Time-based one-time password algorithm: Difference between revisions
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→{{header|Go}}: Add Go |
→{{header|Go}}: Add example of use |
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Line 199:
p[0] &= 0x7f
return p
}</lang>
{{out|Example use}}
(in a format that gets put into the [https://godoc.org/github.com/dchapes/onetime generated documentation])
<lang go>package onetime
import (
"crypto/sha256"
"fmt"
"time"
"github.com/gwwfps/onetime"
)
func Example_simple() {
// Simple 6-digit HOTP code:
var secret = []byte("SOME_SECRET")
var counter uint64 = 123456
var otp, _ = onetime.Simple(6)
var code = otp.HOTP(secret, counter)
fmt.Println(code)
// Output:
// 260040
}
func Example_authenticator() {
// Google authenticator style 8-digit TOTP code:
var secret = []byte("SOME_SECRET")
var otp, _ = onetime.Simple(8)
var code = otp.TOTP(secret)
fmt.Println(code)
}
func Example_custom() {
// 9-digit 5-second-step TOTP starting on midnight 2000-01-01 UTC, using SHA-256:
var secret = []byte("SOME_SECRET")
const ts = 5 * time.Second
var t = time.Date(2000, time.January, 1, 0, 0, 0, 0, time.UTC)
var otp = onetime.OneTimePassword{
Digit: 9, TimeStep: ts, BaseTime: t, Hash: sha256.New}
var code = otp.TOTP(secret)
fmt.Println(code)
}</lang>
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