From: Ian Coleman Date: Thu, 12 Sep 2019 05:29:10 +0000 (+1000) Subject: Add ethereumjs-util to libs directory X-Git-Url: https://git.immae.eu/?p=perso%2FImmae%2FProjets%2FCryptomonnaies%2FBIP39.git;a=commitdiff_plain;h=dedb054fd81ca42aec2ed8caf20ba999ef1c4b44 Add ethereumjs-util to libs directory --- diff --git a/libs/ethereumjs-util/index.js b/libs/ethereumjs-util/index.js new file mode 100644 index 0000000..b17b7ae --- /dev/null +++ b/libs/ethereumjs-util/index.js @@ -0,0 +1,736 @@ +const createKeccakHash = require('keccak') +const secp256k1 = require('secp256k1') +const assert = require('assert') +const rlp = require('rlp') +const BN = require('bn.js') +const createHash = require('create-hash') +const Buffer = require('safe-buffer').Buffer +Object.assign(exports, require('ethjs-util')) + +/** + * the max integer that this VM can handle (a ```BN```) + * @var {BN} MAX_INTEGER + */ +exports.MAX_INTEGER = new BN('ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', 16) + +/** + * 2^256 (a ```BN```) + * @var {BN} TWO_POW256 + */ +exports.TWO_POW256 = new BN('10000000000000000000000000000000000000000000000000000000000000000', 16) + +/** + * Keccak-256 hash of null (a ```String```) + * @var {String} KECCAK256_NULL_S + */ +exports.KECCAK256_NULL_S = 'c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470' + +/** + * Keccak-256 hash of null (a ```Buffer```) + * @var {Buffer} KECCAK256_NULL + */ +exports.KECCAK256_NULL = Buffer.from(exports.KECCAK256_NULL_S, 'hex') + +/** + * Keccak-256 of an RLP of an empty array (a ```String```) + * @var {String} KECCAK256_RLP_ARRAY_S + */ +exports.KECCAK256_RLP_ARRAY_S = '1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347' + +/** + * Keccak-256 of an RLP of an empty array (a ```Buffer```) + * @var {Buffer} KECCAK256_RLP_ARRAY + */ +exports.KECCAK256_RLP_ARRAY = Buffer.from(exports.KECCAK256_RLP_ARRAY_S, 'hex') + +/** + * Keccak-256 hash of the RLP of null (a ```String```) + * @var {String} KECCAK256_RLP_S + */ +exports.KECCAK256_RLP_S = '56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421' + +/** + * Keccak-256 hash of the RLP of null (a ```Buffer```) + * @var {Buffer} KECCAK256_RLP + */ +exports.KECCAK256_RLP = Buffer.from(exports.KECCAK256_RLP_S, 'hex') + +/** + * [`BN`](https://github.com/indutny/bn.js) + * @var {Function} + */ +exports.BN = BN + +/** + * [`rlp`](https://github.com/ethereumjs/rlp) + * @var {Function} + */ +exports.rlp = rlp + +/** + * [`secp256k1`](https://github.com/cryptocoinjs/secp256k1-node/) + * @var {Object} + */ +exports.secp256k1 = secp256k1 + +/** + * Returns a buffer filled with 0s + * @method zeros + * @param {Number} bytes the number of bytes the buffer should be + * @return {Buffer} + */ +exports.zeros = function (bytes) { + return Buffer.allocUnsafe(bytes).fill(0) +} + +/** + * Returns a zero address + * @method zeroAddress + * @return {String} + */ +exports.zeroAddress = function () { + const addressLength = 20 + const zeroAddress = exports.zeros(addressLength) + return exports.bufferToHex(zeroAddress) +} + +/** + * Left Pads an `Array` or `Buffer` with leading zeros till it has `length` bytes. + * Or it truncates the beginning if it exceeds. + * @method lsetLength + * @param {Buffer|Array} msg the value to pad + * @param {Number} length the number of bytes the output should be + * @param {Boolean} [right=false] whether to start padding form the left or right + * @return {Buffer|Array} + */ +exports.setLengthLeft = exports.setLength = function (msg, length, right) { + const buf = exports.zeros(length) + msg = exports.toBuffer(msg) + if (right) { + if (msg.length < length) { + msg.copy(buf) + return buf + } + return msg.slice(0, length) + } else { + if (msg.length < length) { + msg.copy(buf, length - msg.length) + return buf + } + return msg.slice(-length) + } +} + +/** + * Right Pads an `Array` or `Buffer` with leading zeros till it has `length` bytes. + * Or it truncates the beginning if it exceeds. + * @param {Buffer|Array} msg the value to pad + * @param {Number} length the number of bytes the output should be + * @return {Buffer|Array} + */ +exports.setLengthRight = function (msg, length) { + return exports.setLength(msg, length, true) +} + +/** + * Trims leading zeros from a `Buffer` or an `Array` + * @param {Buffer|Array|String} a + * @return {Buffer|Array|String} + */ +exports.unpad = exports.stripZeros = function (a) { + a = exports.stripHexPrefix(a) + let first = a[0] + while (a.length > 0 && first.toString() === '0') { + a = a.slice(1) + first = a[0] + } + return a +} +/** + * Attempts to turn a value into a `Buffer`. As input it supports `Buffer`, `String`, `Number`, null/undefined, `BN` and other objects with a `toArray()` method. + * @param {*} v the value + */ +exports.toBuffer = function (v) { + if (!Buffer.isBuffer(v)) { + if (Array.isArray(v)) { + v = Buffer.from(v) + } else if (typeof v === 'string') { + if (exports.isHexString(v)) { + v = Buffer.from(exports.padToEven(exports.stripHexPrefix(v)), 'hex') + } else { + v = Buffer.from(v) + } + } else if (typeof v === 'number') { + v = exports.intToBuffer(v) + } else if (v === null || v === undefined) { + v = Buffer.allocUnsafe(0) + } else if (BN.isBN(v)) { + v = v.toArrayLike(Buffer) + } else if (v.toArray) { + // converts a BN to a Buffer + v = Buffer.from(v.toArray()) + } else { + throw new Error('invalid type') + } + } + return v +} + +/** + * Converts a `Buffer` to a `Number` + * @param {Buffer} buf + * @return {Number} + * @throws If the input number exceeds 53 bits. + */ +exports.bufferToInt = function (buf) { + return new BN(exports.toBuffer(buf)).toNumber() +} + +/** + * Converts a `Buffer` into a hex `String` + * @param {Buffer} buf + * @return {String} + */ +exports.bufferToHex = function (buf) { + buf = exports.toBuffer(buf) + return '0x' + buf.toString('hex') +} + +/** + * Interprets a `Buffer` as a signed integer and returns a `BN`. Assumes 256-bit numbers. + * @param {Buffer} num + * @return {BN} + */ +exports.fromSigned = function (num) { + return new BN(num).fromTwos(256) +} + +/** + * Converts a `BN` to an unsigned integer and returns it as a `Buffer`. Assumes 256-bit numbers. + * @param {BN} num + * @return {Buffer} + */ +exports.toUnsigned = function (num) { + return Buffer.from(num.toTwos(256).toArray()) +} + +/** + * Creates Keccak hash of the input + * @param {Buffer|Array|String|Number} a the input data + * @param {Number} [bits=256] the Keccak width + * @return {Buffer} + */ +exports.keccak = function (a, bits) { + a = exports.toBuffer(a) + if (!bits) bits = 256 + + return createKeccakHash('keccak' + bits).update(a).digest() +} + +/** + * Creates Keccak-256 hash of the input, alias for keccak(a, 256) + * @param {Buffer|Array|String|Number} a the input data + * @return {Buffer} + */ +exports.keccak256 = function (a) { + return exports.keccak(a) +} + +/** + * Creates SHA256 hash of the input + * @param {Buffer|Array|String|Number} a the input data + * @return {Buffer} + */ +exports.sha256 = function (a) { + a = exports.toBuffer(a) + return createHash('sha256').update(a).digest() +} + +/** + * Creates RIPEMD160 hash of the input + * @param {Buffer|Array|String|Number} a the input data + * @param {Boolean} padded whether it should be padded to 256 bits or not + * @return {Buffer} + */ +exports.ripemd160 = function (a, padded) { + a = exports.toBuffer(a) + const hash = createHash('rmd160').update(a).digest() + if (padded === true) { + return exports.setLength(hash, 32) + } else { + return hash + } +} + +/** + * Creates SHA-3 hash of the RLP encoded version of the input + * @param {Buffer|Array|String|Number} a the input data + * @return {Buffer} + */ +exports.rlphash = function (a) { + return exports.keccak(rlp.encode(a)) +} + +/** + * Checks if the private key satisfies the rules of