Xbase++

How to Parse a X.509 Certificate and Extract its Public Key

See more Certificates Examples

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)

Xbase++

LOCAL nSuccess
LOCAL oCert
LOCAL oPubKey

nSuccess := 0

oCert := 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.
nSuccess := oCert:LoadFromFile("qa_data/certs/testCert.cer")
IF (nSuccess == 0)
    ? oCert:LastErrorText
    oCert:destroy()
    RETURN
ENDIF

//  Get the public key:
oPubKey := CreateObject("Chilkat.PublicKey")
oCert:GetPublicKey(oPubKey)

//  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 = " + oPubKey:KeyType

oCert:destroy()
oPubKey:destroy()