Update go docs.

authenticator/authenticator.go

@@ -9,6 +9,7 @@ import (
 )
 
 const (
+	// QRSize indicates the size of the generated image containing the QR code.
 	QRSize = 256
 )
 

config/algorithm.go

@@ -7,6 +7,7 @@ import (
 	"hash"
 )
 
+// HmacAlgorithm type describes the supported hash algorithms for usage in OTP generation.
 type HmacAlgorithm int
 
 const (

config/length.go

@@ -6,6 +6,7 @@ import (
 	"strconv"
 )
 
+// Length type describes the recommended OTP lengths.
 type Length int
 
 // Supported length to the OTP generated using HOTP or TOTP.
@@ -20,15 +21,18 @@ const (
 	Length8
 )
 
+// Truncate will cut the provided number to fit the Length.
 func (l Length) Truncate(number int) int {
 	return number % int(math.Pow10(int(l)))
 }
 
+// LeftPad adds extra zeroes to the left of the number to complete the Length.
 func (l Length) LeftPad(number int) string {
 	format := "%0" + strconv.Itoa(int(l)) + "d"
 	return fmt.Sprintf(format, number)
 }
 
+// String converts the Length into a string.
 func (l Length) String() string {
 	return strconv.Itoa(int(l))
 }

hotp.go

@@ -97,6 +97,7 @@ func (h *HOTP) KeyUri(accountName, issuer string) *authenticator.KeyUri {
 	}
 }
 
+// AsUrlValues returns the HOTP parameters represented as url.Values.
 func (h *HOTP) AsUrlValues(issuer string) url.Values {
 	params := url.Values{}
 	params.Add("secret", h.Key)

totp.go

@@ -102,6 +102,7 @@ func (t *TOTP) KeyUri(accountName, issuer string) *authenticator.KeyUri {
 	}
 }
 
+// AsUrlValues returns the TOTP parameters represented as url.Values.
 func (t *TOTP) AsUrlValues(issuer string) url.Values {
 	params := url.Values{}
 	params.Add("secret", t.Key)