Here's the code I am not sure if there's any hidden error but on runtime when trying to import the rsa parameters it pops up that error
Imports System.Security.Cryptography
Imports System.Security
Imports System.Text
Imports System.IO
Public Class RSA_Test_Form
Public FactorList As New List(Of Integer)
Public FindFactor As Long
Public PString, QString, ModulusString, ExponentString, DString, DPString,
DQString, InverseQString As String
Function ModInverse(ByVal a As Long, ByVal b As Long) As Long
Dim b0 As Long = b
Dim t As Long
Dim q As Long
Dim x0 As Long = 0
Dim x1 As Long = 1
If b = 1 Then Return 1
While a > 1
q = a \ b
t = b
b = a Mod b
a = t
t = x0
x0 = x1 - q * x0
x1 = t
End While
If x1 < 0 Then x1 += b0
Return x1
End Function
Function gcd(ByVal n1 As Long, ByVal n2 As Long) As Long
Dim i As Integer
Dim minimum As Integer
If n1 < n2 Then
minimum = n1
Else
minimum = n2
End If
For i = minimum To 1 Step -1
If n1 Mod i = 0 And n2 Mod i = 0 Then
Return i
End If
Next
Return gcd
End Function
Sub FindFactorFunction()
Dim x As Long
For x = 2 To FindFactor - 1
If FindFactor Mod x = 0 Then
FactorList.Add(x)
End If
Next
End Sub
Private Sub GenerateBTN_Click(sender As Object, e As EventArgs) Handles GenerateBTN.Click
Dim Result As Long = 0
Dim Result2 As Long = 0
Dim Result3 As Long = 0
Dim Random1, Random2 As New Random()
Dim P, Q, Modulus As Long
Dim Exponent, D, DP, DQ As New Nullable(Of Long)
Dim InverseQ As New Nullable(Of ULong)
Dim Modulus1 As Long = 0
Dim LoopCount As Integer = 0
Dim ls, ls2 As New List(Of Long)
Dim PrimeString As String
PrimeString = ""
Using MyNewStreamReader As StreamReader = New StreamReader("AllPrimes.txt")
PrimeString = MyNewStreamReader.ReadLine().ToString
MessageBox.Show(PrimeString)
While PrimeString <> "" And LoopCount <= 1249
ls.Add(Long.Parse(PrimeString))
LoopCount += 1
PrimeString = ""
PrimeString = MyNewStreamReader.ReadLine
End While
End Using
Using MyNewStreamReader2 As StreamReader = New StreamReader("AllPrimes.txt")
PrimeString = ""
PrimeString = MyNewStreamReader2.ReadLine().ToString
LoopCount = 0
MessageBox.Show(PrimeString)
While PrimeString <> ""
If LoopCount >= 1250 And LoopCount <= 2499 Then
ls2.Add(Long.Parse(PrimeString))
End If
LoopCount += 1
PrimeString = ""
PrimeString = MyNewStreamReader2.ReadLine
End While
End Using
Dim rand = Random1.Next(0, ls.Count)
Dim rand2 = Random2.Next(0, ls2.Count)
P = ls(rand)
Q = ls2(rand2)
Result3 = gcd(P, Q)
While Result3 <> 1
rand = Random1.Next(0, ls.Count)
rand2 = Random2.Next(0, ls2.Count)
P = ls(rand)
Q = ls2(rand2)
Result3 = gcd(P, Q)
End While
MessageBox.Show("P= " & P & "Q= " & Q)
Modulus = (P - 1) * (Q - 1)
Modulus1 = Modulus + 1
FindFactor = Modulus1
FindFactorFunction()
Dim Count As Integer = 0
Dim Count2 As Integer = 0
For A As Integer = 0 To FactorList.Count - 1
Result = gcd(FactorList.ElementAt(A), Modulus)
If Result = 1 Then
Count += 1
End If
Next
Dim PositionArray(Count) As Integer
Count = 0
For A As Integer = 0 To FactorList.Count - 1
Result = gcd(FactorList.ElementAt(A), Modulus)
If Result = 1 Then
PositionArray(Count) = FactorList.ElementAt(A)
Count += 1
End If
Next
Dim Number1, Number2 As Long
Dim GetResult As Boolean = False
Count = 0
If PositionArray.Count = 2 Then
Exponent = PositionArray(0)
D = PositionArray(1)
Else
While GetResult = False And Count <> PositionArray.Count
For Count = 0 To PositionArray.Count - 1
For Count2 = Count + 1 To PositionArray.Count - 1
Number1 = PositionArray(Count)
Number2 = PositionArray(Count2)
Result2 = Number1 * Number2 Mod Modulus
If Result2 = 1 Then
GetResult = True
End If
If GetResult = True Then
Exit While
End If
Next
Next
End While
End If
Dim Selection As Integer = MessageBox.Show(Number1 & "=E And D= " & Number2, "Information", MessageBoxButtons.OKCancel, MessageBoxIcon.Information)
If Selection = DialogResult.OK Then
Exponent = Number1
D = Number2
DP = D * P
DQ = D * Q
InverseQ = ModInverse(Q, P)
MessageBox.Show("DP= " & DP)
MessageBox.Show("DQ= " & DQ)
MessageBox.Show("InverseQ= " & InverseQ)
In here when generating RSA numbers, I can not always get the correct numbers so i am using this website to check that i have get the correct RSA numbers and the D and Exponent was not = 0
Exponent=e
