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wallet.go
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wallet.go
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package main
import (
"crypto/aes"
"crypto/cipher"
"crypto/md5"
"crypto/rand"
"encoding/hex"
"encoding/json"
"errors"
"io"
"io/ioutil"
"os"
)
type Wallet struct {
Coins []Coin `json:"coins"`
}
func (wallet Wallet) CreateHash(key string) string {
hasher := md5.New()
hasher.Write([]byte(key))
return hex.EncodeToString(hasher.Sum(nil))
}
func (wallet Wallet) Encrypt(passphrase string) ([]byte, error) {
block, err := aes.NewCipher([]byte(wallet.CreateHash(passphrase)))
if err != nil {
return nil, err
}
gcm, err := cipher.NewGCM(block)
if err != nil {
return nil, err
}
nonce := make([]byte, gcm.NonceSize())
io.ReadFull(rand.Reader, nonce)
data, err := json.Marshal(wallet)
if err != nil {
return nil, err
}
ciphertext := gcm.Seal(nonce, nonce, data, nil)
return ciphertext, nil
}
func (wallet *Wallet) Decrypt(data []byte, passphrase string) error {
block, err := aes.NewCipher([]byte(wallet.CreateHash(passphrase)))
if err != nil {
return err
}
gcm, err := cipher.NewGCM(block)
if err != nil {
return err
}
nonceSize := gcm.NonceSize()
nonce, ciphertext := data[:nonceSize], data[nonceSize:]
plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
if err != nil {
return err
}
json.Unmarshal(plaintext, wallet)
return nil
}
func (wallet Wallet) EncryptFile(passphrase string) error {
file, err := os.Create("wallet.dat")
if err != nil {
return err
}
defer file.Close()
data, err := wallet.Encrypt(passphrase)
if err != nil {
return err
}
_, err = file.Write(data)
return err
}
func (wallet *Wallet) DecryptFile(passphrase string) error {
ciphertext, err := ioutil.ReadFile("wallet.dat")
if err != nil {
return err
}
err = wallet.Decrypt(ciphertext, passphrase)
if err != nil {
return err
}
return nil
}
func (wallet Wallet) Create(key string) error {
err := wallet.EncryptFile(key)
return err
}
func (wallet Wallet) Destroy() error {
err := os.Remove("wallet.dat")
return err
}
func (wallet Wallet) Import(coin Coin, passphrase string) error {
if coin == (Coin{}) {
return errors.New("The coin must be valid")
}
wallet.Coins = append(wallet.Coins, coin)
wallet.EncryptFile(passphrase)
return nil
}
func (wallet *Wallet) Dump(passphrase string) error {
err := wallet.DecryptFile(passphrase)
if err != nil {
return errors.New(`{ "message": "The password is not correct" }`)
}
return nil
}
func (wallet *Wallet) GetAddresses(passphrase string) error {
err := wallet.DecryptFile(passphrase)
if err != nil {
return errors.New(`{ "message": "The password is not correct" }`)
}
for index, _ := range wallet.Coins {
wallet.Coins[index].WIF = ""
}
return nil
}
func (wallet *Wallet) Authenticate(passphrase string) bool {
err := wallet.DecryptFile(passphrase)
if err != nil {
return false
}
return true
}