i am decrypting the credit card number and storing it in a JSON string but the decryption is not working properly .

[GUPIEZ]

Xml might have multiple entries of Credit Card. It is able to decrypt but the card number reflects different numbers like 4444333322221111 becomes 4444329671171111 . in my local I created a sample app and it was working fine. The other details are coming fine .Only the credit card numbers either get jumbled up or one of them comes as empty.

GetNode is used to fetch inner text and attribute values from xml string

Protected Sub CC_Payment(ByVal version As String)
If version = CNST_V1 Then

isMigrated = True


Dim strUseForSvcFee As String = ""
Dim strUseForTransfer As String = ""
Dim strCardNumber As String = ""
Dim strExpirationMonth As String = ""
Dim strExpirationYear As String = ""
Dim strNameOnCard As String = ""
Dim strVendor As String = ""
Dim strUseforINV As String = ""
Dim strUseForCar As String = ""
Dim strUseForHTL As String = ""
Dim strUseforRAIL As String = ""
Dim strUseforWEB As String = ""
Dim EncryptedCCNumber As String = ""
Dim DecryptedVal As String = ""
Dim privateKeyFile As String = System.AppDomain.CurrentDomain.BaseDirectory + "PrivateKey2.xml"



Dim listCard As New List(Of CreditCard)

For n = 1 To 3


If Not IsNothing(GetNode(strXml, "//ns:OTA_ProfileCreateRQ/nsrofile/ns:Customer/nsaymentForm[" & n & "]")) Then

EncryptedCCNumber = GetNode(strXml, "//ns:OTA_ProfileCreateRQ/nsrofile/ns:Customer/nsaymentForm[" & n & "]/nsaymentCard/ns:CardNumber").Attributes("EncryptedValue").Value
DecryptedVal = Decrypt(EncryptedCCNumber, privateKeyFile)

strCardNumber = DecryptedVal

strVendor = ReformatCCVendor(GetNode(strXml, "//ns:OTA_ProfileCreateRQ/nsrofile/ns:Customer/nsaymentForm[" & n & "]/nsaymentCard/ns:CardType").Attributes("Code").Value)

getvalue = GetNode(strXml, "//ns:OTA_ProfileCreateRQ/nsrofile/ns:Customer/nsaymentForm[" & n & "]/nsaymentCard").Attributes("ExpireDate").Value

strExpirationYear = Mid(getvalue, 3, 2) & "#" & Left(getvalue, 4)

If strExpirationYear = "#" Then
strExpirationYear = ""
End If

strExpirationMonth = Mid(getvalue, 6, 2)


strNameOnCard = GetNode(strXml, "//ns:OTA_ProfileCreateRQ/nsrofile/ns:Customer/nsaymentForm[" & n & "]/nsaymentCard/ns:CardHolderName").InnerText


If Not String.IsNullOrEmpty(strCardNumber) OrElse Not String.IsNullOrEmpty(strNameOnCard) OrElse String.IsNullOrEmpty(strVendor) Then

Dim cards As New CreditCard
cards.Index = listCard.Count + 1

cards.CardNumber = strCardNumber

cards.ExpirationMonth = strExpirationMonth

cards.ExpirationYear = strExpirationYear

cards.NameOnCard = strNameOnCard



If Not AllElementsBlank(cards, GetType(CreditCard)) Then
listCard.Add(cards)
End If
End If
End If
Next

If Not IsNothing(listCard) AndAlso listCard.Count > 0 Then
getvalue = JsonConvert.SerializeObject(listCard)
getvalue = "{""" + "CreditCards" + """:" + getvalue + "}"

End If




Else
'Do nothing
End If
End Sub


Public Function Decrypt(ByVal EncryptedCCNumber As String, ByVal privateKeyFile As String) As String

Dim Encrypted As Byte() = Convert.FromBase64String(EncryptedCCNumber)

Dim decodedtxt As Byte()
Dim decrypted As String = ""

Using rsa = New RSACryptoServiceProvider(CInt(2048))
rsa.PersistKeyInCsp = False
Dim privateKey As String = System.IO.File.ReadAllText(privateKeyFile)
rsa.FromXmlString(privateKey)
decodedtxt = rsa.Decrypt(Encrypted, False)
End Using

decrypted = System.Text.Encoding.UTF8.GetString(decodedtxt)
Return decrypted


End Function

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