(Xojo Plugin) How to Parse a X.509 Certificate and Extract its Public Key

Demonstrates how to load an X.509 certificate and extract the public key. Chilkat supports many certificate encodings:

• DER (binary) encoded certificates (.crt/.cer)
• PEM (BASE64) encoded certificates (.pem)
• Load Certificates Directly from Windows Certificate Stores
• PFX/PKCS12 (.pfx/.p12)
• Java KeyStore (.jks)
• Cryptographic Message Syntax Standard - PKCS #7 Certificates (.P7B)

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Dim cert As New Chilkat.Cert

// Load a DER (binary) encoded certificate.
// To load from a .pem or .p7b, or any other file format that contains
// just one certificate, call LoadFromFile in exactly the same way.
// The LoadFromFile method automatically detects the format and loads the certificate.
Dim success As Boolean
success = cert.LoadFromFile("qa_data/certs/testCert.cer")
If (success = False) Then
    System.DebugLog(cert.LastErrorText)
    Return
End If

// Get the public key:
Dim pubKey As Chilkat.PublicKey
pubKey = cert.ExportPublicKey()
If (cert.LastMethodSuccess <> True) Then
    System.DebugLog(cert.LastErrorText)
    Return
End If

// Examine the key type.
// A PublicKey object can contain an RSA, ECC, or DSA public key.
// The KeyType property will contain "rsa", "ecc", or "dsa".
System.DebugLog("key type = " + pubKey.KeyType)