Gio.TlsCertificate.private_key_pem
TlsCertificate.private_key_pem: String (Write / Construct Only)
The PEM (ASCII) encoded representation of the certificate's private key in either PKCS#1 format ("`BEGIN RSA PRIVATE KEY`") or unencrypted PKCS#8 format ("`BEGIN PRIVATE KEY`"). This property (or the Gio.TlsCertificate.private_key property) can be set when constructing a key (eg, from a file), but cannot be read.
PKCS#8 format is supported since 2.32; earlier releases only support PKCS#1. You can use the `openssl rsa` tool to convert PKCS#8 keys to PKCS#1.
Since 2.28