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keyfunc mnemonic derives a 12, 18 or 24 word child mnemonic through BIP-85's own mnemonic application, with the specification's test vectors as tests. One review round, passed with no findings; the reviewer reproduced the vectors from an implementation written from the specification alone. Model: opus-5 (implementation and review); fable-5-1 (landing)
66 lines
1.4 KiB
Go
66 lines
1.4 KiB
Go
// Package mnemonic is the command that prints a child mnemonic.
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package mnemonic
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import (
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"fmt"
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"git.eeqj.de/sneak/keyfunc/internal/childmnemonic"
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"git.eeqj.de/sneak/keyfunc/internal/cli/options"
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"git.eeqj.de/sneak/keyfunc/internal/derive"
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"github.com/spf13/cobra"
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)
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// Command returns the mnemonic command.
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func Command() *cobra.Command {
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cmd := &cobra.Command{
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Use: "mnemonic",
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Short: "print a child mnemonic derived from the main one",
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Args: cobra.NoArgs,
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RunE: func(cmd *cobra.Command, _ []string) error {
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child, err := derived(cmd)
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if err != nil {
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return err
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}
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_, err = fmt.Fprintln(cmd.OutOrStdout(), child)
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if err != nil {
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return fmt.Errorf("writing the mnemonic: %w", err)
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}
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return nil
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},
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}
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cmd.Flags().Uint32(
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"words", childmnemonic.DefaultWords,
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"how long the child mnemonic is: 12, 18 or 24 words",
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)
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return cmd
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}
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// derived returns the child mnemonic this run asks for.
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func derived(cmd *cobra.Command) (string, error) {
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index, err := options.Index(cmd)
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if err != nil {
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return "", err
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}
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words, err := cmd.Flags().GetUint32("words")
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if err != nil {
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return "", fmt.Errorf("reading the word count: %w", err)
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}
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parent, err := options.Mnemonic(cmd)
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if err != nil {
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return "", err
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}
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master, err := derive.Master(parent)
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if err != nil {
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return "", err
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}
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return childmnemonic.Derive(master, words, index)
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}
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