76 lines
2.0 KiB
Go
76 lines
2.0 KiB
Go
package keys
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import (
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"bufio"
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"crypto/sha256"
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"fmt"
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bip39 "github.com/cosmos/go-bip39"
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"github.com/spf13/cobra"
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"github.com/cosmos/cosmos-sdk/client/input"
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)
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const (
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flagUserEntropy = "unsafe-entropy"
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mnemonicEntropySize = 256
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)
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// MnemonicKeyCommand computes the bip39 memonic for input entropy.
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func MnemonicKeyCommand() *cobra.Command {
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cmd := &cobra.Command{
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Use: "mnemonic",
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Short: "Compute the bip39 mnemonic for some input entropy",
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Long: "Create a bip39 mnemonic, sometimes called a seed phrase, by reading from the system entropy. To pass your own entropy, use --unsafe-entropy",
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RunE: func(cmd *cobra.Command, args []string) error {
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var entropySeed []byte
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if userEntropy, _ := cmd.Flags().GetBool(flagUserEntropy); userEntropy {
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// prompt the user to enter some entropy
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buf := bufio.NewReader(cmd.InOrStdin())
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inputEntropy, err := input.GetString("> WARNING: Generate at least 256-bits of entropy and enter the results here:", buf)
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if err != nil {
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return err
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}
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if len(inputEntropy) < 43 {
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return fmt.Errorf("256-bits is 43 characters in Base-64, and 100 in Base-6. You entered %v, and probably want more", len(inputEntropy))
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}
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conf, err := input.GetConfirmation(fmt.Sprintf("> Input length: %d", len(inputEntropy)), buf, cmd.ErrOrStderr())
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if err != nil {
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return err
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}
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if !conf {
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return nil
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}
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// hash input entropy to get entropy seed
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hashedEntropy := sha256.Sum256([]byte(inputEntropy))
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entropySeed = hashedEntropy[:]
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} else {
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// read entropy seed straight from crypto.Rand
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var err error
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entropySeed, err = bip39.NewEntropy(mnemonicEntropySize)
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if err != nil {
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return err
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}
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}
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mnemonic, err := bip39.NewMnemonic(entropySeed)
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if err != nil {
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return err
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}
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cmd.Println(mnemonic)
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return nil
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},
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}
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cmd.Flags().Bool(flagUserEntropy, false, "Prompt the user to supply their own entropy, instead of relying on the system")
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return cmd
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}
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