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90 lines
2.6 KiB
Plaintext
90 lines
2.6 KiB
Plaintext
<%
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Option Explicit
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Dim ObjRC4
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Set ObjRC4 = New clsRC4
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ObjRC4.Key = "Joe"
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Response.Write """" & ObjRC4.Crypt("hello") & """"
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Set ObjRC4 = Nothing
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' --------------------------------------
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Class clsRC4
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Private mStrKey
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Private mBytKeyAry(255)
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Private mBytCypherAry(255)
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Private Sub InitializeCypher()
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Dim lBytJump
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Dim lBytIndex
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Dim lBytTemp
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For lBytIndex = 0 To 255
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mBytCypherAry(lBytIndex) = lBytIndex
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Next
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' Switch values of Cypher arround based off of index and Key value
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lBytJump = 0
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For lBytIndex = 0 To 255
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' Figure index To switch
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lBytJump = (lBytJump + mBytCypherAry(lBytIndex) + mBytKeyAry(lBytIndex)) Mod 256
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' Do the switch
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lBytTemp = mBytCypherAry(lBytIndex)
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mBytCypherAry(lBytIndex) = mBytCypherAry(lBytJump)
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mBytCypherAry(lBytJump) = lBytTemp
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Next
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End Sub
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Public Property Let Key(ByRef pStrKey)
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Dim lLngKeyLength
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Dim lLngIndex
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If pStrKey = mStrKey Then Exit Property
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lLngKeyLength = Len(pStrKey)
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If lLngKeyLength = 0 Then Exit Property
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mStrKey = pStrKey
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lLngKeyLength = Len(pStrKey)
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For lLngIndex = 0 To 255
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mBytKeyAry(lLngIndex) = Asc(Mid(pStrKey, ((lLngIndex) Mod (lLngKeyLength)) + 1, 1))
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Next
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End Property
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Public Property Get Key()
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Key = mStrKey
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End Property
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Public Function Crypt(ByRef pStrMessage)
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Dim lBytIndex
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Dim lBytJump
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Dim lBytTemp
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Dim lBytY
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Dim lLngT
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Dim lLngX
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' Validate data
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If Len(mStrKey) = 0 Then Exit Function
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If Len(pStrMessage) = 0 Then Exit Function
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Call InitializeCypher()
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lBytIndex = 0
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lBytJump = 0
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For lLngX = 1 To Len(pStrMessage)
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lBytIndex = (lBytIndex + 1) Mod 256 ' wrap index
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lBytJump = (lBytJump + mBytCypherAry(lBytIndex)) Mod 256 ' wrap J+S()
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' Add/Wrap those two
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lLngT = (mBytCypherAry(lBytIndex) + mBytCypherAry(lBytJump)) Mod 256
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' Switcheroo
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lBytTemp = mBytCypherAry(lBytIndex)
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mBytCypherAry(lBytIndex) = mBytCypherAry(lBytJump)
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mBytCypherAry(lBytJump) = lBytTemp
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lBytY = mBytCypherAry(lLngT)
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' Character Encryption ...
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Crypt = Crypt & Chr(Asc(Mid(pStrMessage, lLngX, 1)) Xor lBytY)
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Next
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End Function
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End Class
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%> |