MD5不可逆加密算法的ASP实现实例


此为国外转载函数，可将任意字符转换为md5 16为字符加密形式，而且为不可逆转换。 
代码:
<% 
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(l＆#118alue, iShiftBits) 
If iShiftBits = 0 Then 
LShift = l＆#118alue 
Exit Function 
ElseIf iShiftBits = 31 Then 
If l＆#118alue 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 (l＆#118alue And m_l2Power(31 - iShiftBits)) Then 
LShift = ((l＆#118alue And m_lOnBits(31 - (iShiftBits + 1))) * m_l2Power(iShiftBits)) Or &H80000000 
Else 
LShift = ((l＆#118alue And m_lOnBits(31 - iShiftBits)) * m_l2Power(iShiftBits)) 
End If 
End Function 
Private Function RShift(l＆#118alue, iShiftBits) 
If iShiftBits = 0 Then 
RShift = l＆#118alue 
Exit Function 
ElseIf iShiftBits = 31 Then 
If l＆#118alue 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 = (l＆#118alue And &H7FFFFFFE)  m_l2Power(iShiftBits) 
If (l＆#118alue And &H80000000) Then 
RShift = (RShift Or (&H40000000  m_l2Power(iShiftBits - 1))) 
End If 
End Function 
Private Function RotateLeft(l＆#118alue, iShiftBits) 
RotateLeft = LShift(l＆#118alue, iShiftBits) Or RShift(l＆#118alue, (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(l＆#118alue) 
Dim lByte 
Dim lCount 
For lCount = 0 To 3 
lByte = RShift(l＆#118alue, lCount * BITS_TO_A_BYTE) And m_lOnBits(BITS_TO_A_BYTE - 1) 
WordToHex = WordToHex & Right(0 & Hex(lByte), 2) 
Next 
End Function 
 
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MD5不可逆加密算法的ASP实现实例（一） 
-------------------------------------- 
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,

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