VBA MD5加密算法（转）

Private Const BITS_TO_A_BYTE =
Private Const BYTES_TO_A_WORD =
Private Const BITS_TO_A_WORD = 

Private m_lOnBits()
Private m_l2Power()

Private Function LShift(lValue, iShiftBits)
If iShiftBits =  Then
LShift = lValue
Exit Function
ElseIf iShiftBits =  Then
If lValue And  Then
LShift = &H80000000
Else
LShift =
End If
Exit Function
ElseIf iShiftBits <  Or iShiftBits >  Then
Err.Raise
End If

If (lValue And m_l2Power( - iShiftBits)) Then
LShift = ((lValue And m_lOnBits( - (iShiftBits + ))) * m_l2Power(iShiftBits)) Or &H80000000
Else
LShift = ((lValue And m_lOnBits( - iShiftBits)) * m_l2Power(iShiftBits))
End If
End Function

Private Function RShift(lValue, iShiftBits)
If iShiftBits =  Then
RShift = lValue
Exit Function
ElseIf iShiftBits =  Then
If lValue And &H80000000 Then
RShift =
Else
RShift =
End If
Exit Function
ElseIf iShiftBits <  Or iShiftBits >  Then
Err.Raise
End If

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

If (lValue And &H80000000) Then
RShift = (RShift Or (&H40000000 \ m_l2Power(iShiftBits - )))
End If
End Function

Private Function RotateLeft(lValue, iShiftBits)
RotateLeft = LShift(lValue, iShiftBits) Or RShift(lValue, ( - 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 =
Const CONGRUENT_BITS = 

lMessageLength = Len(sMessage)

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

lBytePosition =
lByteCount =
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 + , )), lBytePosition)
lByteCount = lByteCount +
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 - ) = LShift(lMessageLength, )
lWordArray(lNumberOfWords - ) = RShift(lMessageLength, )

ConvertToWordArray = lWordArray
End Function

Private Function WordToHex(lValue)
Dim lByte
Dim lCount

For lCount =  To
lByte = RShift(lValue, lCount * BITS_TO_A_BYTE) And m_lOnBits(BITS_TO_A_BYTE - )
WordToHex = WordToHex & Right("" & Hex(lByte), )
Next
End Function

Public Function MD5(sMessage, stype)
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()
m_lOnBits() = CLng()

m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()
m_l2Power() = CLng()

Dim x
Dim k
Dim AA
Dim BB
Dim CC
Dim DD
Dim a
Dim b
Dim c
Dim d

Const S11 =
Const S12 =
Const S13 =
Const S14 =
Const S21 =
Const S22 =
Const S23 =
Const S24 =
Const S31 =
Const S32 =
Const S33 =
Const S34 =
Const S41 =
Const S42 =
Const S43 =
Const S44 = 

x = ConvertToWordArray(sMessage)

a = &H67452301
b = &HEFCDAB89
c = &H98BADCFE
d = &H10325476

For k =  To UBound(x) Step
AA = a
BB = b
CC = c
DD = d

md5_FF a, b, c, d, x(k + ), S11, &HD76AA478
md5_FF d, a, b, c, x(k + ), S12, &HE8C7B756
md5_FF c, d, a, b, x(k + ), S13, &H242070DB
md5_FF b, c, d, a, x(k + ), S14, &HC1BDCEEE
md5_FF a, b, c, d, x(k + ), S11, &HF57C0FAF
md5_FF d, a, b, c, x(k + ), S12, &H4787C62A
md5_FF c, d, a, b, x(k + ), S13, &HA8304613
md5_FF b, c, d, a, x(k + ), S14, &HFD469501
md5_FF a, b, c, d, x(k + ), S11, &H698098D8
md5_FF d, a, b, c, x(k + ), S12, &H8B44F7AF
md5_FF c, d, a, b, x(k + ), S13, &HFFFF5BB1
md5_FF b, c, d, a, x(k + ), S14, &H895CD7BE
md5_FF a, b, c, d, x(k + ), S11, &H6B901122
md5_FF d, a, b, c, x(k + ), S12, &HFD987193
md5_FF c, d, a, b, x(k + ), S13, &HA679438E
md5_FF b, c, d, a, x(k + ), S14, &H49B40821

