func (b *Block) Mine(c chan *Block) {
target := targetFromBits(b.Bits)
i := big.NewInt(int64(0))
var n uint32
buf := bytes.NewBuffer([]byte{})
buf.Grow(192)
buf1 := bytes.NewBuffer([]byte{})
buf1.Grow(32)
loop:
for n = 0; n < 4294967295; n++ {
binary.Write(buf, binary.LittleEndian, b.PreviousBlockHash)
binary.Write(buf, binary.LittleEndian, b.MerkleRootHash)
binary.Write(buf, binary.LittleEndian, b.Version)
binary.Write(buf, binary.LittleEndian, b.Timestamp)
binary.Write(buf, binary.LittleEndian, b.Bits)
binary.Write(buf, binary.LittleEndian, n) // current nonce
hash := fastsha256.Sum256(buf.Bytes())
binary.Write(buf1, binary.BigEndian, hash)
hash = fastsha256.Sum256(buf1.Bytes())
buf1.Reset()
binary.Write(buf1, binary.BigEndian, hash)
i.SetBytes(buf1.Bytes())
buf1.Reset()
buf.Reset()
if i.Cmp(target) == -1 {
b.Nonce = n
c <- b
return
}
}
// Update timestamp and restart the process
b.Timestamp = time.Now().UTC().Unix()
goto loop
}
func Miner(blockChan chan *Block, minedBlockChan chan *Block) {
var b *Block
init:
b = <-blockChan
if b == nil {
goto init
}
mine:
target := targetFromBits(b.Bits)
i := big.NewInt(int64(0))
var n uint32
buf := bytes.NewBuffer([]byte{})
buf.Grow(192)
buf1 := bytes.NewBuffer([]byte{})
buf1.Grow(32)
loop:
for n = 0; n < 4294967295; n++ {
select {
case b = <-blockChan:
if b == nil { // cancel mining
goto init
} else {
goto mine
}
default:
binary.Write(buf, binary.LittleEndian, b.PreviousBlockHash)
binary.Write(buf, binary.LittleEndian, b.MerkleRootHash)
binary.Write(buf, binary.LittleEndian, b.Version)
binary.Write(buf, binary.LittleEndian, b.Timestamp)
binary.Write(buf, binary.LittleEndian, b.Bits)
binary.Write(buf, binary.LittleEndian, n) // current nonce
hash := fastsha256.Sum256(buf.Bytes())
binary.Write(buf1, binary.BigEndian, hash)
hash = fastsha256.Sum256(buf1.Bytes())
buf1.Reset()
binary.Write(buf1, binary.BigEndian, hash)
i.SetBytes(buf1.Bytes())
buf1.Reset()
buf.Reset()
if i.Cmp(target) == -1 {
b.Nonce = n
minedBlockChan <- b
goto init
}
runtime.Gosched()
}
}
// Update timestamp and restart the process
b.Timestamp = time.Now().UTC().Unix()
goto loop
}
func ECDSAPublicKeyToString(key ecdsa.PublicKey) string {
x := key.X.Bytes()
y := key.Y.Bytes()
sha := fastsha256.Sum256(append(append([]byte{0x04}, x...), y...)) // should it be 0x04?
ripe := ripemd160.New().Sum(sha[:])
ripesha := fastsha256.Sum256(ripe)
ripedoublesha := fastsha256.Sum256(ripesha[:])
head := ripedoublesha[0:3]
final := append(ripe, head...)
