add initial node

README.md

@@ -2,6 +2,8 @@
 
 Slow, decentralized and cryptographically consistent database
 
-Basically this repo is a blockchain written from scratch, that allows to launch multiple simultaneous blockchains. The motivation of this project is to fill the empty hours during a travel.
+Basically this repo is a blockchain written from scratch, that allows to launch multiple simultaneous blockchains.
+
+Watch the blockchain in action: http://www.youtubemultiplier.com/5ca9c1a540b31-slowlorisdb-visual-representation.php
 
 ![slowloris](https://04019a5a-a-62cb3a1a-s-sites.googlegroups.com/site/jchristensensdigitalportfolio/slow-loris/IO-moth-eating-frozen-apple-sauce.jpg "slowloris")

core/blockchain.go

@@ -2,8 +2,9 @@ package core
 
 import (
 	"errors"
-	"slothdb/db"
 	"time"
+
+	"github.com/arnaucube/slowlorisdb/db"
 )
 
 type Blockchain struct {

core/blockchain_test.go

@@ -2,9 +2,9 @@ package core
 
 import (
 	"io/ioutil"
-	"slothdb/db"
 	"testing"
 
+	"github.com/arnaucube/slowlorisdb/db"
 	"github.com/stretchr/testify/assert"
 )
 

core/keys.go

@@ -45,26 +45,35 @@ func AddressFromPrivK(privK *ecdsa.PrivateKey) Address {
 	return Address(h)
 }
 
-func PackSignature(r, s *big.Int) []byte {
-	sig := r.Bytes()
-	sig = append(sig, s.Bytes()...)
-	return sig
+func (sig *Signature) Bytes(r, s *big.Int) []byte {
+	b := r.Bytes()
+	b = append(b, s.Bytes()...)
+	return b
 }
 
-func UnpackSignature(sig []byte) (*big.Int, *big.Int, error) {
-	if len(sig) != 64 {
-		return nil, nil, errors.New("Invalid signature")
+func SignatureFromBytes(b []byte) (*Signature, error) {
+	if len(b) != 64 {
+		return nil, errors.New("Invalid signature")
 	}
-	rBytes := sig[:32]
-	sBytes := sig[32:]
+	rBytes := b[:32]
+	sBytes := b[32:]
 
 	r := new(big.Int).SetBytes(rBytes)
 	s := new(big.Int).SetBytes(sBytes)
 
-	return r, s, nil
+	sig := &Signature{
+		R: r,
+		S: s,
+	}
+	return sig, nil
 }
 
-func Sign(privK *ecdsa.PrivateKey, m []byte) ([]byte, error) {
+type Signature struct {
+	R *big.Int
+	S *big.Int
+}
+
+func Sign(privK *ecdsa.PrivateKey, m []byte) (*Signature, error) {
 	r := big.NewInt(0)
 	s := big.NewInt(0)
 
@@ -72,23 +81,20 @@ func Sign(privK *ecdsa.PrivateKey, m []byte) ([]byte, error) {
 
 	r, s, err := ecdsa.Sign(rand.Reader, privK, hashMsg[:])
 	if err != nil {
-		return []byte{}, err
+		return nil, err
+	}
+	sig := &Signature{
+		R: r,
+		S: s,
 	}
-
-	sig := PackSignature(r, s)
 
 	return sig, nil
 
 }
 
-func VerifySignature(pubK *ecdsa.PublicKey, m []byte, sig []byte) bool {
+func VerifySignature(pubK *ecdsa.PublicKey, m []byte, sig Signature) bool {
 	hashMsg := HashBytes(m)
 
-	r, s, err := UnpackSignature(sig)
-	if err != nil {
-		return false
-	}
-
-	verified := ecdsa.Verify(pubK, hashMsg[:], r, s)
+	verified := ecdsa.Verify(pubK, hashMsg[:], sig.R, sig.S)
 	return verified
 }

core/keys_test.go

@@ -29,6 +29,6 @@ func TestSignAndVerify(t *testing.T) {
 	assert.Nil(t, err)
 
 	// Verify
-	verified := VerifySignature(&privK.PublicKey, m, sig)
+	verified := VerifySignature(&privK.PublicKey, m, *sig)
 	assert.True(t, verified)
 }

go.mod

@@ -0,0 +1,8 @@
+module github.com/arnaucube/slowlorisdb
+
+go 1.12
+
+require (
+	github.com/stretchr/testify v1.3.0
+	github.com/syndtr/goleveldb v1.0.0
+)

go.sum

@@ -0,0 +1,25 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db h1:woRePGFeVFfLKN/pOkfl+p/TAqKOfFu+7KPlMVpok/w=
+github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
+github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
+github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
+github.com/onsi/ginkgo v1.7.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
+github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/syndtr/goleveldb v1.0.0 h1:fBdIW9lB4Iz0n9khmH8w27SJ3QEJ7+IgjPEwGSZiFdE=
+github.com/syndtr/goleveldb v1.0.0/go.mod h1:ZVVdQEZoIme9iO1Ch2Jdy24qqXrMMOU6lpPAyBWyWuQ=
+golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

node/node.go

@@ -0,0 +1,35 @@
+package node
+
+import (
+	"crypto/ecdsa"
+
+	"github.com/arnaucube/slowlorisdb/core"
+	"github.com/arnaucube/slowlorisdb/db"
+)
+
+type Node struct {
+	PrivK *ecdsa.PrivateKey
+	Addr  core.Address
+	Bc    *core.Blockchain
+}
+
+func NewNode(db *db.Db) (*Node, error) {
+	privK, err := core.NewKey()
+	if err != nil {
+		return nil, err
+	}
+	addr := core.AddressFromPrivK(privK)
+
+	bc := core.NewBlockchain(db)
+
+	node := &Node{
+		PrivK: privK,
+		Addr:  addr,
+		Bc:    bc,
+	}
+	return node, nil
+}
+
+func (node *Node) Sign(m []byte) (*core.Signature, error) {
+	return core.Sign(node.PrivK, m)
+}

node/node_test.go

@@ -0,0 +1,38 @@
+package node
+
+import (
+	"io/ioutil"
+	"testing"
+
+	"github.com/arnaucube/slowlorisdb/core"
+	"github.com/arnaucube/slowlorisdb/db"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNode(t *testing.T) {
+	dir, err := ioutil.TempDir("", "db")
+	assert.Nil(t, err)
+	db, err := db.New(dir)
+	assert.Nil(t, err)
+
+	node, err := NewNode(db)
+	assert.Nil(t, err)
+
+	assert.Equal(t, node.Addr, core.AddressFromPrivK(node.PrivK))
+}
+
+func TestNodeSignature(t *testing.T) {
+	dir, err := ioutil.TempDir("", "db")
+	assert.Nil(t, err)
+	db, err := db.New(dir)
+	assert.Nil(t, err)
+
+	node, err := NewNode(db)
+	assert.Nil(t, err)
+
+	m := []byte("test")
+	sig, err := node.Sign(m)
+	assert.Nil(t, err)
+	pubK := node.PrivK.PublicKey
+	assert.True(t, core.VerifySignature(&pubK, m, *sig))
+}