the curve secp256k1. + * @param {Buffer} privateKey + * @return {Boolean} + */ +exports.isValidPrivate = function (privateKey) { + return secp256k1.privateKeyVerify(privateKey) +} + +/** + * Checks if the public key satisfies the rules of the curve secp256k1 + * and the requirements of Ethereum. + * @param {Buffer} publicKey The two points of an uncompressed key, unless sanitize is enabled + * @param {Boolean} [sanitize=false] Accept public keys in other formats + * @return {Boolean} + */ +exports.isValidPublic = function (publicKey, sanitize) { + if (publicKey.length === 64) { + // Convert to SEC1 for secp256k1 + return secp256k1.publicKeyVerify(Buffer.concat([ Buffer.from([4]), publicKey ])) + } + + if (!sanitize) { + return false + } + + return secp256k1.publicKeyVerify(publicKey) +} + +/** + * Returns the ethereum address of a given public key. + * Accepts "Ethereum public keys" and SEC1 encoded keys. + * @param {Buffer} pubKey The two points of an uncompressed key, unless sanitize is enabled + * @param {Boolean} [sanitize=false] Accept public keys in other formats + * @return {Buffer} + */ +exports.pubToAddress = exports.publicToAddress = function (pubKey, sanitize) { + pubKey = exports.toBuffer(pubKey) + if (sanitize && (pubKey.length !== 64)) { + pubKey = secp256k1.publicKeyConvert(pubKey, false).slice(1) + } + assert(pubKey.length === 64) + // Only take the lower 160bits of the hash + return exports.keccak(pubKey).slice(-20) +} + +/** + * Returns the ethereum public key of a given private key + * @param {Buffer} privateKey A private key must be 256 bits wide + * @return {Buffer} + */ +const privateToPublic = exports.privateToPublic = function (privateKey) { + privateKey = exports.toBuffer(privateKey) + // skip the type flag and use the X, Y points + return secp256k1.publicKeyCreate(privateKey, false).slice(1) +} + +/** + * Converts a public key to the Ethereum format. + * @param {Buffer} publicKey + * @return {Buffer} + */ +exports.importPublic = function (publicKey) { + publicKey = exports.toBuffer(publicKey) + if (publicKey.length !== 64) { + publicKey = secp256k1.publicKeyConvert(publicKey, false).slice(1) + } + return publicKey +} + +/** + * ECDSA sign + * @param {Buffer} msgHash + * @param {Buffer} privateKey + * @param {Number} [chainId] + * @return {Object} + */ +exports.ecsign = function (msgHash, privateKey, chainId) { + const sig = secp256k1.sign(msgHash, privateKey) + + const ret = {} + ret.r = sig.signature.slice(0, 32) + ret.s = sig.signature.slice(32, 64) + ret.v = chainId ? sig.recovery + (chainId * 2 + 35) : sig.recovery + 27 + return ret +} + +/** + * Returns the keccak-256 hash of `message`, prefixed with the header used by the `eth_sign` RPC call. + * The output of this function can be fed into `ecsign` to produce the same signature as the `eth_sign` + * call for a given `message`, or fed to `ecrecover` along with a signature to recover the public key + * used to produce the signature. + * @param message + * @returns {Buffer} hash + */ +exports.hashPersonalMessage = function (message) { + const prefix = exports.toBuffer('\u0019Ethereum Signed Message:\n' + message.length.toString()) + return exports.keccak(Buffer.concat([prefix, message])) +} + +/** + * ECDSA public key recovery from signature + * @param {Buffer} msgHash + * @param {Number} v + * @param {Buffer} r + * @param {Buffer} s + * @param {Number} [chainId] + * @return {Buffer} publicKey + */ +exports.ecrecover = function (msgHash, v, r, s, chainId) { + const signature = Buffer.concat([exports.setLength(r, 32), exports.setLength(s, 32)], 64) + const recovery = calculateSigRecovery(v, chainId) + if (!isValidSigRecovery(recovery)) { + throw new Error('Invalid signature v value') + } + const senderPubKey = secp256k1.recover(msgHash, signature, recovery) + return secp256k1.publicKeyConvert(senderPubKey, false).slice(1) +} + +/** + * Convert signature