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这仅仅是笔记,仅为了方便查阅而已。

 
 
 

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VB 字符串MD5校验  

2010-06-28 12:21:01|  分类: 编程相关 |  标签: |举报 |字号 订阅

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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)
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


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

Private Sub cmdEncode_Click()
Text2.Text
= UCase(MD5(Text1.Text))'调用
End Sub

Private Sub Form_Load()
frmMd5.Caption
= "VB MD5加密算法"
End Sub
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