// ReadKeyFileToECPriv returns an extendedkey from a file.
// If there's no file there, it'll make one. If there's a password needed,
// it'll prompt for one. One stop function.
func ReadKeyFileToECPriv(
filename string, p *chaincfg.Params) (*hdkeychain.ExtendedKey, error) {
key32 := new([32]byte)
_, err := os.Stat(filename)
if err != nil {
if os.IsNotExist(err) {
// no key found, generate and save one
fmt.Printf("No file %s, generating.\n", filename)
rn, err := hdkeychain.GenerateSeed(32)
if err != nil {
return nil, err
}
copy(key32[:], rn[:])
err = SaveKeyToFileInteractive(filename, key32)
if err != nil {
return nil, err
}
} else {
// unknown error, crash
fmt.Printf("unknown\n")
return nil, err
}
}
key, err := LoadKeyFromFileInteractive(filename)
if err != nil {
return nil, err
}
rootpriv, err := hdkeychain.NewMaster(key[:], p)
if err != nil {
return nil, err
}
return rootpriv, nil
}
// Seed prompts the user whether they want to use an existing wallet generation
// seed. When the user answers no, a seed will be generated and displayed to
// the user along with prompting them for confirmation. When the user answers
// yes, a the user is prompted for it. All prompts are repeated until the user
// enters a valid response.
func Seed(reader *bufio.Reader) ([]byte, error) {
// Ascertain the wallet generation seed.
useUserSeed, err := promptListBool(reader, "Do you have an "+
"existing wallet seed you want to use?", "no")
if err != nil {
return nil, err
}
if !useUserSeed {
seed, err := hdkeychain.GenerateSeed(hdkeychain.RecommendedSeedLen)
if err != nil {
return nil, err
}
fmt.Println("Your wallet generation seed is:")
fmt.Printf("%x\n", seed)
fmt.Println("IMPORTANT: Keep the seed in a safe place as you\n" +
"will NOT be able to restore your wallet without it.")
fmt.Println("Please keep in mind that anyone who has access\n" +
"to the seed can also restore your wallet thereby\n" +
"giving them access to all your funds, so it is\n" +
"imperative that you keep it in a secure location.")
for {
fmt.Print(`Once you have stored the seed in a safe ` +
`and secure location, enter "OK" to continue: `)
confirmSeed, err := reader.ReadString('\n')
if err != nil {
return nil, err
}
confirmSeed = strings.TrimSpace(confirmSeed)
confirmSeed = strings.Trim(confirmSeed, `"`)
if confirmSeed == "OK" {
break
}
}
return seed, nil
}
for {
fmt.Print("Enter existing wallet seed: ")
seedStr, err := reader.ReadString('\n')
if err != nil {
return nil, err
}
seedStr = strings.TrimSpace(strings.ToLower(seedStr))
seed, err := hex.DecodeString(seedStr)
if err != nil || len(seed) < hdkeychain.MinSeedBytes ||
len(seed) > hdkeychain.MaxSeedBytes {
fmt.Printf("Invalid seed specified. Must be a "+
"hexadecimal value that is at least %d bits and "+
"at most %d bits\n", hdkeychain.MinSeedBytes*8,
hdkeychain.MaxSeedBytes*8)
continue
}
return seed, nil
}
}