forked from brianium/mnemonic
/
mnemonic.go
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/
mnemonic.go
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package mnemonic
import (
"fmt"
"strconv"
"strings"
"github.com/pepa65/mnemonic/entropy"
)
// Mnemonic represents a collection of human readable words
// used for HD wallet seed generation
type Mnemonic struct {
Words []string
Language Language
}
// New returns a new Mnemonic for the given entropy and language
func New(ent []byte, lang Language) (*Mnemonic, error) {
const chunkSize = 11
bits := entropy.CheckSummed(ent)
length := len(bits)
words := make([]string, length/11)
for i := 0; i < length; i += chunkSize {
stringVal := string(bits[i : chunkSize+i])
intVal, err := strconv.ParseInt(stringVal, 2, 64)
if err != nil {
return nil, fmt.Errorf("Could not convert %s to word index", stringVal)
}
word, err := GetWord(lang, intVal)
if err != nil {
return nil, err
}
words[(chunkSize+i)/11-1] = word
}
m := Mnemonic{words, lang}
return &m, nil
}
// NewRandom returns a new Mnemonic with random entropy of the given length
// in bits
func NewRandom(length int, lang Language) (*Mnemonic, error) {
ent, err := entropy.Random(length)
if err != nil {
return nil, fmt.Errorf("Error generating random entropy: %s", err)
}
return New(ent, lang)
}
// Sentence returns a Mnemonic's word collection as a space separated
// sentence
func (m *Mnemonic) Sentence() string {
if m.Language == Japanese {
return strings.Join(m.Words, ` `)
}
return strings.Join(m.Words, " ")
}
// GenerateSeed returns a seed used for wallet generation per
// BIP-0032 or similar method. The internal Words set
// of the Mnemonic will be used
func (m *Mnemonic) GenerateSeed(passphrase string) *Seed {
return NewSeed(m.Sentence(), passphrase)
}