Export a Certificate's Private Key to Various Formats

Loads a digital certificate and private key from a PFX file (also known as PKCS#12) and exports the private key to various formats: (1) PKCS8 Encrypted, (2) PKCS8 Encrypted PEM, (3) PKCS8 unencrypted, (4) PKCS8 PEM unencrypted, (5) RSA DER unencrypted, (6) RSA PEM unencrypted, (7) XML.

Download: Chilkat .NET Assemblies

Dim cert As New Chilkat.Cert()

Dim success As Boolean

'  Load from the PFX file
Dim pfxFilename As String
pfxFilename = "/Users/chilkat/testData/pfx/chilkat_ssl_pwd_is_test.pfx"
Dim pfxPassword As String
pfxPassword = "test"

'  A PFX typically contains certificates in the chain of authentication.
'  The Chilkat cert object will choose the certificate w/
'  private key farthest from the root authority cert.
'  To access all the certificates in a PFX, use the
'  Chilkat certificate store object instead.
success = cert.LoadPfxFile(pfxFilename,pfxPassword)
If (success <> true) Then
    TextBox1.Text = TextBox1.Text & cert.LastErrorText & vbCrLf
    Exit Sub
End If


'  Get the private key...
Dim privKey As Chilkat.PrivateKey
privKey = cert.ExportPrivateKey()
If (privKey Is Nothing ) Then
    TextBox1.Text = TextBox1.Text & cert.LastErrorText & vbCrLf
    Exit Sub
End If


'  Export to various formats:

Dim password As String
password = "secret"
Dim path As String

'  PKCS8 Encrypted DER
path = "/Users/chilkat/testData/privkeys/chilkat_pkcs8_enc.der"
success = privKey.SavePkcs8EncryptedFile(password,path)
If (success <> true) Then
    TextBox1.Text = TextBox1.Text & privKey.LastErrorText & vbCrLf

    Exit Sub
End If


'  PKCS8 Encrypted PEM
path = "/Users/chilkat/testData/privkeys/chilkat_pkcs8_enc.pem"
success = privKey.SavePkcs8EncryptedPemFile(password,path)
If (success <> true) Then
    TextBox1.Text = TextBox1.Text & privKey.LastErrorText & vbCrLf

    Exit Sub
End If


'  PKCS8 Unencrypted DER
path = "/Users/chilkat/testData/privkeys/chilkat_pkcs8.der"
success = privKey.SavePkcs8File(path)
If (success <> true) Then
    TextBox1.Text = TextBox1.Text & privKey.LastErrorText & vbCrLf

    Exit Sub
End If


'  PKCS8 Unencrypted PEM
path = "/Users/chilkat/testData/privkeys/chilkat_pkcs8.pem"
success = privKey.SavePkcs8PemFile(path)
If (success <> true) Then
    TextBox1.Text = TextBox1.Text & privKey.LastErrorText & vbCrLf

    Exit Sub
End If


'   RSA DER (unencrypted)
path = "/Users/chilkat/testData/privkeys/chilkat_rsa.der"
success = privKey.SaveRsaDerFile(path)
If (success <> true) Then
    TextBox1.Text = TextBox1.Text & privKey.LastErrorText & vbCrLf

    Exit Sub
End If


'  RSA PEM (unencrypted)
path = "/Users/chilkat/testData/privkeys/chilkat_rsa.pem"
success = privKey.SaveRsaPemFile(path)
If (success <> true) Then
    TextBox1.Text = TextBox1.Text & privKey.LastErrorText & vbCrLf

    Exit Sub
End If


'  XML (unencrypted)
path = "/Users/chilkat/testData/privkeys/chilkat.xml"
success = privKey.SaveXmlFile(path)
If (success <> true) Then
    TextBox1.Text = TextBox1.Text & privKey.LastErrorText & vbCrLf

    Exit Sub
End If




TextBox1.Text = TextBox1.Text & "Private key exported to all formats." & vbCrLf