An easy way to do shamir secret sharing from the command line

shamir.go

package main

import (
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"strings"

	sssa "github.com/SSSAAS/sssa-golang"
	"github.com/urfave/cli"
)

func main() {
	app := cli.NewApp()
	app.Name = "shamir"
	app.Usage = "command line tool for easy Shamir Secret Sharing"

	app.Commands = []cli.Command{
		{
			Name: "share",
			Flags: []cli.Flag{
				cli.IntFlag{
					Name: "minimum, m",
				},
				cli.IntFlag{
					Name: "total, t",
				},
				cli.StringFlag{
					Name: "secret, s",
				},
			},
			Action: func(c *cli.Context) error {
				shares, err := sssa.Create(c.Int("minimum"), c.Int("total"), c.String("secret"))
				if err != nil {
					return err
				}
				fmt.Println(strings.Join(shares, "\n"))
				return nil
			},
		},
		{
			Name:  "unite",
			Usage: "shares read from stdin, one per line",
			Action: func(c *cli.Context) error {
				stdinBytes, err := ioutil.ReadAll(os.Stdin)
				if err != nil {
					return err
				}
				stdinText := strings.TrimSpace(string(stdinBytes))

				shares := make([]string, 0)
				for _, line := range strings.Split(stdinText, "\n") {
					shares = append(shares, line)
				}

				secret, err := sssa.Combine(shares)
				if err != nil {
					return err
				}
				fmt.Println(secret)
				return nil
			},
		},
	}

	err := app.Run(os.Args)
	if err != nil {
		log.Fatal(err)
	}
}