VB.NET

Convert RSA Private Key to Public Key

See more RSA Examples

Demonstrates how to get a public RSA key from a private RSA key. VB.NET

Dim success As Boolean = False

Dim privKey As New Chilkat.PrivateKey

' Step 1: Load the private key from a source.
' (Chilkat can load private keys from all types of formats, and from in-memory bytes or encoded strings.
' see the online reference documentation for more options.)
success = privKey.LoadPemFile("qa_data/pem/VP_Private.pem")
If (success = False) Then
    Debug.WriteLine(privKey.LastErrorText)
    Exit Sub
End If


' Step 2: Get the public key object from the private key object.
Dim pubKey As New Chilkat.PublicKey
privKey.ToPublicKey(pubKey)

' Step 3: Save the public key in a desired format. 
' (Chilkat can load or save public and private keys in many different formats.  See
' the online reference documentation for more options.)

' Saves to a PKCS8 PEM file.
Dim bPreferPkcs1 As Boolean = False
success = pubKey.SavePemFile(bPreferPkcs1,"qa_data/pem/VP_Public.pem")
If (pubKey.LastMethodSuccess = False) Then
    Debug.WriteLine(pubKey.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Extracted and saved public key from private key.")