(minor) convert UDP private key to bytea

frontend/udp/connection_id.go

@@ -61,11 +61,11 @@ type ConnectionIDGenerator struct {
 }
 
 // NewConnectionIDGenerator creates a new connection ID generator.
-func NewConnectionIDGenerator(key string, maxClockSkew time.Duration) *ConnectionIDGenerator {
+func NewConnectionIDGenerator(key []byte, maxClockSkew time.Duration) *ConnectionIDGenerator {
 	return &ConnectionIDGenerator{
 		mac: hmac.New(func() hash.Hash {
 			return xxhash.New()
-		}, []byte(key)),
+		}, key),
 		connID:       make([]byte, connIDLen),
 		buff:         make([]byte, buffLen),
 		scratch:      make([]byte, scratchLen),

frontend/udp/frontend.go

@@ -27,6 +27,7 @@ import (
 const (
 	// Name - registered name of the frontend
 	Name                = "udp"
+	defaultKeyLen       = 32
 	maxAllowedClockSkew = 30 * time.Second
 	defaultMaxClockSkew = 10 * time.Second
 )
@@ -57,7 +58,7 @@ func (cfg Config) Validate() (validCfg Config) {
 
 	// Generate a private key if one isn't provided by the user.
 	if cfg.PrivateKey == "" {
-		pkeyRunes := make([]rune, 64)
+		pkeyRunes := make([]rune, defaultKeyLen)
 		for i := range pkeyRunes {
 			pkeyRunes[i] = allowedGeneratedPrivateKeyRunes[rand.Intn(len(allowedGeneratedPrivateKeyRunes))]
 		}
@@ -70,6 +71,7 @@ func (cfg Config) Validate() (validCfg Config) {
 			Msg("falling back to default configuration")
 	}
 
+	// ABS
 	sb := cfg.MaxClockSkew >> 63
 	validCfg.MaxClockSkew = (cfg.MaxClockSkew ^ sb) + (sb & 1)
 
@@ -108,6 +110,7 @@ func NewFrontend(c conf.MapConfig, logic *middleware.Logic) (frontend.Frontend,
 		return nil, err
 	}
 	cfg = cfg.Validate()
+	pKey := []byte(cfg.PrivateKey)
 
 	f := &udpFE{
 		sockets:        make([]*net.UDPConn, cfg.Workers),
@@ -117,7 +120,7 @@ func NewFrontend(c conf.MapConfig, logic *middleware.Logic) (frontend.Frontend,
 		ParseOptions:   cfg.ParseOptions,
 		genPool: &sync.Pool{
 			New: func() any {
-				return NewConnectionIDGenerator(cfg.PrivateKey, cfg.MaxClockSkew)
+				return NewConnectionIDGenerator(pKey, cfg.MaxClockSkew)
 			},
 		},
 	}