nak key: generate, public, encrypt, decrypt.

key.go

@@ -0,0 +1,131 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/nbd-wtf/go-nostr"
+	"github.com/nbd-wtf/go-nostr/nip19"
+	"github.com/nbd-wtf/go-nostr/nip49"
+	"github.com/urfave/cli/v2"
+)
+
+var key = &cli.Command{
+	Name:        "key",
+	Usage:       "operations on secret keys: generate, derive, encrypt, decrypt.",
+	Description: ``,
+	Subcommands: []*cli.Command{
+		generate,
+		public,
+		encrypt,
+		decrypt,
+	},
+}
+
+var generate = &cli.Command{
+	Name:        "generate",
+	Usage:       "generates a secret key",
+	Description: ``,
+	Action: func(c *cli.Context) error {
+		sec := nostr.GeneratePrivateKey()
+		stdout(sec)
+		return nil
+	},
+}
+
+var public = &cli.Command{
+	Name:        "public",
+	Usage:       "computes a public key from a secret key",
+	Description: ``,
+	ArgsUsage:   "[secret]",
+	Action: func(c *cli.Context) error {
+		for sec := range getSecretKeyFromStdinLinesOrFirstArgument(c) {
+			pubkey, err := nostr.GetPublicKey(sec)
+			if err != nil {
+				lineProcessingError(c, "failed to derive public key: %s", err)
+				continue
+			}
+			stdout(pubkey)
+		}
+		return nil
+	},
+}
+
+var encrypt = &cli.Command{
+	Name:        "encrypt",
+	Usage:       "encrypts a secret key and prints an ncryptsec code",
+	Description: `uses the NIP-49 standard.`,
+	ArgsUsage:   "<secret> <password>",
+	Flags: []cli.Flag{
+		&cli.IntFlag{
+			Name:        "logn",
+			Usage:       "the bigger the number the harder it will be to bruteforce the password",
+			Value:       16,
+			DefaultText: "16",
+		},
+	},
+	Action: func(c *cli.Context) error {
+		password := c.Args().Get(c.Args().Len() - 1)
+		if password == "" {
+			return fmt.Errorf("no password given")
+		}
+		for sec := range getSecretKeyFromStdinLinesOrFirstArgument(c) {
+			ncryptsec, err := nip49.Encrypt(sec, password, uint8(c.Int("logn")), 0x02)
+			if err != nil {
+				lineProcessingError(c, "failed to encrypt: %s", err)
+				continue
+			}
+			stdout(ncryptsec)
+		}
+		return nil
+	},
+}
+
+var decrypt = &cli.Command{
+	Name:        "decrypt",
+	Usage:       "takes an ncrypsec and a password and decrypts it into an nsec",
+	Description: `uses the NIP-49 standard.`,
+	ArgsUsage:   "<ncryptsec-code> <password>",
+	Action: func(c *cli.Context) error {
+		password := c.Args().Get(c.Args().Len() - 1)
+		if password == "" {
+			return fmt.Errorf("no password given")
+		}
+		for ncryptsec := range getStdinLinesOrFirstArgument(c) {
+			sec, err := nip49.Decrypt(ncryptsec, password)
+			if err != nil {
+				lineProcessingError(c, "failed to decrypt: %s", err)
+				continue
+			}
+			nsec, _ := nip19.EncodePrivateKey(sec)
+			stdout(nsec)
+		}
+		return nil
+	},
+}
+
+func getSecretKeyFromStdinLinesOrFirstArgument(c *cli.Context) chan string {
+	ch := make(chan string)
+	go func() {
+		for sec := range getStdinLinesOrFirstArgument(c) {
+			if sec == "" {
+				continue
+			}
+			if strings.HasPrefix(sec, "nsec1") {
+				_, data, err := nip19.Decode(sec)
+				if err != nil {
+					lineProcessingError(c, "invalid nsec code: %s", err)
+					continue
+				}
+				sec = data.(string)
+			}
+			if !nostr.IsValid32ByteHex(sec) {
+				lineProcessingError(c, "invalid hex secret key")
+				continue
+			}
+			ch <- sec
+		}
+		close(ch)
+	}()
+	return ch
+}