Add missing files

tls.go

@@ -0,0 +1,61 @@
+package main
+
+import (
+	"crypto/tls"
+	"log"
+	"strings"
+)
+
+// getTLSMinVersion converts a version string into a TLS version ID.
+func getTLSMinVersion(v string) uint16 {
+	switch v {
+	case "1.0":
+		return tls.VersionTLS10
+	case "1.1":
+		return tls.VersionTLS11
+	case "1.2", "":
+		return tls.VersionTLS12
+	case "1.3":
+		return tls.VersionTLS13
+	default:
+		log.Fatalln("error: unknown minimum TLS version:", v)
+		return 0
+	}
+}
+
+// getTLSCipherSuites converts a comma separated list of cipher suites into a
+// slice of TLS cipher suite IDs.
+func getTLSCipherSuites(v string) []uint16 {
+	supported := CipherSuites()
+
+	if v == "" {
+		suites := make([]uint16, len(supported))
+
+		for _, cs := range supported {
+			suites = append(suites, cs.ID)
+		}
+
+		return suites
+	}
+
+	var found bool
+	txts := strings.Split(v, ",")
+	suites := make([]uint16, len(txts))
+
+	for _, want := range txts {
+		found = false
+
+		for _, cs := range supported {
+			if want == cs.Name {
+				suites = append(suites, cs.ID)
+				found = true
+			}
+		}
+
+		if !found {
+			log.Fatalln("error: unknown TLS cipher suite:", want)
+		}
+	}
+
+	return suites
+}