Everytime I get Exponent and D, I will always use this website to check P,Q,Exponent and D to make sure it's correct
https://www.cs.drexel.edu/~jpopyack/IntroCS/HW/RSAWorksheet.html
End If
If Exponent.HasValue And D.HasValue Then
PString = P.ToString
QString = Q.ToString
ModulusString = Modulus.ToString
ExponentString = Exponent.ToString
DString = D.ToString
DPString = DP.ToString
DQString = DQ.ToString
InverseQString = InverseQ.ToString
In here all D,P,Q,DP,DQ,Exponent,Modulus,InverseQ value has been calculated and checked
End If
End Sub
Private Sub Number2ByteConverterBTN_Click(sender As Object, e As EventArgs) Handles Number2ByteConverterBTN.Click
If it's possible try check the coding here, perhaps this place was the place that i do it wrongly
I initially thought of using BitCoverter.GetBytes() to convert the long and Ulong datatype value
But in the end, the bitconverter.getbytes() doesn't work for me so i have to first convert all those long and ulong data type values into string then use BYTE.PARSE() to convert the string into byte value
That's how i do it
If let's any experts here confirmed that the coding above worked and all the values are correct then try to check is there any potential error here
Dim PByte, QByte, ModulusByte, ExponentByte, DByte, DPByte, DQByte, InverseQByte As Byte()
ReDim PByte(PString.Count)
ReDim QByte(QString.Count)
ReDim ModulusByte(ModulusString.Count)
ReDim ExponentByte(ExponentString.Count)
ReDim DByte(DString.Count)
ReDim DPByte(DPString.Count)
ReDim DQByte(DQString.Count)
ReDim InverseQByte(InverseQString.Count)
Dim TempPByte, TempQByte, TempModulusByte, TempExponentByte, TempDByte As New Byte
Dim StringBuilder As New StringBuilder
Dim StringBuilder2 As New StringBuilder
Dim StringBuilder3 As New StringBuilder
Dim StringBuilder4 As New StringBuilder
Dim StringBuilder5 As New StringBuilder
Dim StringBuilder6 As New StringBuilder
Dim StringBuilder7 As New StringBuilder
Dim StringBuilder8 As New StringBuilder
For i As Integer = 0 To PString.Length - 1
PByte(i) = Byte.Parse(PString.ElementAt(i))
StringBuilder.Append(PByte(i).ToString)
Next
For i As Integer = 0 To QString.Length - 1
QByte(i) = Byte.Parse(QString.ElementAt(i))
StringBuilder2.Append(QByte(i).ToString)
Next
For i As Integer = 0 To ModulusString.Length - 1
ModulusByte(i) = Byte.Parse(ModulusString.ElementAt(i))
StringBuilder3.Append(ModulusByte(i).ToString)
Next
For i As Integer = 0 To ExponentString.Length - 1
ExponentByte(i) = Byte.Parse(ExponentString.ElementAt(i))
StringBuilder4.Append(ExponentByte(i).ToString)
Next
For i As Integer = 0 To DString.Length - 1
DByte(i) = Byte.Parse(DString.ElementAt(i))
StringBuilder5.Append(DByte(i).ToString)
Next
For i As Integer = 0 To DPString.Length - 1
DPByte(i) = Byte.Parse(DPString.ElementAt(i))
StringBuilder6.Append(DPByte(i).ToString)
Next
For i As Integer = 0 To DQString.Length - 1
DQByte(i) = Byte.Parse(DQString.ElementAt(i))
StringBuilder7.Append(DQByte(i).ToString)
Next
For i As Integer = 0 To InverseQString.Length - 1
InverseQByte(i) = Byte.Parse(InverseQString.ElementAt(i))
StringBuilder8.Append(InverseQByte(i).ToString)
Next
Dim MyRSAParams As New RSAParameters
MyRSAParams.P = PByte
MyRSAParams.Q = QByte
MyRSAParams.Exponent = ExponentByte
MyRSAParams.Modulus = ModulusByte
MyRSAParams.D = DByte
MyRSAParams.DP = DPByte
MyRSAParams.DQ = DQByte
MyRSAParams.InverseQ = InverseQByte
Dim MyRSA As RSA
MyRSA = RSA.Create()
MyRSA.ImportParameters(MyRSAParams)
End Sub
Private Sub RSA_Test_Form_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Dim temp, temp2 As Integer
temp = gcd(1, 2)
temp2 = gcd(2, 3)
FindFactor = 0
End Sub
End Class
What I am trying to do in the generate button was to create the suitable parameters for RSA.
The parameters I was actually able to generate them but in either ULong or Long data type.
When i first convert them into array of Bytes I have considered to use BitConverter but it doesn't work at least in my case.
The only way i am only able to make them into array of Bytes was by making the ULong or Long data type variable into string.
Then convert those string into Byte then put them into ByteArray I hope it was correct but it is out of my reach for now.
Any ideas on how can i make the parameter data to be accepted as rsa parameter?
