VB实现的16位和32位md5加密代码分享_VB

在各种登陆系统中，用户密码的md5加密是不可少的。
这么说吧，即使你通过各种手段看到了用户的登陆密码，但那一串古古怪怪的东西你也不可能知道它是什么，这就是保护。
md5加密运算是不可逆的，就是说你不能通过那一串古古怪怪的东西算出它原始的样子。
下面是完整的md5代码，不要去理解算法了，用到时拿去直接调用。
				?

									Private Const BITS_TO_A_BYTE = 8

									Private Const BYTES_TO_A_WORD = 4

									Private Const BITS_TO_A_WORD = 32

									Private m_lOnBits(30)

									Private m_l2Power(30)

									Private Function LShift(lValue, iShiftBits)

									If iShiftBits = 0 Then

									LShift = lValue

									Exit Function

									ElseIf iShiftBits = 31 Then

									If lValue And 1 Then

									LShift = &H80000000

									Else

									LShift = 0

									End If

									Exit Function

									ElseIf iShiftBits < 0 Or iShiftBits > 31 Then

									Err.Raise 6

									End If

									If (lValue And m_l2Power(31 - iShiftBits)) Then

									LShift = ((lValue And m_lOnBits(31 - (iShiftBits + 1))) * m_l2Power(iShiftBits)) Or &H80000000

									Else

									LShift = ((lValue And m_lOnBits(31 - iShiftBits)) * m_l2Power(iShiftBits))

									End If

									End Function

									Private Function RShift(lValue, iShiftBits)

									If iShiftBits = 0 Then

									RShift = lValue

									Exit Function

									ElseIf iShiftBits = 31 Then

									If lValue And &H80000000 Then

									RShift = 1

									Else

									RShift = 0

									End If

									Exit Function

									ElseIf iShiftBits < 0 Or iShiftBits > 31 Then

									Err.Raise 6

									End If

									RShift = (lValue And &H7FFFFFFE) \ m_l2Power(iShiftBits)

									If (lValue And &H80000000) Then

									RShift = (RShift Or (&H40000000 \ m_l2Power(iShiftBits - 1)))

									End If

									End Function

									Private Function RotateLeft(lValue, iShiftBits)

									RotateLeft = LShift(lValue, iShiftBits) Or RShift(lValue, (32 - iShiftBits))

									End Function

									Private Function AddUnsigned(lX, lY)

									Dim lX4

									Dim lY4

									Dim lX8

									Dim lY8

									Dim lResult

									lX8 = lX And &H80000000

									lY8 = lY And &H80000000

									lX4 = lX And &H40000000

									lY4 = lY And &H40000000

									lResult = (lX And &H3FFFFFFF) + (lY And &H3FFFFFFF)

									If lX4 And lY4 Then

									lResult = lResult Xor &H80000000 Xor lX8 Xor lY8

									ElseIf lX4 Or lY4 Then

									If lResult And &H40000000 Then

									lResult = lResult Xor &HC0000000 Xor lX8 Xor lY8

									Else

									lResult = lResult Xor &H40000000 Xor lX8 Xor lY8

									End If

									Else

									lResult = lResult Xor lX8 Xor lY8

									End If

									AddUnsigned = lResult

									End Function

									Private Function md5_F(x, y, z)

									md5_F = (x And y) Or ((Not x) And z)

									End Function

									Private Function md5_G(x, y, z)

									md5_G = (x And z) Or (y And (Not z))

									End Function

									Private Function md5_H(x, y, z)

									md5_H = (x Xor y Xor z)

									End Function

									Private Function md5_I(x, y, z)

									md5_I = (y Xor (x Or (Not z)))

									End Function

									Private Sub md5_FF(a, b, c, d, x, s, ac)

									a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_F(b, c, d), x), ac))

									a = RotateLeft(a, s)

									a = AddUnsigned(a, b)

									End Sub

									Private Sub md5_GG(a, b, c, d, x, s, ac)

									a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_G(b, c, d), x), ac))

									a = RotateLeft(a, s)

									a = AddUnsigned(a, b)

