mirror of
https://github.com/fiatjaf/nak.git
synced 2024-11-22 08:19:06 -05:00
294 lines
8.1 KiB
Go
294 lines
8.1 KiB
Go
package main
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import (
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"context"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"strings"
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"github.com/btcsuite/btcd/btcec/v2"
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"github.com/btcsuite/btcd/btcec/v2/schnorr/musig2"
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"github.com/decred/dcrd/dcrec/secp256k1/v4"
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"github.com/fiatjaf/cli/v3"
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"github.com/nbd-wtf/go-nostr"
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"github.com/nbd-wtf/go-nostr/nip19"
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"github.com/nbd-wtf/go-nostr/nip49"
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)
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var key = &cli.Command{
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Name: "key",
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Usage: "operations on secret keys: generate, derive, encrypt, decrypt.",
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Description: ``,
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DisableSliceFlagSeparator: true,
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Commands: []*cli.Command{
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generate,
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public,
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encryptKey,
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decryptKey,
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combine,
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},
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}
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var generate = &cli.Command{
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Name: "generate",
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Usage: "generates a secret key",
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Description: ``,
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DisableSliceFlagSeparator: true,
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Action: func(ctx context.Context, c *cli.Command) error {
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sec := nostr.GeneratePrivateKey()
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stdout(sec)
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return nil
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},
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}
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var public = &cli.Command{
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Name: "public",
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Usage: "computes a public key from a secret key",
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Description: ``,
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ArgsUsage: "[secret]",
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DisableSliceFlagSeparator: true,
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Flags: []cli.Flag{
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&cli.BoolFlag{
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Name: "with-parity",
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Usage: "output 33 bytes instead of 32, the first one being either '02' or '03', a prefix indicating whether this pubkey is even or odd.",
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},
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},
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Action: func(ctx context.Context, c *cli.Command) error {
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for sec := range getSecretKeysFromStdinLinesOrSlice(ctx, c, c.Args().Slice()) {
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b, _ := hex.DecodeString(sec)
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_, pk := btcec.PrivKeyFromBytes(b)
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if c.Bool("with-parity") {
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stdout(hex.EncodeToString(pk.SerializeCompressed()))
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} else {
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stdout(hex.EncodeToString(pk.SerializeCompressed()[1:]))
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}
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}
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return nil
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},
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}
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var encryptKey = &cli.Command{
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Name: "encrypt",
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Usage: "encrypts a secret key and prints an ncryptsec code",
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Description: `uses the NIP-49 standard.`,
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ArgsUsage: "<secret> <password>",
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DisableSliceFlagSeparator: true,
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Flags: []cli.Flag{
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&cli.IntFlag{
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Name: "logn",
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Usage: "the bigger the number the harder it will be to bruteforce the password",
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Value: 16,
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DefaultText: "16",
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},
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},
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Action: func(ctx context.Context, c *cli.Command) error {
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keys := make([]string, 0, 1)
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var password string
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switch c.Args().Len() {
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case 1:
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password = c.Args().Get(0)
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case 2:
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keys = append(keys, c.Args().Get(0))
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password = c.Args().Get(1)
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}
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if password == "" {
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return fmt.Errorf("no password given")
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}
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for sec := range getSecretKeysFromStdinLinesOrSlice(ctx, c, keys) {
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ncryptsec, err := nip49.Encrypt(sec, password, uint8(c.Int("logn")), 0x02)
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if err != nil {
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ctx = lineProcessingError(ctx, "failed to encrypt: %s", err)
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continue
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}
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stdout(ncryptsec)
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}
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return nil
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},
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}
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var decryptKey = &cli.Command{
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Name: "decrypt",
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Usage: "takes an ncrypsec and a password and decrypts it into an nsec",
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Description: `uses the NIP-49 standard.`,
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ArgsUsage: "<ncryptsec-code> <password>",
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DisableSliceFlagSeparator: true,
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Action: func(ctx context.Context, c *cli.Command) error {
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var ncryptsec string
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var password string
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switch c.Args().Len() {
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case 2:
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ncryptsec = c.Args().Get(0)
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password = c.Args().Get(1)
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if password == "" {
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return fmt.Errorf("no password given")
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}
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sec, err := nip49.Decrypt(ncryptsec, password)
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if err != nil {
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return fmt.Errorf("failed to decrypt: %s", err)
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}
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stdout(sec)
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return nil
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case 1:
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if arg := c.Args().Get(0); strings.HasPrefix(arg, "ncryptsec1") {
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ncryptsec = arg
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if res, err := promptDecrypt(ncryptsec); err != nil {
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return err
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} else {
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stdout(res)
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return nil
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}
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} else {
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password = c.Args().Get(0)
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for ncryptsec := range getStdinLinesOrArgumentsFromSlice([]string{ncryptsec}) {
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sec, err := nip49.Decrypt(ncryptsec, password)
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if err != nil {
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ctx = lineProcessingError(ctx, "failed to decrypt: %s", err)
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continue
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}
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stdout(sec)
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}
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return nil
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}
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default:
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return fmt.Errorf("invalid number of arguments")
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}
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},
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}
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var combine = &cli.Command{
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Name: "combine",
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Usage: "combines two or more pubkeys using musig2",
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Description: `The public keys must have 33 bytes (66 characters hex), with the 02 or 03 prefix. It is common in Nostr to drop that first byte, so you'll have to derive the public keys again from the private keys in order to get it back.