parameters into the format of `eth_sign` RPC method + * @param {Number} v + * @param {Buffer} r + * @param {Buffer} s + * @param {Number} [chainId] + * @return {String} sig + */ +exports.toRpcSig = function (v, r, s, chainId) { + let recovery = calculateSigRecovery(v, chainId) + if (!isValidSigRecovery(recovery)) { + throw new Error('Invalid signature v value') + } + + // geth (and the RPC eth_sign method) uses the 65 byte format used by Bitcoin + return exports.bufferToHex(Buffer.concat([ + exports.setLengthLeft(r, 32), + exports.setLengthLeft(s, 32), + exports.toBuffer(v) + ])) +} + +/** + * Convert signature format of the `eth_sign` RPC method to signature parameters + * NOTE: all because of a bug in geth: https://github.com/ethereum/go-ethereum/issues/2053 + * @param {String} sig + * @return {Object} + */ +exports.fromRpcSig = function (sig) { + sig = exports.toBuffer(sig) + + // NOTE: with potential introduction of chainId this might need to be updated + if (sig.length !== 65) { + throw new Error('Invalid signature length') + } + + let v = sig[64] + // support both versions of `eth_sign` responses + if (v < 27) { + v += 27 + } + + return { + v: v, + r: sig.slice(0, 32), + s: sig.slice(32, 64) + } +} + +/** + * Returns the ethereum address of a given private key + * @param {Buffer} privateKey A private key must be 256 bits wide + * @return {Buffer} + */ +exports.privateToAddress = function (privateKey) { + return exports.publicToAddress(privateToPublic(privateKey)) +} + +/** + * Checks if the address is a valid. Accepts checksummed addresses too + * @param {String} address + * @return {Boolean} + */ +exports.isValidAddress = function (address) { + return /^0x[0-9a-fA-F]{40}$/.test(address) +} + +/** + * Checks if a given address is a zero address + * @method isZeroAddress + * @param {String} address + * @return {Boolean} + */ +exports.isZeroAddress = function (address) { + const zeroAddress = exports.zeroAddress() + return zeroAddress === exports.addHexPrefix(address) +} + +/** + * Returns a checksummed address + * @param {String} address + * @return {String} + */ +exports.toChecksumAddress = function (address) { + address = exports.stripHexPrefix(address).toLowerCase() + const hash = exports.keccak(address).toString('hex') + let ret = '0x' + + for (let i = 0; i < address.length; i++) { + if (parseInt(hash[i], 16) >= 8) { + ret += address[i].toUpperCase() + } else { + ret += address[i] + } + } + + return ret +} + +/** + * Checks if the address is a valid checksummed address + * @param {Buffer} address + * @return {Boolean} + */ +exports.isValidChecksumAddress = function (address) { + return exports.isValidAddress(address) && (exports.toChecksumAddress(address) === address) +} + +/** + * Generates an address of a newly created contract + * @param {Buffer} from the address which is creating this new address + * @param {Buffer} nonce the nonce of the from account + * @return {Buffer} + */ +exports.generateAddress = function (from, nonce) { + from = exports.toBuffer(from) + nonce = new BN(nonce) + + if (nonce.isZero()) { + // in RLP we want to encode null in the case of zero nonce + // read the RLP documentation for an answer if you dare + nonce = null + } else { + nonce = Buffer.from(nonce.toArray()) + } + + // Only take the lower 160bits of the hash + return exports.rlphash([from, nonce]).slice(-20) +} + +/** + * Generates an address for a contract created using CREATE2 + * @param {Buffer} from the address which is creating this new address + * @param {Buffer} salt a salt + * @param {Buffer} initCode the init code of the contract being created + * @return {Buffer} + */ +exports.generateAddress2 = function (from, salt, initCode) { + from = exports.toBuffer(from) + salt = exports.toBuffer(salt) + initCode = exports.toBuffer(initCode) + + assert(from.length === 20) + assert(salt.length === 32) + + let address = exports.keccak256(Buffer.concat([ + Buffer.from('ff', 'hex'), + from, + salt, + exports.keccak256(initCode) + ])) + + return address.slice(-20) +} + +/** + * Returns true if the supplied address belongs to a precompiled account (Byzantium) + * @param {Buffer|String} address + * @return {Boolean} + */ +exports.isPrecompiled = function (address) { + const a = exports.unpad(address) + return a.length === 1 && a[0] >= 1 && a[0] <= 8 +} + +/** + * Adds "0x" to a given `String` if it does not already start with "0x" + * @param {String} str + * @return {String} + */ +exports.addHexPrefix = function (str) { + if (typeof str !== 'string') { + return str + } + + return exports.isHexPrefixed(str) ? str : '0x' + str +} + +/** + * Validate ECDSA signature + * @method isValidSignature + * @param {Buffer} v + * @param {Buffer} r + * @param {Buffer} s + * @param {Boolean} [homestead=true] + * @param {Number} [chainId] + * @return {Boolean} + */ + +exports.isValidSignature = function (v, r, s, homestead, chainId) { + const SECP256K1_N_DIV_2 = new BN('7fffffffffffffffffffffffffffffff5d576e7357a4501ddfe92f46681b20a0', 16) + const SECP256K1_N = new BN('fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141', 16) + + if (r.length !== 32 || s.length !== 32) { + return false + } + + if (!isValidSigRecovery(calculateSigRecovery(v, chainId))) { + return false + } + + r = new BN(r) + s = new BN(s) + + if (r.isZero() || r.gt(SECP256K1_N) || s.isZero() || s.gt(SECP256K1_N)) { + return false + } + + if ((homestead === false) && (new BN(s).cmp(SECP256K1_N_DIV_2) === 1)) { + return false + } + + return true +} + +/** + * Converts a `Buffer` or `Array` to JSON + * @param {Buffer|Array} ba + * @return {Array|String|null} + */ +exports.baToJSON = function (ba) { + if (Buffer.isBuffer(ba)) { + return '0x' + ba.toString('hex') + } else if (ba instanceof Array) { + const array = [] + for (let i = 0; i < ba.length; i++) { + array.push(exports.baToJSON(ba[i])) + } + return array + } +} + +/** + * Defines properties on a `Object`. It make the assumption that underlying data is binary. + * @param {Object} self the `Object` to define properties on + * @param {Array} fields an array fields to define. Fields can contain: + * * `name` - the name of the properties + * * `length` - the number of bytes the field can have + * * `allowLess` - if the field can be less than the length + * * `allowEmpty` + * @param {*} data data to be validated against the definitions + */ +exports.defineProperties = function (self, fields, data) { + self.raw = [] + self._fields = [] + + // attach the `toJSON` + self.toJSON = function (label) { + if (label) { + const obj = {} + self._fields.forEach((field) => { + obj[field] = '0x' + self[field].toString('hex') + }) + return obj + } + return exports.baToJSON(this.raw) + } + + self.serialize = function serialize () { + return rlp.encode(self.raw) + } + + fields.forEach((field, i) => { + self._fields.push(field.name) + function getter () { + return self.raw[i] + } + function setter (v) { + v = exports.toBuffer(v) + + if (v.toString('hex') === '00' && !field.allowZero) { + v = Buffer.allocUnsafe(0) + } + + if (field.allowLess && field.length) { + v = exports.stripZeros(v) + assert(field.length >= v.length, 'The field ' + field.name + ' must not have more ' + field.length + ' bytes') + } else if (!(field.allowZero && v.length === 0) && field.length) { + assert(field.length === v.length, 'The field ' + field.name + ' must have byte length of ' + field.length) + } + + self.raw[i] = v + } + + Object.defineProperty(self, field.name, { + enumerable: true, + configurable: true, + get: getter, + set: setter + }) + + if (field.default) { + self[field.name] = field.default + } + + // attach alias + if (field.alias) { + Object.defineProperty(self, field.alias, { + enumerable: false, + configurable: true, + set: setter, + get: getter + }) + } + }) + + // if the constuctor is passed data + if (data) { + if (typeof data === 'string') { + data = Buffer.from(exports.stripHexPrefix(data), 'hex') + } + + if (Buffer.isBuffer(data)) { + data = rlp.decode(data) + } + + if (Array.isArray(data)) { + if (data.length > self._fields.length) { + throw (new Error('wrong number of fields in data')) + } + + // make sure all the items are buffers + data.forEach((d, i) => { + self[self._fields[i]] = exports.toBuffer(d) + }) + } else if (typeof data === 'object') { + const keys = Object.keys(data) + fields.forEach((field) => { + if (keys.indexOf(field.name) !