1 files changed, 46 insertions, 0 deletions
diff --git a/gotp.go b/gotp.go
new file mode 100644
index 0000000..76676a2
--- /dev/null
+++ b/gotp.go
@@ -0,0 +1,46 @@
+// Copyright 2021, Shulhan <ms@kilabit.info>. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package gotp
+
+import (
+	"strings"
+	"unicode"
+)
+
+// List of available algorithm for Provider.
+const (
+	HashSHA1   = "SHA1" // Default algorithm.
+	HashSHA256 = "SHA256"
+	HashSHA512 = "SHA512"
+)
+
+const (
+	configDir   = "gotp"
+	configFile  = "gotp.conf"
+	defaultHash = HashSHA1
+
+	// List of known providers
+	providerNameAegis = "aegis"
+)
+
+//
+// normalizeLabel convert non alpha number, hyphen, underscore, or period
+// characters into "-".
+//
+func normalizeLabel(in string) (out string) {
+	var (
+		buf         strings.Builder
+		replacement rune = '-'
+	)
+	for _, r := range in {
+		if unicode.IsLetter(r) || unicode.IsDigit(r) ||
+			r == '-' || r == '_' || r == '.' {
+			buf.WriteRune(r)
+		} else {
+			buf.WriteRune(replacement)
+		}
+	}
+	return strings.ToLower(buf.String())
+}