ed25519 keygen

internal/keygen/ed25519.go

@@ -0,0 +1,59 @@
+package keygen
+
+import (
+	"crypto/ed25519"
+	"encoding/hex"
+	"flag"
+	"fmt"
+	"io"
+	"os"
+)
+
+func Ed25519(args ...string) error {
+	fset := flag.NewFlagSet("gen-ed25519", flag.ContinueOnError)
+	fset.Usage = func() {
+		fmt.Fprint(os.Stderr, `Usage: pocryp gen-ed25519 [-out OUTPUT] [-bin]
+
+Generate ED25519 key.
+
+If -out is not specified, the output will be printed to stdout.
+
+Options:
+`)
+		fset.PrintDefaults()
+	}
+
+	fOutput := fset.String("out", "", "Write the result to the file at path OUTPUT.")
+	fBin := fset.Bool("bin", false, "Write output as binary not hex.")
+
+	if err := fset.Parse(args); err != nil {
+		return err
+	}
+
+	var w io.Writer
+	if *fOutput == "" {
+		w = os.Stdout
+	} else {
+		f, err := os.Create(*fOutput)
+		if err != nil {
+			return err
+		}
+		defer f.Close()
+		w = f
+	}
+
+	key, _, err := ed25519.GenerateKey(nil)
+	if err != nil {
+		return err
+	}
+
+	if *fBin {
+		if _, err := w.Write(key); err != nil {
+			return err
+		}
+	} else {
+		fmt.Fprintln(w, hex.EncodeToString(key))
+	}
+
+	return nil
+}

main.go

@@ -30,6 +30,11 @@ func main() {
 			Usage: "Generate RSA key",
 			Run:   keygen.Rsa,
 		},
+		app.Command{
+			Name:  "gen-ed25519",
+			Usage: "Generate ED25519 key",
+			Run:   keygen.Ed25519,
+		},
 	)
 
 	a.Add(

progress.md

@@ -2,6 +2,7 @@
 
 - [x] AES
 - [x] RSA
+- [x] ED25519
 
 # Block Cipher