.build();
```

PEM files
---------

You can encode a `HeldCertificate` in PEM format:

```java
HeldCertificate heldCertificate = ...
System.out.println(heldCertificate.certificatePem())
```

```
-----BEGIN CERTIFICATE-----
MIIBSjCB8aADAgECAgEBMAoGCCqGSM49BAMCMC8xLTArBgNVBAMTJDJiYWY3NzVl
LWE4MzUtNDM5ZS1hYWE2LTgzNmNiNDlmMGM3MTAeFw0xODA3MTMxMjA0MzJaFw0x

    val heldCertificate: HeldCertificate = HeldCertificate.Builder().build()
    val certificate: X509Certificate = heldCertificate.certificate
    val keyPair: KeyPair = heldCertificate.keyPair
    val certificatePem: String = heldCertificate.certificatePem()
    val privateKeyPkcs8Pem: String = heldCertificate.privateKeyPkcs8Pem()
    val privateKeyPkcs1Pem: String = heldCertificate.privateKeyPkcs1Pem()
  }

  @Test