Fix linter errors, update required Go version

.github/workflows/test.yaml

@@ -9,8 +9,8 @@ jobs:
     strategy:
       matrix:
         version:
-          - '1.19-alpine'
-          - '1.20-alpine'
+          - '1.22-alpine'
+          - '1.23-alpine'
           - alpine
 
     defaults:

.travis.yml

@@ -1,11 +0,0 @@
-language: go
-
-go:
-  - 1.12.x
-  - 1.13.x
-  - 1.14.x
-  - tip
-
-script:
-  - go vet
-  - go test -v -cover -timeout 1800s

dh.go

@@ -1,3 +1,5 @@
+// Package dhparam is a pure Golang implementation of the openssl
+// dhparam generator no requiring any CGO bindings
 package dhparam
 
 import (
@@ -23,7 +25,7 @@ type DH struct {
 
 // Decode reads a DH parameters struct from its PEM data
 func Decode(pemData []byte) (*DH, error) {
-	if pemData == nil || len(pemData) == 0 {
+	if len(pemData) == 0 {
 		return nil, ErrNoPem
 	}
 

generator.go

@@ -59,9 +59,9 @@ func GenerateWithContext(ctx context.Context, bits int, generator Generator, cb
 	}
 
 	switch generator {
-	case 2:
+	case 2: //nolint:mnd
 		padd, rem = 24, 11
-	case 5:
+	case 5: //nolint:mnd
 		padd, rem = 10, 3
 	default:
 		padd, rem = 2, 1
@@ -70,7 +70,7 @@ func GenerateWithContext(ctx context.Context, bits int, generator Generator, cb
 	for {
 		select {
 		case <-ctx.Done():
-			return nil, ctx.Err()
+			return nil, ctx.Err() //nolint:wrapcheck // Fine in this case
 		default:
 			if prime, err = genPrime(bits, big.NewInt(padd), big.NewInt(rem)); err != nil {
 				return nil, err
@@ -107,7 +107,7 @@ func genPrime(bits int, padd, rem *big.Int) (*big.Int, error) {
 		err  error
 		p    = new(big.Int)
 		qadd = new(big.Int)
-		q    = new(big.Int)
+		q    *big.Int
 		t1   = new(big.Int)
 	)
 
@@ -146,10 +146,11 @@ func mightBePrime(i *big.Int) bool {
 	return true
 }
 
+//nolint:mnd
 func genRand(bits int) (*big.Int, error) {
 	bytes := (bits + 7) / 8
 	bit := (bits - 1) % 8
-	mask := 0xff << uint(bit+1)
+	mask := 0xff << uint(bit+1) //#nosec:G115 // Should only ever run with positive ints
 
 	buf := make([]byte, bytes)
 	if _, err := rand.Read(buf); err != nil {
@@ -160,7 +161,7 @@ func genRand(bits int) (*big.Int, error) {
 		buf[0] = 1
 		buf[1] |= 0x80
 	} else {
-		buf[0] |= 3 << uint(bit-1)
+		buf[0] |= 3 << uint(bit-1) //#nosec:G115 // Should only ever run with positive ints
 	}
 
 	buf[0] &= byte(^mask)

generator_test.go

@@ -11,6 +11,7 @@ import (
 	"time"
 )
 
+//nolint:errcheck,gosec,revive
 func opensslOutput(r GeneratorResult) {
 	switch r {
 	case GeneratorFoundPossiblePrime:
@@ -39,15 +40,15 @@ func execGeneratorIntegration(t *testing.T, bitsize int, generator Generator) {
 	if err != nil {
 		t.Fatalf("Unable to create tempfile: %s", err)
 	}
-	defer os.Remove(f.Name())
+	defer os.Remove(f.Name()) //nolint:errcheck
 
 	if _, err = f.Write(pem); err != nil {
 		t.Fatalf("Unable to write tempfile: %s", err)
 	}
 
-	f.Close()
+	f.Close() //nolint:errcheck,gosec,revive
 
-	cmd := exec.Command("openssl", "dhparam", "-inform", "PEM", "-in", f.Name(), "-check", "-noout", "-text")
+	cmd := exec.Command("openssl", "dhparam", "-inform", "PEM", "-in", f.Name(), "-check", "-noout", "-text") //#nosec:G204 // Only for tests
 	cmd.Stdin = bytes.NewReader(pem)
 	cmd.Stdout = buf
 	cmd.Stderr = buf

go.mod

@@ -1,3 +1,3 @@
 module github.com/Luzifer/go-dhparam
 
-go 1.19
+go 1.22

validate.go

@@ -1,18 +1,19 @@
 package dhparam
 
 import (
-	"math/big"
-
 	"errors"
+	"math/big"
 )
 
-const dhCheckPNotPrime = 0x01
-const dhCheckPNotSafePrime = 0x02
-const dhUnableToCheckGenerator = 0x04
-const dhNotSuitableGenerator = 0x08
-const dhCheckQNotPrime = 0x10
-const dhCheckInvalidQValue = 0x20
-const dhCheckInvalidJValue = 0x40
+const (
+	dhCheckPNotPrime         = 0x01
+	dhCheckPNotSafePrime     = 0x02
+	dhUnableToCheckGenerator = 0x04
+	dhNotSuitableGenerator   = 0x08
+	dhCheckQNotPrime         = 0x10
+	dhCheckInvalidQValue     = 0x20
+	dhCheckInvalidJValue     = 0x40
+)
 
 // ErrAllParametersOK is defined to check whether the returned error from Check is indeed no error
 // For simplicity reasons it is defined as an error instead of an additional result parameter
@@ -71,19 +72,20 @@ func (d DH) Check() ([]error, bool) {
 	return result, ok
 }
 
+//revive:disable-next-line:confusing-naming // Intended in this case as this is the real functionality
 func (d DH) check() int {
 	var ret int
 
 	// Check generator
 	switch d.G {
-	case 2:
+	case 2: //nolint:mnd
 		l := new(big.Int)
-		if l.Mod(d.P, big.NewInt(24)); l.Int64() != 11 {
+		if l.Mod(d.P, big.NewInt(24)); l.Int64() != 11 { //nolint:mnd
 			ret |= dhNotSuitableGenerator
 		}
-	case 5:
+	case 5: //nolint:mnd
 		l := new(big.Int)
-		if l.Mod(d.P, big.NewInt(10)); l.Int64() != 3 && l.Int64() != 7 {
+		if l.Mod(d.P, big.NewInt(10)); l.Int64() != 3 && l.Int64() != 7 { //nolint:mnd
 			ret |= dhNotSuitableGenerator
 		}
 	default: