Make hashing parameters configurable

authentication/credentials/password.go

@@ -0,0 +1,31 @@
+package credentials
+
+import (
+	"log"
+
+	"github.com/alexedwards/argon2id"
+)
+
+// CreatePasswordHash returns a hashed version of the given password.
+func (m *Manager) CreatePasswordHash(password string) []byte {
+	hash, err := argon2id.CreateHash(password, m.argon2Params)
+
+	if err != nil {
+		log.Fatal(err)
+		panic(err)
+	}
+
+	return []byte(hash)
+}
+
+// ComparePassword compares a hashed password with its possible plaintext equivalent.
+func ComparePassword(hash, password []byte) bool {
+	match, err := argon2id.ComparePasswordAndHash(string(password), string(hash))
+
+	if err != nil {
+		log.Fatal(err)
+		return false
+	}
+
+	return match
+}