https://libp2p.github.io/js-libp2p/interfaces/_libp2p_interface.RSAPrivateKey.html
RSAPrivateKey | libp2p
Documentation for libp2p
https://docs.oracle.com/javase/jp/11/docs/api/java.base/java/security/interfaces/RSAPrivateKey.html
RSAPrivateKey (Java SE 11 & JDK 11 )
java sejdk
https://www.ibm.com/support/pages/apar/IV93691
IV93691: JSSE THROWS KEY IS NOT AN RSAPRIVATEKEY WHILE USING FIPS & CAC
Error Message: The customer is using FIPS and CAC and he gets a "javax.net.ssl.SSLHandshakeException: Error signing certificate