(Xojo Plugin) Convert RSA Private Key to Public Key

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

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Dim key 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.)
Dim success As Boolean
success = key.LoadPemFile("qa_data/pem/VP_Private.pem")
If (success <> True) Then
    System.DebugLog(key.LastErrorText)
    Return
End If

// Step 2: Get the public key object from the private key object.
Dim pubKey As Chilkat.PublicKey
pubKey = key.GetPublicKey()
If (key.LastMethodSuccess <> True) Then
    System.DebugLog(key.LastErrorText)
    Return
End If

// 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
bPreferPkcs1 = False
success = pubKey.SavePemFile(bPreferPkcs1,"qa_data/pem/VP_Public.pem")
If (pubKey.LastMethodSuccess <> True) Then
    System.DebugLog(pubKey.LastErrorText)
    Return
End If

System.DebugLog("Extracted and saved public key from private key.")