.net中实现与ASP完全兼容的MD5算法(2)

Private Function G(x, y, z)

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

End Function

Private Function H(x, y, z)

H = (x Xor y Xor z)

End Function

Private Function I(x, y, z)

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

End Function

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

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

a = RotateLeft(a, s)

a = AddUnsigned(a, b)

End Sub

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

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

a = RotateLeft(a, s)

a = AddUnsigned(a, b)

End Sub

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

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

a = RotateLeft(a, s)

a = AddUnsigned(a, b)

End Sub

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

a = AddUnsigned(a, AddUnsigned(AddUnsigned(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 calcMD5(sMessage)

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



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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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



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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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



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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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



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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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    

calcMD5 = LCase(WordToHex(a) & WordToHex(b) & WordToHex(c) & WordToHex(d))

End Function

%>

这段代码，只需要复制到VB ActiveX DLL项目中，将变量初始化的代码移到类初始化的位置编译即可生成同样算法的非托管COM组件。

在.net中，引用COM组件，并使用如下方法进行调用：