发信人: plindge()
整理人: fishy(2000-05-23 14:12:06), 站内信件
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'************************************************
'* 欢迎光临品琳居 http://plindge.yeah.net *
'************************************************
' 经典加密算法在VB中的实现（3）- RC4
Public Sub main()
Dim key As String
For i = 1 To 16
Randomize
key = key & Chr(Rnd * 255)
Next i
MsgBox RC4(RC4("Welcome To Plindge Studio!", key), key)
End Sub
Public Function RC4(inp As String, key As String) As String
Dim S(0 To 255) As Byte, K(0 To 255) As Byte, i As Long
Dim j As Long, temp As Byte, Y As Byte, t As Long, x As Long
Dim Outp As String
For i = 0 To 255
S(i) = i
Next
j = 1
For i = 0 To 255
If j > Len(key) Then j = 1
K(i) = Asc(Mid(key, j, 1))
j = j + 1
Next i
j = 0
For i = 0 To 255
j = (j + S(i) + K(i)) Mod 256
temp = S(i)
S(i) = S(j)
S(j) = temp
Next i
i = 0
j = 0
For x = 1 To Len(inp)
i = (i + 1) Mod 256
j = (j + S(i)) Mod 256
temp = S(i)
S(i) = S(j)
S(j) = temp
t = (S(i) + (S(j) Mod 256)) Mod 256
Y = S(t)
Outp = Outp & Chr(Asc(Mid(inp, x, 1)) Xor Y)
Next
RC4 = Outp
End Function
'To Be Continue
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