asp des加密解密代码

<% Class Cls_DES Private IPRule, CPRule, EPRule, PRule, SBox(7), PCRule(1), MvRule Private K(16), L(16), R(16) Private FillCode, DesStatus Private Sub Class_Initialize() DesStatus = -1 FillCode = "0001101" IPRule = "58,50,42,34,26,18,10,2," &_ "60,52,44,36,28,20,12,4," &_ "62,54,46,38,30,22,14,6," &_ "64,56,48,40,32,24,16,8," &_ "57,49,41,33,25,17, 9,1," &_ "59,51,43,35,27,19,11,3," &_ "61,53,45,37,29,21,13,5," &_ "63,55,47,39,31,23,15,7," CPRule = "40, 8,48,16,56,24,64,32," &_ "39, 7,47,15,55,23,63,31," &_ "38, 6,46,14,54,22,62,30," &_ "37, 5,45,13,53,21,61,29," &_ "36, 4,44,12,52,20,60,28," &_ "35, 3,43,11,51,19,59,27," &_ "34, 2,42,10,50,18,58,26," &_ "33, 1,41, 9,49,17,57,25," EPRule = "32, 1, 2, 3, 4, 5," &_ " 4, 5, 6, 7, 8, 9," &_ " 8, 9,10,11,12,13," &_ "12,13,14,15,16,17," &_ "16,17,18,19,20,21," &_ "20,21,22,23,24,25," &_ "24,25,26,27,28,29," &_ "28,29,30,31,32, 1," PRule = "16, 7,20,21,29,12,28,17," &_ " 1,15,23,26, 5,18,31,10," &_ " 2, 8,24,14,32,27, 3, 9," &_ "19,13,30, 6,22,11, 4,25," SBox(0) = "14, 4,13, 1, 2,15,11, 8, 3,10, 6,12, 5, 9, 0, 7," &_ " 0,15, 7, 4,14, 2,13, 1,10, 6,12,11, 9, 5, 3, 8," &_ " 4, 1,14, 8,13, 6, 2,11,15,12, 9, 7, 3,10, 5, 0," &_ "15,12, 8, 2, 4, 9, 1, 7, 5,11, 3,14,10, 0, 6,13," SBox(1) = "15, 1, 8,14, 6,11, 3, 4, 9, 7, 2,13,12, 0, 5,10," &_ " 3,13, 4, 7,15, 2, 8,14,12, 0, 1,10, 6, 9,11, 5," &_ " 0,14, 7,11,10, 4,13, 1, 5, 8,12, 6, 9, 3, 2,15," &_ "13, 8,10, 1, 3,15, 4, 2,11, 6, 7,12, 0, 5,14, 9," SBox(2) = "10, 0, 9,14, 6, 3,15, 5, 1,13,12, 7,11, 4, 2, 8," &_ "13, 7, 0, 9, 3, 4, 6,10, 2, 8, 5,14,12,11,15, 1," &_ "13, 6, 4, 9, 8,15, 3, 0,11, 1, 2,12, 5,10,14, 7," &_ " 1,10,13, 0, 6, 9, 8, 7, 4,15,14, 3,11, 5, 2,12," SBox(3) = " 7,13,14, 3, 0, 6, 9,10, 1, 2, 8, 5,11,12, 4,15," &_ "13, 8,11, 5, 6,15, 0, 3, 4, 7, 2,12, 1,10,14, 9," &_ "10, 6, 9, 0,12,11, 7,13,15, 1, 3,14, 5, 2, 8, 4," &_ " 3,15, 0, 6,10, 1,13, 8, 9, 4, 5,11,12, 7, 2,14," SBox(4) = " 2,12, 4, 1, 7,10,11, 6, 8, 5, 3,15,13, 0,14, 9," &_ "14,11, 2,12, 4, 7,13, 1, 5, 0,15,10, 3, 9, 8, 6," &_ " 4, 2, 1,11,10,13, 7, 8,15, 9,12, 5, 6, 3, 0,14," &_ "11, 8,12, 7, 1,14, 2,13, 6,15, 0, 9,10, 4, 5, 3," SBox(5) = "12, 1,10,15, 9, 2, 6, 8, 0,13, 3, 4,14, 7, 5,11," &_ "10,15, 4, 2, 7,12, 9, 5, 6, 1,13,14, 0,11, 3, 8," &_ " 9,14,15, 5, 2, 8,12, 3, 7, 0, 4,10, 1,13,11, 6," &_ " 4, 3, 2,12, 9, 5,15,10,11,14, 1, 7, 6, 0, 8,13," SBox(6) = " 4,11, 2,14,15, 0, 8,13, 3,12, 9, 7, 5,10, 6, 1," &_ "13, 0,11, 7, 4, 9, 1,10,14, 3, 5,12, 2,15, 8, 6," &_ " 1, 4,11,13,12, 3, 7,14,10,15, 6, 8, 0, 5, 9, 2," &_ " 6,11,13, 8, 1, 4,10, 7, 9, 5, 0,15,14, 2, 3,12," SBox(7) = "13, 2, 8, 4, 6,15,11, 1,10, 9, 3,14, 5, 0,12, 7," &_ " 1,15,13, 8,10, 3, 7, 4,12, 5, 6,11, 0,14, 9, 2," &_ " 7,11, 4, 1, 9,12,14, 2, 0, 6,10,13,15, 3, 5, 8," &_ " 2, 1,14, 7, 4,10, 8,13,15,12, 9, 0, 3, 5, 6,11," PCRule(0) = "57,49,41,33,25,17, 9," &_ " 1,58,50,42,34,26,18," &_ "10, 2,59,51,43,35,27," &_ "19,11, 3,60,52,44,36," &_ "63,55,47,39,31,23,15," &_ " 7,62,54,46,38,30,22," &_ "14, 6,61,53,45,37,29," &_ "21,13, 5,28,20,12, 4," PCRule(1) = "14,17,11,24, 1, 5, 3,28," &_ "15, 6,21,10,23,19,12, 4," &_ "26, 8,16, 7,27,20,13, 2," &_ "41,52,31,37,47,55,30,40," &_ "51,45,33,48,44,49,39,56," &_ "34,53,46,42,50,36,29,32," MvRule = "1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1" End Sub Private Function Permute(ByVal Rule, ByVal Text) Dim P_Rule, Num, PText PText = "" P_Rule = Split(Rule, ",") For Each Num In P_Rule Num = Trim(Num) & "" If Num <> "" Then Num = CLng(Num) PText = PText & Mid(Text, Num, 1) End If Next Erase P_Rule Permute = PText End Function Private Function CreateKey() Dim IPKey, C(16), D(16), i, Mv_Rule, MvLen IPKey = Permute(PCRule(0), K(0)) C(0) = Left(IPKey, 28) D(0) = Right(IPKey, 28) Mv_Rule = Split(MvRule, ",") For i = 1 To 16 MvLen = CLng(Trim(Mv_Rule(i - 1))) C(i) = Right(C(i -1), Len(C(i -1)) - MvLen) & Left(C(i -1), MvLen) D(i) = Right(D(i -1), Len(D(i -1)) - MvLen) & Left(D(i -1), MvLen) K(i) = Permute(PCRule(1), C(i) & D(i)) Next End Function Private Function IP(ByVal Text) Dim IPText IPText = Permute(IPRule, Text) L(0) = Left(IPText, 32) R(0) = Right(IPText, 32) IP = IPText End Function Private Function IterativeLR() Dim i For i = 1 To 16 L(i) = R(i - 1) R(i) = B_XOR(L(i - 1), F(R(i - 1), K(i))) Next End Function Private Function F(ByVal RText, ByVal Keys) Dim EPText, XORText, Result, SKey(7), i, x, y Result = "" EPText = Permute(EPRule, RText) XORText = B_XOR(EPText, Keys) For i = 1 To Len(XORText) \ 6 SKey(i - 1) = Mid(XORText, (i - 1) * 6 + 1, 6) x = BinaryToDecimal(Left(SKey(i - 1), 1) & Right(SKey(i - 1), 1)) y = BinaryToDecimal(Mid(SKey(i - 1), 2, 4)) SKey(i - 1) = DecimalToBinary(Trim(Split(SBox(i -1), ",")(x * 16 + y))) If Len(SKey(i - 1)) < 4 Then Select Case (4 - Len(SKey(i - 1))) Case 1 SKey(i - 1) = "0" & SKey(i - 1) Case 2 SKey(i - 1) = "00" & SKey(i - 1) Case 3 SKey(i - 1) = "000" & SKey(i - 1) End Select End If Result = Result & SKey(i - 1) Next Result = Permute(PRule, Result) F = Result End Function Private Function B_XOR(ByVal Expression1, ByVal Expression2) Dim E, K, i, XORText XORText = "" E = Trim(Expression1) & "" K = Trim(Expression2) & "" For i = 1 To Len(K) XORText = XORText & CStr(CInt(Mid(E, i, 1)) Xor CInt(Mid(K, i, 1))) Next B_XOR = XORText End Function Private Function BinaryToDecimal(ByVal binNum) Dim Binary, Decimal, i, Length Decimal = 0 Binary = Trim(binNum) & "" If Binary <> "" Then While Left(Binary, 1) = "0" Binary = Right(Binary, Len(Binary) - 1) Wend Length = Len(Binary) For i = 1 To Length Decimal = Decimal + CInt(Mid(Binary, i, 1)) * 2^(Length - i) Next End If BinaryToDecimal = Decimal End Function Private Function DecimalToBinary(ByVal decNum) Dim Decimal, Binary, division Binary = "" Decimal = Trim(decNum) & "" If Decimal <> "" Then Decimal = CLng(Decimal) While Decimal > 1 Binary = Binary & CStr(Decimal Mod 2) Decimal = Decimal \ 2 Wend Binary = StrReverse(Binary & Decimal) E