Imports github.com/xenolf/lego/certcrypto github.com/mholt/certmagic github.com/klauspost/cpuid github.com/xenolf/lego/challenge/tlsalpn01 github.com/mholt/caddy github.com/mholt/caddy/telemetry github.com/xenolf/lego/challenge Standard library imports crypto/elliptic crypto/rsa encoding/pem crypto/ecdsa math/big bytes crypto/rand crypto/tls crypto/x509 crypto/x509/pkix fmt io io/ioutil log net net/url os path/filepath strconv strings sync sync/atomic time