Add DescribeTLS()

pkg/cryptoutil/tls.go

@@ -0,0 +1,33 @@
+package cryptoutil
+
+import (
+	"crypto/tls"
+	"strings"
+)
+
+func DescribeTLS(version, cipherSuite uint16) string {
+	cs := tls.CipherSuiteName(cipherSuite)
+	cs = cs[:strings.LastIndexByte(cs, '_')]
+	cs = cipherSuiteReplacer.Replace(cs)
+
+	return TLSVersionName(version) + " and " + cs
+}
+
+func TLSVersionName(version uint16) string {
+	return tlsVersionNames[version]
+}
+
+var (
+	tlsVersionNames = map[uint16]string{
+		tls.VersionTLS10: "TLS 1.0",
+		tls.VersionTLS11: "TLS 1.1",
+		tls.VersionTLS12: "TLS 1.2",
+		tls.VersionTLS13: "TLS 1.3",
+	}
+
+	cipherSuiteReplacer = strings.NewReplacer(
+		"_WITH_", " with ",
+		"TLS_", "",
+		"_", "-",
+	)
+)