i := new(big.Int)
i.SetBytes(final)
var b []byte
return string(base58.EncodeBig(b, i))
}
func hash(t T) []byte {
buf := new(bytes.Buffer)
gob.NewEncoder(buf).Encode(t)
encoded := buf.Bytes()
buf.Reset()
binary.Write(buf, binary.BigEndian, fastsha256.Sum256(encoded))
return buf.Bytes()
}
func (b *Block) Hash() types.Hash {
buf := bytes.NewBuffer([]byte{})
buf.Grow(192)
buf1 := bytes.NewBuffer([]byte{})
buf1.Grow(32)
binary.Write(buf, binary.LittleEndian, b.PreviousBlockHash)
binary.Write(buf, binary.LittleEndian, b.MerkleRootHash)
binary.Write(buf, binary.LittleEndian, b.Version)
binary.Write(buf, binary.LittleEndian, b.Timestamp)
binary.Write(buf, binary.LittleEndian, b.Bits)
binary.Write(buf, binary.LittleEndian, b.Nonce)
hash := fastsha256.Sum256(buf.Bytes())
binary.Write(buf1, binary.BigEndian, hash)
hash = fastsha256.Sum256(buf1.Bytes())
buf1.Reset()
binary.Write(buf1, binary.BigEndian, hash)
return buf1.Bytes()
}
func NewNameReservation(name string, publicKey *ecdsa.PublicKey) (txn *NameReservation, random []byte) {
buf := make([]byte, 4)
rand.Read(buf)
return &NameReservation{
Version: NAME_RESERVATION_VERSION,
Hashed: fastsha256.Sum256(append([]byte(name), buf...)),
PublicKey: []byte(keys.ECDSAPublicKeyToString(*publicKey))},
buf
}
// checkAuth checks the HTTP Basic authentication supplied by a wallet
// or RPC client in the HTTP request r. If the supplied authentication
// does not match the username and password expected, a non-nil error is
// returned.
//
// This check is time-constant.
func (s *rpcServer) checkAuth(r *http.Request, require bool) (bool, error) {
authhdr := r.Header["Authorization"]
if len(authhdr) <= 0 {
if require {
rpcsLog.Warnf("RPC authentication failure from %s",
r.RemoteAddr)
return false, errors.New("auth failure")
}
return false, nil
}
authsha := fastsha256.Sum256([]byte(authhdr[0]))
cmp := subtle.ConstantTimeCompare(authsha[:], s.authsha[:])
if cmp != 1 {
rpcsLog.Warnf("RPC authentication failure from %s", r.RemoteAddr)
return false, errors.New("auth failure")
}
return true, nil
}
func SHA256(buf []byte) []byte {
result := fastsha256.Sum256(buf)
return result[:]
}
// newRPCServer returns a new instance of the rpcServer struct.
func newRPCServer(listenAddrs []string, s *server) (*rpcServer, error) {
login := cfg.RPCUser + ":" + cfg.RPCPass
auth := "Basic " + base64.StdEncoding.EncodeToString([]byte(login))
rpc := rpcServer{
authsha: fastsha256.Sum256([]byte(auth)),
server: s,
quit: make(chan int),
}
rpc.ntfnMgr = newWsNotificationManager(&rpc)
// check for existence of cert file and key file
if !fileExists(cfg.RPCKey) && !fileExists(cfg.RPCCert) {
// if both files do not exist, we generate them.
err := genCertPair(cfg.RPCCert, cfg.RPCKey)
if err != nil {
return nil, err
}
}
keypair, err := tls.LoadX509KeyPair(cfg.RPCCert, cfg.RPCKey)
if err != nil {
return nil, err
}
tlsConfig := tls.Config{
Certificates: []tls.Certificate{keypair},
}
// TODO(oga) this code is similar to that in server, should be
// factored into something shared.
ipv4ListenAddrs, ipv6ListenAddrs, _, err := parseListeners(listenAddrs)
if err != nil {
return nil, err
}
listeners := make([]net.Listener, 0,
len(ipv6ListenAddrs)+len(ipv4ListenAddrs))
for _, addr := range ipv4ListenAddrs {
listener, err := tls.Listen("tcp4", addr, &tlsConfig)
if err != nil {
rpcsLog.Warnf("Can't listen on %s: %v", addr,
err)
continue
}
listeners = append(listeners, listener)
}
for _, addr := range ipv6ListenAddrs {
listener, err := tls.Listen("tcp6", addr, &tlsConfig)
if err != nil {
rpcsLog.Warnf("Can't listen on %s: %v", addr,
err)
continue
}
listeners = append(listeners, listener)
}
if len(listeners) == 0 {
return nil, errors.New("RPCS: No valid listen address")
}
rpc.listeners = listeners
return &rpc, nil
}