// NewBlock creates a Block object from opaque data. It will hash the data.
func NewBlock(data []byte) (*Block, error) {
h, err := u.Hash(data)
if err != nil {
return nil, err
}
return &Block{Data: data, Multihash: h}, nil
}
// Multihash hashes the encoded data of this node.
func (n *Node) Multihash() (mh.Multihash, error) {
b, err := n.Encoded(false)
if err != nil {
return nil, err
}
return u.Hash(b)
}
// IDFromPubKey returns Nodes ID given its public key
func IDFromPubKey(pk ci.PubKey) (peer.ID, error) {
b, err := pk.Bytes()
if err != nil {
return nil, err
}
hash, err := u.Hash(b)
if err != nil {
return nil, err
}
return peer.ID(hash), nil
}
func TestBlocks(t *testing.T) {
d := ds.NewMapDatastore()
bs, err := NewBlockService(d, nil)
if err != nil {
t.Error("failed to construct block service", err)
return
}
b, err := blocks.NewBlock([]byte("beep boop"))
if err != nil {
t.Error("failed to construct block", err)
return
}
h, err := u.Hash([]byte("beep boop"))
if err != nil {
t.Error("failed to hash data", err)
return
}
if !bytes.Equal(b.Multihash, h) {
t.Error("Block Multihash and data multihash not equal")
}
if b.Key() != u.Key(h) {
t.Error("Block key and data multihash key not equal")
}
k, err := bs.AddBlock(b)
if err != nil {
t.Error("failed to add block to BlockService", err)
return
}
if k != b.Key() {
t.Error("returned key is not equal to block key", err)
}
b2, err := bs.GetBlock(b.Key())
if err != nil {
t.Error("failed to retrieve block from BlockService", err)
return
}
if b.Key() != b2.Key() {
t.Error("Block keys not equal.")
}
if !bytes.Equal(b.Data, b2.Data) {
t.Error("Block data is not equal.")
}
}
// Determines which algorithm to use. Note: f(a, b) = f(b, a)
func selectBest(myPrefs, theirPrefs string) (string, error) {
// Person with greatest hash gets first choice.
myHash, err := u.Hash([]byte(myPrefs))
if err != nil {
return "", err
}
theirHash, err := u.Hash([]byte(theirPrefs))
if err != nil {
return "", err
}
cmp := bytes.Compare(myHash, theirHash)
var firstChoiceArr, secChoiceArr []string
if cmp == -1 {
firstChoiceArr = strings.Split(theirPrefs, ",")
secChoiceArr = strings.Split(myPrefs, ",")
} else if cmp == 1 {
firstChoiceArr = strings.Split(myPrefs, ",")
secChoiceArr = strings.Split(theirPrefs, ",")
} else { // Exact same preferences.
myPrefsArr := strings.Split(myPrefs, ",")
return myPrefsArr[0], nil
}
for _, secChoice := range secChoiceArr {
for _, firstChoice := range firstChoiceArr {
if firstChoice == secChoice {
return firstChoice, nil
}
}
}
return "", errors.New("No algorithms in common!")
}
// GenIdentity creates a random keypair and returns the associated
// peerID and private key encoded to match config values
func GenIdentity() (string, string, error) {
k, pub, err := crypto.GenerateKeyPairWithReader(crypto.RSA, 512, u.NewTimeSeededRand())
if err != nil {
return "", "", err
}
b, err := k.Bytes()
if err != nil {
return "", "", err
}
privkey := b64.StdEncoding.EncodeToString(b)
pubkeyb, err := pub.Bytes()
if err != nil {
return "", "", err
}
id := b58.Encode(u.Hash(pubkeyb))
return id, privkey, nil
}
