added config options and nonce

hash.go

@@ -1,4 +1,4 @@
-// Copyright (C) 2018 Marius Schellenberger
+// Copyright (C) 2025 Marius Schellenberger
 
 package jwt
 
@@ -14,19 +14,25 @@ const (
 	HS512Name = "HS512"
 )
 
-// ParseHash returns the Hash type equal to the input string
-func ParseHash(alg string) Hash {
+// NewHash returns the Hash type equal to the input string
+func NewHash(alg string) Hash {
 	switch alg {
 	case HS256Name:
-		return NewHS256()
+		return hs256
 	case HS384Name:
-		return NewHS384()
+		return hs384
 	case HS512Name:
-		return NewHS512()
+		return hs512
 	}
 	return nil
 }
 
+var (
+	hs256 = HS256{}
+	hs384 = HS384{}
+	hs512 = HS512{}
+)
+
 // Hash is the hashsum interface for signing the jwt
 type Hash interface {
 	Hash() hash.Hash
@@ -36,11 +42,6 @@ type Hash interface {
 // HS256 implements the Hash interface with SHA256
 type HS256 struct{}
 
-// NewHS256 returns a new HS256 instance
-func NewHS256() Hash {
-	return HS256{}
-}
-
 // Alg returns the algorithm name "HS256"
 func (HS256) Alg() string {
 	return HS256Name
@@ -54,11 +55,6 @@ func (HS256) Hash() hash.Hash {
 // HS384 implements the Hash interface with SHA384
 type HS384 struct{}
 
-// NewHS384 returns a new HS384 instance
-func NewHS384() Hash {
-	return HS384{}
-}
-
 // Alg returns the algorithm name "HS384"
 func (HS384) Alg() string {
 	return HS384Name
@@ -72,11 +68,6 @@ func (HS384) Hash() hash.Hash {
 // HS512 implements the Hash interface with SHA512
 type HS512 struct{}
 
-// NewHS512 returns a new HS512 instance
-func NewHS512() Hash {
-	return HS512{}
-}
-
 // Alg returns the algorithm name "HS512"
 func (HS512) Alg() string {
 	return HS512Name