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However, if the intent is to check if two existing Nostr pubkeys match a given combined pubkey, then it might be sufficient to calculate the combined key for all the possible combinations of pubkeys in the input.`,
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ArgsUsage: "[pubkey...]",
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DisableSliceFlagSeparator: true,
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Action: func(ctx context.Context, c *cli.Command) error {
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type Combination struct {
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Variants []string `json:"input_variants"`
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Output struct {
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XOnly string `json:"x_only"`
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Variant string `json:"variant"`
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} `json:"combined_key"`
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}
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type Result struct {
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Keys []string `json:"keys"`
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Combinations []Combination `json:"combinations"`
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}
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result := Result{}
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result.Keys = c.Args().Slice()
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keyGroups := make([][]*btcec.PublicKey, 0, len(result.Keys))
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for i, keyhex := range result.Keys {
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keyb, err := hex.DecodeString(keyhex)
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if err != nil {
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return fmt.Errorf("error parsing key %s: %w", keyhex, err)
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}
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if len(keyb) == 32 /* we'll use both the 02 and the 03 prefix versions */ {
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group := make([]*btcec.PublicKey, 2)
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for i, prefix := range []byte{0x02, 0x03} {
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pubk, err := btcec.ParsePubKey(append([]byte{prefix}, keyb...))
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if err != nil {
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log("error parsing key %s: %s", keyhex, err)
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continue
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}
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group[i] = pubk
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}
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keyGroups = append(keyGroups, group)
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} else /* assume it's 33 */ {
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pubk, err := btcec.ParsePubKey(keyb)
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if err != nil {
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return fmt.Errorf("error parsing key %s: %w", keyhex, err)
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}
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keyGroups = append(keyGroups, []*btcec.PublicKey{pubk})
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// remove the leading byte from the output just so it is all uniform
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result.Keys[i] = result.Keys[i][2:]
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}
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}
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result.Combinations = make([]Combination, 0, 16)
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var fn func(prepend int, curr []int)
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fn = func(prepend int, curr []int) {
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curr = append([]int{prepend}, curr...)
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if len(curr) == len(keyGroups) {
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combi := Combination{
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Variants: make([]string, len(keyGroups)),
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}
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combining := make([]*btcec.PublicKey, len(keyGroups))
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for g, altKeys := range keyGroups {
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altKey := altKeys[curr[g]]
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variant := secp256k1.PubKeyFormatCompressedEven
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if altKey.Y().Bit(0) == 1 {
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variant = secp256k1.PubKeyFormatCompressedOdd
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}
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combi.Variants[g] = hex.EncodeToString([]byte{variant})
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combining[g] = altKey
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}
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agg, _, _, err := musig2.AggregateKeys(combining, true)
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if err != nil {
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log("error aggregating: %s", err)
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return
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}
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serialized := agg.FinalKey.SerializeCompressed()
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combi.Output.XOnly = hex.EncodeToString(serialized[1:])
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combi.Output.Variant = hex.EncodeToString(serialized[0:1])
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result.Combinations = append(result.Combinations, combi)
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return
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}
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fn(0, curr)
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if len(keyGroups[len(keyGroups)-len(curr)-1]) > 1 {
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fn(1, curr)
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}
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}
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fn(0, nil)
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if len(keyGroups[len(keyGroups)-1]) > 1 {
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fn(1, nil)
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}
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res, _ := json.MarshalIndent(result, "", " ")
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stdout(string(res))
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return nil
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},
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}
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func getSecretKeysFromStdinLinesOrSlice(ctx context.Context, _ *cli.Command, keys []string) chan string {
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ch := make(chan string)
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go func() {
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for sec := range getStdinLinesOrArgumentsFromSlice(keys) {
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if sec == "" {
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continue
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}
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if strings.HasPrefix(sec, "nsec1") {
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_, data, err := nip19.Decode(sec)
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if err != nil {
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ctx = lineProcessingError(ctx, "invalid nsec code: %s", err)
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continue
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}
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sec = data.(string)
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}
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sec = leftPadKey(sec)
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if !nostr.IsValid32ByteHex(sec) {
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ctx = lineProcessingError(ctx, "invalid hex key")
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continue
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}
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ch <- sec
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}
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close(ch)
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}()
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return ch
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}
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