77 lines
1.6 KiB
Go
77 lines
1.6 KiB
Go
|
package ethcrypto
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"io/ioutil"
|
||
|
|
"path"
|
||
|
|
"runtime"
|
||
|
|
"strconv"
|
||
|
|
"strings"
|
||
|
|
)
|
||
|
|
|
||
|
|
func InitWords() []string {
|
||
|
|
_, thisfile, _, _ := runtime.Caller(1)
|
||
|
|
filename := path.Join(path.Dir(thisfile), "mnemonic.words.lst")
|
||
|
|
content, err := ioutil.ReadFile(filename)
|
||
|
|
if err != nil {
|
||
|
|
panic(fmt.Errorf("reading mnemonic word list file 'mnemonic.words.lst' failed: ", err))
|
||
|
|
}
|
||
|
|
return strings.Split(string(content), "\n")
|
||
|
|
}
|
||
|
|
|
||
|
|
var words = InitWords()
|
||
|
|
|
||
|
|
// TODO: See if we can refactor this into a shared util lib if we need it multiple times
|
||
|
|
func IndexOf(slice []string, value string) int64 {
|
||
|
|
for p, v := range slice {
|
||
|
|
if v == value {
|
||
|
|
return int64(p)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return -1
|
||
|
|
}
|
||
|
|
|
||
|
|
func MnemonicEncode(message string) []string {
|
||
|
|
var out []string
|
||
|
|
n := int64(len(words))
|
||
|
|
|
||
|
|
for i := 0; i < len(message); i += (len(message) / 8) {
|
||
|
|
x := message[i : i+8]
|
||
|
|
bit, _ := strconv.ParseInt(x, 16, 64)
|
||
|
|
w1 := (bit % n)
|
||
|
|
w2 := ((bit / n) + w1) % n
|
||
|
|
w3 := ((bit / n / n) + w2) % n
|
||
|
|
out = append(out, words[w1], words[w2], words[w3])
|
||
|
|
}
|
||
|
|
return out
|
||
|
|
}
|
||
|
|
|
||
|
|
func MnemonicDecode(wordsar []string) string {
|
||
|
|
var out string
|
||
|
|
n := int64(len(words))
|
||
|
|
|
||
|
|
for i := 0; i < len(wordsar); i += 3 {
|
||
|
|
word1 := wordsar[i]
|
||
|
|
word2 := wordsar[i+1]
|
||
|
|
word3 := wordsar[i+2]
|
||
|
|
w1 := IndexOf(words, word1)
|
||
|
|
w2 := IndexOf(words, word2)
|
||
|
|
w3 := IndexOf(words, word3)
|
||
|
|
|
||
|
|
y := (w2 - w1) % n
|
||
|
|
z := (w3 - w2) % n
|
||
|
|
|
||
|
|
// Golang handles modulo with negative numbers different then most languages
|
||
|
|
// The modulo can be negative, we don't want that.
|
||
|
|
if z < 0 {
|
||
|
|
z += n
|
||
|
|
}
|
||
|
|
if y < 0 {
|
||
|
|
y += n
|
||
|
|
}
|
||
|
|
x := w1 + n*(y) + n*n*(z)
|
||
|
|
out += fmt.Sprintf("%08x", x)
|
||
|
|
}
|
||
|
|
return out
|
||
|
|
}
|