ASP RSA 加解密

RSA.asp

<%
' 在ASP中实现加密与解密,加密方法:根据 RSA
Class clsRSA

    Public PrivateKey
    Public PublicKey
    Public Modulus

    Public Function Crypt(pLngMessage, pLngKey)
        On Error Resume Next
        Dim lLngMod
        Dim lLngResult
        Dim lLngIndex
        If pLngKey Mod 2 = 0 Then
            lLngResult = 1
            For lLngIndex = 1 To pLngKey / 2
                lLngMod = (pLngMessage ^ 2) Mod Modulus
                ' Mod may error on key generation
                lLngResult = (lLngMod * lLngResult) Mod Modulus
                If Err Then Exit Function
            Next
        Else
            lLngResult = pLngMessage
            For lLngIndex = 1 To pLngKey / 2
                lLngMod = (pLngMessage ^ 2) Mod Modulus
                On Error Resume Next
                ' Mod may error on key generation
                lLngResult = (lLngMod * lLngResult) Mod Modulus
                If Err Then Exit Function
            Next
        End If
        Crypt = lLngResult
    End Function

    Public Function Encode(ByVal pStrMessage)
        Dim lLngIndex
        Dim lLngMaxIndex
        Dim lBytAscii
        Dim lLngEncrypted
        lLngMaxIndex = Len(pStrMessage)
        If lLngMaxIndex = 0 Then Exit Function
        For lLngIndex = 1 To lLngMaxIndex
            lBytAscii = Asc(Mid(pStrMessage, lLngIndex, 1))
            lLngEncrypted = Crypt(lBytAscii, PublicKey)
            Encode = Encode & NumberToHex(lLngEncrypted, 4)
        Next
    End Function

    Public Function Decode(ByVal pStrMessage)
        Dim lBytAscii
        Dim lLngIndex
        Dim lLngMaxIndex
        Dim lLngEncryptedData
        Decode = ""
        lLngMaxIndex = Len(pStrMessage)
        For lLngIndex = 1 To lLngMaxIndex Step 4
            lLngEncryptedData = HexToNumber(Mid(pStrMessage, lLngIndex, 4))
            lBytAscii = Crypt(lLngEncryptedData, PrivateKey)
            Decode = Decode & Chr(lBytAscii)
        Next
    End Function

    Private Function NumberToHex(ByRef pLngNumber, ByRef pLngLength)
        NumberToHex = Right(String(pLngLength, "0") & Hex(pLngNumber), pLngLength)
    End Function

    Private Function HexToNumber(ByRef pStrHex)
        HexToNumber = CLng("&h" & pStrHex)
    End Function
End Class

Function encrypt(ByVal value) '字符串加密函数'
    Dim LngKeyE
    Dim LngKeyD
    Dim LngKeyN
    Dim ObjRSA
    LngKeyE = "32823"
    LngKeyD = "20643"
    LngKeyN = "29893"
    Set ObjRSA = New clsRSA
    ObjRSA.PublicKey = LngKeyE
    ObjRSA.Modulus = LngKeyN
    encrypt = ObjRSA.Encode(value)
    Set ObjRSA = Nothing
End Function

Function decrypt(ByVal value) '字符串解密函数'
    Dim LngKeyE
    Dim LngKeyD
    Dim LngKeyN
    Dim ObjRSA

    LngKeyE = "32823"
    LngKeyD = "20643"
    LngKeyN = "29893"
    Set ObjRSA = New clsRSA
    ObjRSA.PrivateKey = LngKeyD
    ObjRSA.Modulus = LngKeyN
    decrypt = ObjRSA.Decode(value)
    Set ObjRSA = Nothing
End Function
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