The back-end policies supported in this build are:
  * GnuTLS TLS library (scope: GnuTLS, SSL, TLS)
  * OpenSSL TLS library (scope: OpenSSL, SSL, TLS)
  * NSS TLS library (scope: NSS, SSL, TLS)
  * OpenJDK runtime environment (scope: java-tls, SSL, TLS)
  * Kerberos 5 library Libkrb5 (scope: krb5, kerberos)
  * BIND DNS name server daemon (scope: BIND, DNSSec)
  * OpenSSH SSH2 protocol implementation (scope: OpenSSH, SSH)
  * libssh SSH2 protocol implementation (scope: libssh, SSH)

The back-end policies not supported in this build are:
  * Libreswan (scope: libreswan, IKE, IPSec)
  * Sequoia PGP implementation (scope: sequoia)
  * rpm-sequoia RPM Sequoia PGP (scope: rpm, rpm-sequoia)

Please, refer to 'man 8 update-crypto-policies' for more info.