== -1) self[field.name] = data[field.name] + if (keys.indexOf(field.alias) !== -1) self[field.alias] = data[field.alias] + }) + } else { + throw new Error('invalid data') + } + } +} + +function calculateSigRecovery (v, chainId) { + return chainId ? v - (2 * chainId + 35) : v - 27 +} + +function isValidSigRecovery (recovery) { + return recovery === 0 || recovery === 1 +} diff --git a/libs/ethereumjs-util/package.json b/libs/ethereumjs-util/package.json new file mode 100644 index 0000000..a49746f --- /dev/null +++ b/libs/ethereumjs-util/package.json @@ -0,0 +1,125 @@ +{ + "name": "ethereumjs-util", + "version": "6.0.0", + "description": "a collection of utility functions for Ethereum", + "main": "dist/index.js", + "files": [ + "dist" + ], + "scripts": { + "build": "browserify index.js -s ethUtil -o /tmp/ethereumjs-util.js", + "coverage": "npm run build:dist && istanbul cover _mocha", + "coveralls": "npm run coverage && coveralls ./docs/index.md" + }, + "repository": { + "type": "git", + "url": "https://github.com/ethereumjs/ethereumjs-util.git" + }, + "keywords": [ + "ethereum", + "utilties" + ], + "author": "mjbecze ", + "contributors": [ + { + "name": "Tim Coulter", + "email": "tim@timothyjcoulter.com", + "url": "https://github.com/tcoulter", + "contributions": 1, + "additions": 2, + "deletions": 2 + }, + { + "name": "Nick Dodson", + "url": "https://github.com/SilentCicero", + "contributions": 2, + "additions": 26, + "deletions": 2 + }, + { + "name": "Mr. Chico", + "url": "https://github.com/MrChico", + "contributions": 1, + "additions": 11, + "deletions": 1 + }, + { + "name": "Dũng Trần", + "email": "tad88.dev@gmail.com", + "url": "https://github.com/tad88dev", + "contributions": 2, + "additions": 5, + "deletions": 5 + }, + { + "name": "Alex Beregszaszi", + "email": "alex@rtfs.hu", + "url": "https://github.com/axic", + "contributions": 77, + "additions": 1796, + "deletions": 642 + }, + { + "name": "Taylor Gerring", + "url": "https://github.com/tgerring", + "contributions": 1, + "additions": 1, + "deletions": 1 + }, + { + "name": "Kirill Fomichev", + "email": "fanatid@ya.ru", + "url": "https://github.com/fanatid", + "contributions": 8, + "additions": 32, + "deletions": 16 + }, + { + "name": "kumavis", + "email": "aaron@kumavis.me", + "url": "https://github.com/kumavis", + "contributions": 2, + "additions": 2, + "deletions": 2 + }, + { + "name": "Alexander Sinyagin", + "email": "sinyagin.alexander@gmail.com", + "url": "https://github.com/asinyagin", + "contributions": 1, + "additions": 3, + "deletions": 1 + } + ], + "license": "MPL-2.0", + "bugs": { + "url": "https://github.com/ethereumjs/ethereumjs-util/issues" + }, + "homepage": "https://github.com/ethereumjs/ethereumjs-util", + "dependencies": { + "bn.js": "^4.11.0", + "create-hash": "^1.1.2", + "ethjs-util": "^0.1.6", + "keccak": "^1.0.2", + "rlp": "^2.0.0", + "safe-buffer": "^5.1.1", + "secp256k1": "^3.0.1" + }, + "devDependencies": {}, + "standard": { + "globals": [ + "describe", + "it" + ], + "ignore": [ + "dist/**" + ] + } +} diff --git a/libs/ethereumjs-util/readme.md b/libs/ethereumjs-util/readme.md new file mode 100644 index 0000000..2cc717a --- /dev/null +++ b/libs/ethereumjs-util/readme.md @@ -0,0 +1,4 @@ +Build (will create a bundle and copy it to /tmp/ethereumjs-util.js): + + npm install + npm run build