1 files changed, 113 insertions, 0 deletions
diff --git a/ethcrypto/key_store.go b/ethcrypto/key_store.go
new file mode 100644
index 000000000..14d11011f
--- /dev/null
+++ b/ethcrypto/key_store.go
@@ -0,0 +1,113 @@
+package ethcrypto
+
+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)
+}