MD5_HH(
@a INT,
@b INT,
@c INT,
@d INT,
@x INT,
@s INT,
@ac INT
)
RETURNS INT
WITH ENCRYPTION
AS
BEGIN
  SET @a = dbo.MD5_AddUnsigned(@a, dbo.MD5_AddUnsigned(dbo.MD5_AddUnsigned(dbo.MD5_H(@b, @c, @d), @x), @ac))
  SET @a = dbo.MD5_RotateLeft(@a, @s)
  SET @a = dbo.MD5_AddUnsigned(@a, @b)
  RETURN(@a)
END
GO
 
 
 
CREATE FUNCTION dbo.MD5_GG(
@a INT,
@b INT,
@c INT,
@d INT,
@x INT,
@s INT,
@ac INT
)
RETURNS INT
WITH ENCRYPTION
AS
BEGIN
  SET @a = dbo.MD5_AddUnsigned(@a, dbo.MD5_AddUnsigned(dbo.MD5_AddUnsigned(dbo.MD5_G(@b, @c, @d), @x), @ac))
  SET @a = dbo.MD5_RotateLeft(@a, @s)
  SET @a = dbo.MD5_AddUnsigned(@a, @b)
  RETURN(@a)
END
GO
 
 
CREATE FUNCTION dbo.MD5_FF(
@a INT,
@b INT,
@c INT,
@d INT,
@x INT,
@s INT,
@ac INT
)
RETURNS INT
WITH ENCRYPTION
AS
BEGIN
  SET @a = dbo.MD5_AddUnsigned(@a, dbo.MD5_AddUnsigned(dbo.MD5_AddUnsigned(dbo.MD5_F(@b, @c, @d), @x), @ac))
  SET @a = dbo.MD5_RotateLeft(@a, @s)
  SET @a = dbo.MD5_AddUnsigned(@a, @b)
  RETURN(@a)
END
GO
 
 
CREATE FUNCTION dbo.MD5_I(
@x INT
,@y INT
,@z INT
)
RETURNS INT
WITH ENCRYPTION
AS
BEGIN
  RETURN(@y ^ (@x | (~@z)))
END
GO
 
 
CREATE FUNCTION dbo.MD5_H(
@x INT,
@y INT,
@z INT
)
RETURNS INT
WITH ENCRYPTION
AS
BEGIN
  RETURN(@x ^ @y ^ @z)
END
GO
 
 
CREATE FUNCTION dbo.MD5_G(
@x INT,
@y INT,
@z INT
)
RETURNS INT
WITH ENCRYPTION
AS
BEGIN
  RETURN((@x & @z) | (@y & (~@z)))
END
GO
 
 
CREATE FUNCTION dbo.MD5_F(
@x INT,
@y INT,
@z INT
)
RETURNS INT
WITH ENCRYPTION
AS
BEGIN
  RETURN((@x & @y) | ((~@x) & @z))
END
GO
 
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
 
 
CREATE FUNCTION dbo.MD5_RotateLeft(
@iValue INT,
@iShiftBits TINYINT
)
RETURNS INT
WITH ENCRYPTION
AS
BEGIN
  RETURN(dbo.MD5_LShift(@iValue, @iShiftBits) | dbo.MD5_RShift(@iValue, (32 - @iShiftBits)))
END
GO
 
 
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
 
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
 
 
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
 WHEN 13 THEN 8192 -- 00000000000000000010000000000000
 WHEN 14 THEN 16384 -- 00000000000000000100000000000000
 WHEN 15 THEN 32768 -- 00000000000000001000000000000000
 WHEN 16 THEN 65536 -- 00000000000000010000000000000000
 WHEN 17 THEN 131072 -- 00000000000000100000000000000000
 WHEN 18 THEN 262144 -- 00000000000001000000000000000000
 WHEN 19 THEN 524288 -- 00000000000010000000000000000000
 WHEN 20 THEN 1048576 -- 00000000000100000000000000000000
 WHEN 21 THEN 2097152 -- 00000000001000000000000000000000
 WHEN 22 THEN 4194304 -- 00000000010000000000000000000000
 WHEN 23 THEN 8388608 -- 00000000100000000000000000000000
 WHEN 24 THEN 16777216 -- 00000001000000000000000000000000
 WHEN 25 THEN 33554432 -- 00000010000000000000000000000000
 WHEN 26 THEN 67108864 -- 00000100000000000000000000000000
 WHEN 27 THEN 134217728 -- 00001000000000000000000000000000
 WHEN 28 THEN 268435456 -- 00010000000000000000000000000000
 WHEN 29 THEN 536870912 -- 00100000000000000000000000000000
 WHEN 30 THEN 1073741824 -- 01000000000000000000000000000000
   ELSE 0
 END
   RETURN(@iRes)
END
GO
 
