path: root/ethutil/keypair.go

package ethutil

import (
    "github.com/obscuren/secp256k1-go"
)

type KeyPair struct {
    PrivateKey []byte
    PublicKey  []byte

    // The associated account
    account *StateObject
}

func NewKeyPairFromSec(seckey []byte) (*KeyPair, error) {
    pubkey, err := secp256k1.GeneratePubKey(seckey)
    if err != nil {
        return nil, err
    }

    return &KeyPair{PrivateKey: seckey, PublicKey: pubkey}, nil
}

func NewKeyPairFromValue(val *Value) *KeyPair {
    v, _ := NewKeyPairFromSec(val.Bytes())

    return v
}

func (k *KeyPair) Address() []byte {
    return Sha3Bin(k.PublicKey[1:])[12:]
}

func (k *KeyPair) RlpEncode() []byte {
    return k.RlpValue().Encode()
}

func (k *KeyPair) RlpValue() *Value {
    return NewValue(k.PrivateKey)
}

type KeyRing struct {
    keys []*KeyPair
}

func (k *KeyRing) Add(pair *KeyPair) {
    k.keys = append(k.keys, pair)
}

func (k *KeyRing) Get(i int) *KeyPair {
    if len(k.keys) > i {
        return k.keys[i]
    }

    return nil
}

func (k *KeyRing) Len() int {
    return len(k.keys)
}

func (k *KeyRing) NewKeyPair(sec []byte) (*KeyPair, error) {
    keyPair, err := NewKeyPairFromSec(sec)
    if err != nil {
        return nil, err
    }

    k.Add(keyPair)
    Config.Db.Put([]byte("KeyRing"), k.RlpValue().Encode())

    return keyPair, nil
}

func (k *KeyRing) Reset() {
    Config.Db.Put([]byte("KeyRing"), nil)
    k.keys = nil
}

func (k *KeyRing) RlpValue() *Value {
    v := EmptyValue()
    for _, keyPair := range k.keys {
        v.Append(keyPair.RlpValue())
    }

    return v
}

// The public "singleton" keyring
var keyRing *KeyRing

func GetKeyRing() *KeyRing {
    if keyRing == nil {
        keyRing = &KeyRing{}

        data, _ := Config.Db.Get([]byte("KeyRing"))
        it := NewValueFromBytes(data).NewIterator()
        for it.Next() {
            v := it.Value()

            key, err := NewKeyPairFromSec(v.Bytes())
            if err != nil {
                panic(err)
            }
            keyRing.Add(key)
        }
    }

    return keyRing
}