You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
112 lines
3.0 KiB
112 lines
3.0 KiB
package p2p
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/hex"
|
|
"fmt"
|
|
"io/ioutil"
|
|
|
|
crypto "github.com/tendermint/go-crypto"
|
|
cmn "github.com/tendermint/tmlibs/common"
|
|
)
|
|
|
|
// ID is a hex-encoded crypto.Address
|
|
type ID string
|
|
|
|
// IDByteLength is the length of a crypto.Address. Currently only 20.
|
|
// TODO: support other length addresses ?
|
|
const IDByteLength = 20
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Persistent peer ID
|
|
// TODO: encrypt on disk
|
|
|
|
// NodeKey is the persistent peer key.
|
|
// It contains the nodes private key for authentication.
|
|
type NodeKey struct {
|
|
PrivKey crypto.PrivKey `json:"priv_key"` // our priv key
|
|
}
|
|
|
|
// ID returns the peer's canonical ID - the hash of its public key.
|
|
func (nodeKey *NodeKey) ID() ID {
|
|
return PubKeyToID(nodeKey.PubKey())
|
|
}
|
|
|
|
// PubKey returns the peer's PubKey
|
|
func (nodeKey *NodeKey) PubKey() crypto.PubKey {
|
|
return nodeKey.PrivKey.PubKey()
|
|
}
|
|
|
|
// PubKeyToID returns the ID corresponding to the given PubKey.
|
|
// It's the hex-encoding of the pubKey.Address().
|
|
func PubKeyToID(pubKey crypto.PubKey) ID {
|
|
return ID(hex.EncodeToString(pubKey.Address()))
|
|
}
|
|
|
|
// LoadOrGenNodeKey attempts to load the NodeKey from the given filePath.
|
|
// If the file does not exist, it generates and saves a new NodeKey.
|
|
func LoadOrGenNodeKey(filePath string) (*NodeKey, error) {
|
|
if cmn.FileExists(filePath) {
|
|
nodeKey, err := loadNodeKey(filePath)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return nodeKey, nil
|
|
} else {
|
|
return genNodeKey(filePath)
|
|
}
|
|
}
|
|
|
|
func loadNodeKey(filePath string) (*NodeKey, error) {
|
|
jsonBytes, err := ioutil.ReadFile(filePath)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
nodeKey := new(NodeKey)
|
|
err = cdc.UnmarshalJSON(jsonBytes, nodeKey)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("Error reading NodeKey from %v: %v\n", filePath, err)
|
|
}
|
|
return nodeKey, nil
|
|
}
|
|
|
|
func genNodeKey(filePath string) (*NodeKey, error) {
|
|
privKey := crypto.GenPrivKeyEd25519()
|
|
nodeKey := &NodeKey{
|
|
PrivKey: privKey,
|
|
}
|
|
|
|
jsonBytes, err := cdc.MarshalJSON(nodeKey)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
err = ioutil.WriteFile(filePath, jsonBytes, 0600)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return nodeKey, nil
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
// MakePoWTarget returns the big-endian encoding of 2^(targetBits - difficulty) - 1.
|
|
// It can be used as a Proof of Work target.
|
|
// NOTE: targetBits must be a multiple of 8 and difficulty must be less than targetBits.
|
|
func MakePoWTarget(difficulty, targetBits uint) []byte {
|
|
if targetBits%8 != 0 {
|
|
panic(fmt.Sprintf("targetBits (%d) not a multiple of 8", targetBits))
|
|
}
|
|
if difficulty >= targetBits {
|
|
panic(fmt.Sprintf("difficulty (%d) >= targetBits (%d)", difficulty, targetBits))
|
|
}
|
|
targetBytes := targetBits / 8
|
|
zeroPrefixLen := (int(difficulty) / 8)
|
|
prefix := bytes.Repeat([]byte{0}, zeroPrefixLen)
|
|
mod := (difficulty % 8)
|
|
if mod > 0 {
|
|
nonZeroPrefix := byte(1<<(8-mod) - 1)
|
|
prefix = append(prefix, nonZeroPrefix)
|
|
}
|
|
tailLen := int(targetBytes) - len(prefix)
|
|
return append(prefix, bytes.Repeat([]byte{0xFF}, tailLen)...)
|
|
}
|