(Lianja) 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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loCert = createobject("CkCert")

// 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.
llSuccess = loCert.LoadFromFile("qa_data/certs/testCert.cer")
if (llSuccess = .F.) then
    ? loCert.LastErrorText
    release loCert
    return
endif

// Get the public key:
loPubKey = loCert.ExportPublicKey()
if (loCert.LastMethodSuccess <> .T.) then
    ? loCert.LastErrorText
    release loCert
    return
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