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tls.go
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tls.go
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package main
import (
"crypto/tls"
"io"
"log"
"strings"
)
func writeTLSSupportedCipherStrings(w io.Writer, min uint16) error {
for _, c := range CipherSuites() {
var found bool
for _, v := range c.SupportedVersions {
if v >= min {
found = true
}
}
if !found {
continue
}
_, err := w.Write([]byte(c.Name + "\n"))
if err != nil {
return err
}
}
return nil
}
// 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
}