Imports of package tlsutil

PathSynopsis
crypto/tlsPackage tls partially implements TLS 1.2, as specified in RFC 5246, and TLS 1.3, as specified in RFC 8446.
crypto/x509Package x509 implements a subset of the X.509 standard.
encoding/pemPackage pem implements the PEM data encoding, which originated in Privacy Enhanced Mail.
io/ioutilPackage ioutil implements some I/O utility functions.