md5_GG a, b, c, d, x(k + ), S21, &HF61E2562
md5_GG d, a, b, c, x(k + ), S22, &HC040B340
md5_GG c, d, a, b, x(k + ), S23, &H265E5A51
md5_GG b, c, d, a, x(k + ), S24, &HE9B6C7AA
md5_GG a, b, c, d, x(k + ), S21, &HD62F105D
md5_GG d, a, b, c, x(k + ), S22, &H2441453
md5_GG c, d, a, b, x(k + ), S23, &HD8A1E681
md5_GG b, c, d, a, x(k + ), S24, &HE7D3FBC8
md5_GG a, b, c, d, x(k + ), S21, &H21E1CDE6
md5_GG d, a, b, c, x(k + ), S22, &HC33707D6
md5_GG c, d, a, b, x(k + ), S23, &HF4D50D87
md5_GG b, c, d, a, x(k + ), S24, &H455A14ED
md5_GG a, b, c, d, x(k + ), S21, &HA9E3E905
md5_GG d, a, b, c, x(k + ), S22, &HFCEFA3F8
md5_GG c, d, a, b, x(k + ), S23, &H676F02D9
md5_GG b, c, d, a, x(k + ), S24, &H8D2A4C8A

md5_HH a, b, c, d, x(k + ), S31, &HFFFA3942
md5_HH d, a, b, c, x(k + ), S32, &H8771F681
md5_HH c, d, a, b, x(k + ), S33, &H6D9D6122
md5_HH b, c, d, a, x(k + ), S34, &HFDE5380C
md5_HH a, b, c, d, x(k + ), S31, &HA4BEEA44
md5_HH d, a, b, c, x(k + ), S32, &H4BDECFA9
md5_HH c, d, a, b, x(k + ), S33, &HF6BB4B60
md5_HH b, c, d, a, x(k + ), S34, &HBEBFBC70
md5_HH a, b, c, d, x(k + ), S31, &H289B7EC6
md5_HH d, a, b, c, x(k + ), S32, &HEAA127FA
md5_HH c, d, a, b, x(k + ), S33, &HD4EF3085
md5_HH b, c, d, a, x(k + ), S34, &H4881D05
md5_HH a, b, c, d, x(k + ), S31, &HD9D4D039
md5_HH d, a, b, c, x(k + ), S32, &HE6DB99E5
md5_HH c, d, a, b, x(k + ), S33, &H1FA27CF8
md5_HH b, c, d, a, x(k + ), S34, &HC4AC5665

md5_II a, b, c, d, x(k + ), S41, &HF4292244
md5_II d, a, b, c, x(k + ), S42, &H432AFF97
md5_II c, d, a, b, x(k + ), S43, &HAB9423A7
md5_II b, c, d, a, x(k + ), S44, &HFC93A039
md5_II a, b, c, d, x(k + ), S41, &H655B59C3
md5_II d, a, b, c, x(k + ), S42, &H8F0CCC92
md5_II c, d, a, b, x(k + ), S43, &HFFEFF47D
md5_II b, c, d, a, x(k + ), S44, &H85845DD1
md5_II a, b, c, d, x(k + ), S41, &H6FA87E4F
md5_II d, a, b, c, x(k + ), S42, &HFE2CE6E0
md5_II c, d, a, b, x(k + ), S43, &HA3014314
md5_II b, c, d, a, x(k + ), S44, &H4E0811A1
md5_II a, b, c, d, x(k + ), S41, &HF7537E82
md5_II d, a, b, c, x(k + ), S42, &HBD3AF235
md5_II c, d, a, b, x(k + ), S43, &H2AD7D2BB
md5_II b, c, d, a, x(k + ), S44, &HEB86D391

a = AddUnsigned(a, AA)
b = AddUnsigned(b, BB)
c = AddUnsigned(c, CC)
d = AddUnsigned(d, DD)
Next

If stype =  Then
MD5 = LCase(WordToHex(a) & WordToHex(b) & WordToHex(c) & WordToHex(d))
Else
MD5 = LCase(WordToHex(b) & WordToHex(c))
End If
End Function
Sub test()
Dim i As String
i = InputBox("Please input a password:")
If MD5(i, ) = MD5("abc", ) Or MD5(i, ) = MD5("abc", ) Then: MsgBox "Ok": Else: MsgBox "failed": End
'MsgBox MD5("abc", 16) '16λ¼ÓÃÜ
'MsgBox MD5("abc", 32) '32λ¼ÓÃÜ
End Sub