From 459e9f880f7088fbe3534e10ebefaff6d733e2dc Mon Sep 17 00:00:00 2001
From: Kyle Isom <kyle@tyrfingr.is>
Date: Wed, 23 Apr 2014 16:54:16 -0700
Subject: [PATCH] Add function to build Google TOTPs from secret

---
 totp.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/totp.go b/totp.go
index 2727a41..3904920 100644
--- a/totp.go
+++ b/totp.go
@@ -99,6 +99,14 @@ func GenerateGoogleTOTP() *TOTP {
 	return NewTOTP(key, 0, 30, 6, crypto.SHA1)
 }
 
+func NewGoogleTOTP(secret string) (*TOTP, error) {
+	key, err := base32.StdEncoding.DecodeString(secret)
+	if err != nil {
+		return nil, err
+	}
+	return NewTOTP(key, 0, 30, 6, crypto.SHA1), nil
+}
+
 func totpFromURL(u *url.URL) (*TOTP, string, error) {
 	label := u.Path[1:]
 	v := u.Query()