区块链 - 创建钱包（以太坊）

2.创建钱包

1、生成助记词

1 import bip39 from 'react-native-bip39'
2    getMnemonic()=>{
3        bip39.generateMnemonic().then(function (mnemonic) {
4             alert(mnemonic)
5             getwallet(mnemonic)
6          }, function (err) {
7              //     alert(err)
8          })
9  }

2、生成Seed和钱包对象wallet

使用助记词计算出Seed，然后得到钱包

 1 import crypto from 'crypto'
 2 //HDKey
 3 var BITCOIN_VERSIONS = {private: 0x0488ADE4, public: 0x0488B21E}
 4 
 5 function HDKey (versions) {
 6   this.versions = versions || BITCOIN_VERSIONS
 7   this.depth = 0
 8   this.index = 0
 9   this._privateKey = null
10   this._publicKey = null
11   this.chainCode = null
12   this._fingerprint = 0
13   this.parentFingerprint = 0
14 }
15 HDKey.fromMasterSeed = function (seedBuffer, versions) {
16   var I = crypto.createHmac('sha512', MASTER_SECRET).update(seedBuffer).digest()
17   var IL = I.slice(0, 32)
18   var IR = I.slice(32)
19 
20   var hdkey = new HDKey(versions)
21   hdkey.chainCode = IR
22   hdkey.privateKey = IL
23 
24   return hdkey
25 }
26 //WalletHDKey
27 function EthereumHDKey () {
28 }
29 
30 function fromHDKey (hdkey) {
31   var ret = new EthereumHDKey()
32   ret._hdkey = hdkey
33   return ret
34 }
35 
36 EthereumHDKey.fromMasterSeed = function (seedBuffer) {
37   return fromHDKey(HDKey.fromMasterSeed(seedBuffer))
38 }
39 //获取钱包对象
40 getwallet = (mnemonic) => {
41         let index = 0
42         var masterSeed = bip39.mnemonicToSeed(mnemonic)
43         var wallet = wallethdkey.fromMasterSeed(masterSeed).derivePath("m/44'/60'/0'/0").deriveChild(index).getWallet()  
44     }

3、生成钱包地址和keystore文件

 1 1Wallet = function (priv,pub) {this._privKey = priv;this._pubKey = pub}Wallet.prototype.getV3Filename = function (timestamp) {
 2   var ts = timestamp ? new Date(timestamp) : new Date()
 3   return [
 4     'UTC--',
 5     ts.toJSON().replace(/:/g, '-'),
 6     '--',
 7     this.getAddress().toString('hex')
 8   ].join('')
 9 }
10 Wallet.prototype.getAddress = function () {
11   return ethUtil.publicToAddress(this.pubKey)
12 }
13 Wallet.prototype.toV3 = function (password, opts, callback) {
14   opts = opts || {}
15   var salt = opts.salt || crypto.randomBytes(32)
16   var iv = opts.iv || crypto.randomBytes(16)
17   var derivedKey
18   var kdf = opts.kdf || 'scrypt'
19   var kdfparams = {
20     dklen: opts.dklen || 32,
21     salt: salt.toString('hex')
22   }
23   if (kdf === 'pbkdf2') {
24     kdfparams.c = opts.c || 262144
25     kdfparams.prf = 'hmac-sha256'
26     derivedKey = crypto.pbkdf2Sync(Buffer.from(password), salt, kdfparams.c, kdfparams.dklen, 'sha256')
27   }
28   else {
29     throw new Error('Unsupported kdf')
30   }
31   
32     var ciphertext = Buffer.concat([ cipher.update(this.privKey), cipher.final() ])
33     
34     var mac = ethUtil.sha3(Buffer.concat([ derivedKey.slice(16, 32), Buffer.from(ciphertext, 'hex') ]))
35   
36     return {
37       version: 3,
38       id: uuid.v4({ random: opts.uuid || crypto.randomBytes(16) }),
39       address: this.getAddress().toString('hex'),
40       crypto: {
41         ciphertext: ciphertext.toString('hex'),
42         cipherparams: {
43           iv: iv.toString('hex')
44         },
45         cipher: opts.cipher || 'aes-128-ctr',
46         kdf: kdf,
47         kdfparams: kdfparams,
48         mac: mac.toString('hex')
49       }
50     }
51 
52 }
53 getAddressAndWallet=(wallet)=>{
54  var address = '0x' + wallet.getAddress().toString('hex')//获取钱包地址
55 //生成keystore文件
56         let timestamp = (new Date()).valueOf();
57        wallet.getV3Filename(timestamp);//named keystore file 
58         //输入支付宝密码，生成keystore文件
59         //从钱包获取keystore保存在手机的本地文件，防止手机卸载而丢失keystore文件
60         let keystore = wallet.toV3(password, { kdf: 'pbkdf2' });
61 }

4、获取交易私钥

1 Wallet.prototype.getPrivateKey = function () {
2   return this.privKey
3 }
4 Wallet.prototype.getPublicKey = function () {
5   return this.pubKey
6 }
7 var privatekey = wallet.getPrivateKey().toString('hex')//获取私钥
8 var getPublicKey = wallet.getPublicKey().toString('hex')