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December 22, 2020 20:35
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JWT go example signing methods
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import ( | |
"fmt" | |
"io/ioutil" | |
"time" | |
"github.com/dgrijalva/jwt-go" | |
) | |
func signingWithHMAC() { | |
sampleSecret := []byte("your-256-bit-secret") | |
newToken := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{ | |
"foo": "bar", | |
"nbf": time.Now().Unix(), | |
}) | |
tokenString, err := newToken.SignedString(sampleSecret) | |
if err != nil { | |
fmt.Errorf("%v", err) | |
} | |
fmt.Println("HS token:", tokenString) | |
token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) { | |
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok { | |
return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"]) | |
} | |
return sampleSecret, nil | |
}) | |
if err != nil { | |
fmt.Printf("%v", err) | |
} | |
claims, ok := token.Claims.(jwt.MapClaims) | |
if ok && token.Valid { | |
fmt.Println(claims) | |
} | |
} | |
func signingWithRSA() { | |
privateKeyPem, _ := ioutil.ReadFile("sample_key") | |
publicKeyPem, _ := ioutil.ReadFile("sample_key.pub") | |
privateKey, err := jwt.ParseRSAPrivateKeyFromPEM(privateKeyPem) | |
if err != nil { | |
fmt.Errorf("%v", err) | |
} | |
publicKey, err := jwt.ParseRSAPublicKeyFromPEM(publicKeyPem) | |
if err != nil { | |
fmt.Errorf("%v", err) | |
} | |
newToken := jwt.NewWithClaims(jwt.SigningMethodRS256, jwt.MapClaims{ | |
"foo": "bar", | |
"nbf": time.Now().Unix(), | |
}) | |
tokenString, err := newToken.SignedString(privateKey) | |
if err != nil { | |
fmt.Errorf("%v", err) | |
} | |
fmt.Println("RSA token:", tokenString) | |
token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) { | |
if _, ok := token.Method.(*jwt.SigningMethodRSA); !ok { | |
return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"]) | |
} | |
return publicKey, nil | |
}) | |
claims, ok := token.Claims.(jwt.MapClaims) | |
if ok && token.Valid { | |
fmt.Println(claims) | |
} | |
} | |
func main() { | |
signingWithHMAC() | |
signingWithRSA() | |
} |
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