Go Snippets

jwt_es256.go

privateKey := "YOU-PRIVATE-KEY"

// atClaims := jwt.MapClaims{}
// atClaims["exp"] = time.Now().Add(time.Minute*15).UnixMilli()
// atClaims["aud"] = "Audience" // OPTIONAL AUDIENCE 

atClaims := jwt.StandardClaims{
	IssuedAt:  time.Now().Unix(),
	ExpiresAt: time.Now().Add(30 * time.Second).unix(),
}

token := jwt.NewWithClaims(jwt.SigningMethodES256, atClaims)
token.Header["kid"] = "KEY-IDENTIFIER"

block, _ := pem.Decode([]byte(privateKey))

key, err := x509.ParsePKCS8PrivateKey(block.Bytes)
if err != nil {
fmt.Println("Error parsing private key ", err.Error())
	return "", err
}

signedToken, err := token.SignedString(key)
if err != nil {
	fmt.Println("Error signing token ", err.Error())
	return "", err
}

fmt.Println("signedToken: ", signedToken)