Question

I’m obviously missing something fundamental here. I have the following Scala Code:

package org.carlskii

import java.io._
import java.security.cert.CertificateFactory
import java.security.Security
import org.bouncycastle.jce.provider._

object Main extends App {

  Security.addProvider(new BouncyCastleProvider)
  val provider = new BouncyCastleProvider
  val in = new FileInputStream("cert.cer")
  val certificateFactory = CertificateFactory.getInstance("X509", provider)
  val certificate = certificateFactory.generateCertificate(file)
  println(certificate.getClass)

} 

Which produces this:

class org.bouncycastle.jce.provider.X509CertificateObject

So I have a Bouncy Castle X509CertificateObject object. If I call the certificate.getPublicKey method it correctly returns the public key for the certificate.

However if I call certificate.getSerialNumber it throws the following error:

error: value getSerialNumber is not a member of java.security.cert.Certificate
println(certificate.getSerialNumber)

The interesting thing here is that Scala thinks it’s a java.security.cert.Certificate and not an org.bouncycastle.jce.provider.X509CertificateObject object. Why is this the case?

Answer 1

The generateCertificate method returns a Certificate object, if you are sure you’re going to get a org.bouncycastle.jce.provider.X509CertificateObject just cast the result to it:

package org.carlskii

import java.io._
import java.security.cert.CertificateFactory
import java.security.Security
import org.bouncycastle.jce.provider._

object Main extends App {

  Security.addProvider(new BouncyCastleProvider)
  val provider = new BouncyCastleProvider
  val in = new FileInputStream("cert.cer")
  val certificateFactory = CertificateFactory.getInstance("X509", provider)
  val certificate = certificateFactory.generateCertificate(file).asInstanceOf[X509CertificateObject]
  println(certificate.getClass)

}