(Visual FoxPro) 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)

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loCert
LOCAL lnSuccess
LOCAL loPubKey

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Cert')
loCert = CreateObject('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.
lnSuccess = loCert.LoadFromFile("qa_data/certs/testCert.cer")
IF (lnSuccess = 0) THEN
    ? loCert.LastErrorText
    RELEASE loCert
    CANCEL
ENDIF

* Get the public key:
loPubKey = loCert.ExportPublicKey()
IF (loCert.LastMethodSuccess <> 1) THEN
    ? loCert.LastErrorText
    RELEASE loCert
    CANCEL
ENDIF

* 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".
? "key type = " + loPubKey.KeyType

RELEASE loPubKey

RELEASE loCert