forked from ontio/ontology
/
identity.go
145 lines (129 loc) · 3.42 KB
/
identity.go
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/*
* Copyright (C) 2018 The ontology Authors
* This file is part of The ontology library.
*
* The ontology is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ontology is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with The ontology. If not, see <http://www.gnu.org/licenses/>.
*/
package account
import (
"bytes"
"crypto/rand"
"crypto/sha256"
"encoding/hex"
"fmt"
"math/big"
base58 "github.com/itchyny/base58-go"
"github.com/ontio/ontology-crypto/keypair"
"github.com/ontio/ontology/core/types"
"golang.org/x/crypto/ripemd160"
)
const (
SCHEME = "did"
METHOD = "ont"
VER = 0x41
)
func GenerateID() (string, error) {
var buf [32]byte
_, err := rand.Read(buf[:])
if err != nil {
return "", fmt.Errorf("generate ID error, %s", err)
}
return CreateID(buf[:])
}
func CreateID(nonce []byte) (string, error) {
hasher := ripemd160.New()
_, err := hasher.Write(nonce)
if err != nil {
return "", fmt.Errorf("create ID error, %s", err)
}
data := hasher.Sum([]byte{VER})
data = append(data, checksum(data)...)
bi := new(big.Int).SetBytes(data).String()
idstring, err := base58.BitcoinEncoding.Encode([]byte(bi))
if err != nil {
return "", fmt.Errorf("create ID error, %s", err)
}
return SCHEME + ":" + METHOD + ":" + string(idstring), nil
}
func VerifyID(id string) bool {
if len(id) < 9 {
return false
}
if id[0:8] != "did:ont:" {
return false
}
buf, err := base58.BitcoinEncoding.Decode([]byte(id[8:]))
if err != nil {
return false
}
bi, ok := new(big.Int).SetString(string(buf), 10)
if !ok || bi == nil {
return false
}
buf = bi.Bytes()
// 1 byte version + 20 byte hash + 4 byte checksum
if len(buf) != 25 {
return false
}
pos := len(buf) - 4
data := buf[:pos]
check := buf[pos:]
sum := checksum(data)
if !bytes.Equal(sum, check) {
return false
}
return true
}
func checksum(data []byte) []byte {
sum := sha256.Sum256(data)
sum = sha256.Sum256(sum[:])
return sum[:4]
}
type Identity struct {
ID string `json:"ontid"`
Label string `json:"label,omitempty"`
Lock bool `json:"lock"`
Control []Controller `json:"controls,omitempty"`
Extra interface{} `json:"extra,omitempty"`
}
type Controller struct {
ID string `json:"id"`
Public string `json:"publicKey,omitempty"`
keypair.ProtectedKey
}
func NewIdentity(label string, keyType keypair.KeyType, param interface{}, password []byte) (*Identity, error) {
id, err := GenerateID()
if err != nil {
return nil, err
}
pri, pub, err := keypair.GenerateKeyPair(keyType, param)
if err != nil {
return nil, err
}
addr := types.AddressFromPubKey(pub)
b58addr := addr.ToBase58()
prot, err := keypair.EncryptPrivateKey(pri, b58addr, password)
if err != nil {
return nil, err
}
var res Identity
res.ID = id
res.Label = label
res.Lock = false
res.Control = make([]Controller, 1)
res.Control[0].ID = "1"
res.Control[0].ProtectedKey = *prot
res.Control[0].Public = hex.EncodeToString(keypair.SerializePublicKey(pub))
return &res, nil
}