Export Public Key to RSA DER, OpenSSL DER/PEM, XML

Demonstrates how to export a digital certificate's public key to RSA DER, OpenSSL PEM or DER, or to XML format.

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Dim cert As New Chilkat.Cert()

'  Th LoadByCommonName method searches the Windows
'  Current User Certificate Store and Local Machine Certificate
'  Store for a certificate whose common name (CN) matches
'  the argument:
Dim success As Boolean
success = cert.LoadByCommonName("Chilkat Software, Inc.")
If (success = false) Then
    MsgBox("Failed to find certificate!")
Else

    '  Get the PublicKey object:
    Dim pkey As Chilkat.PublicKey

    pkey = cert.ExportPublicKey()
    If (Not (pkey Is Nothing )) Then

        '  Export the public key to an RSA DER file:
        pkey.SaveRsaDerFile("pubkey_rsa.der")

        '  Export to an OpenSSL DER file:
        pkey.SaveOpenSslDerFile("pubkey_openssl.der")

        '  Export to an OpenSSL PEM file:
        pkey.SaveOpenSslPemFile("pubkey_openssl.pem")

        '  Export to an XML file:
        pkey.SaveXmlFile("pubkey.xml")

        '  Get OpenSSL PEM string:
        TextBox1.Text = TextBox1.Text & "OpenSSL PEM Public Key:" & vbCrLf
        TextBox1.Refresh()
        TextBox1.Text = TextBox1.Text & pkey.GetOpenSslPem() & vbCrLf
        TextBox1.Refresh()


    Else
        MsgBox("No public key found!")
    End If


End If


'  The Chilkat Certificate, Certificate Store, Private Key,
'  Public Key, and Key Container classes / objects are freeware.

'  They are used by and included with the Chilkat Email,
'  Crypt, S/MIME, and other commercial Chilkat components.