今天在在网页的源代码中找到了MD5加密算法的代码，呵呵，搬过来VB用了～～
直接调用就可以了
‘使用例子msgbox md5(“加密的字符串”)
Private Const BITS_TO_A_BYTE = 8
PrivateConst BYTES_TO_A_WORD = 4
Private Const BITS_TO_A_WORD = 32
Privatem_lOnBits(30)
Private m_l2Power(30)
Private FunctionLShift(lValue, iShiftBits)
If iShiftBits = 0 Then
LShift = lValue
ExitFunction
ElseIf iShiftBits = 31 Then
If lValue And 1 Then
LShift= &H80000000
Else
LShift = 0
End If
Exit Function
ElseIfiShiftBits < 0 or iShiftBits > 31 Then
Err.Raise 6
End If
If(lValue And m_l2Power(31 – iShiftBits)) Then
LShift = ((lValue Andm_lOnBits(31 – (iShiftBits + 1))) * m_l2Power(iShiftBits)) or&H80000000
Else
LShift = ((lValue And m_lOnBits(31 –iShiftBits)) * m_l2Power(iShiftBits))
End If
End Function
PrivateFunction RShift(lValue, iShiftBits)
If iShiftBits = 0 Then
RShift= lValue
Exit Function
ElseIf iShiftBits = 31 Then
If lValueAnd &H80000000 Then
RShift = 1
Else
RShift = 0
End If
ExitFunction
ElseIf iShiftBits < 0 or iShiftBits > 31 Then
Err.Raise6
End If
RShift = (lValue And &H7FFFFFFE) m_l2Power(iShiftBits)
If (lValue And &H80000000) Then
RShift =(RShift or (&H40000000 \ m_l2Power(iShiftBits – 1)))
End If
EndFunction
Private Function RotateLeft(lValue, iShiftBits)
RotateLeft= LShift(lValue, iShiftBits) or RShift(lValue, (32 – iShiftBits))
EndFunction
Private Function AddUnsigned(lX, lY)
Dim lX4
Dim lY4
DimlX8
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 lResultAnd &H40000000 Then
lResult = lResult Xor &HC0000000 Xor lX8Xor lY8
Else
lResult = lResult Xor &H40000000 Xor lX8 Xor lY8
EndIf
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 Functionmd5_G(x, y, z)
md5_G = (x And z) or (y And (Not z))
End Function
PrivateFunction md5_H(x, y, z)
md5_H = (x Xor y Xor z)
End Function
PrivateFunction md5_I(x, y, z)
md5_I = (y Xor (x or (Not z)))
EndFunction
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 Submd5_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
PrivateSub 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 FunctionConvertToWordArray(sMessage)
Dim lMessageLength
Dim lNumberOfWords
DimlWordArray()
Dim lBytePosition
Dim lByteCount
Dim lWordCount
ConstMODULUS_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)
ReDimlWordArray(lNumberOfWords – 1)
lBytePosition = 0
lByteCount = 0
DoUntil lByteCount >= lMessageLength
lWordCount = lByteCount BYTES_TO_A_WORD
lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) *BITS_TO_A_BYTE
lWordArray(lWordCount) = lWordArray(lWordCount) orLShift(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
EndFunction
Private Function WordToHex(lValue)
Dim lByte
DimlCount
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
PublicFunction MD5(sMessage)
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
DimDD
Dim a
Dim b
Dim c
Dim d
Const S11 = 7
ConstS12 = 12
Const S13 = 17
Const S14 = 22
Const S21 = 5
ConstS22 = 9
Const S23 = 14
Const S24 = 20
Const S31 = 4
ConstS32 = 11
Const S33 = 16
Const S34 = 23
Const S41 = 6
ConstS42 = 10
Const S43 = 15
Const S44 = 21
x =ConvertToWordArray(sMessage)
a = &H67452301
b =&HEFCDAB89
c = &H98BADCFE
d = &H10325476
For k = 0To UBound(x) Step 16
AA = a
BB = b
CC = c
DD = d
md5_FFa, 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_FFa, 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_FFa, 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_FFa, 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_GGa, 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_GGa, 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_GGa, 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_GGa, 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_HHa, 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_HHa, 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_HHa, 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_HHa, 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_IIa, 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_IIa, 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_IIa, 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_IIa, 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
‘MD5 = LCase(WordToHex(a)& WordToHex(b) & WordToHex(c) & WordToHex(d))
MD5=LCase(WordToHex(b)& WordToHex(c)) ‘I crop this to fit 16byte database password
End Function