									End Sub

									Private Sub md5_HH(a, b, c, d, x, s, ac)

									a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_H(b, c, d), x), ac))

									a = RotateLeft(a, s)

									a = AddUnsigned(a, b)

									End Sub

									Private Sub md5_II(a, b, c, d, x, s, ac)

									a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_I(b, c, d), x), ac))

									a = RotateLeft(a, s)

									a = AddUnsigned(a, b)

									End Sub

									Private Function ConvertToWordArray(sMessage)

									Dim lMessageLength

									Dim lNumberOfWords

									Dim lWordArray()

									Dim lBytePosition

									Dim lByteCount

									Dim lWordCount

									Const MODULUS_BITS = 512

									Const CONGRUENT_BITS = 448

									lMessageLength = Len(sMessage)

									lNumberOfWords = (((lMessageLength + ((MODULUS_BITS - CONGRUENT_BITS) \ BITS_TO_A_BYTE)) \ (MODULUS_BITS \ BITS_TO_A_BYTE)) + 1) * (MODULUS_BITS \ BITS_TO_A_WORD)

									ReDim lWordArray(lNumberOfWords - 1)

									lBytePosition = 0

									lByteCount = 0

									Do Until lByteCount >= lMessageLength

									lWordCount = lByteCount \ BYTES_TO_A_WORD

									lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE

									lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(Asc(Mid(sMessage, lByteCount + 1, 1)), lBytePosition)

									lByteCount = lByteCount + 1

									Loop

									lWordCount = lByteCount \ BYTES_TO_A_WORD

									lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE

									lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(&H80, lBytePosition)

									lWordArray(lNumberOfWords - 2) = LShift(lMessageLength, 3)

									lWordArray(lNumberOfWords - 1) = RShift(lMessageLength, 29)

									ConvertToWordArray = lWordArray

									End Function

									Private Function WordToHex(lValue)

									Dim lByte

									Dim lCount

									For lCount = 0 To 3

									lByte = RShift(lValue, lCount * BITS_TO_A_BYTE) And m_lOnBits(BITS_TO_A_BYTE - 1)

									WordToHex = WordToHex & Right("0" & Hex(lByte), 2)

									Next

									End Function

									Public Function MD5(sMessage, stype)

									m_lOnBits(0) = CLng(1)

									m_lOnBits(1) = CLng(3)

									m_lOnBits(2) = CLng(7)

									m_lOnBits(3) = CLng(15)

									m_lOnBits(4) = CLng(31)

									m_lOnBits(5) = CLng(63)

									m_lOnBits(6) = CLng(127)

									m_lOnBits(7) = CLng(255)

									m_lOnBits(8) = CLng(511)

									m_lOnBits(9) = CLng(1023)

									m_lOnBits(10) = CLng(2047)

									m_lOnBits(11) = CLng(4095)

									m_lOnBits(12) = CLng(8191)

									m_lOnBits(13) = CLng(16383)

									m_lOnBits(14) = CLng(32767)

									m_lOnBits(15) = CLng(65535)

									m_lOnBits(16) = CLng(131071)

									m_lOnBits(17) = CLng(262143)

									m_lOnBits(18) = CLng(524287)

									m_lOnBits(19) = CLng(1048575)

									m_lOnBits(20) = CLng(2097151)

									m_lOnBits(21) = CLng(4194303)

									m_lOnBits(22) = CLng(8388607)

									m_lOnBits(23) = CLng(16777215)

									m_lOnBits(24) = CLng(33554431)

									m_lOnBits(25) = CLng(67108863)

									m_lOnBits(26) = CLng(134217727)

									m_lOnBits(27) = CLng(268435455)

									m_lOnBits(28) = CLng(536870911)

									m_lOnBits(29) = CLng(1073741823)

									m_lOnBits(30) = CLng(2147483647)

									m_l2Power(0) = CLng(1)

									m_l2Power(1) = CLng(2)

									m_l2Power(2) = CLng(4)

