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meter-devkit

v1.1.1

Published

Typescript library to aid DApp development on VeChain Thor

Downloads

14

Readme

Thor DevKit

Typescript library to aid DApp development on VeChain Thor

Gitter

NPM Version Build Status Coverage Status

Installation

npm i --save thor-devkit

Usage

import all components or some of them

import {
    cry,
    abi,
    RLP,
    Transaction,
    Certificate,
    Bloom
} from 'thor-devkit'

Crypto methods

they are under cry namespace

Hashing

let hash = cry.blake2b256('hello world')
console.log(hash.toString('hex'))
// 256c83b297114d201b30179f3f0ef0cace9783622da5974326b436178aeef610

hash = cry.keccak256('hello world')
console.log(hash.toString('hex'))
// 47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad

Secp256k1

let privKey = cry.secp256k1.generatePrivateKey()
let pubKey = cry.secp256k1.derivePublicKey(privKey)
let addr = cry.publicKeyToAddress(pubKey)
let signature = cry.secp256k1.sign(cry.keccak256('hello world'), privKey)
let recoveredPubKey = cry.secp256k1.recover(cry.keccak256('hello world'), signature)

Mnemonic & Keystore

// generate BIP39 mnemonic words, default to 12 words(128bit strength)
let words = cry.mnemonic.generate()

// derive private key from mnemonic words according to BIP32, using the path `m/44'/818'/0'/0`.
// defined for VET at https://github.com/satoshilabs/slips/blob/master/slip-0044.md
let privateKey = cry.mnemonic.derivePrivateKey(words)

// in recovery process, validation is recommended
let ok = cry.mnemonic.validate(words)

// encrypt/decrypt private key using Ethereum's keystore scheme
let keystore = await cry.Keystore.encrypt(privateKey, 'your password')

// throw for wrong password
let recoveredPrivateKey = await cry.Keystore.decrypt(keystore, 'your password')

// roughly check keystore format
ok = cry.Keystore.wellFormed(keystore)

RLP

// define the profile for tx clause structure
let profile: RLP.Profile = {
    name: 'clause',
    kind: [
        { name: 'to', kind: new RLP.NullableFixedBlobKind(20) },
        { name: 'value', kind: new RLP.NumericKind(32) },
        { name: 'data', kind: new RLP.BlobKind() }
    ]
}

let clause = {
    to: '0x7567d83b7b8d80addcb281a71d54fc7b3364ffed',
    value: 10,
    data: '0x'
}

let rlp = new RLP(profile)

let data = rlp.encode(clause)
console.log(data.toString('hex'))
// d7947567d83b7b8d80addcb281a71d54fc7b3364ffed0a80

let obj = rlp.decode(data)
// `obj` should be identical to `clause`

Transaction

let clauses =  [{
    to: '0x7567d83b7b8d80addcb281a71d54fc7b3364ffed',
    value: 10000,
    data: '0x'
}]

// calc intrinsic gas
let gas = Transaction.intrinsicGas(clauses)
console.log(gas)
// 21000

let body: Transaction.Body = {
    chainTag: 0x9a,
    blockRef: '0x0000000000000000',
    expiration: 32,
    clauses: clauses,
    gasPriceCoef: 128,
    gas: 21000,
    dependsOn: null,
    nonce: 12345678
}

let tx = new Transaction(body)
let signingHash = cry.blake2b256(tx.encode())
tx.signature = cry.secp256k1.sign(signingHash, /* your private key */)

let raw = tx.encode()
let decoded = Transaction.decode(raw)

Certificate

supports client side self-signed certificate

let cert: Certificate = {
    purpose: 'identification',
    payload: {
        type: 'text',
        content: 'fyi'
    },
    domain: 'localhost',
    timestamp: 1545035330,
    signer: <<<signer-address>>>
}

let jsonStr = Certificate.encode(cert)
let signature = secp256k1.sign(cry.blake2b256(jsonStr), <<<private-key>>>)

cert.signature = '0x' + signature.toString('hex')

Certificate.verify(cert)

// certificate id
let id = '0x' + cry.blake2b256(Certificate.encode(cert)).toString('hex')

ABI

let fn = new abi.Function({
    "constant": false,
    "inputs": [
        {
            "name": "a1",
            "type": "uint256"
        },
        {
            "name": "a2",
            "type": "string"
        }
    ],
    "name": "f1",
    "outputs": [
        {
            "name": "r1",
            "type": "address"
        },
        {
            "name": "r2",
            "type": "bytes"
        }
    ],
    "payable": false,
    "stateMutability": "nonpayable",
    "type": "function"
})

let data = fn.encode(1, 'foo')

License

thor-devkit is licensed under the GNU Lesser General Public License v3.0, also included in LICENSE file in repository.