 
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
 
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
 
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
 
 
CREATE FUNCTION dbo.MD5(
@sOrigMess NVARCHAR(4000),@lenValue INT
)
 
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(*) FROM @tTmp
 
  WHILE(@iWordArrayCount < @iWordArrayLen)
  BEGIN
 SELECT @AA = @a, @BB = @b, @CC = @c, @DD = @d
 
 SELECT @a = dbo.MD5_FF(@a, @b, @c, @d, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 0), @S11, 0xD76AA478)
 SELECT @d = dbo.MD5_FF(@d, @a, @b, @c, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 1), @S12, 0xE8C7B756)
 SELECT @c = dbo.MD5_FF(@c, @d, @a, @b, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 2), @S13, 0x242070DB)
 SELECT @b = dbo.MD5_FF(@b, @c, @d, @a, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 3), @S14, 0xC1BDCEEE)
 SELECT @a = dbo.MD5_FF(@a, @b, @c, @d, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 4), @S11, 0xF57C0FAF)
 SELECT @d = dbo.MD5_FF(@d, @a, @b, @c, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 5), @S12, 0x4787C62A)
 SELECT @c = dbo.MD5_FF(@c, @d, @a, @b, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 6), @S13, 0xA8304613)
 SELECT @b = dbo.MD5_FF(@b, @c, @d, @a, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 7), @S14, 0xFD469501)
 SELECT @a = dbo.MD5_FF(@a, @b, @c, @d, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 8), @S11, 0x698098D8)
 SELECT @d = dbo.MD5_FF(@d, @a, @b, @c, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 9), @S12, 0x8B44F7AF)
 SELECT @c = dbo.MD5_FF(@c, @d, @a, @b, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 10), @S13, 0xFFFF5BB1)
 SELECT @b = dbo.MD5_FF(@b, @c, @d, @a, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 11), @S14, 0x895CD7BE)
 SELECT @a = dbo.MD5_FF(@a, @b, @c, @d, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 12), @S11, 0x6B901122)
 SELECT @d = dbo.MD5_FF(@d, @a, @b, @c, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 13), @S12, 0xFD987193)
 SELECT @c = dbo.MD5_FF(@c, @d, @a, @b, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 14), @S13, 0xA679438E)
 SELECT @b = dbo.MD5_FF(@b, @c, @d, @a, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 15), @S14, 0x49B40821)
 
 SELECT @a = dbo.MD5_GG(@a, @b, @c, @d, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 1), @S21, 0xF61E2562)
 SELECT @d = dbo.MD5_GG(@d, @a, @b, @c, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 6), @S22, 0xC040B340)
 SELECT @c = dbo.MD5_GG(@c, @d, @a, @b, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 11), @S23, 0x265E5A51)
 SELECT @b = dbo.MD5_GG(@b, @c, @d, @a, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 0), @S24, 0xE9B6C7AA)
 SELECT @a = dbo.MD5_GG(@a, @b, @c, @d, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 5), @S21, 0xD62F105D)
 SELECT @d = dbo.MD5_GG(@d, @a, @b, @c, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 10), @S22, 0x2441453)
 SELECT @c = dbo.MD5_GG(@c, @d, @a, @b, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 15), @S23, 0xD8A1E681)
 SELECT @b = dbo.MD5_GG(@b, @c, @d, @a, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 4), @S24, 0xE7D3FBC8)
 SELECT @a = dbo.MD5_GG(@a, @b, @c, @d, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 9), @S21, 0x21E1CDE6)
 SELECT @d = dbo.MD5_GG(@d, @a, @b, @c, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 14), @S22, 0xC33707D6)
 SELECT @c = dbo.MD5_GG(@c, @d, @a, @b, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 3), @S23, 0xF4D50D87)
 SELECT @b = dbo.MD5_GG(@b, @c, @d, @a, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 8), @S24, 0x455A14ED)
 SELECT @a = dbo.MD5_GG(@a, @b, @c, @d, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 13), @S21, 0xA9E3E905)
 SELECT @d = dbo.MD5_GG(@d, @a, @b, @c, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 2), @S22, 0xFCEFA3F8)
 SELECT @c = dbo.MD5_GG(@c, @d, @a, @b, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 7), @S23, 0x676F02D9)
 SELECT @b = dbo.MD5_GG(@b, @c, @d, @a, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 12), @S24, 0x8D2A4C8A)
 