									m_l2Power(3) = CLng(8)

									m_l2Power(4) = CLng(16)

									m_l2Power(5) = CLng(32)

									m_l2Power(6) = CLng(64)

									m_l2Power(7) = CLng(128)

									m_l2Power(8) = CLng(256)

									m_l2Power(9) = CLng(512)

									m_l2Power(10) = CLng(1024)

									m_l2Power(11) = CLng(2048)

									m_l2Power(12) = CLng(4096)

									m_l2Power(13) = CLng(8192)

									m_l2Power(14) = CLng(16384)

									m_l2Power(15) = CLng(32768)

									m_l2Power(16) = CLng(65536)

									m_l2Power(17) = CLng(131072)

									m_l2Power(18) = CLng(262144)

									m_l2Power(19) = CLng(524288)

									m_l2Power(20) = CLng(1048576)

									m_l2Power(21) = CLng(2097152)

									m_l2Power(22) = CLng(4194304)

									m_l2Power(23) = CLng(8388608)

									m_l2Power(24) = CLng(16777216)

									m_l2Power(25) = CLng(33554432)

									m_l2Power(26) = CLng(67108864)

									m_l2Power(27) = CLng(134217728)

									m_l2Power(28) = CLng(268435456)

									m_l2Power(29) = CLng(536870912)

									m_l2Power(30) = CLng(1073741824)

									Dim x

									Dim k

									Dim AA

									Dim BB

									Dim CC

									Dim DD

									Dim a

									Dim b

									Dim c

									Dim d

									Const S11 = 7

									Const S12 = 12

									Const S13 = 17

									Const S14 = 22

									Const S21 = 5

									Const S22 = 9

									Const S23 = 14

									Const S24 = 20

									Const S31 = 4

									Const S32 = 11

									Const S33 = 16

									Const S34 = 23

									Const S41 = 6

									Const S42 = 10

									Const S43 = 15

									Const S44 = 21

									x = ConvertToWordArray(sMessage)

