Initial import.

Basic HOTP functionality.

otp_test.go

@@ -0,0 +1,13 @@
+package twofactor
+
+import "fmt"
+import "testing"
+
+func TestHOTPString(t *testing.T) {
+	hotp := NewHOTP(nil, 0, 6)
+	hotpString := OTPString(hotp)
+	if hotpString != "OATH-HOTP, 6" {
+		fmt.Println("twofactor: invalid OTP string")
+		t.FailNow()
+	}
+}