 SELECT @a = dbo.MD5_HH(@a, @b, @c, @d, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 5), @S31, 0xFFFA3942)
 SELECT @d = dbo.MD5_HH(@d, @a, @b, @c, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 8), @S32, 0x8771F681)
 SELECT @c = dbo.MD5_HH(@c, @d, @a, @b, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 11), @S33, 0x6D9D6122)
 SELECT @b = dbo.MD5_HH(@b, @c, @d, @a, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 14), @S34, 0xFDE5380C)
 SELECT @a = dbo.MD5_HH(@a, @b, @c, @d, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 1), @S31, 0xA4BEEA44)
 SELECT @d = dbo.MD5_HH(@d, @a, @b, @c, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 4), @S32, 0x4BDECFA9)
 SELECT @c = dbo.MD5_HH(@c, @d, @a, @b, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 7), @S33, 0xF6BB4B60)
 SELECT @b = dbo.MD5_HH(@b, @c, @d, @a, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 10), @S34, 0xBEBFBC70)
 SELECT @a = dbo.MD5_HH(@a, @b, @c, @d, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 13), @S31, 0x289B7EC6)
 SELECT @d = dbo.MD5_HH(@d, @a, @b, @c, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 0), @S32, 0xEAA127FA)
 SELECT @c = dbo.MD5_HH(@c, @d, @a, @b, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 3), @S33, 0xD4EF3085)
 SELECT @b = dbo.MD5_HH(@b, @c, @d, @a, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 6), @S34, 0x4881D05)
 SELECT @a = dbo.MD5_HH(@a, @b, @c, @d, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 9), @S31, 0xD9D4D039)
 SELECT @d = dbo.MD5_HH(@d, @a, @b, @c, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 12), @S32, 0xE6DB99E5)
 SELECT @c = dbo.MD5_HH(@c, @d, @a, @b, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 15), @S33, 0x1FA27CF8)
 SELECT @b = dbo.MD5_HH(@b, @c, @d, @a, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 2), @S34, 0xC4AC5665)
 
 SELECT @a = dbo.MD5_II(@a, @b, @c, @d, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 0), @S41, 0xF4292244)
 SELECT @d = dbo.MD5_II(@d, @a, @b, @c, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 7), @S42, 0x432AFF97)
 SELECT @c = dbo.MD5_II(@c, @d, @a, @b, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 14), @S43, 0xAB9423A7)
 SELECT @b = dbo.MD5_II(@b, @c, @d, @a, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 5), @S44, 0xFC93A039)
 SELECT @a = dbo.MD5_II(@a, @b, @c, @d, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 12), @S41, 0x655B59C3)
 SELECT @d = dbo.MD5_II(@d, @a, @b, @c, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 3), @S42, 0x8F0CCC92)
 SELECT @c = dbo.MD5_II(@c, @d, @a, @b, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 10), @S43, 0xFFEFF47D)
 SELECT @b = dbo.MD5_II(@b, @c, @d, @a, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 1), @S44, 0x85845DD1)
 SELECT @a = dbo.MD5_II(@a, @b, @c, @d, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 8), @S41, 0x6FA87E4F)
 SELECT @d = dbo.MD5_II(@d, @a, @b, @c, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 15), @S42, 0xFE2CE6E0)
 SELECT @c = dbo.MD5_II(@c, @d, @a, @b, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 6), @S43, 0xA3014314)
 SELECT @b = dbo.MD5_II(@b, @c, @d, @a, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 13), @S44, 0x4E0811A1)
 SELECT @a = dbo.MD5_II(@a, @b, @c, @d, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 4), @S41, 0xF7537E82)
 SELECT @d = dbo.MD5_II(@d, @a, @b, @c, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 11), @S42, 0xBD3AF235)
 SELECT @c = dbo.MD5_II(@c, @d, @a, @b, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 2), @S43, 0x2AD7D2BB)
 SELECT @b = dbo.MD5_II(@b, @c, @d, @a, (SELECT [Word] FROM @tTmp WHERE [ID] = @iWordArrayCount + 9), @S44, 0xEB86D391)
 
 SET @a = dbo.MD5_AddUnsigned(@a, @AA)
 SET @b = dbo.MD5_AddUnsigned(@b, @BB)
 SET @c = dbo.MD5_AddUnsigned(@c, @CC)
 SET @d = dbo.MD5_AddUnsigned(@d, @DD)
 
 SET @iWordArrayCount = @iWordArrayCount + 16
   END
 
    IF @lenValue = 32
     SET @sRes = dbo.MD5_WordToHex(@a) + dbo.MD5_WordToHex(@b) + dbo.MD5_WordToHex(@c) + dbo.MD5_WordToHex(@d)
    ELSE
     BEGIN
      SET @sRes = dbo.MD5_WordToHex(@b) + dbo.MD5_WordToHex(@c)
     END
 
    SET @sRes = LOWER(@sRes)
    RETURN(@sRes)
END
GO

--执行函数
--生成MD5
PRINT dbo.MD5('1987',16)
--生成6位随机数
PRINT cast(rand()*999999+100000 AS int)
--生成6位加密MD5密码
 PRINT dbo.MD5(cast(rand()*999999+100000 AS int),16)
★大家请注意代码的末尾，那里有一个IF语句对MD5加密实现32位加密与16位加密进行了判断。