VB.NET

RSA Encrypt with Modulus and Exponent

See more RSA Examples

Demonstrates how to RSA encrypt with a given modulus and exponent. VB.NET

Dim success As Boolean = False

' This example assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim rsa As New Chilkat.Rsa

' Assuming you already have a base64 modulus and exponent,
' wrap it in XML like this:
Dim modulus As String = "qMBRpdYrAy5aMmo31NErUizh5sbweguSmh4wlK6uJEIDl+kwTlROnE34KOFExeTbJSX0WygPi+vWl0yNq7buIMUKpytossAAWut5khO3CQJxTk7G2gnEPNUUXHiExGgNrLzcSLv8YIlfVALhoRWyC67KOL+a+3taNq3h+BHeWhM="
Dim exponent As String = "AQAB"

Dim xml As New Chilkat.Xml
xml.Tag = "RSAPublicKey"
xml.NewChild2("Modulus",modulus)
xml.NewChild2("Exponent",exponent)

Dim pubKey As New Chilkat.PublicKey
success = pubKey.LoadFromString(xml)
If (success = False) Then
    Debug.WriteLine(pubKey.LastErrorText)
    Exit Sub
End If


success = rsa.UsePublicKey(pubKey)
If (success = False) Then
    Debug.WriteLine(rsa.LastErrorText)
    Exit Sub
End If


Dim usePrivateKey As Boolean = False
Dim plainText As String = "message in a bottle"

rsa.EncodingMode = "base64"
Dim encryptedStrBase64 As String = rsa.EncryptStringENC(plainText,usePrivateKey)
Debug.WriteLine(encryptedStrBase64)