									a = &H67452301

									b = &HEFCDAB89

									c = &H98BADCFE

									d = &H10325476

									For k = 0 To UBound(x) Step 16

									AA = a

									BB = b

									CC = c

									DD = d

									md5_FF a, b, c, d, x(k + 0), S11, &HD76AA478

									md5_FF d, a, b, c, x(k + 1), S12, &HE8C7B756

									md5_FF c, d, a, b, x(k + 2), S13, &H242070DB

									md5_FF b, c, d, a, x(k + 3), S14, &HC1BDCEEE

									md5_FF a, b, c, d, x(k + 4), S11, &HF57C0FAF

									md5_FF d, a, b, c, x(k + 5), S12, &H4787C62A

									md5_FF c, d, a, b, x(k + 6), S13, &HA8304613

									md5_FF b, c, d, a, x(k + 7), S14, &HFD469501

									md5_FF a, b, c, d, x(k + 8), S11, &H698098D8

									md5_FF d, a, b, c, x(k + 9), S12, &H8B44F7AF

									md5_FF c, d, a, b, x(k + 10), S13, &HFFFF5BB1

									md5_FF b, c, d, a, x(k + 11), S14, &H895CD7BE

									md5_FF a, b, c, d, x(k + 12), S11, &H6B901122

									md5_FF d, a, b, c, x(k + 13), S12, &HFD987193

									md5_FF c, d, a, b, x(k + 14), S13, &HA679438E

									md5_FF b, c, d, a, x(k + 15), S14, &H49B40821

									md5_GG a, b, c, d, x(k + 1), S21, &HF61E2562

									md5_GG d, a, b, c, x(k + 6), S22, &HC040B340

									md5_GG c, d, a, b, x(k + 11), S23, &H265E5A51

									md5_GG b, c, d, a, x(k + 0), S24, &HE9B6C7AA

									md5_GG a, b, c, d, x(k + 5), S21, &HD62F105D

									md5_GG d, a, b, c, x(k + 10), S22, &H2441453

									md5_GG c, d, a, b, x(k + 15), S23, &HD8A1E681

									md5_GG b, c, d, a, x(k + 4), S24, &HE7D3FBC8

									md5_GG a, b, c, d, x(k + 9), S21, &H21E1CDE6

									md5_GG d, a, b, c, x(k + 14), S22, &HC33707D6

									md5_GG c, d, a, b, x(k + 3), S23, &HF4D50D87

									md5_GG b, c, d, a, x(k + 8), S24, &H455A14ED

									md5_GG a, b, c, d, x(k + 13), S21, &HA9E3E905

									md5_GG d, a, b, c, x(k + 2), S22, &HFCEFA3F8

									md5_GG c, d, a, b, x(k + 7), S23, &H676F02D9

									md5_GG b, c, d, a, x(k + 12), S24, &H8D2A4C8A

									md5_HH a, b, c, d, x(k + 5), S31, &HFFFA3942

									md5_HH d, a, b, c, x(k + 8), S32, &H8771F681

									md5_HH c, d, a, b, x(k + 11), S33, &H6D9D6122

									md5_HH b, c, d, a, x(k + 14), S34, &HFDE5380C

									md5_HH a, b, c, d, x(k + 1), S31, &HA4BEEA44

									md5_HH d, a, b, c, x(k + 4), S32, &H4BDECFA9

									md5_HH c, d, a, b, x(k + 7), S33, &HF6BB4B60

									md5_HH b, c, d, a, x(k + 10), S34, &HBEBFBC70

									md5_HH a, b, c, d, x(k + 13), S31, &H289B7EC6

									md5_HH d, a, b, c, x(k + 0), S32, &HEAA127FA

									md5_HH c, d, a, b, x(k + 3), S33, &HD4EF3085

									md5_HH b, c, d, a, x(k + 6), S34, &H4881D05

									md5_HH a, b, c, d, x(k + 9), S31, &HD9D4D039

									md5_HH d, a, b, c, x(k + 12), S32, &HE6DB99E5

									md5_HH c, d, a, b, x(k + 15), S33, &H1FA27CF8

									md5_HH b, c, d, a, x(k + 2), S34, &HC4AC5665

									md5_II a, b, c, d, x(k + 0), S41, &HF4292244

									md5_II d, a, b, c, x(k + 7), S42, &H432AFF97

									md5_II c, d, a, b, x(k + 14), S43, &HAB9423A7

									md5_II b, c, d, a, x(k + 5), S44, &HFC93A039

									md5_II a, b, c, d, x(k + 12), S41, &H655B59C3

									md5_II d, a, b, c, x(k + 3), S42, &H8F0CCC92

									md5_II c, d, a, b, x(k + 10), S43, &HFFEFF47D

									md5_II b, c, d, a, x(k + 1), S44, &H85845DD1

									md5_II a, b, c, d, x(k + 8), S41, &H6FA87E4F

									md5_II d, a, b, c, x(k + 15), S42, &HFE2CE6E0

									md5_II c, d, a, b, x(k + 6), S43, &HA3014314

									md5_II b, c, d, a, x(k + 13), S44, &H4E0811A1

									md5_II a, b, c, d, x(k + 4), S41, &HF7537E82

									md5_II d, a, b, c, x(k + 11), S42, &HBD3AF235

									md5_II c, d, a, b, x(k + 2), S43, &H2AD7D2BB

									md5_II b, c, d, a, x(k + 9), S44, &HEB86D391

									a = AddUnsigned(a, AA)

									b = AddUnsigned(b, BB)

									c = AddUnsigned(c, CC)

									d = AddUnsigned(d, DD)

									Next

									If stype = 32 Then

									MD5 = LCase(WordToHex(a) & WordToHex(b) & WordToHex(c) & WordToHex(d))

									Else

									MD5 = LCase(WordToHex(b) & WordToHex(c))

									End If

									End Function

									Sub test()

									MsgBox MD5("a", 16) '16位加密

									MsgBox MD5("a", 32) '32位加密

									End Sub