Apply go modernize

pkg/crypto/ciphersuite/ciphersuite.go

@@ -82,11 +82,9 @@ func examinePadding(payload []byte) (toRemove int, good byte) {
 	good = byte(int32(^t) >> 31) //nolint:gosec //G115
 
 	// The maximum possible padding length plus the actual length field
-	toCheck := 256
-	// The length of the padded data is public, so we can use an if here
-	if toCheck > len(payload) {
-		toCheck = len(payload)
-	}
+	toCheck := min(
+		// The length of the padded data is public, so we can use an if here
+		256, len(payload))
 
 	for i := 0; i < toCheck; i++ {
 		t := uint(paddingLen) - uint(i) //nolint:gosec //G115

pkg/crypto/fingerprint/fingerprint.go

@@ -28,7 +28,7 @@ func Fingerprint(cert *x509.Certificate, algo crypto.Hash) (string, error) {
 		// https://golang.org/pkg/hash/#Hash
 		i += n
 	}
-	digest := []byte(fmt.Sprintf("%x", h.Sum(nil)))
+	digest := fmt.Appendf(nil, "%x", h.Sum(nil))
 
 	digestlen := len(digest)
 	if digestlen == 0 {

pkg/protocol/extension/alpn.go

@@ -4,6 +4,8 @@
 package extension
 
 import (
+	"slices"
+
 	"golang.org/x/crypto/cryptobyte"
 )
 
@@ -72,10 +74,8 @@ func ALPNProtocolSelection(supportedProtocols, peerSupportedProtocols []string)
 		return "", nil
 	}
 	for _, s := range supportedProtocols {
-		for _, c := range peerSupportedProtocols {
-			if s == c {
-				return s, nil
-			}
+		if slices.Contains(peerSupportedProtocols, s) {
+			return s, nil
 		}
 	}
 

util.go

@@ -3,12 +3,12 @@
 
 package dtls
 
+import "slices"
+
 func findMatchingSRTPProfile(a, b []SRTPProtectionProfile) (SRTPProtectionProfile, bool) {
 	for _, aProfile := range a {
-		for _, bProfile := range b {
-			if aProfile == bProfile {
-				return aProfile, true
-			}
+		if slices.Contains(b, aProfile) {
+			return aProfile, true
 		}
 	}
 
@@ -31,10 +31,7 @@ func splitBytes(bytes []byte, splitLen int) [][]byte {
 	splitBytes := make([][]byte, 0)
 	numBytes := len(bytes)
 	for i := 0; i < numBytes; i += splitLen {
-		j := i + splitLen
-		if j > numBytes {
-			j = numBytes
-		}
+		j := min(i+splitLen, numBytes)
 
 		splitBytes = append(splitBytes, bytes[i:j])
 	}