Export Digital Certificate's Public Key

The ExportPublicKey method can be called to get a certificate's public key. It can then be saved to any of a number of formats: (1) OpenSSL DER, (2) OpenSSL PEM, (3) RSA DER, (4) XML.

Dim cert As New ChilkatCert

Dim success As Long

'  LoadFromFile will load virtually any certificate format file.
'  It will auto-recognize the format and load appropiately.
success = cert.LoadFromFile("/Users/chilkat/testData/cer/chilkat.cer")
If (success <> 1) Then
    Text1.Text = Text1.Text & cert.LastErrorText & vbCrLf
    Exit Sub
End If

'  Get the public key:
Dim pubkey As PublicKey

Set pubkey = cert.ExportPublicKey()
If (pubkey Is Nothing ) Then
    Text1.Text = Text1.Text & cert.LastErrorText & vbCrLf
    Exit Sub
End If

'  Save to various formats:
success = pubkey.SaveOpenSslDerFile("/Users/chilkat/testData/pubkeys/chilkat_openSsl.der")
If (success <> 1) Then
    Text1.Text = Text1.Text & pubkey.LastErrorText & vbCrLf

    Exit Sub
End If

success = pubkey.SaveOpenSslPemFile("/Users/chilkat/testData/pubkeys/chilkat_openSsl.pem")
If (success <> 1) Then
    Text1.Text = Text1.Text & pubkey.LastErrorText & vbCrLf

    Exit Sub
End If

success = pubkey.SaveRsaDerFile("/Users/chilkat/testData/pubkeys/chilkat_rsa.der")
If (success <> 1) Then
    Text1.Text = Text1.Text & pubkey.LastErrorText & vbCrLf

    Exit Sub
End If

success = pubkey.SaveXmlFile("/Users/chilkat/testData/pubkeys/chilkat.xml")
If (success <> 1) Then
    Text1.Text = Text1.Text & pubkey.LastErrorText & vbCrLf

    Exit Sub
End If

Text1.Text = Text1.Text & "Public key exported to all file formats." & vbCrLf