B4X Requires Chilkat v11.0.0+

RSA Encrypt with Modulus and Exponent

See more RSA Examples

Demonstrates how to RSA encrypt with a given modulus and exponent. B4X

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 ChilkatRsa
rsa.Initialize

'  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 ChilkatXml
xml.Initialize
xml.Tag = "RSAPublicKey"
xml.NewChild2("Modulus", modulus)
xml.NewChild2("Exponent", exponent)

Dim pubKey As ChilkatPublicKey
pubKey.Initialize
success = pubKey.LoadFromString(xml)
If success = False Then
    Log(pubKey.LastErrorText)
    Return
End If


success = rsa.UsePublicKey(pubKey)
If success = False Then
    Log(rsa.LastErrorText)
    Return
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)
Log(encryptedStrBase64)