path: root/crypto/key_store.go

package crypto

import (
    "fmt"
    "io/ioutil"
    "os"
    "path"
    "strings"

    "github.com/ethereum/go-ethereum/ethutil"
)

type KeyStore interface {
    Load(string) (*KeyRing, error)
    Save(string, *KeyRing) error
}

type DBKeyStore struct {
    db ethutil.Database
}

const dbKeyPrefix = "KeyRing"

func (k *DBKeyStore) dbKey(session string) []byte {
    return []byte(fmt.Sprintf("%s%s", dbKeyPrefix, session))
}

func (k *DBKeyStore) Save(session string, keyRing *KeyRing) error {
    k.db.Put(k.dbKey(session), keyRing.RlpEncode())
    return nil
}

func (k *DBKeyStore) Load(session string) (*KeyRing, error) {
    data, err := k.db.Get(k.dbKey(session))
    if err != nil {
        return nil, nil
    }
    var keyRing *KeyRing
    keyRing, err = NewKeyRingFromBytes(data)
    if err != nil {
        return nil, err
    }
    // if empty keyRing is found we return nil, no error
    if keyRing.Len() == 0 {
        return nil, nil
    }
    return keyRing, nil
}

type FileKeyStore struct {
    basedir string
}

func (k *FileKeyStore) Save(session string, keyRing *KeyRing) error {
    var content []byte
    var err error
    var privateKeys []string
    var publicKeys []string
    var mnemonics []string
    var addresses []string
    keyRing.Each(func(keyPair *KeyPair) {
        privateKeys = append(privateKeys, ethutil.Bytes2Hex(keyPair.PrivateKey))
        publicKeys = append(publicKeys, ethutil.Bytes2Hex(keyPair.PublicKey))
        addresses = append(addresses, ethutil.Bytes2Hex(keyPair.Address()))
        mnemonics = append(mnemonics, keyPair.Mnemonic())
    })

    basename := session
    if session == "" {
        basename = "default"
    }

    path := path.Join(k.basedir, basename)
    content = []byte(strings.Join(privateKeys, "\n"))
    err = ioutil.WriteFile(path+".prv", content, 0600)
    if err != nil {
        return err
    }

    content = []byte(strings.Join(publicKeys, "\n"))
    err = ioutil.WriteFile(path+".pub", content, 0644)
    if err != nil {
        return err
    }

    content = []byte(strings.Join(addresses, "\n"))
    err = ioutil.WriteFile(path+".addr", content, 0644)
    if err != nil {
        return err
    }

    content = []byte(strings.Join(mnemonics, "\n"))
    err = ioutil.WriteFile(path+".mne", content, 0600)
    if err != nil {
        return err
    }

    return nil
}

func (k *FileKeyStore) Load(session string) (*KeyRing, error) {
    basename := session
    if session == "" {
        basename = "default"
    }
    secfile := path.Join(k.basedir, basename+".prv")
    _, err := os.Stat(secfile)
    // if file is not found then we return nil, no error
    if err != nil {
        return nil, nil
    }
    return NewKeyRingFromFile(secfile)
}